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703 lines
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703 lines
20 KiB
<!doctype html>
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<html>
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<head>
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<title>vis.js | DataSet documentation</title>
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<link rel='stylesheet' href='css/style.css' type='text/css' />
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<link href="css/prettify.css" type="text/css" rel="stylesheet" />
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<link href='css/style.css' type='text/css' rel='stylesheet'>
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<script type="text/javascript" src="lib/prettify/prettify.js"></script>
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</head>
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<body onload="prettyPrint();">
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<div id="container">
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<h1>DataSet documentation</h1>
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<h2 id="Contents">Contents</h2>
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<ul>
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<li><a href="#Overview">Overview</a></li>
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<li><a href="#Example">Example</a></li>
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<li><a href="#Construction">Construction</a></li>
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<li><a href="#Data_Manipulation">Data Manipulation</a></li>
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<li><a href="#Data_Filtering">Data Filtering</a></li>
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<li><a href="#Data_Formatting">Data Formatting</a></li>
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<li><a href="#Subscriptions">Subscriptions</a></li>
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<li><a href="#Data_Policy">Data Policy</a></li>
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</ul>
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<h2 id="Overview">Overview</h2>
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<p>
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Vis.js comes with a flexible DataSet, which can be used to hold and
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manipulate unstructured data and listen for changes in the data.
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The DataSet is key/value based. Data items can be added, updated and
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removed from the DatSet, and one can subscribe to changes in the DataSet.
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The data in the DataSet can be filtered and ordered, and fields (like
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dates) can be converted to a specific type. Data can be normalized when
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appending it to the DataSet as well.
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</p>
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<h2 id="Example">Example</h2>
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<p>
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The following example shows how to use a DataSet.
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</p>
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<pre class="prettyprint lang-js">
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// create a DataSet
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var options = {};
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var data = new vis.DataSet(options);
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// add items
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// note that the data items can contain different properties and data formats
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data.add([
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{id: 1, text: 'item 1', date: new Date(2013, 6, 20), group: 1, first: true},
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{id: 2, text: 'item 2', date: '2013-06-23', group: 2},
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{id: 3, text: 'item 3', date: '2013-06-25', group: 2},
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{id: 4, text: 'item 4'}
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]);
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// subscribe to any change in the DataSet
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data.subscribe('*', function (event, params, senderId) {
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console.log('event', event, params);
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});
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// update an existing item
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data.update({id: 2, group: 1});
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// remove an item
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data.remove(4);
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// get all ids
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var ids = data.getIds();
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console.log('ids', ids);
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// get a specific item
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var item1 = data.get(1);
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console.log('item1', item1);
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// retrieve a filtered subset of the data
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var items = data.get({
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filter: function (item) {
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return item.group == 1;
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}
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});
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console.log('filtered items', items);
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// retrieve formatted items
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var items = data.get({
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fields: ['id', 'date'],
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convert: {
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date: 'ISODate'
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}
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});
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console.log('formatted items', items);
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</pre>
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<h2 id="Construction">Construction</h2>
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<p>
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A DataSet can be constructed as:
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</p>
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<pre class="prettyprint lang-js">
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var data = new vis.DataSet(options)
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</pre>
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<p>
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After construction, data can be added to the DataSet using the methods
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<code>add</code> and <code>update</code>, as described in section
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<a href="#Data_Manipulation">Data Manipulation</a>.
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</p>
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<p>
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The parameter <code>options</code> is optional and is an object which can
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contain the following properties:
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</p>
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<table>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Default value</th>
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<th>Description</th>
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</tr>
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<tr>
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<td>fieldId</td>
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<td>String</td>
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<td>"id"</td>
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<td>
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The name of the field containing the id of the items.
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When data is fetched from a server which uses some specific
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field to identify items, this field name can be specified
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in the DataSet using the option <code>fieldId</code>.
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For example <a href="http://couchdb.apache.org/"
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target="_blank">CouchDB</a> uses the field
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<code>"_id"</code> to identify documents.
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</td>
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</tr>
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<tr>
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<td>convert</td>
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<td>Object.<String, String></td>
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<td>none</td>
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<td>
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An object containing field names as key, and data types as
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value. By default, the type of the properties of items are left
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unchanged. Item properties can be normalized by specifying a
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field type. This is useful for example to automatically convert
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stringified dates coming from a server into JavaScript Date
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objects. The available data types are listed in section
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<a href="#Data_Types">Data Types</a>.
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</td>
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</tr>
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</table>
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<h2 id="Data_Manipulation">Data Manipulation</h2>
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<p>
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The data in a DataSet can be manipulated using the methods
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<a href="#Add"><code>add</code></a>,
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<a href="#Update"><code>update</code></a>,
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and <a href="#Remove"><code>remove</code></a>.
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The DataSet can be emptied using the method
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<a href="#Clear"><code>clear</code></a>.
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</p>
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<pre class="prettyprint lang-js">
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// create a DataSet
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var data = new vis.DataSet();
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// add items
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data.add([
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{id: 1, text: 'item 1'},
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{id: 2, text: 'item 2'},
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{id: 3, text: 'item 3'}
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]);
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// update an item
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data.update({id: 2, text: 'item 2 (updated)'});
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// remove an item
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data.remove(3);
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</pre>
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<h3 id="Add">Add</h3>
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<p>
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Add a data item or an array with items.
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</p>
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Syntax:
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<pre class="prettyprint lang-js">var addedIds = DataSet.add(data [, senderId])</pre>
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The argument <code>data</code> can contain:
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<ul>
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<li>
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An <code>Object</code> containing a single item to be
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added. The item must contain an id.
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</li>
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<li>
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An <code>Array</code> or
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<code>google.visualization.DataTable</code> containing
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a list with items to be added. Each item must contain
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an id.
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</li>
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</ul>
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<p>
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After the items are added to the DataSet, the DataSet will
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trigger an event <code>add</code>. When a <code>senderId</code>
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is provided, this id will be passed with the triggered
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event to all subscribers.
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</p>
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<p>
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The method will throw an Error when an item with the same id
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as any of the added items already exists.
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</p>
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<h3 id="Update">Update</h3>
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<p>
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Update a data item or an array with items.
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</p>
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Syntax:
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<pre class="prettyprint lang-js">var updatedIds = DataSet.update(data [, senderId])</pre>
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The argument <code>data</code> can contain:
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<ul>
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<li>
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An <code>Object</code> containing a single item to be
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updated. The item must contain an id.
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</li>
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<li>
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An <code>Array</code> or
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<code>google.visualization.DataTable</code> containing
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a list with items to be updated. Each item must contain
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an id.
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</li>
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</ul>
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<p>
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The provided properties will be merged in the existing item.
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When an item does not exist, it will be created.
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</p>
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<p>
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After the items are updated, the DataSet will
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trigger an event <code>add</code> for the added items, and
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an event <code>update</code>. When a <code>senderId</code>
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is provided, this id will be passed with the triggered
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event to all subscribers.
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</p>
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<h3 id="Remove">Remove</h3>
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<p>
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Remove a data item or an array with items.
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</p>
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Syntax:
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<pre class="prettyprint lang-js">var removedIds = DataSet.remove(id [, senderId])</pre>
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<p>
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The argument <code>id</code> can be:
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</p>
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<ul>
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<li>
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A <code>Number</code> or <code>String</code> containing the id
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of a single item to be removed.
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</li>
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<li>
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An <code>Object</code> containing the item to be deleted.
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The item will be deleted by its id.
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</li>
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<li>
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An Array containing ids or items to be removed.
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</li>
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</ul>
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<p>
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The method ignores removal of non-existing items, and returns an array
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containing the ids of the items which are actually removed from the
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DataSet.
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</p>
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<p>
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After the items are removed, the DataSet will
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trigger an event <code>remove</code> for the removed items.
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When a <code>senderId</code> is provided, this id will be passed with
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the triggered event to all subscribers.
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</p>
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<h3 id="Clear">Clear</h3>
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<p>
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Clear the complete DataSet.
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</p>
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Syntax:
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<pre class="prettyprint lang-js">var removedIds = DataSet.clear([senderId])</pre>
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<p>
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After the items are removed, the DataSet will
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trigger an event <code>remove</code> for all removed items.
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When a <code>senderId</code> is provided, this id will be passed with
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the triggered event to all subscribers.
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</p>
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<h2 id="Data_Filtering">Data Filtering</h2>
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<p>
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Data can be retrieved from the DataSet using the method <code>get</code>.
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This method can return a single item or a list with items.
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</p>
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<p>A single item can be retrieved by its id:</p>
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<pre class="prettyprint lang-js">
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var item1 = dataset.get(1);
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</pre>
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<p>A selection of items can be retrieved by providing an array with ids:</p>
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<pre class="prettyprint lang-js">
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var items = dataset.get([1, 3, 4]); // retrieve items 1, 3, and 4
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</pre>
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<p>All items can be retrieved by simply calling <code>get</code> without
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specifying an id:</p>
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<pre class="prettyprint lang-js">
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var items = dataset.get(); // retrieve all items
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</pre>
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<p>
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Items can be filtered on specific properties by providing a filter
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function. A filter function is executed for each of the items in the
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DataSet, and is called with the item as parameter. The function must
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return a boolean. All items for which the filter function returns
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true will be emitted.
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</p>
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<pre class="prettyprint lang-js">
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// retrieve all items having a property group with value 2
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var group2 = dataset.get({
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filter: function (item) {
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return (item.group == 2);
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}
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});
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// retrieve all items having a property balance with a value above zero
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var positiveBalance = dataset.get({
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filter: function (item) {
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return (item.balance > 0);
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}
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});
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</pre>
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<h2 id="Data_Formatting">Data Formatting</h2>
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<p>
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The DataSet contains functionality to format data retrieved via the
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method <code>get</code>. The method <code>get</code> has the following
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syntax:
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</p>
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<pre class="prettyprint lang-js">
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var item = DataSet.get(id, options); // retrieve a single item
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var items = DataSet.get(ids, options); // retrieve a selection of items
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var items = DataSet.get(options); // retrieve all items or a filtered set
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</pre>
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<p>
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Where <code>options</code> is an Object which can have the following
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properties:
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</p>
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<table>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Description</th>
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</tr>
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<tr>
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<td>fields</td>
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<td>String[ ]</td>
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<td>
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An array with field names.
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By default, all properties of the items are emitted.
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When <code>fields</code> is defined, only the properties
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whose name is specified in <code>fields</code> will be included
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in the returned items.
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</td>
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</tr>
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<tr>
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<td>convert</td>
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<td>Object.<String, String></td>
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<td>
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An object containing field names as key, and data types as value.
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By default, the type of the properties of an item are left
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unchanged. When a field type is specified, this field in the
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items will be converted to the specified type. This can be used
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for example to convert ISO strings containing a date to a
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JavaScript Date object, or convert strings to numbers or vice
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versa. The available data types are listed in section
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<a href="#Data_Types">Data Types</a>.
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</td>
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</tr>
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<tr>
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<td>filter</td>
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<td>function</td>
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<td>Items can be filtered on specific properties by providing a filter
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function. A filter function is executed for each of the items in the
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DataSet, and is called with the item as parameter. The function must
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return a boolean. All items for which the filter function returns
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true will be emitted.
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See section <a href="#Data_Filtering">Data Filtering</a>.</td>
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</tr>
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</table>
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<p>
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The following example demonstrates formatting properties and filtering
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properties from items.
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</p>
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<pre class="prettyprint lang-js">
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// create a DataSet
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var data = new vis.DataSet();
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data.add([
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{id: 1, text: 'item 1', date: '2013-06-20', group: 1, first: true},
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{id: 2, text: 'item 2', date: '2013-06-23', group: 2},
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{id: 3, text: 'item 3', date: '2013-06-25', group: 2},
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{id: 4, text: 'item 4'}
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]);
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// retrieve formatted items
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var items = data.get({
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fields: ['id', 'date', 'group'], // output the specified fields only
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convert: {
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date: 'Date', // convert the date fields to Date objects
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group: 'String' // convert the group fields to Strings
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}
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});
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</pre>
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<h3 id="Data_Types">Data Types</h3>
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<p>
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DataSet supports the following data types:
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</p>
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|
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<table style="width: 100%">
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<tr>
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<th>Name</th>
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<th>Description</th>
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<th>Examples</th>
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</tr>
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<tr>
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<td>Boolean</td>
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<td>A JavaScript Boolean</td>
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<td>
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<code>true</code><br>
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<code>false</code>
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</td>
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</tr>
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<tr>
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<td>Number</td>
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<td>A JavaScript Number</td>
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<td>
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<code>32</code><br>
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<code>2.4</code>
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</td>
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</tr>
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<tr>
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<td>String</td>
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<td>A JavaScript String</td>
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<td>
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<code>"hello world"</code><br>
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<code>"2013-06-28"</code>
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</td>
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</tr>
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<tr>
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<td>Date</td>
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<td>A JavaScript Date object</td>
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<td>
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<code>new Date()</code><br>
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<code>new Date(2013, 5, 28)</code><br>
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<code>new Date(1372370400000)</code>
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</td>
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</tr>
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<tr>
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<td>Moment</td>
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<td>A Moment object, created with
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<a href="http://momentjs.com/" target="_blank">moment.js</a></td>
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<td>
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<code>moment()</code><br>
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<code>moment('2013-06-28')</code>
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</td>
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</tr>
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<tr>
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<td>ISODate</td>
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<td>A string containing an ISO Date</td>
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<td>
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<code>new Date().toISOString()</code><br>
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<code>"2013-06-27T22:00:00.000Z"</code>
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</td>
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</tr>
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<tr>
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<td>ASPDate</td>
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<td>A string containing an ASP Date</td>
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<td>
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<code>"/Date(1372370400000)/"</code><br>
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<code>"/Date(1198908717056-0700)/"</code>
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</td>
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</tr>
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</table>
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<h2 id="Subscriptions">Subscriptions</h2>
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|
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<p>
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One can subscribe on changes in a DataSet.
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A subscription can be created using the method <code>subscribe</code>,
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and removed with <code>unsubscribe</code>.
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</p>
|
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|
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<pre class="prettyprint lang-js">
|
|
// create a DataSet
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var data = new vis.DataSet();
|
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|
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// subscribe to any change in the DataSet
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data.subscribe('*', function (event, params, senderId) {
|
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console.log('event:', event, 'params:', params, 'senderId:', senderId);
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});
|
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|
|
// add an item
|
|
data.add({id: 1, text: 'item 1'}); // triggers an 'add' event
|
|
data.update({id: 1, text: 'item 1 (updated)'}); // triggers an 'update' event
|
|
data.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 | 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 | 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>
|
|
|
|
</div>
|
|
</body>
|
|
</html>
|