jrtechs
/
jrtechs-vis
mirror of https://github.com/jrtechs/vis.git

<!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<br>start", "start": "2014-01-23"},  {"id": 2, "content": "item 2", "start": "2014-01-18"},  {"id": 3, "content": "item 3", "start": "2014-01-21"},  {"id": 4, "content": "item 4", "start": "2014-01-19", "end": "2014-01-24"},  {"id": 5, "content": "item 5", "start": "2014-01-28", "type": "point"},  {"id": 6, "content": "item 6", "start": "2014-01-26"}]</textarea>
<div class="buttons">  <input type="button" id="load" value="&darr; Load" title="Load data from textarea into the Timeline">  <input type="button" id="save" value="&uarr; 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) or ASPDate.    //    // 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>