jquery - add attribute to a <th> without id or class -

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i want add attribute table header without id or class. has field. code here not work. appreciate help

$(th[field = "item_group_id"]).attr('hidden', 'true');

or there other way can this? heres table

<table id="dg" title="jaiko pogi " class="easyui-datagrid" style="width:980px;height:370px;"         url="show_biochem.php"         toolbar="#toolbar" pagination="true"         rownumbers="false" fitcolumns="true" singleselect="true" height="auto";>     <thead>         <tr>         <th field="item_group_id" width="8">id</th>         </tr>     </thead> </table>

solved it. read documentation , turns out there function this. anyway help

$('#dg').datagrid('hidecolumn','item_group_id');

your selector incorrect. should string:

$('th[field="item_group_id"]').attr('hidden', 'true');

also, trying hide element? if so, adding attribute called "hidden" won't it.. try instead:

$('th[field="item_group_id"]').hide();

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