How to disable all the elements of a form using JavaScript

Here’s a little JavaScript function that disables all form elements:

function disableElements(formName) {
  var fm = document.forms[formName];
  for(var i = 0; i < fm.elements.length; ++i) {
    fm.elements[i].disabled = true;

As you may have noticed the only parameter you need to pass is the form name.

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