expand not working on first time

Hi,

When adding a new node to tree it is not expanding when the parent node has been empty, but when there are children then it works. See the video: https://www.useloom.com/share/ce8709b4a27448e7a2eb0f56bbc92ad2

addLevel(parent) {
    let newLevel = {
      level_id: parent.data.id,
      name: parent.data.name + " copy",
    };

    this.levelService.addLevel(newLevel)
      .then(level => {
        parent.data.children = parent.data.children || [];
        parent.data.children.push(level.data);
        this.tree.treeModel.update();
        parent.expand();
      });
  }

<tree-root [nodes]="levels" [options]="treeOptions"
        (moveNode)="onMoveNode($event)"
        (activate)="onActivate($event)"
        (deactivate)="onDeactivate($event)"
        (event)="onEvent($event)"
      >
        <ng-template #treeNodeTemplate let-node="node" let-index="index">
          <div class="level">
            {{ node.data.name }}
            <button class="btn btn-sm btn-success float-right" (click)="addLevel(node)"><i class="fa fa-plus"></i></button>
          </div>

        </ng-template>
      </tree-root>

[thienedits]

This is what worked for me

parentNode: TreeNode;
@ViewChild('tree') tree: TreeComponent;

ngAfterViewChecked() {
        //If parentNode exists
        if(this.parentNode) {
                //If node exists in treeModel
                if (this.tree.treeModel.getNodeById(this.parentNode.data.id)) {
                    this.tree.treeModel.getNodeById(this.parentNode.data.id).expand();
                }
        }
    }

addLevel(parent) {
   this.parentNode = parent;
}

It looks like you have to use one of the angular lifecycle after the view is rendered. Then inside there you can get the treeModel to get the node by id and call expand().

[tobiasengelhardt]

Closing this issue due to inactivity. Please open a new issue if the problem still exists.