The problem is caused by the RadTextBox. It can be reproduced with the following code: <body> <form id="form1" runat="server"> <telerik:RadScriptManager ID="RadScriptManager1" runat="server"> <Scripts> <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" /> </Scripts> </telerik:RadScriptManager> <telerik:RadTextBox runat="server"></telerik:RadTextBox> <div class="divEl"></div> <input type="button" value="Test" onclick="test()" /> </form> <script> function test() { var input = $('.divEl'); $(input).wrap("<form>").closest("form").get(0).reset(); } </script> </body> </html> Problem is resolved in the RadTextBox's code.