Check all CheckBox using JavaScript not working with Master Pages in ASP.Net

i used the javascript to check all checkbox inside gridview bt now its not working, below is my javascript

 <script type="text/javascript">
   
    $(document).ready(function() {
    $('[id$=chkHeader]').click(function() {
    $("[id$='chkChild']").attr('checked', this.checked);
    });
    });
    
    </script>