maxGraph/javascript/examples/editing.html

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<!--
Copyright (c) 2006-2013, JGraph Ltd
Editing example for mxGraph. This example demonstrates using the in-place
editor trigger to specify the editing value and write the new value into
a specific field of the user object. Wrapping and DOM nodes as labels are
also demonstrated here.
-->
<html>
<head>
<title>Editing 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
{
// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.setHtmlLabels(true);
// Adds handling of return and escape keystrokes for editing
var keyHandler = new mxKeyHandler(graph);
// Helper method that returns the fieldname to be used for
// a mouse event
var getFieldnameForEvent = function(cell, evt)
{
if (evt != null)
{
// Finds the relative coordinates inside the cell
var point = mxUtils.convertPoint(graph.container,
mxEvent.getClientX(evt), mxEvent.getClientY(evt));
var state = graph.getView().getState(cell);
if (state != null)
{
point.x -= state.x;
point.y -= state.y;
// Returns second if mouse in second half of cell
if (point.y > state.height / 2)
{
return 'second';
}
}
}
return 'first';
};
// Returns a HTML representation of the cell where the
// upper half is the first value, lower half is second
// value
graph.getLabel = function(cell)
{
var table = document.createElement('table');
table.style.height = '100%';
table.style.width = '100%';
var body = document.createElement('tbody');
var tr1 = document.createElement('tr');
var td1 = document.createElement('td');
td1.style.textAlign = 'center';
td1.style.fontSize = '12px';
td1.style.color = '#774400';
mxUtils.write(td1, cell.value.first);
var tr2 = document.createElement('tr');
var td2 = document.createElement('td');
td2.style.textAlign = 'center';
td2.style.fontSize = '12px';
td2.style.color = '#774400';
mxUtils.write(td2, cell.value.second);
tr1.appendChild(td1);
tr2.appendChild(td2);
body.appendChild(tr1);
body.appendChild(tr2);
table.appendChild(body);
return table;
};
// Returns the editing value for the given cell and event
graph.getEditingValue = function(cell, evt)
{
evt.fieldname = getFieldnameForEvent(cell, evt);
return cell.value[evt.fieldname] || '';
};
// Sets the new value for the given cell and trigger
graph.labelChanged = function(cell, newValue, trigger)
{
var name = (trigger != null) ? trigger.fieldname : null;
if (name != null)
{
// Clones the user object for correct undo and puts
// the new value in the correct field.
var value = mxUtils.clone(cell.value);
value[name] = newValue;
newValue = value;
mxGraph.prototype.labelChanged.apply(this, arguments);
}
};
// Sample user objects with 2 fields
var value = new Object();
value.first = 'First value';
value.second = 'Second value';
// 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, value, 100, 60, 120, 80, 'overflow=fill;');
}
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'))">
<p>
Double-click the upper/lower half of the cell to edit different fields of the user object.
</p>
<!-- Creates a container for the graph with a grid wallpaper -->
<div id="graphContainer"
style="overflow:hidden;position:relative;width:321px;height:241px;background:url('editors/images/grid.gif')">
</div>
</body>
</html>