I would like to dynamically load the sub-items of a TreeList whenever the triangle infront of an element is clicked to open the sub-item and then fetch the sub-items from an API. I guess I need to use the onExpandChange event for this, correct? Do you have an example on how I would have to extend the original tree when the sub-items have loaded?
Any hints would be greatly appreciated.
Thanks,
Bernd
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Hello, Bernd,
You can load the nested items when a TreeView rows are expanded by implementing a similar approach:
As assumed by you, the items in the sample above are fetched each time an expand icon is clicked by handling the onExpandChange event. Please, give this suggestion a try and let me know in case I can assist you any further on this matter.
Regards,
Vessy
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Hi Vessy.
Thanks for the example. That's what I thought and I'll go from there and try it out.
Great support as always. :-)
Greetings,
Bernd
You are most welcome, Bernd :)
Thanks a lot for the kind words!
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Hi again.
I tried it out now and there is one more issue left for me. As I said, I want to load the sub-items of an item when the user clicks on the little triangle to expand the item. The issue is though, that if there are no sub-items in the items field, then the triangle doesn't show up, so the user of course can't click on it to load them. I would have to add a dummy item into each items field array to make this somehow possible and then replace the dummy field when the "real" sub-items are loaded but that seems to be a hacky "solution" to me. Is ther any way I can switch on the triangle without adding anything to the items field array?
Thanks,
Bernd
Hi, Bernd,
Your assumption is correct - adding a dummy child item is the only way to trigger the arrow of the nodes with the current implementation of the TreeList.
Regards,
Vessy