验证文本框的输入

Question

如果有值，我正在尝试验证文本框。此文本框位于用户控件中。

我试图调试我得到以下值。

input[id*=txtTitle]").val()



{"enabled":true,"emptyMessage":"","validationText":"","valueAsString":"","lastSetTextBoxValue":""}

如何验证此用户控件？请告诉我。

<script type="text/javascript">
       $(document).ready(function () {
            $("#<%=Button2.ClientID %>").click(function () {
                var valid = true;
                var msg = "Please fill form:\n";
                if($("input[id*=txtTitle]").val().length == 0{ 
                    msg += "Title is Required!\n";
                    valid = false;
                }
</script>  


           <uc1:TextBoxWithCount ID="txtTitle" runat="server" MaxLength="200" ></uc1:TextBoxWithCount>