CheckBoxList select all options in jQuery

Question

I have a CheckBoxList and one of the options is 'All'. I want to select all the options including All if the user checked 'All' and if the user unchecked 'All', I want to clear selections. If they select any other option except 'All', do nothing. Can anyone help me with jQuery to do this? I am using jQuery 1.2.6

<table border="0" onclick="SelectMe(this);" id="one">
<tbody>
    <tr>
        <td>
            <input type="checkbox" checked="checked" name="one$0" id="one_0"/><label for="one_0">All</label>
        </td>
        <td>
            <input type="checkbox" name="two$1" id="two_1"/><label for="two_1">Option One</label>
        </td>
        <td>
            <input type="checkbox" name="three$2" id="three_2"/><label for="three_2">Option Two</label>
        </td>
        <td>
            <input type="checkbox" name="four$3" id="four_3"/><label for="four_3">Option Three</label>
        </td>
        <td>
            <input type="checkbox" name="five$4" id="five_4"/><label for="five_4">Option Four</label>
        </td>
    </tr>
</tbody>

THANKS ALL FOR HELPING OUT. HERE IS MY ANSWER -

Bind this function to onclick attribute for each of checkboxlist.items

function selectAll(box) { 

 //check if this is 'All' checkbox

 var isAll = ($(box).next('label').text() == 'All');

 //get the checkboxlist

 var theList = $(box).parents('table:first'); 

  //if 'All' is checked/clicked, check all options

  if (isAll) {
    var check = theList.find('input:checkbox')[0].checked; 
     $.each(theList.find('input:checkbox'), function(i, v) {
        v.checked = check;
     });
  } 

 // check 'All' option if all other checkboxes are checked     
 else {
     var allchecked = true;
     $.each(theList.find('input:checkbox'), function(i, v) { 
         if(i) if (!v.checked) allchecked = false;
     });
     theList.find('input:checkbox')[0].checked = allchecked; 
}

Answer 1

the following should work [updated]

$(':checkbox').click( function() {
  // check if the label following the checkbox  is 'All'
  if ( $(this).next('label').text() == 'All') 
    {
     if ( $(this).is(':checked'))
       $(':checkbox').attr('checked', true)
     else
       $(':checkbox').attr('checked', false);
    }
} );

And more correct, instead of checking the next label, we should check the label that corresponds to the clicked checkbox according to the for attribute..

so

if ( $(this).next('label').text() == 'All') 

could be

if ( $('label[for="'+$(this).attr('id')+'"]').text() == 'All') 

Answer 2

Hi

$(document).ready(function() {

    $('input[type=checkbox]').click(function(){       //detects a check box click
        if ($(this).attr('id').indexOf("one_0") > -1){  //Checks if 'all' check box was clicked
            checkUncheckAll($(this).attr('checked'));   //Function call to check uncheck based on checked/unchecked state of All check box
        }
    });
});

//Function to check uncheck all check boxes
function checkUncheckAll(checkedValue) {
    $('input[type=checkbox]').each(function() {        
        this.checked = checkedValue;
    });
}

This approach has a flaw - the function checkUncheckAll loops over all check boxes in your form and checks/unchecks all of them. You can do it for a specific set of check boxes, if you assign their ID appropriately (i.e. checkSpec1, checkSpec2 etc.) and detect the check boxes whose id have checkSpec word.

I hope this helps.

cheers