Question

I can’t see a clear mistake in this code. Instead of validating my fields, it just tries to send my form and I don’t know why.

This is my jsFiddle: http://jsfiddle.net/PAALA/

Other question, how to validate if select box was picked?

Answer 1

Firstly, because of how JSFiddle works, defining a function with function foo() {...} is unreliable. Instead, use foo = function() {...} syntax.

Next, you have an error in your script when you try to access document.forms["bug_form"]["Project"].value – there is no text input with that name.

Finally, to prevent accidental submission, do this:

validateBugForm = function() {
    try {
        // ALL YOUR ORIGINAL CODE HERE
    }
    catch(e) {
        alert("An error occurred: "+e);
        return false;
    }
}

This will ensure that false is returned, even if your code errs.