Disable (click) function based on condition

here the enableAddLink function looks like this in the typescript

enableAddLink() {
this.storyboard.network.addNodeMode = false;
this.addNodeMode = false;
this.addLinkMode = !this.addLinkMode;
this.storyboard.network.addLinkMode = this.addLinkMode;
}


The links should get created only when nodes exist else I want it to be disabled.

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