<!--
Copyright (c) 2006-2013, JGraph Ltd
JSON data example for mxGraph. This example demonstrates using
JSON to encode/decode parts of the graph model in mxCodec.
-->
<html>
<head>
<title>JSON data example for mxGraph</title>
<!-- Sets the basepath for the library if not in same directory -->
<script type="text/javascript">
mxBasePath = '../src';
</script>
<!-- Loads and initializes the library -->
<script type="text/javascript" src="../src/js/mxClient.js"></script>
<!-- Example code -->
<script type="text/javascript">
// Program starts here. Creates a sample graph in the
// DOM node with the specified ID. This function is invoked
// from the onLoad event handler of the document (see below).
function main(container)
{
// Checks if the browser is supported
if (!mxClient.isBrowserSupported())
{
// Displays an error message if the browser is not supported.
mxUtils.error('Browser is not supported!', 200, false);
}
else
{
// Disables the built-in context menu
mxEvent.disableContextMenu(container);
// Creates the graph inside the given container
var graph = new mxGraph(container);
// Enables rubberband selection
new mxRubberband(graph);
// Gets the default parent for inserting new cells. This
// is normally the first child of the root (ie. layer 0).
var parent = graph.getDefaultParent();
// Adds cells to the model in a single step
graph.getModel().beginUpdate();
try
{
var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);
v1.data = new CustomData('v1');
var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
v2.data = new CustomData('v2');
var e1 = graph.insertEdge(parent, null, '', v1, v2);
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
}
// Adds an option to view the XML of the graph
document.body.appendChild(mxUtils.button('View XML', function()
{
var encoder = new mxCodec();
var node = encoder.encode(graph.getModel());
mxUtils.popup(mxUtils.getXml(node), true);
}));
};
function CustomData(value)
{
this.value = value;
}
var codec = new mxObjectCodec(new CustomData());
codec.encode = function(enc, obj)
{
var node = enc.document.createElement('CustomData');
mxUtils.setTextContent(node, JSON.stringify(obj));
return node;
};
codec.decode = function(dec, node, into)
{
var obj = JSON.parse(mxUtils.getTextContent(node));
obj.constructor = CustomData;
return obj;
};
mxCodecRegistry.register(codec);
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">
<!-- Creates a container for the graph with a grid wallpaper -->
<div id="graphContainer"
style="position:relative;overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>