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Bind a change event handler and populate second select tag based on selected value.
Php code is executed before any page content is shown or any javascript is executed, and not exactly sequentially as you see it in your example.
What you want is probably to create...
Use DOMContentLoaded event:
The DOMContentLoaded event is fired when the document has been completely loaded and parsed, without waiting for stylesheets,...
The simplest, most robust way is to use the waitForKeyElements() utility.
Here is a complete script...
The rsp in the first then-block is a response object, not the data returned by the backend. The response object doesn't have a stat field, so the value of it cannot be...