Select All/Deselect All checkboxes in a page

If using jquery, you can use the following (coffeeScript):

if (this.checked)
  $(':checkbox').each ->
    $(this).prop('checked', true)                     
else
  $(':checkbox').each ->
    $(this).prop('checked', false)

I found an issue trying to set this.checked = false - not really sure what was happening, but the above code worked.

Here's a working example for you: http://jsfiddle.net/wYPWL/

HTML example:

<input type="checkbox" id="selectAll" value="selectAll"> Select / Deselect All<br/><br/>

<input type="checkbox" name="foo" value="bar1"> Bar 1<br/>
<input type="checkbox" name="foo" value="bar2"> Bar 2<br/>
<input type="checkbox" name="foo" value="bar3"> Bar 3<br/>
<input type="checkbox" name="foo" value="bar4"> Bar 4<br/>

Javascript:

$('#selectAll').click(function() {
   if (this.checked) {
       $(':checkbox').each(function() {
           this.checked = true;                        
       });
   } else {
      $(':checkbox').each(function() {
           this.checked = false;                        
       });
   } 
});

This will work regardless of what your checkboxes are named. If you really wanted to target only your checkboxes shown in your code above, you can replace $(':checkbox') with $('input[id^="distribution_ids"]') which is jQuery's way of targeting input elements that have an ID that starts with distribution_ids

I have found an issue with iWasRobbed's Answer that if Select All is checked and then if you unchecked any one option like (Bar1, Bar2, Bar3) then Select All must be unchecked...

Here is Solution..

HTML Code

<input id="campaign_range_ids_1" class="checkbox" type="checkbox" value="1" name="campaign[range_ids][]"> India
<input id="campaign_range_ids_2" class="checkbox" type="checkbox" value="2" name="campaign[range_ids][]"> London
<input id="campaign_range_ids_3" class="checkbox" type="checkbox" value="3" name="campaign[range_ids][]"> USA
<input id="campaign_range_ids_4" class="checkbox" type="checkbox" value="4" name="campaign[range_ids][]"> All

JavaScript Code:

$('#campaign_range_ids_4').click(function () {

    if ($(this).is(':checked')) {
        $('#campaign_range_ids_1,#campaign_range_ids_2,#campaign_range_ids_3').prop('checked', true);

    } else {
        $('#campaign_range_ids_1,#campaign_range_ids_2,#campaign_range_ids_3').prop('checked', false);
    }

});

$('#campaign_range_ids_1,#campaign_range_ids_2,#campaign_range_ids_3').click(function () {

    if ($(this).is(':checked')) {
        } else {
            $('#campaign_range_ids_4').prop('checked', false);
    }

});

Working Demo