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<h1>Graph documentation</h1>
<h2><a name="Contents"></a>Contents</h2><ul>    <li><a href="#Overview">Overview</a></li>    <li><a href="#Example">Example</a></li>    <li><a href="#Loading">Loading</a></li>    <li>        <a href="#Data_Format">Data Format</a>        <ul>            <li><a href="#Nodes">Nodes</a></li>            <li><a href="#Edges">Edges</a></li>            <li><a href="#DOT_language">DOT language</a></li>        </ul>    </li>    <li><a href="#Configuration_Options">Configuration Options</a></li>    <li><a href="#Methods">Methods</a></li>    <li><a href="#Events">Events</a></li>    <li><a href="#Data_Policy">Data Policy</a></li></ul>
<h2 id="Overview">Overview</h2><p>    Graph is a visualization to display graphs and networks consisting of nodes    and edges. The visualization is easy to use and supports custom shapes,    styles, colors, sizes, images, and more.</p>
<p>    The graph visualization works smooth on any modern browser for up to a    few hundred nodes and edges.</p>
<p>    To get started with Graph, install or download the    <a href="http://visjs.org" target="_blank">vis.js</a> library.</p>
<h2 id="Example">Example</h2><p>    Here a basic graph example. More examples can be found in the    <a href="../examples" target="_blank">examples directory</a>.</p>
<pre class="prettyprint lang-html">&lt;!doctype html&gt;&lt;html&gt;&lt;head&gt;    &lt;title&gt;Graph | Basic usage&lt;/title&gt;
    &lt;script type="text/javascript" src="../../vis.js"&gt;&lt;/script&gt;&lt;/head&gt;
&lt;body&gt;
&lt;div id="mygraph"&gt;&lt;/div&gt;
&lt;script type="text/javascript"&gt;    // create an array with nodes    var nodes = [        {id: 1, label: 'Node 1'},        {id: 2, label: 'Node 2'},        {id: 3, label: 'Node 3'},        {id: 4, label: 'Node 4'},        {id: 5, label: 'Node 5'}    ];
    // create an array with edges    var edges = [        {from: 1, to: 2},        {from: 1, to: 3},        {from: 2, to: 4},        {from: 2, to: 5}    ];
    // create a graph    var container = document.getElementById('mygraph');    var data= {        nodes: nodes,        edges: edges,    };    var options = {        width: '400px',        height: '400px'    };    var graph = new vis.Graph(container, data, options);&lt;/script&gt;
&lt;/body&gt;&lt;/html&gt;</pre>

<h2 id="Loading">Loading</h2><p>    Install or download the <a href="http://visjs.org" target="_blank">vis.js</a> library.    in a subfolder of your project. Include the library script in the head of your html code:</p>
<pre class="prettyprint lang-html">&lt;script type="text/javascript" src="vis/vis.js"&gt;&lt;/script&gt;</pre>

The constructor of the Graph is <code>vis.Graph</code>.<pre class="prettyprint lang-js">var graph = new vis.Graph(container, data, options);</pre>
The constructor accepts three parameters:<ul>    <li>        <code>container</code> is the DOM element in which to create the graph.    </li>    <li>        <code>data</code> is an Object containing properties <code>nodes</code> and        <code>edges</code>, which both contain an array with objects.        Optionally, data may contain an <code>options</code> object.        The parameter <code>data</code> is optional, data can also be set using        the method <code>setData</code>. Section <a href="#Data_Format">Data Format</a>        describes the data object.    </li>    <li>        <code>options</code> is an optional Object containing a name-value map        with options. Options can also be set using the method        <code>setOptions</code>.        Section <a href="#Configuration_Options">Configuration Options</a>        describes the available options.    </li></ul>
<h2 id="Data_Format">Data Format</h2><p>    The <code>data</code> parameter of the Graph constructor is an object    which can contain different types of data.    The following properties are supported in the <code>data</code> object:</p>
<ul>    <li>        <span style="font-weight: bold;">A property pair <code>nodes</code> and <code>edges</code></span>,        both containing an Array with objects. The data formats are described        in the sections <a href="#Nodes">Nodes</a> and <a href="#Edges">Edges</a>.        Example:<pre class="prettyprint lang-js">var data = {    nodes: [...],    edges: [...]};</pre>    </li>    <li>        <span style="font-weight: bold;">A property <code>dot</code></span>,        containing a string with data in the        <a href="http://en.wikipedia.org/wiki/DOT_language" target="_blank">DOT language</a>.        DOT support is described in section <a href="#DOT_language">DOT_language</a>.
        Example:<pre class="prettyprint lang-js">var data = {    dot: '...'};</pre>    </li>    <li>        <span style="font-weight: bold;">A property <code>options</code></span>,        containing an object with global options.        Options can be provided as third parameter in the graph constructor        as well. Section <a href="#Configuration_Options">Configuration Options</a>        describes the available options.
    </li></ul>
<h3 id="Nodes">Nodes</h3>
<p>    Nodes typically have an <code>id</code> and <code>label</code>.    A node must contain at least a property <code>id</code>.    Nodes can have extra properties, used to define the shape and style of the    nodes.</p>
<p>    A JavaScript Array with nodes is constructed like:</p><pre class="prettyprint lang-js">var nodes = [    {        id: 1,        label: 'Node 1'    },    // ... more nodes];</pre>

<p>    Nodes support the following properties:</p>
<table>    <tr>        <th>Name</th>        <th>Type</th>        <th>Required</th>        <th>Description</th>    </tr>
    <tr>        <td>color</td>        <td>String | Object</td>        <td>no</td>        <td>Color for the node.</td>    </tr>
    <tr>        <td>color.background</td>        <td>String</td>        <td>no</td>        <td>Background color for the node.</td>    </tr>
    <tr>        <td>color.border</td>        <td>String</td>        <td>no</td>        <td>Border color for the node.</td>    </tr>
    <tr>        <td>color.highlight</td>        <td>String | Object</td>        <td>no</td>        <td>Color of the node when selected.</td>    </tr>
    <tr>        <td>color.highlight.background</td>        <td>String</td>        <td>no</td>        <td>Background color of the node when selected.</td>    </tr>
    <tr>        <td>color.highlight.border</td>        <td>String</td>        <td>no</td>        <td>Border color of the node when selected.</td>    </tr>
    <tr>        <td>group</td>        <td>Number | String</td>        <td>no</td>        <td>A group number or name. The type can be <code>number</code>,            <code>string</code>, or an other type. All nodes with the same group get            the same color schema.</td>    </tr>
    <tr>        <td>fontColor</td>        <td>String</td>        <td>no</td>        <td>Font color for label in the node.</td>    </tr>
    <tr>        <td>fontFace</td>        <td>String</td>        <td>no</td>        <td>Font face for label in the node, for example "verdana" or "arial".</td>    </tr>
    <tr>        <td>fontSize</td>        <td>Number</td>        <td>no</td>        <td>Font size in pixels for label in the node.</td>    </tr>
    <tr>        <td>id</td>        <td>Number | String</td>        <td>yes</td>        <td>A unique id for this node.            Nodes may not have duplicate id's.            Id's do not need to be consecutive.            An id is normally a number, but may be any type.</td>    </tr>
    <tr>        <td>image</td>        <td>string</td>        <td>no</td>        <td>Url of an image. Only applicable when the shape of the node is            <code>image</code>.</td>    </tr>
    <tr>        <td>radius</td>        <td>number</td>        <td>no</td>        <td>Radius for the node. Applicable for all shapes except <code>box</code>,            <code>circle</code>, <code>ellipse</code> and <code>database</code>.            The value of <code>radius</code> will override a value in            property <code>value</code>.</td>    </tr>
    <tr>        <td>shape</td>        <td>string</td>        <td>no</td>        <td>Define the shape for the node.            Choose from            <code>ellipse</code> (default), <code>circle</code>, <code>box</code>,            <code>database</code>, <code>image</code>, <code>label</code>, <code>dot</code>,            <code>star</code>, <code>triangle</code>, <code>triangleDown</code>, and <code>square</code>.            <br><br>
            In case of <code>image</code>, a property with name <code>image</code> must            be provided, containing image urls.            <br><br>
            The shapes <code>dot</code>, <code>star</code>, <code>triangle</code>,            <code>triangleDown</code>, and <code>square</code>, are scalable.            The size is determined by the properties <code>radius</code> or            <code>value</code>.            <br><br>
            When a property <code>label</code> is provided,            this label will be displayed inside the shape in case of shapes            <code>box</code>, <code>circle</code>, <code>ellipse</code>,            and <code>database</code>.            For all other shapes, the label will be displayed right below the shape.
        </td>    </tr>
    <tr>        <td>label</td>        <td>string</td>        <td>no</td>        <td>Text label to be displayed in the node or under the image of the node.            Multiple lines can be separated by a newline character <code>\n</code> .</td>    </tr>
    <tr>        <td>title</td>        <td>string</td>        <td>no</td>        <td>Title to be displayed when the user hovers over the node.            The title can contain HTML code.</td>    </tr>
    <tr>        <td>value</td>        <td>number</td>        <td>no</td>        <td>A value for the node.            The radius of the nodes will be scaled automatically from minimum to            maximum value.            Only applicable when the shape of the node is <code>dot</code>.            If a <code>radius</code> is provided for the node too, it will override the            radius calculated from the value.</td>    </tr>
    <tr>        <td>x</td>        <td>number</td>        <td>no</td>        <td>Horizontal position in pixels.            The horizontal position of the node will be fixed.            The vertical position y may remain undefined.</td>    </tr>    <tr>        <td>y</td>        <td>number</td>        <td>no</td>        <td>Vertical position in pixels.            The vertical position of the node will be fixed.            The horizontal position x may remain undefined.</td>    </tr>
</table>

<h3 id="Edges">Edges</h3>
<p>    Edges are connections between nodes.    An edge must at least contain properties <code>from</code> and    <code>to</code>, both referring to the <code>id</code> of a node.    Edges can have extra properties, used to define the type and style.</p>
<p>    A JavaScript Array with edges is constructed as:</p><pre class="prettyprint lang-js">var edges = [    {        from: 1,        to: 3    },    // ... more edges];</pre>
<p>    Edges support the following properties:</p>
<table>    <tr>        <th>Name</th>        <th>Type</th>        <th>Required</th>        <th>Description</th>    </tr>
    <tr>        <td>color</td>        <td>string</td>        <td>no</td>        <td>A HTML color for the edge.</td>    </tr>
    <tr>        <td>dash</td>        <td>Object</td>        <td>no</td>        <td>            Object containing properties for dashed lines.            Available properties: <code>length</code>, <code>gap</code>,            <code>altLength</code>.        </td>    </tr>
    <tr>        <td>dash.altLength</td>        <td>number</td>        <td>no</td>        <td>Length of the alternated dash in pixels on a dashed line.            Specifying <code>dash.altLength</code> allows for creating            a dashed line with a dash-dot style, for example when            <code>dash.length=10</code> and <code>dash.altLength=5</code>.            See also the option <code>dahs.length</code>.            Only applicable when the line style is <code>dash-line</code>.</td>    </tr>
    <tr>        <td>dash.length</td>        <td>number</td>        <td>no</td>        <td>Length of a dash in pixels on a dashed line.            Only applicable when the line style is <code>dash-line</code>.</td>    </tr>
    <tr>        <td>dash.gap</td>        <td>number</td>        <td>no</td>        <td>Length of a gap in pixels on a dashed line.            Only applicable when the line style is <code>dash-line</code>.</td>    </tr>
    <tr>        <td>fontColor</td>        <td>String</td>        <td>no</td>        <td>Font color for the text label of the edge.            Only applicable when property <code>label</code> is defined.</td>    </tr>
    <tr>        <td>fontFace</td>        <td>String</td>        <td>no</td>        <td>Font face for the text label of the edge,            for example "verdana" or "arial".            Only applicable when property <code>label</code> is defined.</td>    </tr>
    <tr>        <td>fontSize</td>        <td>Number</td>        <td>no</td>        <td>Font size in pixels for the text label of the edge.            Only applicable when property <code>label</code> is defined.</td>    </tr>
    <tr>        <td>from</td>        <td>Number | String</td>        <td>yes</td>        <td>The id of a node where the edge starts. The type must correspond with            the type of the node id's. This is normally a number, but can be any            type.</td>    </tr>
    <tr>        <td>length</td>        <td>number</td>        <td>no</td>        <td>The length of the edge in pixels.</td>    </tr>
    <tr>        <td>style</td>        <td>string</td>        <td>no</td>        <td>Define a line style for the edge.            Choose from <code>line</code> (default), <code>arrow</code>,            <code>arrow-center</code>, or <code>dash-line</code>.        </td>    </tr>
    <tr>        <td>label</td>        <td>string</td>        <td>no</td>        <td>Text label to be displayed halfway the edge.</td>    </tr>
    <tr>        <td>title</td>        <td>string</td>        <td>no</td>        <td>Title to be displayed when the user hovers over the edge.            The title can contain HTML code.</td>    </tr>
    <tr>        <td>to</td>        <td>Number | String</td>        <td>yes</td>        <td>The id of a node where the edge ends. The type must correspond with            the type of the node id's. This is normally a number, but can be any            type.</td>    </tr>    <tr>        <td>value</td>        <td>number</td>        <td>no</td>        <td>A value for the edge.            The width of the edges will be scaled automatically from minimum to            maximum value.            If a <code>width</code> is provided for the edge too, it will override the            width calculated from the value.</td>    </tr>
    <tr>        <td>width</td>        <td>number</td>        <td>no</td>        <td>Width of the line in pixels. The <code>width</code> will            override a specified <code>value</code>, if a <code>value</code> is            specified too.</td>    </tr></table>


<h3 id="DOT_language">DOT language</h3>
<p>    Graph supports data in the    <a href="http://en.wikipedia.org/wiki/DOT_language" target="_blank">DOT language</a>.    To provide data in the DOT language, the <code>data</code> object must contain    a property <code>dot</code> with a String containing the data.</p>
<p>    Example usage:</p>
<pre class="prettyprint lang-js">// provide data in the DOT languagevar data = {    dot: 'digraph {1 -> 1 -> 2; 2 -> 3; 2 -- 4; 2 -> 1 }'};
// create a graphvar graph = new vis.Graph(container, data);</pre>


<h2 id="Configuration_Options">Configuration Options</h2>
<p>    Options can be used to customize the graph. Options are defined as a JSON object.    All options are optional.</p>
<pre class="prettyprint lang-js">var options = {    width:  '100%',    height: '400px',    edges: {        color: 'red',        width: 2    }};</pre>
<p>    The following options are available.</p>
<table><tr>    <th>Name</th>    <th>Type</th>    <th>Default</th>    <th>Description</th></tr>
<tr>    <td>edges.color</td>    <td>String</td>    <td>"#2B7CE9"</td>    <td>The default color of a edge.</td></tr>
<tr>    <td>edges.dash</td>    <td>Object</td>    <td>Object</td>    <td>        Object containing default properties for dashed lines.        Available properties: <code>length</code>, <code>gap</code>,        <code>altLength</code>.    </td></tr>
<tr>    <td>edges.dash.altLength</td>    <td>number</td>    <td>none</td>    <td>Default length of the alternated dash in pixels on a dashed line.        Specifying <code>dash.altLength</code> allows for creating        a dashed line with a dash-dot style, for example when        <code>dash.length=10</code> and <code>dash.altLength=5</code>.        See also the option <code>dahs.length</code>.        Only applicable when the line style is <code>dash-line</code>.</td></tr>
<tr>    <td>edges.dash.length</td>    <td>number</td>    <td>10</td>    <td>Default length of a dash in pixels on a dashed line.        Only applicable when the line style is <code>dash-line</code>.</td></tr>
<tr>    <td>edges.dash.gap</td>    <td>number</td>    <td>5</td>    <td>Default length of a gap in pixels on a dashed line.        Only applicable when the line style is <code>dash-line</code>.</td></tr>
<tr>    <td>edges.length</td>    <td>Number</td>    <td>100</td>    <td>The default length of a edge.</td></tr><tr>    <td>edges.style</td>    <td>String</td>    <td>"line"</td>    <td>The default style of a edge.        Choose from <code>line</code> (default), <code>arrow</code>,        <code>arrow-center</code>, <code>dash-line</code>.</td></tr><tr>    <td>edges.width</td>    <td>Number</td>    <td>1</td>    <td>The default width of a edge.</td></tr>
<tr>    <td>groups</td>    <td>Object</td>    <td>none</td>    <td>It is possible to specify custom styles for groups.        Each node assigned a group gets the specified style.        See <a href="#Groups">Groups</a> for an overview of the available styles        and an example.    </td></tr>
<tr>    <td>height</td>    <td>String</td>    <td>"400px"</td>    <td>The height of the graph in pixels or as a percentage.</td></tr>
<tr>    <td>nodes.color</td>    <td>String | Object</td>    <td>Object</td>    <td>Default color of the nodes. When color is a string, the color is applied    to both background as well as the border of the node.</td></tr><tr>    <td>nodes.color.background</td>    <td>String</td>    <td>"#97C2FC"</td>    <td>Default background color of the nodes</td></tr><tr>    <td>nodes.color.border</td>    <td>String</td>    <td>"#2B7CE9"</td>    <td>Default border color of the nodes</td></tr><tr>    <td>nodes.color.highlight</td>    <td>String | Object</td>    <td>Object</td>    <td>Default color of the node when the node is selected. Applied to    both border and background of the node.</td></tr><tr>    <td>nodes.color.highlight.background</td>    <td>String</td>    <td>"#D2E5FF"</td>    <td>Default background color of the node when selected.</td></tr><tr>    <td>nodes.color.highlight.border</td>    <td>String</td>    <td>"#2B7CE9"</td>    <td>Default border color of the node when selected.</td></tr>
<tr>    <td>nodes.fontColor</td>    <td>String</td>    <td>"black"</td>    <td>Default font color for the text label in the nodes.</td></tr><tr>    <td>nodes.fontFace</td>    <td>String</td>    <td>"sans"</td>    <td>Default font face for the text label in the nodes, for example "verdana" or "arial".</td></tr><tr>    <td>nodes.fontSize</td>    <td>Number</td>    <td>14</td>    <td>Default font size in pixels for the text label in the nodes.</td></tr><tr>    <td>nodes.group</td>    <td>String</td>    <td>none</td>    <td>Default group for the nodes.</td></tr><tr>    <td>nodes.image</td>    <td>String</td>    <td>none</td>    <td>Default image url for the nodes. only applicable with shape <code>image</code>.</td></tr>
<tr>    <td>nodes.widthMin</td>    <td>Number</td>    <td>16</td>    <td>The minimum width for a scaled image. Only applicable with shape <code>image</code>.</td></tr><tr>    <td>nodes.widthMax</td>    <td>Number</td>    <td>64</td>    <td>The maximum width for a scaled image. Only applicable with shape <code>image</code>.</td></tr>
<tr>    <td>nodes.shape</td>    <td>String</td>    <td>"ellipse"</td>    <td>The default shape for all nodes.        Choose from        <code>ellipse</code> (default), <code>circle</code>, <code>box</code>,        <code>database</code>, <code>image</code>, <code>label</code>, <code>dot</code>,        <code>star</code>, <code>triangle</code>, <code>triangleDown</code>, and <code>square</code>.        This shape can be overridden by a group shape, or by a shape of an individual node.</td></tr><tr>    <td>nodes.radius</td>    <td>Number</td>    <td>5</td>    <td>The default radius for a node. Only applicable with shape <code>dot</code>.</td></tr><tr>    <td>nodes.radiusMin</td>    <td>Number</td>    <td>5</td>    <td>The minimum radius for a scaled node. Only applicable with shape <code>dot</code>.</td></tr><tr>    <td>nodes.radiusMax</td>    <td>Number</td>    <td>20</td>    <td>The maximum radius for a scaled node. Only applicable with shape <code>dot</code>.</td></tr>
<tr>    <td>selectable</td>    <td>Boolean</td>    <td>true</td>    <td>If true, nodes in the graph can be selected by clicking them.        Long press can be used to select multiple nodes.</td></tr>
<tr>    <td>stabilize</td>    <td>Boolean</td>    <td>true</td>    <td>If true, the graph is stabilized before displaying it. If false,        the nodes move to a stabe position visibly in an animated way.</td></tr>
<tr>    <td>width</td>    <td>String</td>    <td>"400px"</td>    <td>The width of the graph in pixels or as a percentage.</td></tr>
</table>
<br>
<h3 id="Groups">Groups</h3>
<p>It is possible to specify custom styles for groups of nodes.    Each node having assigned to this group gets the specified style.    The options <code>groups</code> is an object containing one or multiple groups,    identified by a unique string, the groupname.</p><p>    A group can have the following styles:</p>
<pre class="prettyprint lang-js">var options = {    // ...
    groups: {        mygroup: {            shape: 'circle',            color: {                border: 'black',                background: 'white',                highlight: {                    border: 'yellow',                    background: 'orange'                }            }            fontColor: 'red',            fontSize: 18        }        // add more groups here    }};
var nodes = [    {id: 1, label: 'Node 1'},                    // will get the default style    {id: 2, label: 'Node 2', group: 'mygroup'},  // will get the style from 'mygroup'    // ... more nodes];</pre>

<p>The following styles are available for groups:</p><table>    <tr>        <th>Name</th>        <th>Type</th>        <th>Default</th>        <th>Description</th>    </tr>
    <tr>        <td>color</td>        <td>String | Object</td>        <td>Object</td>        <td>Color of the node</td>    </tr>
    <tr>        <td>color.border</td>        <td>String</td>        <td>"#2B7CE9"</td>        <td>Border color of the node</td>    </tr>
    <tr>        <td>color.background</td>        <td>String</td>        <td>"#97C2FC"</td>        <td>Background color of the node</td>    </tr>    <tr>        <td>color.highlight</td>        <td>String</td>        <td>"#D2E5FF"</td>        <td>Color of the node when selected.</td>    </tr>    <tr>        <td>color.highlight.background</td>        <td>String</td>        <td>"#D2E5FF"</td>        <td>Background color of the node when selected.</td>    </tr>    <tr>        <td>color.highlight.border</td>        <td>String</td>        <td>"#D2E5FF"</td>        <td>Border color of the node when selected.</td>    </tr>    <tr>        <td>image</td>        <td>String</td>        <td>none</td>        <td>Default image for the nodes. Only applicable in combination with            shape <code>image</code>.</td>    </tr>
    <tr>        <td>fontColor</td>        <td>String</td>        <td>"black"</td>        <td>Font color of the node.</td>    </tr>    <tr>        <td>fontFace</td>        <td>String</td>        <td>"sans"</td>        <td>Font name of the node, for example "verdana" or "arial".</td>    </tr>    <tr>        <td>fontSize</td>        <td>Number</td>        <td>14</td>        <td>Font size for the node in pixels.</td>    </tr>    <tr>        <td>shape</td>        <td>String</td>        <td>"ellipse"</td>        <td>Choose from            <code>ellipse</code> (default), <code>circle</code>, <code>box</code>,            <code>database</code>, <code>image</code>, <code>label</code>, <code>dot</code>,            <code>star</code>, <code>triangle</code>, <code>triangleDown</code>, and <code>square</code>.            In case of image, a property with name image must be provided, containing            image urls.</td>    </tr>    <tr>        <td>radius</td>        <td>Number</td>        <td>5</td>        <td>Default radius for the node. Only applicable in combination with            shapes <code>box</code> and <code>dot</code>.</td>    </tr>
</table>

<h2 id="Methods">Methods</h2><p>    Graph supports the following methods.</p>
<table>    <tr>        <th>Method</th>        <th>Return Type</th>        <th>Description</th>    </tr>
    <tr>        <td>setData(data)</td>        <td>none</td>        <td>Loads data. Parameter <code>data</code> is an object containing            nodes, edges, and options. Parameters nodes, edges are an Array.            Options is a name-value map and is optional.        </td>    </tr>
    <tr>        <td>setOptions(options)</td>        <td>none</td>        <td>Set options for the graph. The available options are described in            the section <a href="#Configuration_Options">Configuration Options</a>.        </td>    </tr>
    <tr>        <td>getSelection()</td>        <td>Array of ids</td>        <td>Returns an array with the ids of the selected nodes.            Returns an empty array if no nodes are selected.            The selections are not ordered.        </td>    </tr>
    <tr>        <td>redraw()</td>        <td>none</td>        <td>Redraw the graph. Useful when the layout of the webpage changed.</td>    </tr>
    <tr>        <td>setSelection(selection)</td>        <td>none</td>        <td>Select nodes.            <code>selection</code> is an array with ids of nodes to be selected.            The array <code>selection</code> can contain zero or multiple ids.            Example usage: <code>graph.setSelection([3, 5]);</code> will select            nodes with id 3 and 5.        </td>    </tr>
    <tr>        <td>setSize(width, height)</td>        <td>none</td>        <td>Parameters <code>width</code> and <code>height</code> are strings,            containing a new size for the visualization. Size can be provided in pixels            or in percentages.</td>    </tr>
</table>
<h2 id="Events">Events</h2><p>    Graph fires events after one or multiple nodes are selected.    The event can be catched by creating a listener.</p>
<p>    Here an example on how to catch a <code>select</code> event.</p>
<pre class="prettyprint lang-js">function onSelect() {    alert('selected nodes: ' + graph.getSelection());}
vis.events.addListener(graph, 'select', onSelect);</pre>
<p>    The following events are available.</p>
<table>    <col width="10%">    <col width="60%">    <col width="30%">
    <tr>        <th>name</th>        <th>Description</th>        <th>Properties</th>    </tr>
    <tr>        <td>select</td>        <td>Fired after the user selects or unselects a node by clicking it,            or when selecting a number of nodes by dragging a selection area            around them. Not fired when the method <code>setSelection</code>            is executed. The ids of the selected nodes can be retrieved via the            method <code>getSelection</code>.        </td>        <td>none</td>    </tr></table>

<h2 id="Data_Policy">Data Policy</h2><p>    All code and data is processed and rendered in the browser.    No data is sent to any server.</p>
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