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DataSet and DataView now have new styling

flowchartTest
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@ -93,6 +93,7 @@ The following tables are used:
- A table 'methods' with methods. Columns: Method, Return Type, Description
- A table 'events' with events. Columns: Name, Properties, Description
- A table 'styles' with styles. Columns: Description, Values
- A table 'datatypes' with data types. Columns: Name, Description, Examples
*/
table.properties td:nth-child(2),
table.properties td:nth-child(3),

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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.&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 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[&nbsp;] | Object.&lt;String,&nbsp;String&gt;</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&nbsp;[,&nbsp;options]&nbsp;[,&nbsp;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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