JQuery UI Datepicker length is null or is not an object error Solution

When we develop an ASP. NET site, if we use the jQuery UI Datepicker and ASP. NET verification controls (such as RequiredFieldValidator) in combination: Copy codeThe Code is as follows: <asp: TextBox ID = "txtDate" runat = "server"> </asp: TextBox>
<Asp: RequiredFieldValidator ID = "reqDate" runat = "server" ControlToValidate = "txtDate" ErrorMessage = "*"> </asp: RequiredFieldValidator>
<Script type = "text/javascript" >$ ("# <% = txtDate. ClientID %>"). datepicker ();
</Script>

When we select a date in Datepicker, the error "'length' is null or not an object" will occur. This is caused by the Datepicker bug. After my research, I found a very simple solution-capture the onSelect event of Datepicker without any processing:Copy codeThe Code is as follows: $ ("# <% = txtDate. ClientID %>"). datepicker ({
OnSelect: function (dateText, inst ){
// No Processing
}
});

Now, after a date is selected, the error "'length' is null or not an object" will not appear, and the ASP. NET verification control can also run as usual.