Undefined issue when deleting a node that is locked onto

[T1mmos]

Hi,

I spent some time investigating an issue where deleting a node from the network leads to an error.

After adding a node, I want to focus on it. This is how my code goes:

    if (id && id != '') {
      var options: FocusOptions = {
        locked: true,    // <------------ this one causes the bug, I think
        scale: 1.0,
        animation: {
          duration: 1000,
          easingFunction: 'easeOutQuart',
        },
      };
      this.network.focus(id, options);
    }

Then, later, when I delete the node, I get this error:

TypeError: Cannot read properties of undefined (reading 'x')
    at t.value (vis-network.min.js:32:264102)
    at e.emit (vis-network.min.js:26:13475)
    at t.value (vis-network.min.js:32:246367)
    at aI.<anonymous> (vis-network.min.js:32:244488)
    at e.emit (vis-network.min.js:26:13475)
    at t.value (vis-network.min.js:32:218389)
    at aI.<anonymous> (vis-network.min.js:32:215892)
    at e.emit (vis-network.min.js:26:13475)
    at aI.<anonymous> (vis-network.min.js:32:382434)
    at e.emit (vis-network.min.js:26:13475)

Top of this stack trace takes me to this code in vis-network.min.js:

... function(){var t=this.body.nodes[this.lockedOnNodeId].x

Therefore I thought, this must have something to do with the node locking feature.

The error is there when deleting using this.network.deleteSelected(), also when using the node dataset this.nodes.remove(...), deleting a node is simply impossible. What did work is using this.network.setData(...) which is obviously not something you want to do.

💡 In the code above, when I set "locked" to false, the issue does no longer appear. This is the only workaround I have found (fix in my case, don't really need the locking feature).