The functionality of Angular 6 Material Nested Tree is disrupted when attempting to use dynamic data

In Angular 6, I am utilizing mat-tree along with mat-nested-tree-node. My objective is to dynamically load the data when the user toggles the expand icon.

Attempting to apply the dynamic data concept from the Flat Tree example provided in Material Examples, I have endeavored to implement a similar approach for the Nested Tree. You can view what I have done so far at https://stackblitz.com/edit/angular-naarcp.

However, despite the console indicating that the data is being updated, only the prepopulated data in the array is displayed on the UI. It consistently calls the _getChildren method for the initial nodes parent, child1, child2, child3. Although I add My Child under child1 and child3 when expanded by the user, the added node does not appear.

The limitation lies in not being able to include dynamic children within the _getChildren, as it recurs until reaching the last node.

Note:

I prefer not to use the Flat tree due to its management of everything in a single array, making it cumbersome to update asynchronously loaded data.

Seeking Help

Am I overlooking something, or are nested trees inherently designed to function this way?

Answer №1

When I first tried implementing this, I faced challenges with the UI not updating due to a lack of change detection for object property changes. Take a look at my original question and answer linked below, especially if you're working with a flattened tree structure - it could save you from hours of frustration.

Discover why my Angular application slowed down after updating data in a Mat-tree

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