How do I cancel form submission in submit button onclick event?

Question

I'm working on an ASP.net web application.

I have a form with a submit button. The code for the submit button looks like <input type='submit' value='submit request' onclick='btnClick();'>.

I want to write something like the following:

function btnClick() {     if (!validData())         cancelFormSubmission(); } 

How do I do this?

Answer 1

You are better off doing...

<form onsubmit="return isValidForm()" /> 

If isValidForm() returns false, then your form doesn't submit.

You should also probably move your event handler from inline.

document.getElementById('my-form').onsubmit = function() {     return isValidForm(); };