javascript - form.onsumbit subclass -


i write smart extension chrome , inject javascript inside frame in frameset page...

in 1 of frame want replace onsumbit form. want analyze (x, y) values image type field before make submit.

i can find element name form. can onsubmit property. how make check sending values before submit?

thanks.

hm, this?

var formel = document.getelementbyid("form1");  var originalonsubmit = formel.onsubmit;  formel.onsubmit = function() {     if(all_ok) {         originalonsubmit();     } else {         return false;     } } 

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