c# - Check Object Exists throws Object Required Error -


i have web form data entry. page requires id passed via query string. in code behind check id has been supplied. if hasn't form (in panel) hidden , error message displayed.

in html have jquery script block attaches event (downloaded date picker). 

    window.onload = function() {         new jsdatepick({             usemode: 2,             target: "txtdateofincident",             dateformat: "%d %m %y"         });     };

if code behind hides form jquery throws error object required

so in jquery trying test existance of object as per post... 

    window.onload = function() {         if ($('#txtdateofincident').length) {             new jsdatepick({                 usemode: 2,                 target: "txtdateofincident",                 dateformat: "%d %m %y"             });         }     };

now object required error on $('#txtdateofincident').length code.

any resolve appreciated.

i think better if set client id mode of txtdateofincident clientidmode="static".

<asp:textbox id="txtdateofincident"  runat="server" clientidmode="static" />

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