2012-05-21 20:32:26 +00:00
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2013-10-28 08:56:36 +00:00
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Copyright (c) 2006-2013, JGraph Ltd
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2012-05-21 20:32:26 +00:00
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File I/O example for mxGraph. This example demonstrates reading an
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XML file, writing a custom parser, applying an automatic layout and
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defining a 2-way edge.
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-->
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<html>
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<head>
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<title>File I/O 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 = '../src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="../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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{
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// Checks if browser is supported
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if (!mxClient.isBrowserSupported())
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{
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// Displays an error message if the browser is
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// 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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{
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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graph.setEnabled(false);
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graph.setPanning(true);
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graph.setTooltips(true);
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graph.panningHandler.useLeftButtonForPanning = true;
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// Adds a highlight on the cell under the mousepointer
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new mxCellTracker(graph);
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// Changes the default vertex style in-place
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var style = graph.getStylesheet().getDefaultVertexStyle();
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style[mxConstants.STYLE_SHAPE] = mxConstants.SHAPE_ROUNDED;
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style[mxConstants.STYLE_PERIMETER] = mxPerimeter.RectanglePerimeter;
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style[mxConstants.STYLE_GRADIENTCOLOR] = 'white';
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style[mxConstants.STYLE_PERIMETER_SPACING] = 4;
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style[mxConstants.STYLE_SHADOW] = true;
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style = graph.getStylesheet().getDefaultEdgeStyle();
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style[mxConstants.STYLE_LABEL_BACKGROUNDCOLOR] = 'white';
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style = mxUtils.clone(style);
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style[mxConstants.STYLE_STARTARROW] = mxConstants.ARROW_CLASSIC;
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graph.getStylesheet().putCellStyle('2way', style);
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graph.isHtmlLabel = function(cell)
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{
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return true;
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};
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// Larger grid size yields cleaner layout result
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graph.gridSize = 20;
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// Creates a layout algorithm to be used
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// with the graph
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var layout = new mxFastOrganicLayout(graph);
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// Moves stuff wider apart than usual
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layout.forceConstant = 140;
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// Adds a button to execute the layout
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document.body.appendChild(mxUtils.button('Arrange',function(evt)
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{
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var parent = graph.getDefaultParent();
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layout.execute(parent);
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}));
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// Load cells and layouts the graph
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graph.getModel().beginUpdate();
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try
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{
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// Loads the custom file format (TXT file)
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parse(graph, 'fileio.txt');
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// Loads the mxGraph file format (XML file)
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//read(graph, 'fileio.xml');
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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var parent = graph.getDefaultParent();
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// Executes the layout
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layout.execute(parent);
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}
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finally
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{
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// Updates the display
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graph.getModel().endUpdate();
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}
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graph.dblClick = function(evt, cell)
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{
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var mxe = new mxEventObject(mxEvent.DOUBLE_CLICK, 'event', evt, 'cell', cell);
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this.fireEvent(mxe);
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if (this.isEnabled() &&
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!mxEvent.isConsumed(evt) &&
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!mxe.isConsumed() &&
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cell != null)
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{
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mxUtils.alert('Show properties for cell '+(cell.customId || cell.getId()));
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}
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};
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2012-12-18 13:09:38 +00:00
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if (mxClient.IS_QUIRKS)
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2012-05-21 20:32:26 +00:00
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{
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2012-12-18 13:09:38 +00:00
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document.body.style.overflow = 'hidden';
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2012-05-21 20:32:26 +00:00
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new mxDivResizer(container);
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}
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}
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};
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// Custom parser for simple file format
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function parse(graph, filename)
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{
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var model = graph.getModel();
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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var parent = graph.getDefaultParent();
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var req = mxUtils.load(filename);
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var text = req.getText();
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var lines = text.split('\n');
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// Creates the lookup table for the vertices
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var vertices = [];
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// Parses all lines (vertices must be first in the file)
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graph.getModel().beginUpdate();
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try
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{
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for (var i=0; i<lines.length; i++)
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{
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// Ignores comments (starting with #)
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var colon = lines[i].indexOf(':');
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if (lines[i].substring(0, 1) != "#" ||
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colon == -1)
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{
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var comma = lines[i].indexOf(',');
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var value = lines[i].substring(colon+2, lines[i].length);
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if (comma == -1 || comma > colon)
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{
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var key = lines[i].substring(0, colon);
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if (key.length > 0)
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{
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vertices[key] = graph.insertVertex(parent, null, value, 0, 0, 80, 70);
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}
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}
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else if (comma < colon)
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{
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// Looks up the vertices in the lookup table
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var source = vertices[lines[i].substring(0, comma)];
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var target = vertices[lines[i].substring(comma+1, colon)];
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if (source != null && target != null)
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{
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var e = graph.insertEdge(parent, null, value, source, target);
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// Uses the special 2-way style for 2-way labels
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if (value.indexOf('2-Way') >= 0)
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{
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e.style = '2way';
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}
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}
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}
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}
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}
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}
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finally
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{
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graph.getModel().endUpdate();
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}
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};
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// Parses the mxGraph XML file format
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function read(graph, filename)
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{
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var req = mxUtils.load(filename);
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var root = req.getDocumentElement();
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var dec = new mxCodec(root.ownerDocument);
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dec.decode(root, graph.getModel());
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};
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</script>
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</head>
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2012-07-20 10:35:30 +00:00
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<!-- Page passes the container for the graph to the program -->
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2012-12-18 13:09:38 +00:00
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<body onload="main(document.getElementById('graphContainer'))" style="margin:4px;">
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2012-05-21 20:32:26 +00:00
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<!-- Creates a container for the graph with a grid wallpaper. Make sure to define the position
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and overflow attributes! See comments on the adding of the size-listener on line 54 ff! -->
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<div id="graphContainer"
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2012-12-18 13:09:38 +00:00
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style="position:absolute;overflow:auto;top:36px;bottom:0px;left:0px;right:0px;border-top:gray 1px solid;">
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2012-05-21 20:32:26 +00:00
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</div>
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</body>
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</html>
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