javascript - Calling JS Function when The tag contains duplicate 'ID' attributes -

i want call js function can jquery calendar when click on text box showing error. want know how can use both attributes txtexpiry , datapicker? or there other way ?

here code of text box

<asp:textbox id="txtexpiray"  runat="server" id="datepicker" clientidmode="static"  width="70px"></asp:textbox> 

here function

<script type='text/javascript'>          $(function () {              $('#datepicker').datepicker();          });     </script> 

you can't use duplicate id attributes - or duplicate attributes matter (id attributes should unique page).

you can this:

<asp:textbox id="txtexpiray"  runat="server" clientidmode="static"  width="70px"></asp:textbox>  <script type='text/javascript'>          $(function () {              $('#txtexpiray').datepicker();          });     </script>