HTML form post to PHP call using AJAX?

You're problem is that you are using a submit button. The submit button will submit the form, change it from a type="submit" to type="button" and it will work and as @juzerali suggested, use jQuery, that code hurts my head.

1st, yes that is awful, use jquery. 2nd although you have bound ajax call with onclick of submit button, you have not prevented the default behaviour from executing. The form will still get submitted the usual way.

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