<!--
Copyright (c) 2006-2013, JGraph Ltd
Validation example for mxGraph. This example demonstrates using
multiplicities for automatically validating a graph.
-->
<html>
<head>
<title>Validation 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
{
var xmlDocument = mxUtils.createXmlDocument();
var sourceNode = xmlDocument.createElement('Source');
var targetNode = xmlDocument.createElement('Target');
var subtargetNode = xmlDocument.createElement('Subtarget');
// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.setConnectable(true);
graph.setTooltips(true);
graph.setAllowDanglingEdges(false);
graph.setMultigraph(false);
// Source nodes needs 1..2 connected Targets
graph.multiplicities.push(new mxMultiplicity(
true, 'Source', null, null, 1, 2, ['Target'],
'Source Must Have 1 or 2 Targets',
'Source Must Connect to Target'));
// Source node does not want any incoming connections
graph.multiplicities.push(new mxMultiplicity(
false, 'Source', null, null, 0, 0, null,
'Source Must Have No Incoming Edge',
null)); // Type does not matter
// Target needs exactly one incoming connection from Source
graph.multiplicities.push(new mxMultiplicity(
false, 'Target', null, null, 1, 1, ['Source'],
'Target Must Have 1 Source',
'Target Must Connect From Source'));
// Enables rubberband selection
new mxRubberband(graph);
// Removes cells when [DELETE] is pressed
var keyHandler = new mxKeyHandler(graph);
keyHandler.bindKey(46, function(evt)
{
if (graph.isEnabled())
{
graph.removeCells();
}
});
// Installs automatic validation (use editor.validation = true
// if you are using an mxEditor instance)
var listener = function(sender, evt)
{
graph.validateGraph();
};
graph.getModel().addListener(mxEvent.CHANGE, listener);
// 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, sourceNode, 20, 20, 80, 30);
var v2 = graph.insertVertex(parent, null, targetNode, 200, 20, 80, 30);
var v3 = graph.insertVertex(parent, null, targetNode.cloneNode(true), 200, 80, 80, 30);
var v4 = graph.insertVertex(parent, null, targetNode.cloneNode(true), 200, 140, 80, 30);
var v5 = graph.insertVertex(parent, null, subtargetNode, 200, 200, 80, 30);
var v6 = graph.insertVertex(parent, null, sourceNode.cloneNode(true), 20, 140, 80, 30);
var e1 = graph.insertEdge(parent, null, '', v1, v2);
var e2 = graph.insertEdge(parent, null, '', v1, v3);
var e3 = graph.insertEdge(parent, null, '', v6, v4);
//var e4 = graph.insertEdge(parent, null, '', v1, v4);
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
}
};
</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:281px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>