Question

Is there any chance to use prototype on a Form object, this is not working:

Form.prototype.myFunc=function()
{
  alert('OK!');
}

On the other hand, String objects are extendable, for example:

String.prototype.trim = function() {
  return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}

Answer 1

If you means HTMLFormElement, then it should be

HTMLFormElement.prototype.myFunc=function() {
  alert('OK!');
};