asp.net - JQuery Calendar control only appears once when clicking on textbox -

i have jquery calendar works on webpage once. after select date , try click on textbox change date calendar doesn't appear.

here code `

    $(document).ready(function () {                    $("#<%= txtdatepicker.clientid %>").datepicker();                }); 

`

<asp:textbox id="txtdatepicker" runat="server" ontextchanged="txtdatepicker_textchanged" autopostback="true" ></asp:textbox> 

ok figured out. because of autopostback. when using autopostback partial page load therefore datepicker did not work. added datepicker binding pageload function , works now.....

thanks answers guys

 function pageload() {         $("#<%= txtdatepicker.clientid %>").datepicker();     }