how to check all checkboxes within a div in jQuery?

Question

EDIT:

Thanks for the answers guys, it does look correct and it works on jsfiddle.net , but in my code the alert fires well, yet nothing happens to the checkboxes. :/

     $('#selectChb').click(function(){
         $(':checkbox').prop("checked", true);
         alert("1");
    });

     $('#deselectChb').click(function(){
         $(':checkbox').prop("checked", false);
         alert("2");
    });

...

<div id="chbDiv" class="ui-widget ui-widget-content ui-corner-all" >  <br></br>
  <table width="90%" border="0" align="center" cellpadding="5" cellspacing="0">
    <tr>
    <td colspan="2">Following:</td>
    <td>&nbsp;</td>
  </tr>
    <tr>
    <td width="25" align="left"><input type="checkbox" id="check1" /><label for="check1">&nbsp;</label></td>
    <td width="45" align="center"><img src="face_01.jpg" width="32" height="32"></td>
    <td>Andrew Lloyd Webber</td>
  </tr>
      <tr>
    <td width="25" align="left"><input type="checkbox" id="check2" /><label for="check2">&nbsp;</label></td>
    <td width="25" align="center"><img src="face_02.jpg" width="32" height="32"></td>
    <td>Richard Branson</td>
  </tr>
      <tr>
    <td width="25" align="left"><input type="checkbox" id="check3" /><label for="check3">&nbsp;</label></td>
    <td width="25" align="center"><img src="face_03.jpg" width="32" height="32"></td>
    <td>Dmitry Medvedev</td>
  </tr>
</table>
  <br>
  <table width="90%" border="0" align="center" cellpadding="5" cellspacing="0">
    <tr>
      <td><a href="#" id="selectChb" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-check"></span>Select All</a>&nbsp;
      <a href="#" id="deselectChb" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-close"></span>Deselect All</a></td>
      <td>&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    </table>
<br>

</div>
  <br>
  <div  class="ui-widget ui-widget-content ui-corner-all">

Answer 1

This is a derived ultimate solution that finds all checkboxes inside a DIV and checks or unchecks according to an other single checkbox outside the DIV which says check/uncheck

    function checkCheckboxes( id, pID ){

    $('#'+pID).find(':checkbox').each(function(){

        jQuery(this).attr('checked', $('#' + id).is(':checked'));

    });     

}

Usage:

<label>check/uncheck  
<input type="checkbox" id="checkall" value="1" 
onclick="checkCheckboxes(this.id, 'mycheckboxesdiv');" >
</label>

<div id="mycheckboxesdiv">
<input type="checkbox" value="test1" name="test">
<input type="checkbox" value="test2" name="anothertest">
<input type="checkbox" value="test3" name="tests[]">
<input type="checkbox" value="test1" name="tests[]">
</div>

Advantage is you can use independent checkbox sets and check / uncheck all independent from other sets. It is simple and no need to work with id or classes of each checkboxes.

Answer 2

Try the following,

Live Demo

$('#selectChb').click(function(){ 
     $(':checkbox').prop("checked", true);
});

Answer 3

Try this code

 $("#Div_ID").find('input[type=checkbox]').each(function () {
             // some staff
             this.checked = true;
        });