onsubmit=“return false” has no effect on Internet Explorer 7/8 (form is still submitted)

Question

I have a form that will be submitted by javascript code triggered in \"onsubmit\" of the tag. Works fine on all browsers - but not on IE7/IE8.

What can I do?

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Answer 1

To cancel an event in legacy IE, you need to set returnValue to false. Simply returning false won't do it. I don't know why Microsoft implemented it in this way.

function validateForm(evt) {
//  if form is not valid
    if(!condition) {
    //  if evt has preventDefault
        if(evt.preventDefault)
            { event.preventDefault(); }
    //  if evt has returnValue
        else if(evt.returnValue)
            { evt.returnValue = false; }
    //  fallback
        else
            { return false; }
    }
}

//  assume form is reference to your form
form.attachEvent('onsubmit',validateForm);

Answer 2

Several ideas proposed here work (because they use different ways to write correct code), but there is a much easier answer

OP wrote :

onsubmit="submitmyform();"

instead of :

onsubmit="return submitmyform();"

That's it.