LinkDrawn Event Not Firing

GoJS
1

I am using the pipes example. I insert a LinkDrawn listener:

myDiagram.addDiagramListener("Modified", function(e) {
  var button = document.getElementById("SaveButton");
  if (button) button.disabled = !myDiagram.isModified;
  var idx = document.title.indexOf("*");
  if (myDiagram.isModified) {
    if (idx < 0) document.title += "*";
  } else {
    if (idx >= 0) document.title = document.title.substr(0, idx);
  }
});
myDiagram.addDiagramListener("LinkDrawn", function(e){
	console.log(e);
});
myDiagram.addDiagramListener("LinkRelinked",  function(e){
	console.log(e);
});

expecting that when two pipes are linked the event will fire and I can then update other pertinent data. No go. Bug or is this a result of the insertLink not calling the LinkDrawn event by design?

What is the best way around this?

Thanks!

2

“LinkDrawn” only fires from the LinkingTool, not for any Link that gets created.

You’ll probably need to use a more general model changed listener and look for changes to "linkDataArray", depending on your aim.

Start with something like:

  myDiagram.addModelChangedListener(onModelChanged);
  
  function onModelChanged(e) {  // handle insertions
    if (e.model.skipsUndoManager) return;
    if (e.change === go.ChangedEvent.Insert) {
      if (e.propertyName === "nodeDataArray") {
        // do something with e.newValue
      } else if (e.propertyName === "linkDataArray") {
        // do something with e.newValue
      }
    }
  }