<title>mxGraph using Server-side Image</title>

<!-- Sets the basepath for the library if not in same directory -->

<script type="text/javascript">

mxBasePath = '/mxgraph/javascript/src';

</script>

<!-- Loads and initializes the library -->

<script type="text/javascript" src="/mxgraph/javascript/src/js/mxClient.js"></script>

<!-- Overrides certain methods required for the server-side-image to be used. -->

<script type="text/javascript">

// Makes the background of the in-place editor non-transparent

var previousStartEditing = mxCellEditor.prototype.startEditing;

mxCellEditor.prototype.startEditing = function (cell, trigger)

{

previousStartEditing.apply(this, arguments);

var state = this.graph.getView().getState(cell);

if (state != null)

{

var color = mxUtils.getValue(state.style, mxConstants.STYLE_FILLCOLOR, 'white');

this.textarea.style.background = color;

}

};

// Replaces the event firing mechanism in the graph view since there are

// no longer any DOM elements that fire events for the actual states we

// have to find the state under the mouse using graph.getCellAt and then

// fire the event for the state from here instead.

// FIXME: Since we do not render the label we don't have the label bounds

// here which means hit detection will only work for the vertex bounds,

// the edge but not for overlapping labels or most part of the edge labels.

mxGraphView.prototype.installListeners = function()

{

var graph = this.graph;

var container = graph.container;

if (container != null)

{

mxEvent.addGestureListeners(container,

mxUtils.bind(this, function(evt)

{

var pt = mxUtils.convertPoint(graph.container,

mxEvent.getClientX(evt), mxEvent.getClientY(evt));

var cell = graph.getCellAt(pt.x, pt.y);

var state = this.getState(cell);

if (state != null)

{

graph.fireMouseEvent(mxEvent.MOUSE_DOWN,

new mxMouseEvent(evt, state));

}

// Condition to avoid scrollbar events starting a rubberband

// selection

else if (this.isContainerEvent(evt) &&

((!mxClient.IS_IE &&

!mxClient.IS_GC && !mxClient.IS_OP && !mxClient.IS_SF) ||

!this.isScrollEvent(evt)))

{

graph.fireMouseEvent(mxEvent.MOUSE_DOWN,

new mxMouseEvent(evt));

}

}),

mxUtils.bind(this, function(evt)

{

var pt = mxUtils.convertPoint(graph.container,

mxEvent.getClientX(evt), mxEvent.getClientY(evt));

var cell = graph.getCellAt(pt.x, pt.y);

var state = this.getState(cell);

if (state != null)

{

graph.fireMouseEvent(mxEvent.MOUSE_MOVE,

new mxMouseEvent(evt, state));

}

else if (this.isContainerEvent(evt))

{

graph.fireMouseEvent(mxEvent.MOUSE_MOVE,

new mxMouseEvent(evt));

}

}),

mxUtils.bind(this, function(evt)

{

var pt = mxUtils.convertPoint(graph.container,

mxEvent.getClientX(evt), mxEvent.getClientY(evt));

var cell = graph.getCellAt(pt.x, pt.y);

var state = this.getState(cell);

if (state != null)

{

graph.fireMouseEvent(mxEvent.MOUSE_UP,

new mxMouseEvent(evt, state));

}

else if (this.isContainerEvent(evt))

{

graph.fireMouseEvent(mxEvent.MOUSE_UP,

new mxMouseEvent(evt));

}

}));

// Adds listener for double click handling on background

mxEvent.addListener(container, 'dblclick',

mxUtils.bind(this, function(evt)

{

var pt = mxUtils.convertPoint(graph.container,

mxEvent.getClientX(evt), mxEvent.getClientY(evt));

var cell = graph.getCellAt(pt.x, pt.y);

graph.dblClick(evt, cell);

})

);

// Adds basic listeners for graph event dispatching outside of the

// container and finishing the handling of a single gesture

mxEvent.addGestureListeners(document,

mxUtils.bind(this, function(evt)

{

if (this.isContainerEvent(evt))

{

graph.popupMenuHandler.hideMenu();

}

}),

mxUtils.bind(this, function(evt)

{

// Hides the tooltip if mouse is outside container

if (graph.tooltipHandler != null &&

graph.tooltipHandler.isHideOnHover())

{

graph.tooltipHandler.hide();

}

if (this.captureDocumentGesture &&

graph.isMouseDown &&

!mxEvent.isConsumed(evt))

{

graph.fireMouseEvent(mxEvent.MOUSE_MOVE,

new mxMouseEvent(evt));

}

}),

mxUtils.bind(this, function(evt)

{

if (this.captureDocumentGesture)

{

graph.fireMouseEvent(mxEvent.MOUSE_UP,

new mxMouseEvent(evt));

}

})

);

}

};

</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);

// Holds the current image

var img = null;

var loader = new Image();

loader.src = 'images/loading.gif';

loader.style.zIndex = 1;

loader.style.visibility = 'hidden';

loader.style.position = 'absolute';

graph.container.insertBefore(loader, graph.container.firstChild);

// Disables the DOM-based rendering in the graph and updates the

// display image on each validation step using the Export servlet

// on the graph

graph.view.rendering = false;

// Installs a post-validation repaint of the complete graph

graph.view.validate = function()

{

loader.style.left = graph.container.scrollLeft + graph.container.clientWidth / 2 - 32;

loader.style.top = graph.container.scrollTop + graph.container.clientHeight / 2 - 32;

loader.style.visibility = 'visible';

mxGraphView.prototype.validate.apply(this, arguments);

var t0 = new Date().getTime();

var bounds = graph.getGraphBounds();

// Note that we send out an XML version of the view which

// allows us to keep most customizations on the client-side.

// No deltas are used here, the complete view is sent to the

// server on each update.

var node = mxUtils.getViewXml(graph, 1);

var xml = encodeURIComponent(mxUtils.getXml(node));

var onload = function(req)

{

var dt = (new Date().getTime() - t0) / 1000;

//mxLog.debug('post returned after '+dt+' secs');

if (req.getStatus() == 200)

{

var image =new Image();

// Disable DnD events on images in IE. FIXME: Rubberband

// events are ignored in IE when starting on the image.

if (mxClient.IS_IE)

{

graph.view.isContainerEvent = function(evt)

{

var source = mxEvent.getSource(evt);

return (source == image ||

source == this.graph.container ||

source.parentNode == this.backgroundPane ||

(source.parentNode != null &&

source.parentNode.parentNode == this.backgroundPane) ||

source == this.canvas.parentNode ||

source == this.canvas ||

source == this.backgroundPane ||

source == this.drawPane ||

source == this.overlayPane);

};

}

// Less flickering if the old image is removed after

// the new image was received from the server

image.onload = function()

{

if (img != null)

{

img.parentNode.removeChild(img);

}

img = image;

graph.container.insertBefore(img, graph.container.firstChild);

loader.style.visibility = 'hidden';

var dt = (new Date().getTime() - t0) / 1000;

//mxLog.debug('received '+img.clientWidth+'x'+img.clientHeight+' pixels in '+dt+' secs');

graph.setEnabled(true);

};

// URL contains timestamp to avoid caching in the browser

image.src = '/ServerView?'+new Date().getTime();

image.style.position = 'absolute';

image.style.left = bounds.x - 4;

image.style.top = bounds.y - 4;

image.style.zIndex = -1;

}

};

var onerror = function(req)

{

//mxLog.debug('error: '+req.getStatus());

}

//mxLog.debug('sent '+(xml.length/1024)+' KB');

graph.setEnabled(false);

new mxXmlRequest('/ServerView', 'xml='+xml).send(onload, onerror);

};

// Uncomment the following if you want the container

// to fit the size of the graph

//graph.setResizeContainer(true);

// Enables rubberband selection

new mxRubberband(graph);

graph.setConnectable(true);

graph.setPanning(true);

graph.setTooltips(true);

// Gets the default parent for inserting new cells. This

// is normally the first child of the root (ie. layer 0).

var parent = graph.getDefaultParent();

//mxLog.show();

// Adds cells to the model in a single step

graph.getModel().beginUpdate();

try

{

var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);

var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);

var e1 = graph.insertEdge(parent, null, '', v1, v2);

}

finally

{

// Updates the display

graph.getModel().endUpdate();

}

}

};

</script>

<body onload="main(document.getElementById('graphContainer'))">

<div id="graphContainer"

style="overflow:auto;width:500px;height:500px;border: black solid 1px;cursor:default;">

<strong>Important:</strong>

To use this example, start com.mxgraph.examples.web.Main in Java

and point your<br>browser to:

<a href="http://localhost:8080/mxgraph/javascript/examples/serverview.html">http://localhost:8080/mxgraph/javascript/examples/serverview.html</a>