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120 lines
3.3 KiB
120 lines
3.3 KiB
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Timeline | Data serialization</title>
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<style>
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body, html {
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font-family: arial, sans-serif;
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font-size: 11pt;
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}
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textarea {
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width: 800px;
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height: 200px;
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}
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.buttons {
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margin: 20px 0;
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}
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.buttons input {
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padding: 10px;
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}
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</style>
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<script src="../../dist/vis.js"></script>
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<link href="../../dist/vis.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h1>Serialization and deserialization</h1>
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<p>This example shows how to serialize and deserialize JSON data, and load this in the Timeline via a DataSet. Serialization and deserialization is needed when loading or saving data from a server.</p>
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<textarea id="data">
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[
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{"id": 1, "content": "item 1<br>start", "start": "2014-01-23"},
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{"id": 2, "content": "item 2", "start": "2014-01-18"},
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{"id": 3, "content": "item 3", "start": "2014-01-21"},
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{"id": 4, "content": "item 4", "start": "2014-01-19", "end": "2014-01-24"},
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{"id": 5, "content": "item 5", "start": "2014-01-28", "type": "point"},
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{"id": 6, "content": "item 6", "start": "2014-01-26"}
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]
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</textarea>
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<div class="buttons">
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<input type="button" id="load" value="↓ Load" title="Load data from textarea into the Timeline">
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<input type="button" id="save" value="↑ Save" title="Save data from the Timeline into the textarea">
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</div>
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<div id="visualization"></div>
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<script>
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var txtData = document.getElementById('data');
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var btnLoad = document.getElementById('load');
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var btnSave = document.getElementById('save');
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// Create an empty DataSet.
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// This DataSet is used for two way data binding with the Timeline.
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var items = new vis.DataSet();
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// create a timeline
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var container = document.getElementById('visualization');
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var options = {
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editable: true
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};
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var timeline = new vis.Timeline(container, items, options);
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function loadData () {
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// get and deserialize the data
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var data = JSON.parse(txtData.value);
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// update the data in the DataSet
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//
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// Note: when retrieving updated data from a server instead of a complete
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// new set of data, one can simply update the existing data like:
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//
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// items.update(data);
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//
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// Existing items will then be updated, and new items will be added.
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items.clear();
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items.add(data);
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// adjust the timeline window such that we see the loaded data
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timeline.fit();
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}
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btnLoad.onclick = loadData;
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function saveData() {
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// get the data from the DataSet
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// Note that we specify the output type of the fields start and end
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// as ISODate, which is safely serializable. Other serializable types
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// are Number (unix timestamp) or ASPDate.
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//
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// Alternatively, it is possible to configure the DataSet to convert
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// the output automatically to ISODates like:
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//
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// var options = {
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// type: {start: 'ISODate', end: 'ISODate'}
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// };
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// var items = new vis.DataSet(options);
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// // now items.get() will automatically convert start and end to ISO dates.
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//
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var data = items.get({
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type: {
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start: 'ISODate',
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end: 'ISODate'
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}
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});
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// serialize the data and put it in the textarea
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txtData.value = JSON.stringify(data, null, 2);
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}
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btnSave.onclick = saveData;
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// load the initial data
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loadData();
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</script>
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</body>
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</html>
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