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Lessons JavaScript throw statement Bookmark and Share
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In the previous lesson we learned how to handle errors / exceptions in JavaScript programs.

In this lesson we will learn how to throw our own exceptions.

In JavaScript we have the facility of signaling errors in our programs. We use the throw statement to generate or signal an error condition in our code that can, then, be handled by a try...catch statement.

The syntax of using the throw statement follows:

throw exceptionExpression;

The exceptionExpression can be a combination of keywords, variables, operators, and literals that finally yield a string, number, or object.

<html>
<head>
<script type="text/JavaScript">
function generateError(number)
{
try
{
if (number == 0) {
throw "number equals zero"; // throws an error
}
}
catch(error) //catches the error
{
alert(error.description());
}
}
generateError(0);
</script>
</head>

<body>
</body>

</html>


Next >>> Lesson No. 32: JavaScript onError Event





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