<!--
Copyright (c) 2006-2013, JGraph Ltd
HTML label example for mxGraph. This example demonstrates using
HTML labels that are connected to the state of the user object.
-->
<html>
<head>
<title>HTML label 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 HTML labels
graph.setHtmlLabels(true);
// Enables rubberband selection
new mxRubberband(graph);
// Creates a user object that stores the state
var doc = mxUtils.createXmlDocument();
var obj = doc.createElement('UserObject');
obj.setAttribute('label', 'Hello, World!');
obj.setAttribute('checked', 'false');
// Adds optional caching for the HTML label
var cached = true;
if (cached)
{
// Ignores cached label in codec
mxCodecRegistry.getCodec(mxCell).exclude.push('div');
// Invalidates cached labels
graph.model.setValue = function(cell, value)
{
cell.div = null;
mxGraphModel.prototype.setValue.apply(this, arguments);
};
}
// Overrides method to provide a cell label in the display
graph.convertValueToString = function(cell)
{
if (cached && cell.div != null)
{
// Uses cached label
return cell.div;
}
else if (mxUtils.isNode(cell.value) && cell.value.nodeName.toLowerCase() == 'userobject')
{
// Returns a DOM for the label
var div = document.createElement('div');
div.innerHTML = cell.getAttribute('label');
mxUtils.br(div);
var checkbox = document.createElement('input');
checkbox.setAttribute('type', 'checkbox');
if (cell.getAttribute('checked') == 'true')
{
checkbox.setAttribute('checked', 'checked');
checkbox.defaultChecked = true;
}
// Writes back to cell if checkbox is clicked
mxEvent.addListener(checkbox, (mxClient.IS_QUIRKS) ? 'click' : 'change', function(evt)
{
var elt = cell.value.cloneNode(true);
elt.setAttribute('checked', (checkbox.checked) ? 'true' : 'false');
graph.model.setValue(cell, elt);
});
div.appendChild(checkbox);
if (cached)
{
// Caches label
cell.div = div;
}
return div;
}
return '';
};
// Overrides method to store a cell label in the model
var cellLabelChanged = graph.cellLabelChanged;
graph.cellLabelChanged = function(cell, newValue, autoSize)
{
if (mxUtils.isNode(cell.value) && cell.value.nodeName.toLowerCase() == 'userobject')
{
// Clones the value for correct undo/redo
var elt = cell.value.cloneNode(true);
elt.setAttribute('label', newValue);
newValue = elt;
}
cellLabelChanged.apply(this, arguments);
};
// Overrides method to create the editing value
var getEditingValue = graph.getEditingValue;
graph.getEditingValue = function(cell)
{
if (mxUtils.isNode(cell.value) && cell.value.nodeName.toLowerCase() == 'userobject')
{
return cell.getAttribute('label');
}
};
var parent = graph.getDefaultParent();
graph.insertVertex(parent, null, obj, 20, 20, 80, 60);
// Undo/redo
var undoManager = new mxUndoManager();
var listener = function(sender, evt)
{
undoManager.undoableEditHappened(evt.getProperty('edit'));
};
graph.getModel().addListener(mxEvent.UNDO, listener);
graph.getView().addListener(mxEvent.UNDO, listener);
document.body.appendChild(mxUtils.button('Undo', function()
{
undoManager.undo();
}));
document.body.appendChild(mxUtils.button('Redo', function()
{
undoManager.redo();
}));
}
};
</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>