Catch an error in JavaScript

Description

The following code shows how to catch an error.

Example


<!DOCTYPE html>
<HTML>
<HEAD>
<TITLE>Throw that error!</TITLE>
<SCRIPT>
function throwError(errString) {<!--from   ww w . j ava2s  .  c o m-->
try {
throw new Error (42, errString);
}
catch(e){
alert("Error number: " + e.number + "; Description: " + e.description)
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name="theForm">
Error text:
<INPUT type=text name=errText size=40>
<INPUT type=button name=btnThrow value="Throw it!"
onClick="throwError(document.theForm.errText.value);">
</FORM>
</BODY>
</HTML>

Click to view the demo

The code above generates the following result.

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