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| <div class="container full"> | |||||
| <h1>DataView 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="#Methods">Methods</a></li> | |||||
| <li><a href="#Properties">Properties</a></li> | |||||
| <li><a href="#Getting_Data">Getting Data</a></li> | |||||
| <li><a href="#Subscriptions">Subscriptions</a></li> | |||||
| </ul> | |||||
| <h2 id="Overview">Overview</h2> | |||||
| <p> | |||||
| A DataView offers a filtered and/or formatted view on a | |||||
| <a href="dataset.html">DataSet</a>. | |||||
| One can subscribe on changes in a DataView, and easily get filtered or | |||||
| formatted data without having to specify filters and field types all | |||||
| the time. | |||||
| </p> | |||||
| <h2 id="Example">Example</h2> | |||||
| <p> | |||||
| The following example shows how to use a DataView. | |||||
| </p> | |||||
| <pre class="prettyprint lang-js"> | |||||
| // create a DataSet | |||||
| var data = new vis.DataSet(); | |||||
| data.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'} | |||||
| ]); | |||||
| // create a DataView | |||||
| // the view will only contain items having a property group with value 1, | |||||
| // and will only output fields id, text, and date. | |||||
| var view = new vis.DataView(data, { | |||||
| filter: function (item) { | |||||
| return (item.group == 1); | |||||
| }, | |||||
| fields: ['id', 'text', 'date'] | |||||
| }); | |||||
| // subscribe to any change in the DataView | |||||
| view.on('*', function (event, properties, senderId) { | |||||
| console.log('event', event, properties); | |||||
| }); | |||||
| // update an item in the data set | |||||
| data.update({id: 2, group: 1}); | |||||
| // get all ids in the view | |||||
| var ids = view.getIds(); | |||||
| console.log('ids', ids); // will output [1, 2] | |||||
| // get all items in the view | |||||
| var items = view.get(); | |||||
| </pre> | |||||
| <h2 id="Construction">Construction</h2> | |||||
| <p> | |||||
| A DataView can be constructed as: | |||||
| </p> | |||||
| <pre class="prettyprint lang-js"> | |||||
| var data = new vis.DataView(dataset, options) | |||||
| </pre> | |||||
| <p> | |||||
| where: | |||||
| </p> | |||||
| <ul> | |||||
| <li> | |||||
| <code>dataset</code> is a DataSet or DataView. | |||||
| </li> | |||||
| <li> | |||||
| <code>options</code> is an object which can | |||||
| contain the following properties. Note that these properties | |||||
| are exactly the same as the properties available in methods | |||||
| <code>DataSet.get</code> and <code>DataView.get</code>. | |||||
| <table class="options"> | |||||
| <tr> | |||||
| <th>Name</th> | |||||
| <th>Type</th> | |||||
| <th>Default</th> | |||||
| <th>Description</th> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>convert</td> | |||||
| <td>Object.<String, String></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 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="dataset.html#Data_Types">Data Types</a>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>fields</td> | |||||
| <td>String[ ] | Object.<String, String></td> | |||||
| <td>none</td> | |||||
| <td> | |||||
| An array with field names, or an object with current field name and | |||||
| new field name that the field is returned as. | |||||
| 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>filter</td> | |||||
| <td>function</td> | |||||
| <td>none</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 also section <a href="dataset.html#Data_Filtering">Data Filtering</a>.</td> | |||||
| </tr> | |||||
| </table> | |||||
| </li> | |||||
| </ul> | |||||
| <h2 id="Methods">Methods</h2> | |||||
| <p>DataView contains the following methods.</p> | |||||
| <table class="methods"> | |||||
| <tr> | |||||
| <th>Method</th> | |||||
| <th>Return Type</th> | |||||
| <th>Description</th> | |||||
| </tr> | |||||
| <tr> | |||||
| <td> | |||||
| get([options] [, data])<br> | |||||
| get(id [,options] [, data])<br> | |||||
| get(ids [, options] [, data]) | |||||
| </td> | |||||
| <td>Object | Array</td> | |||||
| <td> | |||||
| Get a single item, multiple items, or all items from the DataView. | |||||
| Usage examples can be found in section <a href="#Getting_Data">Getting Data</a>, and the available <code>options</code> are described in section <a href="#Data_Selection">Data Selection</a>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td> | |||||
| getDataSet() | |||||
| </td> | |||||
| <td>DataSet</td> | |||||
| <td> | |||||
| Get the DataSet to which the DataView is connected. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td> | |||||
| getIds([options]) | |||||
| </td> | |||||
| <td>Number[]</td> | |||||
| <td> | |||||
| Get ids of all items or of a filtered set of items. | |||||
| Available <code>options</code> are described in section <a href="dataset.html#Data_Selection">Data Selection</a>, except that options <code>fields</code> and <code>type</code> are not applicable in case of <code>getIds</code>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>off(event, callback)</td> | |||||
| <td>none</td> | |||||
| <td> | |||||
| Unsubscribe from an event, remove an event listener. See section <a href="#Subscriptions">Subscriptions</a>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>on(event, callback)</td> | |||||
| <td>none</td> | |||||
| <td> | |||||
| Subscribe to an event, add an event listener. See section <a href="#Subscriptions">Subscriptions</a>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>refresh()</td> | |||||
| <td>none</td> | |||||
| <td> | |||||
| Refresh the filter results of a DataView. Useful when the filter function contains dynamic properties, like: | |||||
| <pre class="prettyprint lang-js">var data = new vis.DataSet(...); | |||||
| var view = new vis.DataView(data, { | |||||
| filter: function (item) { | |||||
| return item.value > threshold; | |||||
| } | |||||
| });</pre> | |||||
| In this example, <code>threshold</code> is an external parameter. When the value of <code>threshold</code> changes, the DataView must be notified that the filter results may have changed by calling <code>DataView.refresh()</code>. | |||||
| </td> | |||||
| </tr> | |||||
| <tr> | |||||
| <td> | |||||
| setDataSet(data) | |||||
| </td> | |||||
| <td>none</td> | |||||
| <td> | |||||
| Replace the DataSet of the DataView. Parameter <code>data</code> can be a DataSet or a DataView. | |||||
| </td> | |||||
| </tr> | |||||
| </table> | |||||
| <h2 id="Properties">Properties</h2> | |||||
| <p>DataView contains the following properties.</p> | |||||
| <table> | |||||
| <colgroup> | |||||
| <col width="200"> | |||||
| </colgroup> | |||||
| <tr> | |||||
| <th>Property</th> | |||||
| <th>Type</th> | |||||
| <th>Description</th> | |||||
| </tr> | |||||
| <tr> | |||||
| <td>length</td> | |||||
| <td>Number</td> | |||||
| <td>The number of items in the DataView.</td> | |||||
| </tr> | |||||
| </table> | |||||
| <h2 id="Getting_Data">Getting Data</h2> | |||||
| <p> | |||||
| Data of the DataView can be retrieved using the method <code>get</code>. | |||||
| </p> | |||||
| <pre class="prettyprint lang-js"> | |||||
| var items = view.get(); | |||||
| </pre> | |||||
| <p> | |||||
| Data of a DataView can be filtered and formatted again, in exactly the | |||||
| same way as in a DataSet. See sections | |||||
| <a href="dataset.html#Data_Manipulation">Data Manipulation</a> and | |||||
| <a href="dataset.html#Data_Selection">Data Selection</a> for more | |||||
| information. | |||||
| </p> | |||||
| <pre class="prettyprint lang-js"> | |||||
| var items = view.get({ | |||||
| fields: ['id', 'score'], | |||||
| filter: function (item) { | |||||
| return (item.score > 50); | |||||
| } | |||||
| }); | |||||
| </pre> | |||||
| <h2 id="Subscriptions">Subscriptions</h2> | |||||
| <p> | |||||
| One can subscribe on changes in the DataView. Subscription works exactly | |||||
| the same as for DataSets. See the documentation on | |||||
| <a href="dataset.html#Subscriptions">subscriptions in a DataSet</a> | |||||
| for more information. | |||||
| </p> | |||||
| <pre class="prettyprint lang-js"> | |||||
| // create a DataSet and a view on the data set | |||||
| var data = new vis.DataSet(); | |||||
| var view = new vis.DataView({ | |||||
| filter: function (item) { | |||||
| return (item.group == 2); | |||||
| } | |||||
| }); | |||||
| // subscribe to any change in the DataView | |||||
| view.on('*', function (event, properties, senderId) { | |||||
| console.log('event:', event, 'properties:', properties, 'senderId:', senderId); | |||||
| }); | |||||
| // add, update, and remove data in the DataSet... | |||||
| </pre> | |||||
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