JavaScript Tutorial/Statement/try catch
Catch that error
<HTML>
<HEAD>
<TITLE>Catch that error!</TITLE>
<SCRIPT>
function catchError(errString) {
try {
try {
if (errString == -1)
throw new Error (-1, "errString is -1!");
else
throw new Error (0, "errString is NOT -1!");
}
catch(e) {
if (e.number == -1)
return (e.description + " Got this one!");
else
throw e;
}
}
catch (e){
return(e.description + " This one not handled here!");
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name="theForm">
<INPUT type=text name=errText value="-1">
<INPUT type=button name=btnThrow value="Catch it!" onClick="alert(catchError(document.theForm.errText.value));">
</FORM>
</BODY>
</HTML>
Exception handling with try/catch
<HTML>
<HEAD>
<TITLE></TITLE>
<SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">
function getMonthName (monthNumber) {
throw "InvalidMonthNumber"
}
try {
alert(getMonthName(13))
}
catch (exception) {
alert("An " + exception + " exception was encountered. Please contact the program vendor.")
}
</SCRIPT>
<BODY>
</BODY>
</HTML>
try...catch
Syntax
try{
statement1
}catch(exception){
statement2
}