PRB: Value of a Checkbox Interpreted Differently

<SCRIPT LANGUAGE="VBScript">
<!--
   sub submit_onclick
   if document.Info.sound.checked = True then msgbox "The checkbox is
   checked!"
   end sub
   -->
</SCRIPT>
				

CAUSE

Following is a full HTML and VBScript example:

Sample Code

<HTML>
<HEAD>
<TITLE>Checkbox test </TITLE>
</HEAD>
<BODY>
<FORM NAME="Info">
<center>
My test checkbox
<input name="sound" type="checkbox">
<INPUT value="Test the checkbox value" TYPE="button" NAME="CheckIt"
ALIGN=left>
<SCRIPT LANGUAGE="VBScript">
<!--
sub CheckIt_onclick
if document.Info.sound.checked = true then msgbox "The checkbox is checked!"
end sub
-->
</SCRIPT>
</FORM>
</BODY>
</HTML>
				

The VBScript Language Reference defines "True" as the value -1. Internet Explorer 3.02 incorrectly interprets "True" as 1. For example:

if document.Info.sound.checked = -1 then msgbox "The checkbox is clicked!"

if document.Info.sound.checked = 1 then msgbox "The checkbox is clicked!"
				

The first line displays the message box correctly when you view it with Internet Explorer 4.01 or later, but not with Internet Explorer 3.02. Conversely, the second line displays the message box correctly when you use Internet Explorer 3.02, but not Internet Explorer 4.01 or later.

if document.Info.sound.checked then msgbox "The checkbox is checked!"