Disable Radio Button Groups Onload

Greg Burghardt Aug 24, 2007

General

This unobtrusive script will disable groups of radio buttons on the page if one radio button is checked. It works with multiple groups and multiple forms on one page. Buttons are disabled on a group-by-group basis. Easy to use!

Notes

Created by: Greg Burghardt
Web Site: WebDeveloper.com Forums
Posted: August 24, 2007

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: disableRadioButtons,js

/* This script and many more are available free online at
The JavaScript Source!! http://www.javascriptsource.com
Created by: Greg Burghardt | http://www.webdeveloper.com/forum/showthread.php?t=158022 */
function disableRadioGroups() {
  var forms, el, radioGroup;
  var i = end = j = elsEnd = rg = rgEnd = 0;
  
  if (document.getElementsByTagName) {
    forms = document.getElementsByTagName('form');
    /* Loop through all the FORMs */
    for (i, end = forms.length; i < end; i++) {
      /* Loop through each form element */
      for (j = 0, elsEnd = forms[i].elements.length; j < elsEnd; j++) {
        el = forms[i].elements[j];
        /* If this is a checked, enabled radio button in a radio group... */
        if (!el.disabled
            && el.nodeName === 'INPUT'
            && el.type == 'radio'
            && el.checked
            && forms[i].elements[el.name].length) {
          radioGroup = forms[i].elements[el.name];
          /* Loop through radio group and disable buttons */
          for (rg = 0, rgEnd = radioGroup.length; rg < rgEnd; rg++) {
            radioGroup[rg].disabled = true;
          }
        }
      }
    }
  }
}

// Multiple onload function created by: Simon Willison
// http://simonwillison.net/2004/May/26/addLoadEvent/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  disableRadioGroups();
});

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="disableRadioButtons,js"></script>

Body

Paste this code into the BODY section of your HTML document


<form>
Are you a member?<br>
<input type="radio" name="member" value="1" checked>Yes<br>
<input type="radio" name="member" value="2">No<br>
<input type="radio" name="member" value="3">I'm Not Sure<br>
<p>
Will you attend the national event?<br>
<input type="radio" name="conf" value="1">Yes<br>
<input type="radio" name="conf" value="2">No<br>
</form>

Leave a Response

(6 comments)

You would need to rewrite the script to do that.

Lee Oct 31, 2008

This is really cool... but I was wondering if something like this could be done 'onchange' instead of 'onload' with set(s) of radio buttons of my desire. (I think that's what the other 2 users (that commented here) wanted too.[br /][br /]For example, on your questions, if the first questions was:[br /]"Will you attend the national event?"[br /]If the 'No' radio button is selected then 2nd question: "Are you a member?" stays disabled, however if they answer 'Yes' then the 2nd radio set of questions become available.[br /][br /]Make sense?

Douglas Apr 27, 2008

As I mentioned to John above, it is for additional information when you don't want the user changing the original question.

Lee Oct 3, 2007

This is supposed to be used when additional information is required and you don't want the user changing the original question.

Lee Oct 3, 2007

I don't get it. The first group of radio buttons are always disabled. What use are they?

Brian Aug 27, 2007

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