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    <h1>DataSet documentation</h1>
    <h2 id="Contents">Contents</h2>    <ul>        <li><a href="#Overview">Overview</a></li>        <li><a href="#Example">Example</a></li>        <li><a href="#Construction">Construction</a></li>        <li><a href="#Data_Manipulation">Data Manipulation</a></li>        <li><a href="#Data_Filtering">Data Filtering</a></li>        <li><a href="#Data_Formatting">Data Formatting</a></li>        <li><a href="#Subscriptions">Subscriptions</a></li>        <li><a href="#Data_Policy">Data Policy</a></li>    </ul>

    <h2 id="Overview">Overview</h2>
    <p>        Vis.js comes with a flexible DataSet, which can be used to hold and        manipulate unstructured data and listen for changes in the data.        The DataSet is key/value based. Data items can be added, updated and        removed from the DatSet, and one can subscribe to changes in the DataSet.        The data in the DataSet can be filtered and ordered, and fields (like        dates) can be converted to a specific type. Data can be normalized when        appending it to the DataSet as well.    </p>

    <h2 id="Example">Example</h2>
    <p>        The following example shows how to use a DataSet.    </p>
<pre class="prettyprint lang-js">// create a DataSetvar options = {};var data = new vis.DataSet(options);
// add items// note that the data items can contain different properties and data formatsdata.add([    {id: 1, text: 'item 1', date: new Date(2013, 6, 20), group: 1, first: true},    {id: 2, text: 'item 2', date: '2013-06-23', group: 2},    {id: 3, text: 'item 3', date: '2013-06-25', group: 2},    {id: 4, text: 'item 4'}]);
// subscribe to any change in the DataSetdata.subscribe('*', function (event, params, senderId) {    console.log('event', event, params);});
// update an existing itemdata.update({id: 2, group: 1});
// remove an itemdata.remove(4);
// get all idsvar ids = data.getIds();console.log('ids', ids);
// get a specific itemvar item1 = data.get(1);console.log('item1', item1);
// retrieve a filtered subset of the datavar items = data.get({    filter: function (item) {        return item.group == 1;    }});console.log('filtered items', items);
// retrieve formatted itemsvar items = data.get({    fields: ['id', 'date'],    convert: {        date: 'ISODate'    }});console.log('formatted items', items);</pre>


    <h2 id="Construction">Construction</h2>
    <p>        A DataSet can be constructed as:    </p>
<pre class="prettyprint lang-js">var data = new vis.DataSet(options)</pre>
    <p>        After construction, data can be added to the DataSet using the methods        <code>add</code> and <code>update</code>, as described in section        <a href="#Data_Manipulation">Data Manipulation</a>.    </p>
    <p>        The parameter <code>options</code> is optional and is an object which can        contain the following properties:    </p>
    <table>        <tr>            <th>Name</th>            <th>Type</th>            <th>Default value</th>            <th>Description</th>        </tr>        <tr>            <td>fieldId</td>            <td>String</td>            <td>"id"</td>            <td>                The name of the field containing the id of the items.
                When data is fetched from a server which uses some specific                field to identify items, this field name can be specified                in the DataSet using the option <code>fieldId</code>.                For example <a href="http://couchdb.apache.org/"                               target="_blank">CouchDB</a> uses the field                <code>"_id"</code> to identify documents.            </td>        </tr>        <tr>            <td>convert</td>            <td>Object.&lt;String,&nbsp;String&gt;</td>            <td>none</td>            <td>                An object containing field names as key, and data types as                value. By default, the type of the properties of items are left                unchanged. Item properties can be normalized by specifying a                field type. This is useful for example to automatically convert                stringified dates coming from a server into JavaScript Date                objects. The available data types are listed in section                <a href="#Data_Types">Data Types</a>.            </td>        </tr>    </table>

    <h2 id="Data_Manipulation">Data Manipulation</h2>
    <p>        The data in a DataSet can be manipulated using the methods        <a href="#Add"><code>add</code></a>,        <a href="#Update"><code>update</code></a>,        and <a href="#Remove"><code>remove</code></a>.        The DataSet can be emptied using the method        <a href="#Clear"><code>clear</code></a>.    </p>
<pre class="prettyprint lang-js">// create a DataSetvar data = new vis.DataSet();
// add itemsdata.add([    {id: 1, text: 'item 1'},    {id: 2, text: 'item 2'},    {id: 3, text: 'item 3'}]);
// update an itemdata.update({id: 2, text: 'item 2 (updated)'});
// remove an itemdata.remove(3);</pre>
    <h3 id="Add">Add</h3>
    <p>        Add a data item or an array with items.    </p>
    Syntax:    <pre class="prettyprint lang-js">var addedIds = DataSet.add(data [, senderId])</pre>
    The argument <code>data</code> can contain:    <ul>        <li>            An <code>Object</code> containing a single item to be            added. The item must contain an id.        </li>        <li>            An <code>Array</code> or            <code>google.visualization.DataTable</code> containing            a list with items to be added. Each item must contain            an id.        </li>    </ul>
    <p>        After the items are added to the DataSet, the DataSet will        trigger an event <code>add</code>. When a <code>senderId</code>        is provided, this id will be passed with the triggered        event to all subscribers.    </p>
    <p>        The method will throw an Error when an item with the same id        as any of the added items already exists.    </p>
    <h3 id="Update">Update</h3>
    <p>        Update a data item or an array with items.    </p>
    Syntax:    <pre class="prettyprint lang-js">var updatedIds = DataSet.update(data [, senderId])</pre>
    The argument <code>data</code> can contain:    <ul>        <li>            An <code>Object</code> containing a single item to be            updated. The item must contain an id.        </li>        <li>            An <code>Array</code> or            <code>google.visualization.DataTable</code> containing            a list with items to be updated. Each item must contain            an id.        </li>    </ul>
    <p>        The provided properties will be merged in the existing item.        When an item does not exist, it will be created.    </p>
    <p>        After the items are updated, the DataSet will        trigger an event <code>add</code> for the added items, and        an event <code>update</code>. When a <code>senderId</code>        is provided, this id will be passed with the triggered        event to all subscribers.    </p>
    <h3 id="Remove">Remove</h3>
    <p>        Remove a data item or an array with items.    </p>
    Syntax:    <pre class="prettyprint lang-js">var removedIds = DataSet.remove(id [, senderId])</pre>
    <p>        The argument <code>id</code> can be:    </p>    <ul>        <li>            A <code>Number</code> or <code>String</code> containing the id            of a single item to be removed.        </li>        <li>            An <code>Object</code> containing the item to be deleted.            The item will be deleted by its id.        </li>        <li>            An Array containing ids or items to be removed.        </li>    </ul>
    <p>        The method ignores removal of non-existing items, and returns an array        containing the ids of the items which are actually removed from the        DataSet.    </p>
    <p>        After the items are removed, the DataSet will        trigger an event <code>remove</code> for the removed items.        When a <code>senderId</code> is provided, this id will be passed with        the triggered event to all subscribers.    </p>

    <h3 id="Clear">Clear</h3>
    <p>        Clear the complete DataSet.    </p>
    Syntax:    <pre class="prettyprint lang-js">var removedIds = DataSet.clear([senderId])</pre>
    <p>        After the items are removed, the DataSet will        trigger an event <code>remove</code> for all removed items.        When a <code>senderId</code> is provided, this id will be passed with        the triggered event to all subscribers.    </p>

    <h2 id="Data_Filtering">Data Filtering</h2>
    <p>        Data can be retrieved from the DataSet using the method <code>get</code>.        This method can return a single item or a list with items.    </p>
    <p>A single item can be retrieved by its id:</p>
<pre class="prettyprint lang-js">var item1 = dataset.get(1);</pre>
    <p>A selection of items can be retrieved by providing an array with ids:</p>
<pre class="prettyprint lang-js">var items = dataset.get([1, 3, 4]); // retrieve items 1, 3, and 4</pre>
    <p>All items can be retrieved by simply calling <code>get</code> without    specifying an id:</p>
<pre class="prettyprint lang-js">var items = dataset.get();          // retrieve all items</pre>
    <p>        Items can be filtered on specific properties by providing a filter        function. A filter function is executed for each of the items in the        DataSet, and is called with the item as parameter. The function must        return a boolean. All items for which the filter function returns        true will be emitted.    </p>
<pre class="prettyprint lang-js">// retrieve all items having a property group with value 2var group2 = dataset.get({    filter: function (item) {        return (item.group == 2);    }});
// retrieve all items having a property balance with a value above zerovar positiveBalance = dataset.get({    filter: function (item) {        return (item.balance > 0);    }});
</pre>

    <h2 id="Data_Formatting">Data Formatting</h2>
    <p>        The DataSet contains functionality to format data retrieved via the        method <code>get</code>. The method <code>get</code> has the following        syntax:    </p>
<pre class="prettyprint lang-js">var item  = DataSet.get(id, options);   // retrieve a single itemvar items = DataSet.get(ids, options);  // retrieve a selection of itemsvar items = DataSet.get(options);       // retrieve all items or a filtered set</pre>
    <p>        Where <code>options</code> is an Object which can have the following        properties:    </p>
    <table>        <tr>            <th>Name</th>            <th>Type</th>            <th>Description</th>        </tr>
        <tr>            <td>fields</td>            <td>String[&nbsp;]</td>            <td>                An array with field names.                By default, all properties of the items are emitted.                When <code>fields</code> is defined, only the properties                whose name is specified in <code>fields</code> will be included                in the returned items.            </td>        </tr>
        <tr>            <td>convert</td>            <td>Object.&lt;String,&nbsp;String&gt;</td>            <td>                An object containing field names as key, and data types as value.                By default, the type of the properties of an item are left                unchanged. When a field type is specified, this field in the                items will be converted to the specified type. This can be used                for example to convert ISO strings containing a date to a                JavaScript Date object, or convert strings to numbers or vice                versa. The available data types are listed in section                <a href="#Data_Types">Data Types</a>.            </td>        </tr>
        <tr>            <td>filter</td>            <td>function</td>            <td>Items can be filtered on specific properties by providing a filter                function. A filter function is executed for each of the items in the                DataSet, and is called with the item as parameter. The function must                return a boolean. All items for which the filter function returns                true will be emitted.                See section <a href="#Data_Filtering">Data Filtering</a>.</td>        </tr>    </table>
    <p>        The following example demonstrates formatting properties and filtering        properties from items.    </p>
<pre class="prettyprint lang-js">// create a DataSetvar data = new vis.DataSet();data.add([    {id: 1, text: 'item 1', date: '2013-06-20', group: 1, first: true},    {id: 2, text: 'item 2', date: '2013-06-23', group: 2},    {id: 3, text: 'item 3', date: '2013-06-25', group: 2},    {id: 4, text: 'item 4'}]);
// retrieve formatted itemsvar items = data.get({    fields: ['id', 'date', 'group'],    // output the specified fields only    convert: {        date: 'Date',                   // convert the date fields to Date objects        group: 'String'                 // convert the group fields to Strings    }});</pre>


    <h3 id="Data_Types">Data Types</h3>
    <p>        DataSet supports the following data types:    </p>
    <table style="width: 100%">        <tr>            <th>Name</th>            <th>Description</th>            <th>Examples</th>        </tr>        <tr>            <td>Boolean</td>            <td>A JavaScript Boolean</td>            <td>                <code>true</code><br>                <code>false</code>            </td>        </tr>        <tr>            <td>Number</td>            <td>A JavaScript Number</td>            <td>                <code>32</code><br>                <code>2.4</code>            </td>        </tr>        <tr>            <td>String</td>            <td>A JavaScript String</td>            <td>                <code>"hello world"</code><br>                <code>"2013-06-28"</code>            </td>        </tr>        <tr>            <td>Date</td>            <td>A JavaScript Date object</td>            <td>                <code>new Date()</code><br>                <code>new Date(2013, 5, 28)</code><br>                <code>new Date(1372370400000)</code>            </td>        </tr>        <tr>            <td>Moment</td>            <td>A Moment object, created with                <a href="http://momentjs.com/" target="_blank">moment.js</a></td>            <td>                <code>moment()</code><br>                <code>moment('2013-06-28')</code>            </td>        </tr>        <tr>            <td>ISODate</td>            <td>A string containing an ISO Date</td>            <td>                <code>new Date().toISOString()</code><br>                <code>"2013-06-27T22:00:00.000Z"</code>            </td>        </tr>        <tr>            <td>ASPDate</td>            <td>A string containing an ASP Date</td>            <td>                <code>"/Date(1372370400000)/"</code><br>                <code>"/Date(1198908717056-0700)/"</code>            </td>        </tr>    </table>

    <h2 id="Subscriptions">Subscriptions</h2>
    <p>        One can subscribe on changes in a DataSet.        A subscription can be created using the method <code>subscribe</code>,        and removed with <code>unsubscribe</code>.    </p>
<pre class="prettyprint lang-js">// create a DataSetvar data = new vis.DataSet();
// subscribe to any change in the DataSetdata.subscribe('*', function (event, params, senderId) {    console.log('event:', event, 'params:', params, 'senderId:', senderId);});
// add an itemdata.add({id: 1, text: 'item 1'});              // triggers an 'add' eventdata.update({id: 1, text: 'item 1 (updated)'}); // triggers an 'update' eventdata.remove(1);                                 // triggers an 'remove' event</pre>

    <h3 id="Subscribe">Subscribe</h3>
    <p>        Subscribe to an event.    </p>
    Syntax:    <pre class="prettyprint lang-js">DataSet.subscribe(event, callback)</pre>
    Where:    <ul>        <li>            <code>event</code> is a String containing any of the events listed            in section <a href="#Events">Events</a>.        </li>        <li>            <code>callback</code> is a callback function which will be called            each time the event occurs. The callback function is described in            section <a href="#Callback">Callback</a>.        </li>    </ul>
    <h3 id="Unsubscribe">Unsubscribe</h3>
    <p>        Unsubscribe from an event.    </p>
    Syntax:    <pre class="prettyprint lang-js">DataSet.unsubscribe(event, callback)</pre>
    Where <code>event</code> and <code>callback</code> correspond with the    parameters used to <a href="#Subscribe">subscribe</a> to the event.
    <h3 id="Events">Events</h3>
    <p>        The following events are available for subscription:    </p>
    <table>        <tr>            <th>Event</th>            <th>Description</th>        </tr>        <tr>            <td>add</td>            <td>                The <code>add</code> event is triggered when an item                or a set of items is added, or when an item is updated while                not yet existing.            </td>        </tr>        <tr>            <td>update</td>            <td>                The <code>update</code> event is triggered when an existing item                or a set of existing items is updated.            </td>        </tr>        <tr>            <td>remove</td>            <td>                The <code>remove</code> event is triggered when an item                or a set of items is removed.            </td>        </tr>        <tr>            <td>*</td>            <td>                The <code>*</code> event is triggered when any of the events                <code>add</code>, <code>update</code>, and <code>remove</code>                occurs.            </td>        </tr>    </table>
    <h3 id="Callback">Callback</h3>
    <p>        The callback functions of subscribers are called with the following        parameters:    </p>
    <pre class="prettyprint lang-js">function (event, params, senderId) {    // handle the event});</pre>
    <p>    where the parameters are defined as    </p>
    <table>        <tr>            <th>Parameter</th>            <th>Type</th>            <th>Description</th>        </tr>        <tr>            <td>event</td>            <td>String</td>            <td>                Any of the available events: <code>add</code>,                <code>update</code>, or <code>remove</code>.            </td>        </tr>        <tr>            <td>params</td>            <td>Object&nbsp;|&nbsp;null</td>            <td>                Optional parameters providing more information on the event.                In case of the events <code>add</code>,                <code>update</code>, and <code>remove</code>,                <code>params</code> is always an object containing a property                items, which contains an array with the ids of the affected                items.            </td>        </tr>        <tr>            <td>senderId</td>            <td>String&nbsp;|&nbsp;Number</td>            <td>                An senderId, optionally provided by the application code                which triggered the event. If senderId is not provided, the                argument will be <code>null</code>.            </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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