102 lines
4.0 KiB
HTML
102 lines
4.0 KiB
HTML
<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Backend example for mxGraph. This example demonstrates using
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AJAX to open and save XML from a .NET backend.
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-->
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<html>
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<head>
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<title>Backend example for mxGraph</title>
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<!-- Sets the basepath for the library if not in same directory -->
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<script type="text/javascript">
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mxBasePath = '/mxgraph/javascript/src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="/mxgraph/javascript/src/js/mxClient.js"></script>
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<!-- Example code -->
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<script type="text/javascript">
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// Program starts here. Creates a sample graph in the
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// DOM node with the specified ID. This function is invoked
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// from the onLoad event handler of the document (see below).
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function main(container) {
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// Checks if the browser is supported
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if (!mxClient.isBrowserSupported()) {
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// Displays an error message if the browser is not supported.
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mxUtils.error('Browser is not supported!', 200, false);
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}
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else {
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// Disables the built-in context menu
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mxEvent.disableContextMenu(container);
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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// Opens a file from the backend
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document.body.appendChild(mxUtils.button('Open', function () {
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// Asks for dummy file ID to demonstrate handling of IDs in general
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var id = mxUtils.prompt('Enter file ID');
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mxUtils.get('Backend.ashx?id=' + encodeURIComponent(id), function (req) {
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var node = req.getDocumentElement();
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var dec = new mxCodec(node.ownerDocument);
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dec.decode(node, graph.getModel());
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// Stores ID for saving
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graph.id = id;
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});
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}));
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// Saves a file to the backend
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document.body.appendChild(mxUtils.button('Save', function () {
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if (graph.id == null) {
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mxUtils.alert('No open file');
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}
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else {
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var enc = new mxCodec();
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var node = enc.encode(graph.getModel());
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var xml = mxUtils.getXml(node);
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mxUtils.post('Backend.ashx?id=' + encodeURIComponent(graph.id), 'xml=' + encodeURIComponent(xml), function () {
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mxUtils.alert('Saved');
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}, function () {
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mxUtils.alert('Error');
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});
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}
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}));
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}
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};
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</script>
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</head>
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<!-- Page passes the container for the graph to the program -->
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<body onload="main(document.getElementById('graphContainer'))">
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<!-- Creates a container for the graph with a grid wallpaper -->
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<div id="graphContainer"
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style="position:relative;overflow:hidden;width:321px;height:241px;background:url('mxgraph/javascript/examples/editors/images/grid.gif');cursor:default;">
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</div>
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<!--Ignore this. Just checks for the /mxgraph virtual directory. -->
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<div style="border: solid 1px black;background:red;display:none;padding:10px;width:60%;" id="warning">
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<h3>Warning: Virtual Directory /mxgraph not found!</h3>
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<p>
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A virtual directory (<code>/mxgraph</code>) that points to the top-level
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directory of the mxGraph distribution is required in IIS for these examples
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to work. This virtual directory must be manually created using the IIS Manager.
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</p>
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</div>
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<script type="text/javascript">
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// Checks if the virtual directory exists by loading an image that should be in
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// the virtual directory. If the image cannot be found then a warning is shown.
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var image = new Image();
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image.onerror = function () {
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document.getElementById('warning').style.display = '';
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}
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image.src = '/mxgraph/javascript/src/images/transparent.gif';
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</script>
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</body>
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</html>
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