If input field is empty, disable submit button

Question

I\'m trying to disable submit button if the user hasn\'t provided any text.

At first sight it looks that everything works just fine, but if user types some text, th

Answer 1

An easy way to do:

function toggleButton(ref,bttnID){
    document.getElementById(bttnID).disabled= ((ref.value !== ref.defaultValue) ? false : true);
}