Ajax Request Results in form being submitted aswell

Answer 1

Are you using a submit button to call send_newsletter?

onreadystatechange callback function 'ajaxResult' is not called because you're doing a synchronous call to the server:

resource.open(t,u,false);

if you want ajaxResult to be called change it to :

resource.open(t,u,true);

for now that's what I see. You have to provide more info like how do you call send_newsletter?

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EDIT:(following author comment)

an INPUT of type image is a graphical submit button.

Answer 2

An input of type "image" will behave the same as a submit button. Use an anchor or button type input to trigger your method.

<input type="button" onclick="send_newsletter()" value="Send" />

<button onlclick="send_newsletter()">... </button>

<a href="#" onclick="send_newsletter(); return false;"><img src="... /></a>