GroupTemplate fromSpot, toSpot are not updated

@vietthang wrote:

Hi,

I have created a diagram and define a groupTemplate and have a function to update the graph Direction and the fromSpot toSpot of upcoming/incoming link:

changeLayoutDirection(event) {
        this.goDiagram.startTransaction('change Layout');
        const orientation = this.selectedDirection.orientation;
        this.goDiagram.layout.direction = this.selectedDirection.layoutDirection;
   
        if (orientation === GraphDataConstants.SOURCE_ON_LEFT) {
            this.goDiagram.groupTemplate.fromSpot = go.Spot.Right;
            this.goDiagram.groupTemplate.toSpot = go.Spot.Left;
        } else if (orientation === GraphDataConstants.SOURCE_ON_RIGHT) {
            this.goDiagram.groupTemplate.fromSpot = go.Spot.Left;
            this.goDiagram.groupTemplate.toSpot = go.Spot.Right;
        } else if (orientation === GraphDataConstants.SOURCE_ON_TOP) {
            this.goDiagram.groupTemplate.fromSpot = go.Spot.Bottom;
            this.goDiagram.groupTemplate.toSpot = go.Spot.Top;
        } else {
            this.goDiagram.groupTemplate.fromSpot = go.Spot.Top;
            this.goDiagram.groupTemplate.toSpot = go.Spot.Bottom;
        }
        this.goDiagram.groupTemplate = this.graphDataGoService.groupTemplate;
             this.goDiagram.commitTransaction('change Layout');
    }

The problem here is that: the direction is updated, but fromSpot/toSpot still keeps the predefined value: From right side to left side of each node:

Before:

After calling changeLayout function:

Is there anything wrong with my function?

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