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Script raises Page error when accessing HTML control

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Join Date: Jun 2007

Posts: 22

Reputation: dadelsen is an unknown quantity at this point

Solved Threads: 5

dadelsen

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Newbie Poster

Script raises Page error when accessing HTML control

Jun 13th, 2008

The following script function "btnRunScript_onclick" works as long as it does not access the HTML control "txtMessage". If it does, "Page Error" is shown in the statusbar of Internet Explorer (6). Knows anybody why? Thank you.

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<%@ Page Language="vb" AutoEventWireup="false" Codebehind="GuessingGame.aspx.vb" Inherits="Ch07Le04.GuessingGame"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>GuessingGame</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script id="clientEventHandlersJS" language="javascript">
 
function btnRunScript_onclick() {
        sMessage = "ABC";
	/* document.write("<h2>ABC</h2>"); */ /* works */
	txtMessage.value = sMessage; /* raises Page Error */
}
 
</script>
</HEAD>
<body language="javascript">
<form id="Form1" method="post" runat="server">
<h2>The Guessing Game - Responding to Events with Script Procedures</h2>
<hr>
<P>
<INPUT id="btnRunScript" type="button" value="Run Script" language="javascript" onclick="return btnRunScript_onclick()">
</P>
<P><INPUT id="txtMessage" type="text" value="ABC" name="txtMessage"></P>
</form>
</body>
</HTML>
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="GuessingGame.aspx.vb" Inherits="Ch07Le04.GuessingGame"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>GuessingGame</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script id="clientEventHandlersJS" language="javascript">

function btnRunScript_onclick() {
        sMessage = "ABC";
	/* document.write("<h2>ABC</h2>"); */ /* works */
	txtMessage.value = sMessage; /* raises Page Error */
}

</script>
</HEAD>
<body language="javascript">
<form id="Form1" method="post" runat="server">
<h2>The Guessing Game - Responding to Events with Script Procedures</h2>
<hr>
<P>
<INPUT id="btnRunScript" type="button" value="Run Script" language="javascript" onclick="return btnRunScript_onclick()">
</P>
<P><INPUT id="txtMessage" type="text" value="ABC" name="txtMessage"></P>
</form>
</body>
</HTML>

•

Join Date: Jun 2007

Posts: 22

Reputation: dadelsen is an unknown quantity at this point

Solved Threads: 5

dadelsen

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Newbie Poster

Re: Script raises Page error when accessing HTML control

Jun 13th, 2008

I enabled "detect scripterrors" in the browser. The message is:
'txtMessage' is not defined.
I moved the <script> element behind the <body> element. But this page error is still raised.

Last edited by dadelsen; Jun 13th, 2008 at 12:24 pm.

•

Join Date: Jun 2007

Posts: 22

Reputation: dadelsen is an unknown quantity at this point

Solved Threads: 5

dadelsen

Offline

Newbie Poster

Re: Script raises Page error when accessing HTML control

Jun 13th, 2008

I solved the problem meanwhile. I replaced

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txtMessage.value = sMessage; /* raises Page Error */

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window.Form1.txtMessage.value = sMessage; /* works */
window.Form1.txtMessage.value = sMessage; /* works */