Question

I have problem with select all / deselect checkbox

Code Here

<input type="checkbox" value="" onclick="checkedAll();" name="checkall" id="checkall"/>

  function checkedAll() {
      $('.all span').click(function () {
       if(document.getElementById("checkall").checked == true)
       {
         $('#uniform-undefined span').addClass('checked');      
       }
       else
       {
         $('#uniform-undefined span').removeClass('checked');
       }
     });
     $.uniform.update();
   }

When I select checkbox(for all check box true) jQuery add span tag with class="checked"

     spanTag.addClass(options.checkedClass);

And no one check box are active.

<li><label><div id="uniform-undefined" class="checker">">
   <span class="checked"><input type="checkbox" value="F2" style="opacity: 0;"></span>
   </div><b>1 </b>
 </label></li>

<li><label><div id="uniform-undefined" class="checker">
   <span class="checked"><input type="checkbox" value="F2" style="opacity: 0;"></span>
   </div><b>2 </b>
</label></li>

<li><label><div id="uniform-undefined" class="checker">
    <span class="checked"><input type="checkbox" value="F3" style="opacity: 0;"></span>
    </div><b>3 </b>
</label></li>

Answer 1

Are you aiming for something like this ?

$('document').ready(function(){
    $('#all').click(function(){
        if($(this).is(':checked')){
            $('.group').attr("checked",true);
        }
        else{
            $('.group').attr("checked",false);
        }
    })
});

See this Demo