ForceDirectedLayout with ajax

@crohole wrote:

i have a code like this :

// This variation on ForceDirectedLayout does not move any selected Nodes
// but does move all other nodes (vertexes).
function ContinuousForceDirectedLayout() {
go.ForceDirectedLayout.call(this);
this._isObserving = false;
}
go.Diagram.inherit(ContinuousForceDirectedLayout, go.ForceDirectedLayout);

/** @override */
ContinuousForceDirectedLayout.prototype.isFixed = function(v) {
return v.node.isSelected;
}

// optimization: reuse the ForceDirectedNetwork rather than re-create it each time
/** @override */
ContinuousForceDirectedLayout.prototype.doLayout = function(coll) {
if (!this._isObserving) {
this._isObserving = true;
// cacheing the network means we need to recreate it if nodes or links have been added or removed or relinked,
// so we need to track structural model changes to discard the saved network.
var lay = this;
this.diagram.addModelChangedListener(function (e) {
// modelChanges include a few cases that we don't actually care about, such as
// "nodeCategory" or "linkToPortId", but we'll go ahead and recreate the network anyway.
// Also clear the network when replacing the model.
if (e.modelChange !== "" ||
(e.change === go.ChangedEvent.Transaction && e.propertyName === "StartingFirstTransaction")) {
lay.network = null;
}
});
}
var net = this.network;
if (net === null) { // the first time, just create the network as normal
this.network = net = this.makeNetwork(coll);
} else { // but on reuse we need to update the LayoutVertex.bounds for selected nodes
this.diagram.nodes.each(function (n) {
var v = net.findVertex(n);
if (v !== null) v.bounds = n.actualBounds;
});
}
// now perform the normal layout
go.ForceDirectedLayout.prototype.doLayout.call(this, coll);
// doLayout normally discards the LayoutNetwork by setting Layout.network to null;
// here we remember it for next time
this.network = net;
}
// end ContinuousForceDirectedLayout

if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;  // for conciseness in defining templates

myDiagram =
  $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
    {
	  "toolManager.mouseWheelBehavior": go.ToolManager.WheelZoom,
      initialAutoScale: go.Diagram.Uniform,  // an initial automatic zoom-to-fit
      contentAlignment: go.Spot.Center,  // align document to the center of the viewport
      layout:
        $(ContinuousForceDirectedLayout,  // automatically spread nodes apart while dragging
          { defaultSpringLength: 30, defaultElectricalCharge: 100 }),
      // do an extra layout at the end of a move
      "SelectionMoved": function(e) { e.diagram.layout.invalidateLayout(); }
    });

// dragging a node invalidates the Diagram.layout, causing a layout during the drag
myDiagram.toolManager.draggingTool.doMouseMove = function() {
  go.DraggingTool.prototype.doMouseMove.call(this);
  if (this.isActive) { this.diagram.layout.invalidateLayout(); }
}

// define each Node's appearance
myDiagram.nodeTemplate =
  $(go.Node, "Auto",
	{ isTreeExpanded: false },// the whole node panel
    // define the node's outer shape, which will surround the TextBlock
    $(go.Shape, "RoundedRectangle",
      { fill: "CornflowerBlue", stroke: "black", spot1: new go.Spot(0, 0, 5, 5), spot2: new go.Spot(1, 1, -5, -5) },
	  new go.Binding("fill","warna")),
    $(go.TextBlock,
      { font: "bold 10pt helvetica, bold arial, sans-serif", textAlign: "left"},
      new go.Binding("text", "text")),
	  $("TreeExpanderButton",
			{alignment: go.Spot.MiddleTop, alignmentFocus: go.Spot.Top },
			{visible: true}
		)
  );
// the rest of this app is the same as samples/conceptMap.html

myDiagram.layout = $(go.ForceDirectedLayout);

// replace the default Link template in the linkTemplateMap
myDiagram.linkTemplate =
  $(go.Link,  // the whole link panel
    $(go.Shape,  // the link shape
      { stroke: "black", strokeWidth: 2 }),
    $(go.Shape,  // the arrowhead
      { fromArrow: "BackwardOpenTriangle", stroke: "black", fill: "black" }),
    $(go.Panel, "Auto",
      $(go.Shape,  // the label background, which becomes transparent around the edges
        { fill: $(go.Brush, "Radial", { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
          stroke: null }),
      $(go.TextBlock,  // the label text
        { textAlign: "center",
          font: "10pt helvetica, arial, sans-serif",
          stroke: "#555555",
          margin: 4 },
        new go.Binding("text", "text"))
    )
  );

// create the model for the concept map
var nodeDataArray = [
{ key: 1, text: "Concept Maps" },
{ key: 2, text: "Organized Knowledge" },
{ key: 3, text: "Context Dependent" },
{ key: 4, text: "Concepts" },
{ key: 5, text: "Propositions" },
{ key: 6, text: "Associated Feelings or Affect" },
{ key: 7, text: "Perceived Regularities" },
{ key: 8, text: "Labeled" },
{ key: 9, text: "Hierarchically Structured" },
{ key: 10, text: "Effective Teaching" },
{ key: 11, text: "Crosslinks" },
{ key: 12, text: "Effective Learning" },
{ key: 13, text: "Events (Happenings)" },
{ key: 14, text: "Objects (Things)" },
{ key: 15, text: "Symbols" },
{ key: 16, text: "Words" },
{ key: 17, text: "Creativity" },
{ key: 18, text: "Interrelationships" },
{ key: 19, text: "Infants" },
{ key: 20, text: "Different Map Segments" }
];
var linkDataArray = [
{ from: 1, to: 2, text: "represent" },
{ from: 2, to: 3, text: "is" },
{ from: 2, to: 4, text: "is" },
{ from: 2, to: 5, text: "is" },
{ from: 2, to: 6, text: "includes" },
{ from: 2, to: 10, text: "necessary\nfor" },
{ from: 2, to: 12, text: "necessary\nfor" },
{ from: 4, to: 5, text: "combine\nto form" },
{ from: 4, to: 6, text: "include" },
{ from: 4, to: 7, text: "are" },
{ from: 4, to: 8, text: "are" },
{ from: 4, to: 9, text: "are" },
{ from: 5, to: 9, text: "are" },
{ from: 5, to: 11, text: "may be" },
{ from: 7, to: 13, text: "in" },
{ from: 7, to: 14, text: "in" },
{ from: 7, to: 19, text: "begin\nwith" },
{ from: 8, to: 15, text: "with" },
{ from: 8, to: 16, text: "with" },
{ from: 9, to: 17, text: "aids" },
{ from: 11, to: 18, text: "show" },
{ from: 12, to: 19, text: "begins\nwith" },
{ from: 17, to: 18, text: "needed\nto see" },
{ from: 18, to: 20, text: "between" }
];
myDiagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);

can I get the node data and link data with ajax when TreeExpanderButton is click?

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