<!--
Copyright (c) 2006-2013, JGraph Ltd
Groups example for mxGraph. This example demonstrates using
cells as parts of other cells.
-->
<html>
<head>
<title>Hello, World! 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">
// Overrides check for valid roots
mxGraph.prototype.isValidRoot = function()
{
return false;
};
// Don't clear selection if multiple cells selected
var graphHandlerMouseDown = mxGraphHandler.prototype.mouseDown;
mxGraphHandler.prototype.mouseDown = function(sender, me)
{
graphHandlerMouseDown.apply(this, arguments);
if (this.graph.isCellSelected(me.getCell()) && this.graph.getSelectionCount() > 1)
{
this.delayedSelection = false;
}
};
// Selects descendants before children selection mode
var graphHandlerGetInitialCellForEvent = mxGraphHandler.prototype.getInitialCellForEvent;
mxGraphHandler.prototype.getInitialCellForEvent = function(me)
{
var model = this.graph.getModel();
var psel = model.getParent(this.graph.getSelectionCell());
var cell = graphHandlerGetInitialCellForEvent.apply(this, arguments);
var parent = model.getParent(cell);
if (psel == null || (psel != cell && psel != parent))
{
while (!this.graph.isCellSelected(cell) && !this.graph.isCellSelected(parent) &&
model.isVertex(parent) && !this.graph.isValidRoot(parent))
{
cell = parent;
parent = this.graph.getModel().getParent(cell);
}
}
return cell;
};
// Selection is delayed to mouseup if child selected
var graphHandlerIsDelayedSelection = mxGraphHandler.prototype.isDelayedSelection;
mxGraphHandler.prototype.isDelayedSelection = function(cell)
{
var result = graphHandlerIsDelayedSelection.apply(this, arguments);
var model = this.graph.getModel();
var psel = model.getParent(this.graph.getSelectionCell());
var parent = model.getParent(cell);
if (psel == null || (psel != cell && psel != parent))
{
if (!this.graph.isCellSelected(cell) && model.isVertex(parent) && !this.graph.isValidRoot(parent))
{
result = true;
}
}
return result;
};
// Delayed selection of parent group
mxGraphHandler.prototype.selectDelayed = function(me)
{
var cell = me.getCell();
if (cell == null)
{
cell = this.cell;
}
var model = this.graph.getModel();
var parent = model.getParent(cell);
while (this.graph.isCellSelected(cell) && model.isVertex(parent) && !this.graph.isValidRoot(parent))
{
cell = parent;
parent = model.getParent(cell);
}
this.graph.selectCellForEvent(cell, me.getEvent());
};
// Returns last selected ancestor
mxPopupMenuHandler.prototype.getCellForPopupEvent = function(me)
{
var cell = me.getCell();
var model = this.graph.getModel();
var parent = model.getParent(cell);
while (model.isVertex(parent) && !this.graph.isValidRoot(parent))
{
if (this.graph.isCellSelected(parent))
{
cell = parent;
}
parent = model.getParent(parent);
}
return cell;
};
// 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
{
// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.constrainChildren = false;
graph.extendParents = false;
graph.extendParentsOnAdd = false;
// Uncomment the following if you want the container
// to fit the size of the graph
//graph.setResizeContainer(true);
// 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, 120, 60);
var v2 = graph.insertVertex(v1, null, 'World!', 90, 20, 60, 20);
}
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="overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>