Is the form rendering as you expect?
Using your browser developer console, is the ajax call firing correctly?
Is the route being hit at all? Have you just echoed out something at the top of the method just to check?
I'd recommend returning some kind of JSON object instead of just a string.
nothing be happen. when i change my option, my program did not respond
Try and answer the questions, I'll be in a better position to help you.
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