Question

I thought this would be simple I have a table with the first column a checkbox
I am using this code to make the checkbox check all the other checkboxs

$('.checkall').click(function () {
    $(this).parents('tbody:eq(0)').find(':checkbox').attr('checked', this.checked);
});

The HTML/Jquery code to create the table

 $("#menuarea").html('<a href="#!/home" id="gotohome"><div id="backmain" class="backbg">Back</div></a><div id="nav" class="backbgright">New Business Lead</div>'+
                        '<div id="dowithleads"></div>'+
                        '<table cellpadding="0" cellspacing="0" border="0" class="sortable paginated" id="manageleads">'+
'   <thead>'+
'       <tr>'+
'           <th class="small"><input type="checkbox" class="checkbox checkall" value="Yes"></th>'+
'           <th class="sort-alpha">Created Time</th>'+
'           <th class="sort-alpha">Company</th>'+
'           <th class="sort-alpha">Lead Name</th>'+
'           <th class="sort-alpha">Phone No.</th>'+
'           <th class="sort-alpha bigger">Email</th>'+
'           <th class="sort-alpha">Lead Owner</th>'+
'           <th class="sort-alpha last">Lead Status</th>'+
'       </tr>'+
'   </thead>'+
'   <tbody>'+
'       <tr>'+
'           <td class="small"><input type="checkbox" class="formbox"></td>'+
'           <td>Mozilla 1.6</td>'+
'           <td>Win 95+ / OSX.1+</td>'+
'           <td class="center">1.6</td>'+
'           <td class="center">A</td>'+
'           <td class="center bigger">A</td>'+
'           <td class="center">A</td>'+
'           <td class="center last">A</td>'+
'       </tr>'+
'       <tr>'+
'           <td class="small"><input type="checkbox" class="formbox"></td>'+
'           <td>Mozilla 1.2</td>'+
'           <td>Win 94+ / OSX.1+</td>'+
'           <td class="center">1.5</td>'+
'           <td class="center">D</td>'+
'           <td class="center bigger">A</td>'+
'           <td class="center">N</td>'+
'           <td class="center last">A</td>'+
'       </tr>'+
'</table>');

Answer 1

If you’re using jQuery 1.6.x, use .prop:

$('.checkall').click(function () {
    $(this).closest('table').find('input[type=checkbox]').prop('checked', this.checked);
});

Also note that $(this).parents('tbody:eq(0)') does not select anything. Your .checkall is not inside a tbody. I changed it to $(this).closest('table').