How to use angularjs to create a tree drop down list?

When you click on parent category should be sent a request to the server to retrieve data for child elements, and create new drop-down list.
July 9th 19 at 10:09
2 answers
July 9th 19 at 10:11
July 9th 19 at 10:13
When you click on the parent category

transmit to the server its ID
to retrieve data for child elements

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