How to change the fill color of shape?

@tesicg wrote:

Hello,

I'm playing with GoJS and in this sample:

http://gojs.net/latest/samples/logicCircuit.html

in this part of code:

// define templates for each type of node
var inputTemplate =
  $(go.Node, "Spot", nodeStyle(),
    $(go.Shape, "Circle", shapeStyle(),
      { fill: blue }),  // override the default fill (from shapeStyle()) to be red
    $(go.Shape, "Rectangle", portStyle(false),  // the only port
      { portId: "", alignment: new go.Spot(1, 0.5) }),
    { // if double-clicked, an input node will change its value, represented by the color.
        doubleClick: function (e, obj) {
            e.diagram.startTransaction("Toggle Input");
            var shp = obj.findObject("NODESHAPE");
            shp.fill = (shp.fill === green) ? red : green;
            updateStates();
            e.diagram.commitTransaction("Toggle Input");
        }
    }
  );

I've changed "red" to "blue" and when I ran my application I've got 2 empty rectangles. It means there is no elements in panel on the left side and I can't drag anything from left to right side.

How to change the fill color?

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