javascript Operators throw
@March 15, 2008, 1:22 a.m.
| throw | Firefox/Netscape/NN 6 IE 5 ECMA 3 |
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Triggers an exception condition, passing a value along with the exception. Although the value you pass can be a simple string, ideally you should pass an instance of the JavaScript Error object filled with sufficient information for a catch statement to act intelligently on the error. A throw statement must be enclosed in the try portion of a try-catch construction. |
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| Example | |
function processNumber(inputField) {
try {
var inpVal = parseInt(inputField.value, 10);
if (isNaN(inpVal)) {
var msg = "Please enter a number only.";
var err = new Error(msg);
if (!err.message) {
err.message = msg;
}
throw err;
}
// process number
}
catch (e) {
alert(e.message);
inputField.focus( );
inputField.select( );
}
}
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