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0x800a138f - JavaScript runtime error: Unable to get property 'submit' of undefined or null reference
Replace
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="JavaScriptSubmit.aspx.cs" Inherits="WebTest.JavaScriptSubmit" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function doSomething() {
document.second.submit();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="doSomething();" />
</div>
</form>
<form method="post" action="./JavaScriptSubmit.aspx" id="second"></form>
</body>
</html>
with
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="JavaScriptSubmit.aspx.cs" Inherits="WebTest.JavaScriptSubmit" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function doSomething() {
this.form1.submit();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="doSomething();" />
</div>
</form>
<form method="post" action="./JavaScriptSubmit.aspx" id="second"></form>
</body>
</html>
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