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/*
Learn How to Program Using Any Web Browser
by Harold Davis
Apress CopyRight 2004
ISBN: 1590591135
*/
<HTML>
<HEAD>
<TITLE>Catch that error!</TITLE>
<SCRIPT>
function catchError(errString) {
try {
try {
if (errString == 42)
throw new Error (42, "errString is 42 !");
else
throw new Error (0, "errString is NOT 42 !");
}
catch(e) {
if (e.number == 42)
return (e.description + " Got this one!");
else
throw e; // re-throw the error
}
}
catch (e){
return(e.description + " This one not handled here!");
}
}
</SCRIPT>
</HEAD>
<BODY>
<H1>
Catch that error!
</H1>
<FORM name="theForm">
<TABLE>
<TR>
<TD colspan=2 >
We can handle 42 :
</TD>
<TD>
<INPUT type=text name=errText size=40 value="42">
</TD>
</TR>
<TR>
<TD colspan=2>
</TD>
<TD>
<INPUT type=button name=btnThrow value="Catch it!"
onClick="alert(catchError(document.theForm.errText.value));">
</TD>
</TR>
</TABLE>
</FORM>
</BODY>
</HTML>
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