How to run ajax in WordPress Post?

I believe one of the comments should fix your issue given how you mentioned that the code works outside of WordPress, which does in fact appear to be a problem with your references to $ instead of jQuery.

Also, i have written a post on this exact topic with step by step instruction, you can see it here:
Ajax Calls in WordPress

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)