Unable to access the actual tooltip text when using a template binding

GoJS
1

I’m attempting to do a test of tooltip text on a node. The tooltip is set up with two elements (see below), the second of which is the TextBlock. I’m accessing the text via node.toolTip.elements[1].text. What I see is an empty string text property. I can see the binding description under the property localBindings, but I don’t seem to be access the result of binding. The tooltip is actually working just fine for manual checks in the UI. but I want to be able to do it in an automated test.
The only way I can get the text property populated is by uncommenting the text line in the TextBlock definition.
How do I access the result of text derived from a binding?

	public getToolTip(fieldName: string): Object {
		return {
			toolTip:
				this.$(go.Adornment, 'Auto',
					this.$(go.Shape, {
						fill: this.tooltipStyle.getPropertyValue('fill'),
					}),
					this.$(go.TextBlock, {
						margin: new go.Margin(6),
						font: StyleHelper.getFont(this.tooltipStyle),
						//text: "DEFAULT TEXT"
					},
					new go.Binding('text', fieldName))
				)  // end of Adornment
		};
	}
2

Is the tooltip actually visible at the time that you evaluate: node.toolTip.elements[1].text ?

3

No. So the text property is only bound when the tooltip is visible?

4

Just tried it with a delay, and that does indeed bring up the proper text when the tooltip is visible.

5

The process of adding any Adornment to the Diagram will also set its data property and evaluate all of its Bindings.

6

As a follow up to this, when the tooltip is too long for a single line I would expect to wrap, but this isn’t happening. Looking at the docs the default is for maxLines=Infinity and wrap=TextBlock.WrapDesiredSize. I also tried wrap=TextBlock.WrapFit. I’ve also tried explicitly setting isMultiline=true and maxLines=Infinity. Is this a quirk for tooltips or is something else going on?

7

There needs to be some constraint on the width of the TextBlock for it to wrap if needed.