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ldapjs Client API

This document covers the ldapjs client API and assumes that you are familiar with LDAP. If you're not, read the guide first.

Create a client

The code to create a new client looks like:

<code class="language-js"><span class="hljs-keyword">const</span> ldap = <span class="hljs-built_in">require</span>(<span class="hljs-string">'ldapjs'</span>);

<span class="hljs-keyword">const</span> client = ldap.createClient({ <span class="hljs-attr">url</span>: [<span class="hljs-string">'ldap://ldap.namapi.org:389'</span>, <span class="hljs-string">'ldaps://ldap.namapi.org:636'</span>] });

client.on(<span class="hljs-string">'error'</span>, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> { <span class="hljs-comment">// handle connection error</span> })

You can use ldap:// or ldaps://

; the latter would connect over SSL (note that this will not use the LDAP TLS extended operation, but literally an SSL connection to port 636, as in LDAP v2). The full set of options to create a client is:

Attribute Description
url A string or array of valid LDAP URL(s) (proto/host/port)
socketPath Socket path if using AF_UNIX sockets
log A compatible logger instance (Default: no-op logger)
timeout Milliseconds client should let operations live for before timing out (Default: Infinity)
connectTimeout Milliseconds client should wait before timing out on TCP connections (Default: OS default)
tlsOptions Additional options passed to TLS connection layer when connecting via ldaps://

(See: The TLS docs for node.js)

idleTimeoutMilliseconds after last activity before client emits idle event
strictDNForce strict DN parsing for client methods (Default is true)
reconnectTry to reconnect when the connection gets lost (Default is false)

url

This parameter takes a single connection string or an array of connection strings as an input. In case an array is provided, the client tries to connect to the servers in given order. To achieve random server strategy (e.g. to distribute the load among the servers), please shuffle the array before passing it as an argument.

Note On Logger

A passed in logger is expected to conform to the Bunyan API. Specifically, the logger is expected to have a child()

method. If a logger is supplied that does not have such a method, then a shim version is added that merely returns the passed in logger.

Known compatible loggers are:

Connection management

As LDAP is a stateful protocol (as opposed to HTTP), having connections torn down from underneath you can be difficult to deal with. Several mechanisms have been provided to mitigate this trouble.

Reconnect

You can provide a Boolean option indicating if a reconnect should be tried. For more sophisticated control, you can provide an Object with the properties initialDelay (default: 100), maxDelay (default: 10000) and failAfter (default: Infinity

). After the reconnect you maybe need to bind again.

Client events

The client is an EventEmitter

and can emit the following events:

Event Description
error General error
connectRefused Server refused connection. Most likely bad authentication
connectTimeout Server timeout
connectError Socket connection error
setupError Setup error after successful connection
socketTimeout Socket timeout
resultError Search result error
timeout Search result timeout
destroy After client is disconnected
end Socket end event
close Socket closed
connect Client connected
idle Idle timeout reached

Common patterns

The last two parameters in every API are controls and callback. controls can be either a single instance of a Control or an array of Control

objects. You can, and probably will, omit this option.

Almost every operation has the callback form of function(err, res) where err will be an instance of an LDAPError (you can use instanceof to switch). You probably won't need to check the res

parameter, but it's there if you do.

bind

bind(dn, password, controls, callback)

Performs a bind operation against the LDAP server.

The bind API only allows LDAP 'simple' binds (equivalent to HTTP Basic Authentication) for now. Note that all client APIs can optionally take an array of Control

objects. You probably don't need them though...

Example:

<code class="language-js">client.bind(<span class="hljs-string">'cn=root'</span>, <span class="hljs-string">'secret'</span>, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});

add

add(dn, entry, controls, callback)

Performs an add operation against the LDAP server.

Allows you to add an entry (which is just a plain JS object), and as always, controls are optional.

Example:

<code class="language-js"><span class="hljs-keyword">const</span> entry = {
  <span class="hljs-attr">cn</span>: <span class="hljs-string">'foo'</span>,
  <span class="hljs-attr">sn</span>: <span class="hljs-string">'bar'</span>,
  <span class="hljs-attr">email</span>: [<span class="hljs-string">'info@namapi.org'</span>, <span class="hljs-string">'info@namapi.org'</span>],
  <span class="hljs-attr">objectclass</span>: <span class="hljs-string">'fooPerson'</span>
};
client.add(<span class="hljs-string">'cn=foo, dc=example,dc=e'</span>, entry, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});

compare

compare(dn, attribute, value, controls, callback)

Performs an LDAP compare operation with the given attribute and value against the entry referenced by dn.

Example:

<code class="language-js">client.compare(<span class="hljs-string">'cn=foo, dc=example',dc=e</span>, <span class="hljs-string">'sn'</span>, <span class="hljs-string">'bar'</span>, <span class="hljs-function">(<span class="hljs-params">err, matched</span>) =></span> {
  assert.ifError(err);<p>  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'matched: '</span> + matched);
});
</p>

del

del(dn, controls, callback)

Deletes an entry from the LDAP server.

Example:

<code class="language-js">client.del(<span class="hljs-string">'cn=foo, dc=example.e'</span>, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});

exop

exop(name, value, controls, callback)

Performs an LDAP extended operation against an LDAP server. name is typically going to be an OID (well, the RFC says it must be; however, ldapjs has no such restriction). value

is completely arbitrary, and is whatever the exop says it should be.

Example (performs an LDAP 'whois' extended op):

<code class="language-js">client.exop(<span class="hljs-string">'1.3.6.1.4.1.4203.1.11.3'</span>, <span class="hljs-function">(<span class="hljs-params">err, value, res</span>) =></span> {
  assert.ifError(err);<p>  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'whois: '</span> + value);
});
</p>

modify

modify(name, changes, controls, callback)

Performs an LDAP modify operation against the LDAP server. This API requires you to pass in a Change object, which is described below. Note that you can pass in a single Change or an array of Change

objects.

Example:

<code class="language-js"><span class="hljs-keyword">const</span> change = <span class="hljs-keyword">new</span> ldap.Change({
  <span class="hljs-attr">operation</span>: <span class="hljs-string">'add'</span>,
  <span class="hljs-attr">modification</span>: {
    <span class="hljs-attr">pets</span>: [<span class="hljs-string">'cat'</span>, <span class="hljs-string">'dog'</span>]
  }
});<p>client.modify(<span class="hljs-string">'cn=foo, o=example'</span>, change, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});
</p>

Change

A Change object maps to the LDAP protocol of a modify change, and requires you to set the operation and modification. The operation

is a string, and must be one of:

Operation Description
replace Replaces the attribute referenced in modification

. If the modification has no values, it is equivalent to a delete.

add Adds the attribute value(s) referenced in modification

. The attribute may or may not already exist.

delete Deletes the attribute (and all values) referenced in modification

.

modification

is just a plain old JS object with the values you want.

modifyDN

modifyDN(dn, newDN, controls, callback)

Performs an LDAP modifyDN (rename) operation against an entry in the LDAP server. A couple points with this client API:

  • There is no ability to set "keep old dn." It's always going to flag the old dn to be purged.
  • The client code will automatically figure out if the request is a "new superior" request ("new superior" means move to a different part of the tree, as opposed to just renaming the leaf).

Example:

<code class="language-js">client.modifyDN(<span class="hljs-string">'cn=foo, dc=example, dc=e'</span>, <span class="hljs-string">'cn=bar'</span>, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});

search

search(base, options, controls, callback)

Performs a search operation against the LDAP server.

The search operation is more complex than the other operations, so this one takes an options

object for all the parameters. However, ldapjs makes some defaults for you so that if you pass nothing in, it's pretty much equivalent to an HTTP GET operation (i.e., base search against the DN, filter set to always match).

Like every other operation, base

is a DN string.

Options can be a string representing a valid LDAP filter or an object containing the following fields:

Attribute Description
scope One of base, one, or sub. Defaults to base

.

filter A string version of an LDAP filter (see below), or a programatically constructed Filter object. Defaults to (objectclass=*)

.

attributesattributes to select and return (if these are set, the server will return only these attributes). Defaults to the empty set, which means all attributes. You can provide a string if you want a single attribute or an array of string for one or many.
attrsOnlyboolean on whether you want the server to only return the names of the attributes, and not their values. Borderline useless. Defaults to false.
sizeLimitthe maximum number of entries to return. Defaults to 0 (unlimited).
timeLimitthe maximum amount of time the server should take in responding, in seconds. Defaults to 10. Lots of servers will ignore this.
pagedenable and/or configure automatic result paging

Responses from the search method are an EventEmitter where you will get a notification for each searchEntry that comes back from the server. You will additionally be able to listen for a searchReference, error and end event. Note that the error event will only be for client/TCP errors, not LDAP error codes like the other APIs. You'll want to check the LDAP status code (likely for 0) on the end

event to assert success. LDAP search results can give you a lot of status codes, such as time or size exceeded, busy, inappropriate matching, etc., which is why this method doesn't try to wrap up the code matching.

Example:

<code class="language-js"><span class="hljs-keyword">const</span> opts = {
  <span class="hljs-attr">filter</span>: <span class="hljs-string">'(&(l=Seattle)(email=*@foo.com))'</span>,
  <span class="hljs-attr">scope</span>: <span class="hljs-string">'sub'</span>,
  <span class="hljs-attr">attributes</span>: [<span class="hljs-string">'dn'</span>, <span class="hljs-string">'sn'</span>, <span class="hljs-string">'cn'</span>]
};<p>client.search(<span class="hljs-string">'o=example'</span>, opts, <span class="hljs-function">(<span class="hljs-params">err, res</span>) =></span> {
  assert.ifError(err);</p><p>  res.on(<span class="hljs-string">'searchEntry'</span>, <span class="hljs-function">(<span class="hljs-params">entry</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'entry: '</span> + <span class="hljs-built_in">JSON</span>.stringify(entry.object));
  });
  res.on(<span class="hljs-string">'searchReference'</span>, <span class="hljs-function">(<span class="hljs-params">referral</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'referral: '</span> + referral.uris.join());
  });
  res.on(<span class="hljs-string">'error'</span>, <span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
    <span class="hljs-built_in">console</span>.error(<span class="hljs-string">'error: '</span> + err.message);
  });
  res.on(<span class="hljs-string">'end'</span>, <span class="hljs-function">(<span class="hljs-params">result</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'status: '</span> + result.status);
  });
});
</p>

Filter Strings

The easiest way to write search filters is to write them compliant with RFC2254, which is "The string representation of LDAP search filters." Note that ldapjs doesn't support extensible matching, since it's one of those features that almost nobody actually uses in practice.

Assuming you don't really want to read the RFC, search filters in LDAP are basically are a "tree" of attribute/value assertions, with the tree specified in prefix notation. For example, let's start simple, and build up a complicated filter. The most basic filter is equality, so let's assume you want to search for an attribute email with a value of foo@bar.com

. The syntax would be:

<code>(email=foo@bar.com)

ldapjs requires all filters to be surrounded by '()' blocks. Ok, that was easy. Let's now assume that you want to find all records where the email is actually just anything in the "@bar.com" domain and the location attribute is set to Seattle:

<code>(&(email=*@bar.com)(l=Seattle))

Now our filter is actually three LDAP filters. We have an and filter (single amp &), an equality filter (the l=Seattle), and a substring filter. Substrings are wildcard filters. They use * as the wildcard. You can put more than one wildcard for a given string. For example you could do (email=*@*bar.com) to match any email of @bar.com or its subdomains like "example@foo.bar.com"

.

Now, let's say we also want to set our filter to include a specification that either the employeeType not be a manager nor a secretary:

<code>(&(email=*@bar.com)(l=Seattle)(!(|(employeeType=manager)(employeeType=secretary))))

The not character is represented as a !, the or as a single pipe |

. It gets a little bit complicated, but it's actually quite powerful, and lets you find almost anything you're looking for.

Paging

Many LDAP server enforce size limits upon the returned result set (commonly 1000). In order to retrieve results beyond this limit, a PagedResultControl is passed between the client and server to iterate through the entire dataset. While callers could choose to do this manually via the controls parameter to search(), ldapjs has internal mechanisms to easily automate the process. The most simple way to use the paging automation is to set the paged

option to true when performing a search:

<code class="language-js"><span class="hljs-keyword">const</span> opts = {
  <span class="hljs-attr">filter</span>: <span class="hljs-string">'(objectclass=commonobject)'</span>,
  <span class="hljs-attr">scope</span>: <span class="hljs-string">'sub'</span>,
  <span class="hljs-attr">paged</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-attr">sizeLimit</span>: <span class="hljs-number">200</span>
};
client.search(<span class="hljs-string">'o=largedir'</span>, opts, <span class="hljs-function">(<span class="hljs-params">err, res</span>) =></span> {
  assert.ifError(err);
  res.on(<span class="hljs-string">'searchEntry'</span>, <span class="hljs-function">(<span class="hljs-params">entry</span>) =></span> {
    <span class="hljs-comment">// do per-entry processing</span>
  });
  res.on(<span class="hljs-string">'page'</span>, <span class="hljs-function">(<span class="hljs-params">result</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'page end'</span>);
  });
  res.on(<span class="hljs-string">'error'</span>, <span class="hljs-function">(<span class="hljs-params">resErr</span>) =></span> {
    assert.ifError(resErr);
  });
  res.on(<span class="hljs-string">'end'</span>, <span class="hljs-function">(<span class="hljs-params">result</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'done '</span>);
  });
});

This will enable paging with a default page size of 199 (sizeLimit - 1) and will output all of the resulting objects via the searchEntry event. At the end of each result during the operation, a page event will be emitted as well (which includes the intermediate searchResult

object).

For those wanting more precise control over the process, an object with several parameters can be provided for the paged option. The pageSize parameter sets the size of result pages requested from the server. If no value is specified, it will fall back to the default (100 or sizeLimit - 1, to obey the RFC). The pagePause parameter allows back-pressure to be exerted on the paged search operation by pausing at the end of each page. When enabled, a callback function is passed as an additional parameter to page

events. The client will wait to request the next page until that callback is executed.

Here is an example where both of those parameters are used:

<code class="language-js"><span class="hljs-keyword">const</span> queue = <span class="hljs-keyword">new</span> MyWorkQueue(someSlowWorkFunction);
<span class="hljs-keyword">const</span> opts = {
  <span class="hljs-attr">filter</span>: <span class="hljs-string">'(objectclass=commonobject)'</span>,
  <span class="hljs-attr">scope</span>: <span class="hljs-string">'sub'</span>,
  <span class="hljs-attr">paged</span>: {
    <span class="hljs-attr">pageSize</span>: <span class="hljs-number">250</span>,
    <span class="hljs-attr">pagePause</span>: <span class="hljs-literal">true</span>
  },
};
client.search(<span class="hljs-string">'o=largerdir'</span>, opts, <span class="hljs-function">(<span class="hljs-params">err, res</span>) =></span> {
  assert.ifError(err);
  res.on(<span class="hljs-string">'searchEntry'</span>, <span class="hljs-function">(<span class="hljs-params">entry</span>) =></span> {
    <span class="hljs-comment">// Submit incoming objects to queue</span>
    queue.push(entry);
  });
  res.on(<span class="hljs-string">'page'</span>, <span class="hljs-function">(<span class="hljs-params">result, cb</span>) =></span> {
    <span class="hljs-comment">// Allow the queue to flush before fetching next page</span>
    queue.cbWhenFlushed(cb);
  });
  res.on(<span class="hljs-string">'error'</span>, <span class="hljs-function">(<span class="hljs-params">resErr</span>) =></span> {
    assert.ifError(resErr);
  });
  res.on(<span class="hljs-string">'end'</span>, <span class="hljs-function">(<span class="hljs-params">result</span>) =></span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">'done'</span>);
  });
});

starttls

starttls(options, controls, callback)

Attempt to secure existing LDAP connection via STARTTLS.

Example:

<code class="language-js"><span class="hljs-keyword">const</span> opts = {
  <span class="hljs-attr">ca</span>: [fs.readFileSync(<span class="hljs-string">'mycacert.pem'</span>)]
};<p>client.starttls(opts, <span class="hljs-function">(<span class="hljs-params">err, res</span>) =></span> {
  assert.ifError(err);</p><p>  <span class="hljs-comment">// Client communication now TLS protected</span>
});
</p>

unbind

unbind(callback)

Performs an unbind operation against the LDAP server.

Note that unbind operation is not an opposite operation for bind. Unbinding results in disconnecting the client regardless of whether a bind operation was performed.

The callback

argument is optional as unbind does not have a response.

Example:

<code class="language-js">client.unbind(<span class="hljs-function">(<span class="hljs-params">err</span>) =></span> {
  assert.ifError(err);
});

Litegui is a javascript library to create webapps with a desktop look-alike user interface. All the widgets, panels, dialogs, etc are created from Javascript instead of HTML. The upside of this is that this helps to create more dynamic interfaces and gives a lot of flexibility. The downside is that you'll need to write some code to make it all work. If you're looking for a library that just needs some HTML and a couple of event handlers to work, litegui is not what you're looking for. On the other hand, any advanced UI will need a lot of coding and in creating advanced UI's litegui shines.

Creating a UI

So let's start with building something simple. This first introduction will show you how to create a menubar and add some items to it. Please note that the javascript is brief on purpose and doesn't reflect javascript best coding practices. The goal here is to get you up and running as fast as possible.

Start with the following index.html:

<span class="pl-c1"><!DOCTYPE html<span class="pl-kos">></span></span>
<span class="pl-kos"><</span><span class="pl-ent">html</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">head</span><span class="pl-kos">></span>
    <span class="pl-kos"><</span><span class="pl-ent">title</span><span class="pl-kos">></span>Algae<span class="pl-kos"></</span><span class="pl-ent">title</span><span class="pl-kos">></span>
    <span class="pl-kos"><</span><span class="pl-ent">link</span> <span class="pl-c1">type</span>="<span class="pl-s">text/css</span>" <span class="pl-c1">rel</span>="<span class="pl-s">stylesheet</span>" <span class="pl-c1">href</span>="<span class="pl-s">litegui.js/build/litegui.css</span>"<span class="pl-kos">></span>

<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">text/javascript</span>" <span class="pl-c1">src</span>="<span class="pl-s">litegui.js/external/jscolor/jscolor.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>

<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">application/javascript</span>" <span class="pl-c1">src</span>="<span class="pl-s">litegui.js/build/litegui.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos"></</span><span class="pl-ent">head</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">body</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">init.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos"></</span><span class="pl-ent">body</span><span class="pl-kos">></span> <span class="pl-kos"></</span><span class="pl-ent">html</span><span class="pl-kos">></span>

Add the following to init.js:

<span class="pl-c">// Initialize litegui.js</span>
<span class="pl-v">LiteGUI</span><span class="pl-kos">.</span><span class="pl-en">init</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Create a menu bar</span> <span class="pl-k">var</span> <span class="pl-s1">menu</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">LiteGUI</span><span class="pl-kos">.</span><span class="pl-c1">Menubar</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Add some items to it</span> <span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'File/New'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'File/Settings'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// This will be shown greyed out</span> <span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'File/I\'m not clickable'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">disabled</span>: <span class="pl-c1">true</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Add a second main menu item</span> <span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'Help/Help'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'Help/About'</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Add the menu bar to litegui</span> <span class="pl-v">LiteGUI</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">menu</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Now open index.html in your browser. You should see a menu bar on the top of the screen. That might be pretty nifty, but it's not yet doing anything usefull. Let's fix that by adding a settings dialog

Add the following code to init.js after the call to LiteGUI.init():

<span class="pl-k">function</span> <span class="pl-en">createSettingsDialog</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
    <span class="pl-c">// Create a new dialog</span>
    <span class="pl-k">var</span> <span class="pl-s1">dialog</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">LiteGUI</span><span class="pl-kos">.</span><span class="pl-c1">Dialog</span><span class="pl-kos">(</span><span class="pl-s">'Settings'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">title</span>:<span class="pl-s">'Settings'</span><span class="pl-kos">,</span> <span class="pl-c1">close</span>: <span class="pl-c1">true</span><span class="pl-kos">,</span> <span class="pl-c1">minimize</span>: <span class="pl-c1">false</span><span class="pl-kos">,</span> <span class="pl-c1">width</span>: <span class="pl-c1">300</span><span class="pl-kos">,</span> <span class="pl-c1">height</span>: <span class="pl-c1">500</span><span class="pl-kos">,</span> <span class="pl-c1">scroll</span>: <span class="pl-c1">false</span><span class="pl-kos">,</span> <span class="pl-c1">resizable</span>: <span class="pl-c1">false</span><span class="pl-kos">,</span> <span class="pl-c1">draggable</span>: <span class="pl-c1">true</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Create a collection of widgets</span> <span class="pl-k">var</span> <span class="pl-s1">widgets</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">LiteGUI</span><span class="pl-kos">.</span><span class="pl-c1">Inspector</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">var</span> <span class="pl-s1">nameWidget</span> <span class="pl-c1">=</span> <span class="pl-s1">widgets</span><span class="pl-kos">.</span><span class="pl-en">addString</span><span class="pl-kos">(</span><span class="pl-s">"Your name"</span><span class="pl-kos">,</span><span class="pl-s">"foo"</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">var</span> <span class="pl-s1">ageWidget</span> <span class="pl-c1">=</span> <span class="pl-s1">widgets</span><span class="pl-kos">.</span><span class="pl-en">addNumber</span><span class="pl-kos">(</span><span class="pl-s">"Your age"</span><span class="pl-kos">,</span> <span class="pl-c1">35</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">min</span>: <span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">max</span>: <span class="pl-c1">125</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-s1">dialog</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">widgets</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// Placeholder function to show the new settings. Normally you would do something usefull here</span> <span class="pl-c">// with the new settings.</span> <span class="pl-k">function</span> <span class="pl-en">applySettings</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">"Your name is "</span> <span class="pl-c1">+</span> <span class="pl-s1">nameWidget</span><span class="pl-kos">.</span><span class="pl-en">getValue</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">+</span> <span class="pl-s">", and you are "</span> <span class="pl-c1">+</span> <span class="pl-s1">ageWidget</span><span class="pl-kos">.</span><span class="pl-en">getValue</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">+</span> <span class="pl-s">" years old"</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span>

<span class="pl-c">// Add some buttons</span> <span class="pl-s1">dialog</span><span class="pl-kos">.</span><span class="pl-en">addButton</span><span class="pl-kos">(</span><span class="pl-s">'Ok'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">close</span>: <span class="pl-c1">true</span><span class="pl-kos">,</span> <span class="pl-c1">callback</span>: <span class="pl-s1">applySettings</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">dialog</span><span class="pl-kos">.</span><span class="pl-en">addButton</span><span class="pl-kos">(</span><span class="pl-s">'Apply'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">close</span>: <span class="pl-c1">false</span><span class="pl-kos">,</span> <span class="pl-c1">callback</span>: <span class="pl-s1">applySettings</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">dialog</span><span class="pl-kos">.</span><span class="pl-en">addButton</span><span class="pl-kos">(</span><span class="pl-s">'Cancel'</span><span class="pl-kos">,</span><span class="pl-kos">{</span> <span class="pl-c1">close</span>: <span class="pl-s">'fade'</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-k">return</span> <span class="pl-s1">dialog</span><span class="pl-kos">;</span> <span class="pl-kos">}</span>

<span class="pl-k">var</span> <span class="pl-s1">settingsDialog</span> <span class="pl-c1">=</span> <span class="pl-en">createSettingsDialog</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-c">// dialogs are shown on creation, let's hide it until the settings menu item is clicked</span> <span class="pl-s1">settingsDialog</span><span class="pl-kos">.</span><span class="pl-en">hide</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

And change the initialization of the menu bar:

<span class="pl-s1">menu</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s">'File/Settings'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-en">callback</span>: <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">settingsDialog</span><span class="pl-kos">.</span><span class="pl-en">show</span><span class="pl-kos">(</span><span class="pl-s">'fade'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

- is a library that wraps WebGL to make it more user-friendly by creating classes for managing different items like Buffer, Mesh, Texture, Shader and other common aspects of any WebGL applications.

It helps simplifying working with WebGL without having to handle all the low-level calls but without losing any freedom.

Some features are:

  • Easy context creation
  • Classes for:
    • Meshes and Buffers: Fill a buffer easily and upload it to the GPU
    • Textures: load, fill, clone, copy (even blur) for TEXTURE_2D and TEXTURE_CUBE_MAP
    • Shaders: compile from string, from file, insert preprocessor macros, extracts all the uniform locations
    • FrameBufferObjects: to render to a texture, to multiple textures, to depth texture.
  • Some basic primitive shapes (plane, cube, sphere, cylinder, hemisphere).
  • OBJ parser and encoder (easy to add new ones)
  • Loaders for Images and Meshes from URL (uses a placeholder till its loaded)
  • Uses typed-arrays for everything (uses glMatrix for all operations)
  • No garbage generated (reuses containers)
  • Basic Raytracing (for ray-sphere and ray-plane collision)
  • Events system
  • Cross-browser input handling for mouse, keyboard and gamepad
  • Supports multiple WebGL contexts
  • Supports WebGL1 and WebGL2
  • Octree class

It is a fork from LightGL.js by Evan Wallace, but some major changes have been made. Some of the main differences:

  • Matrices have been replaced by glMatrix
  • Meshes are forced to be stored in ArrayBuffer formats
  • Meshes support range rendering with offset
  • Removed fixed pipeline behaviour
  • Better event handling (mouse position, mouse wheel, dragging)
  • Textures expanded to support Arraybuffers and Cubemaps
  • Events system to trigger events from any object
  • Support for multiple WebGL contexts in the same page

This library has been used in several projects like Rendeer.js or Canvas2DtoWebGL.

For a list of similar libraries check this list

 

Demos

Demos are included in the Examples folder but you can check them in this website.

 

Usage

Include the library and dependencies

<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">js/gl-matrix-min.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">js/litegl.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>

Create the context

<span class="pl-k">var</span> <span class="pl-s1">gl</span> <span class="pl-c1">=</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-en">create</span><span class="pl-kos">(</span><span class="pl-kos">{</span><span class="pl-c1">width</span>:<span class="pl-c1">800</span><span class="pl-kos">,</span> <span class="pl-c1">height</span>:<span class="pl-c1">600</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Attach to DOM

<span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">getElementById</span><span class="pl-kos">(</span><span class="pl-s">"mycontainer"</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">appendChild</span><span class="pl-kos">(</span> <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">canvas</span> <span class="pl-kos">)</span>

Get user input

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">captureMouse</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">onmousedown</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span>

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">captureKeys</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">onkey</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span>

Compile shader

<span class="pl-k">var</span> <span class="pl-s1">shader</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Shader</span><span class="pl-kos">(</span> <span class="pl-s1">vertex_shader_code</span><span class="pl-kos">,</span> <span class="pl-s1">fragment_shader_code</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>

Create Mesh

<span class="pl-k">var</span> <span class="pl-s1">mesh</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Mesh</span><span class="pl-kos">(</span><span class="pl-kos">{</span><span class="pl-c1">vertices</span>:<span class="pl-kos">[</span><span class="pl-c1">-</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">-</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">-</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">]</span><span class="pl-kos">,</span> <span class="pl-c1">coords</span>:<span class="pl-kos">[</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">0.5</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">]</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Load a texture

<span class="pl-k">var</span> <span class="pl-s1">texture</span> <span class="pl-c1">=</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Texture</span><span class="pl-kos">.</span><span class="pl-en">fromURL</span><span class="pl-kos">(</span><span class="pl-s">"image.jpg"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">minFilter</span>: <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">LINEAR_MIPMAP_LINEAR</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Render

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">ondraw</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
	<span class="pl-s1">texture</span><span class="pl-kos">.</span><span class="pl-en">bind</span><span class="pl-kos">(</span><span class="pl-c1">0</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
	<span class="pl-k">var</span> <span class="pl-s1">my_uniforms</span> <span class="pl-c1">=</span> <span class="pl-kos">{</span> <span class="pl-c1">u_texture</span>: <span class="pl-c1">0</span><span class="pl-kos">,</span> <span class="pl-c1">u_color</span>: <span class="pl-kos">[</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">]</span> <span class="pl-kos">}</span><span class="pl-kos">;</span>
	<span class="pl-s1">shader</span><span class="pl-kos">.</span><span class="pl-en">uniforms</span><span class="pl-kos">(</span> <span class="pl-s1">my_uniforms</span> <span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">draw</span><span class="pl-kos">(</span> <span class="pl-s1">mesh</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span>

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">animate</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">//calls the requestAnimFrame constantly, which will call ondraw</span>

For better understanding of all the features and how to use them check the guides folder.

is a lightweight 3D scene graph library, meant to be used in 3D web apps and games. It is meant to be flexible and easy to tweak. It used the library litegl.js as a low level layer for WebGL. It comes with some common useful classes like: Scene and SceneNode Camera Renderer ParticleEmissor And because it uses litegl you have all the basic ones (Mesh, Shader and Texture).

Usage

Here is a brief example of how to use it, but I totally encourage to read the more detailed starter guide stored in the guides folder, or to check the boilerplate provided, and finally check the documentation for better understanding of the API.

First include the library and dependencies

<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">js/gl-matrix-min.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">js/litegl.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>="<span class="pl-s">js/rendeer.js</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>

Create the scene

<span class="pl-k">var</span> <span class="pl-s1">scene</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">RD</span><span class="pl-kos">.</span><span class="pl-c1">Scene</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Create the renderer

<span class="pl-k">var</span> <span class="pl-s1">context</span> <span class="pl-c1">=</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-en">create</span><span class="pl-kos">(</span><span class="pl-kos">{</span><span class="pl-c1">width</span>: <span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">innerWidth</span><span class="pl-kos">,</span> <span class="pl-c1">height</span>:<span class="pl-smi">window</span><span class="pl-kos">.</span><span class="pl-c1">innerHeight</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">var</span> <span class="pl-s1">renderer</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">RD</span><span class="pl-kos">.</span><span class="pl-c1">Renderer</span><span class="pl-kos">(</span><span class="pl-s1">context</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Attach to DOM

<span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-c1">body</span><span class="pl-kos">.</span><span class="pl-en">appendChild</span><span class="pl-kos">(</span><span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">canvas</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Get user input

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">captureMouse</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">context</span><span class="pl-kos">.</span><span class="pl-en">onmousedown</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span>
<span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">context</span><span class="pl-kos">.</span><span class="pl-en">onmousemove</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span>

<span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-en">captureKeys</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">context</span><span class="pl-kos">.</span><span class="pl-en">onkey</span> <span class="pl-c1">=</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">e</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> ... <span class="pl-kos">}</span>

Set camera

<span class="pl-k">var</span> <span class="pl-s1">camera</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">RD</span><span class="pl-kos">.</span><span class="pl-c1">Camera</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">camera</span><span class="pl-kos">.</span><span class="pl-en">perspective</span><span class="pl-kos">(</span> <span class="pl-c1">45</span><span class="pl-kos">,</span> <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">canvas</span><span class="pl-kos">.</span><span class="pl-c1">width</span> <span class="pl-c1">/</span> <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">canvas</span><span class="pl-kos">.</span><span class="pl-c1">height</span><span class="pl-kos">,</span> <span class="pl-c1">1</span><span class="pl-kos">,</span> <span class="pl-c1">1000</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">camera</span><span class="pl-kos">.</span><span class="pl-en">lookAt</span><span class="pl-kos">(</span> <span class="pl-kos">[</span><span class="pl-c1">100</span><span class="pl-kos">,</span><span class="pl-c1">100</span><span class="pl-kos">,</span><span class="pl-c1">100</span><span class="pl-kos">]</span><span class="pl-kos">,</span><span class="pl-kos">[</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">]</span><span class="pl-kos">,</span><span class="pl-kos">[</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">]</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>

Create and register mesh

<span class="pl-k">var</span> <span class="pl-s1">mesh</span> <span class="pl-c1">=</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Mesh</span><span class="pl-kos">.</span><span class="pl-en">fromURL</span><span class="pl-kos">(</span><span class="pl-s">"data/mesh.obj"</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">meshes</span><span class="pl-kos">[</span><span class="pl-s">"mymesh"</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-s1">mesh</span><span class="pl-kos">;</span>

load and register texture

<span class="pl-k">var</span> <span class="pl-s1">texture</span> <span class="pl-c1">=</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Texture</span><span class="pl-kos">.</span><span class="pl-en">fromURL</span><span class="pl-kos">(</span><span class="pl-s">"mytexture.png"</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c1">minFilter</span>: <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">LINEAR_MIPMAP_LINEAR</span><span class="pl-kos">,</span> <span class="pl-c1">magFilter</span>: <span class="pl-s1">gl</span><span class="pl-kos">.</span><span class="pl-c1">LINEAR</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">textures</span><span class="pl-kos">[</span><span class="pl-s">"mytexture.png"</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-s1">texture</span><span class="pl-kos">;</span>

Compile and register shader

<span class="pl-k">var</span> <span class="pl-s1">shader</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">GL</span><span class="pl-kos">.</span><span class="pl-c1">Shader</span><span class="pl-kos">(</span><span class="pl-s1">vs_code</span><span class="pl-kos">,</span> <span class="pl-s1">fs_code</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-c1">shaders</span><span class="pl-kos">[</span><span class="pl-s">"phong"</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-s1">shader</span><span class="pl-kos">;</span>

Add a node to the scene

<span class="pl-k">var</span> <span class="pl-s1">node</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-c1">RD</span><span class="pl-kos">.</span><span class="pl-c1">SceneNode</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-c1">color</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">1</span><span class="pl-kos">]</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-c1">mesh</span> <span class="pl-c1">=</span> <span class="pl-s">"mymesh"</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-c1">texture</span> <span class="pl-c1">=</span> <span class="pl-s">"mytexture.png"</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-c1">shader</span> <span class="pl-c1">=</span> <span class="pl-s">"phong"</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-c1">position</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">0</span><span class="pl-kos">]</span><span class="pl-kos">;</span>
<span class="pl-s1">node</span><span class="pl-kos">.</span><span class="pl-en">scale</span><span class="pl-kos">(</span><span class="pl-kos">[</span><span class="pl-c1">10</span><span class="pl-kos">,</span><span class="pl-c1">10</span><span class="pl-kos">,</span><span class="pl-c1">10</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-s1">scene</span><span class="pl-kos">.</span><span class="pl-c1">root</span><span class="pl-kos">.</span><span class="pl-en">addChild</span><span class="pl-kos">(</span><span class="pl-s1">node</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Create main loop

<span class="pl-en">requestAnimationFrame</span><span class="pl-kos">(</span><span class="pl-s1">animate</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">function</span> <span class="pl-en">animate</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
	<span class="pl-en">requestAnimationFrame</span><span class="pl-kos">(</span> <span class="pl-s1">animate</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-s1">last</span> <span class="pl-c1">=</span> <span class="pl-s1">now</span><span class="pl-kos">;</span> <span class="pl-s1">now</span> <span class="pl-c1">=</span> <span class="pl-en">getTime</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">var</span> <span class="pl-s1">dt</span> <span class="pl-c1">=</span> <span class="pl-kos">(</span><span class="pl-s1"><span class="pl-token" data-hydro-click="{"event_type":"code_navigation.click_on_symbol","payload":{"action":"click_on_symbol","repository_id":24465246,"ref":"master","language":"Markdown","originating_url":"https://github.com/jagenjo/rendeer.js","user_id":null}}" data-hydro-click-hmac="3503c1b6e24e7fde15a0a731f44b0d221cd954ec9e5c3b200c42a60e9c443704">now</span></span> <span class="pl-c1">-</span> <span class="pl-s1">last</span><span class="pl-kos">)</span> <span class="pl-c1">*</span> <span class="pl-c1">0.001</span><span class="pl-kos">;</span> <span class="pl-s1">renderer</span><span class="pl-kos">.</span><span class="pl-en"><span class="pl-token" data-hydro-click="{"event_type":"code_navigation.click_on_symbol","payload":{"action":"click_on_symbol","repository_id":24465246,"ref":"master","language":"Markdown","originating_url":"https://github.com/jagenjo/rendeer.js","user_id":null}}" data-hydro-click-hmac="3503c1b6e24e7fde15a0a731f44b0d221cd954ec9e5c3b200c42a60e9c443704">render</span></span><span class="pl-kos">(</span><span class="pl-s1">scene</span><span class="pl-kos">,</span> <span class="pl-s1">camera</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">scene</span><span class="pl-kos">.</span><span class="pl-en">update</span><span class="pl-kos">(</span><span class="pl-s1">dt</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span>

the front-end and back-end library that allows javascript apps to store resources (images, text-files, binaries) in the server. It comes with its own users and units system that allow every user to partition its own space and share it among other users.

Some of the features:

  • REST HTTP API for storing, listing, moving, updating or deleting files.
  • Basic users (register, login, delete, administration )
  • Independent file tree per user
  • Units, users can have several units to store files and share with other users
  • Files can have thumbnail image and metadata

Usage

Once installed you can include the litefileserver.js script in your project you must first login:

<span class="pl-k">var</span> <span class="pl-s1">lfs</span> <span class="pl-c1">=</span> <span class="pl-c1">LFS</span><span class="pl-kos">.</span><span class="pl-en">setup</span><span class="pl-kos">(</span><span class="pl-s">"myhost"</span><span class="pl-kos">,</span> <span class="pl-s1">onReady</span> <span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">var</span> <span class="pl-s1">session</span> <span class="pl-c1">=</span> <span class="pl-c1">null</span><span class="pl-kos">;</span>

<span class="pl-c">//check to see if the server is available</span> <span class="pl-k">function</span> <span class="pl-en">onReady</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c1">LFS</span><span class="pl-kos">.</span><span class="pl-en">login</span><span class="pl-kos">(</span> <span class="pl-s1">username</span><span class="pl-kos">,</span> <span class="pl-s1">password</span><span class="pl-kos">,</span> <span class="pl-s1">onLogin</span> <span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span>

<span class="pl-k">function</span> <span class="pl-en">onLogin</span><span class="pl-kos">(</span> <span class="pl-s1">my_session</span><span class="pl-kos">,</span> <span class="pl-s1">err</span> <span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">if</span><span class="pl-kos">(</span><span class="pl-c1">!</span><span class="pl-s1">my_session</span><span class="pl-kos">)</span> <span class="pl-k">throw</span><span class="pl-kos">(</span><span class="pl-s">"error login in:"</span><span class="pl-kos">,</span> <span class="pl-s1">err</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">session</span> <span class="pl-c1">=</span> <span class="pl-s1">my_session</span><span class="pl-kos">;</span> <span class="pl-kos">}</span>

Once logged you can fetch for files and folders using the session:

<span class="pl-s1">session</span><span class="pl-kos">.</span><span class="pl-en">getUnitsAndFolders</span><span class="pl-kos">(</span> <span class="pl-k">function</span><span class="pl-kos">(</span><span class="pl-s1">units</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
  <span class="pl-c">//units contain info about every unit and which folders it has</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

<span class="pl-s1">session</span><span class="pl-kos">.</span><span class="pl-en">getFiles</span><span class="pl-kos">(</span> <span class="pl-s1">unit_id</span><span class="pl-kos">,</span> <span class="pl-s1">folder</span><span class="pl-kos">,</span> <span class="pl-k">function</span><span class="pl-kos">(</span> <span class="pl-s1">files</span> <span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">//info about the files in that folder</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span>

Check the LFS.Session class for more info about all the actions you can perform (create folders, units, give privileges, upload files, etc).

Also check the demo in the src folder to see an usage of the system.

текстовый код для разбивки и оформления интернет станиц

http://www.w3schools.com - html инструкции

nodes can be programmed easily and it includes an editor to construct and tests the graphs. It can be integrated easily in any existing web applications and graphs can be run without the need of the editor.

 

Features

  • Renders on Canvas2D (zoom in/out and panning, easy to render complex interfaces, can be used inside a WebGLTexture)
  • Easy to use editor (searchbox, keyboard shortcuts, multiple selection, context menu, ...)
  • Optimized to support hundreds of nodes per graph (on editor but also on execution)
  • Customizable theme (colors, shapes, background)
  • Callbacks to personalize every action/drawing/event of nodes
  • Subgraphs (nodes that contain graphs themselves)
  • Live mode system (hides the graph but calls nodes to render whatever they want, useful to create UIs)
  • Graphs can be executed in NodeJS
  • Highly customizable nodes (color, shape, slots vertical or horizontal, widgets, custom rendering)
  • Easy to integrate in any JS application (one single file, no dependencies)
  • Typescript support

examples video: http://github.com/jagenjo/litegraph.js

Nodes provided

Although it is easy to create new node types, LiteGraph comes with some default nodes that could be useful for many cases:

  • Interface (Widgets)
  • Math (trigonometry, math operations)
  • Audio (AudioAPI and MIDI)
  • 3D Graphics (Postprocessing in WebGL)
  • Input (read Gamepad)

 

Installation

You can install it using npm

npm install litegraph.js

Or downloading the build/litegraph.js and css/litegraph.css version from this repository.

 

First project

<html>
<head>
	<link rel="stylesheet" type="text/css" href="litegraph.css">
	<script type="text/javascript" src="litegraph.js"></script>
</head>
<body style='width:100%; height:100%'>
<canvas id='mycanvas' width='1024' height='720' style='border: 1px solid'></canvas>
<script>
var graph = new LGraph();

var canvas = new LGraphCanvas("#mycanvas", graph);

var node_const = LiteGraph.createNode("basic/const");
node_const.pos = [200,200];
graph.add(node_const);
node_const.setValue(4.5);

var node_watch = LiteGraph.createNode("basic/watch");
node_watch.pos = [700,200];
graph.add(node_watch);

node_const.connect(0, node_watch, 0 );

graph.start()
</script>
</body>
</html>

 

How to code a new Node type

Here is an example of how to build a node that sums two inputs:

//node constructor class
function MyAddNode()
{
  this.addInput("A","number");
  this.addInput("B","number");
  this.addOutput("A+B","number");
  this.properties = { precision: 1 };
}

//name to show
MyAddNode.title = "Sum";

//function to call when the node is executed
MyAddNode.prototype.onExecute = function()
{
  var A = this.getInputData(0);
  if( A === undefined )
    A = 0;
  var B = this.getInputData(1);
  if( B === undefined )
    B = 0;
  this.setOutputData( 0, A + B );
}

//register in the system
LiteGraph.registerNodeType("basic/sum", MyAddNode );

or you can wrap an existing function:

function sum(a,b)
{
   return a+b;
}

LiteGraph.wrapFunctionAsNode("math/sum",sum, ["Number","Number"],"Number");

 

Server side

It also works server-side using NodeJS although some nodes do not work in server (audio, graphics, input, etc).

var LiteGraph = require("./litegraph.js").LiteGraph;

var graph = new LiteGraph.LGraph();

var node_time = LiteGraph.createNode("basic/time");
graph.add(node_time);

var node_console = LiteGraph.createNode("basic/console");
node_console.mode = LiteGraph.ALWAYS;
graph.add(node_console);

node_time.connect( 0, node_console, 1 );

graph.start()

Litescene is a scene graph library for WebGL with a component based hierarchical node system. It comes with a realistic rendering pipeline and some interesting components to make it easier to build and share scenes. Component based node system Realistic rendering pipeline, it supports shadows, reflections, textures for all properties, etc Material system that automatically computes the best shader, making it easy to control properties Resources Manager to load and store any kind of resource ( textures, meshes, etc) Serializing methods to convert any Scene to JSON Parser for most common file formats Easy to embed It uses its own low-level library called litegl.js

 

Usage

Include the library and dependencies

<script src="external/gl-matrix-min.js"></script>
<script src="external/litegl.min.js"></script>
<script src="js/litescene.js"></script>

Create the context

var player = new LS.Player({
	width:800, height:600,
	resources: "resources/",
	shaders: "data/shaders.xml"
});

Attach to Canvas to the DOM:

document.getElementById("mycontainer").appendChild( player.canvas )

or you can pass the canvas in the player settings as { canvas: my_canvas_element }

Load the scene and play it:

player.loadScene("scene.json");
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