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<!DOCTYPE HTML>
<html>
<head>
<title>Timeline | Data serialization</title>
<style>
body, html {
font-family: arial, sans-serif;
font-size: 11pt;
}
textarea {
width: 800px;
height: 200px;
}
.buttons {
margin: 20px 0;
}
.buttons input {
padding: 10px;
}
</style>
<script src="../../../dist/vis.js"></script>
<link href="../../../dist/vis-timeline-graph2d.min.css" rel="stylesheet" type="text/css" />
<script src="../../googleAnalytics.js"></script>
</head>
<body>
<h1>Serialization and deserialization</h1>
<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>
<textarea id="data">
[
{"id": 1, "content": "item 1", "start": "2014-01-01 01:00:00"},
{"id": 2, "content": "item 2", "start": "2014-01-01 02:00:00"},
{"id": 3, "content": "item 3", "start": "2014-01-01 03:00:00"},
{"id": 4, "content": "item 4", "start": "2014-01-01 04:00:00", "end": "2014-01-01 04:30:00"},
{"id": 5, "content": "item 5", "start": "2014-01-01 05:00:00", "type": "point"},
{"id": 6, "content": "item 6", "start": "2014-01-01 06:00:00"}
]
</textarea>
<div class="buttons">
<input type="button" id="load" value="↓ Load" title="Load data from textarea into the Timeline">
<input type="button" id="save" value="↑ Save" title="Save data from the Timeline into the textarea">
</div>
<div id="visualization"></div>
<script>
var txtData = document.getElementById('data');
var btnLoad = document.getElementById('load');
var btnSave = document.getElementById('save');
// Create an empty DataSet.
// This DataSet is used for two way data binding with the Timeline.
var items = new vis.DataSet();
// create a timeline
var container = document.getElementById('visualization');
var options = {
editable: true
};
var timeline = new vis.Timeline(container, items, options);
function loadData () {
// get and deserialize the data
var data = JSON.parse(txtData.value);
// update the data in the DataSet
//
// Note: when retrieving updated data from a server instead of a complete
// new set of data, one can simply update the existing data like:
//
// items.update(data);
//
// Existing items will then be updated, and new items will be added.
items.clear();
items.add(data);
// adjust the timeline window such that we see the loaded data
timeline.fit();
}
btnLoad.onclick = loadData;
function saveData() {
// get the data from the DataSet
//
// Note that we specify the output type of the fields start and end
// as "ISODate", which is safely serializable. Other serializable types
// are "Number" (unix timestamp), "ASPDate" or "String" (without timezone!).
//
// Alternatively, it is possible to configure the DataSet to convert
// the output automatically to ISODates like:
//
// var options = {
// type: {start: 'ISODate', end: 'ISODate'}
// };
// var items = new vis.DataSet(options);
// // now items.get() will automatically convert start and end to ISO dates.
//
var data = items.get({
type: {
start: 'ISODate',
end: 'ISODate'
}
});
// serialize the data and put it in the textarea
txtData.value = JSON.stringify(data, null, 2);
}
btnSave.onclick = saveData;
// load the initial data
loadData();
</script>
</body>
</html>
|
