Javascript - Trigger Error

Question

Question

Is there a way to trigger a custom Javascript error message? In Chrome, I have found console.warn[error,log] for sending messages to the browser. However, this only works in Chrome (and possibly Firefox). This line itself triggers an error in Internet explorer, though.

I'd like to be able to trigger errors that violate the rules of the Javascript function. For example, a function that takes an object as a value expects the object to have an attribute of "dialog". If that attribute doesn't exist, I want to trigger an error message "Modal Window: No dialog id specified."

Context

I am building a PHP class and Javascript class that works together so that programmers of our application can easily create dialog boxes that will be uniform and reliable.

---

Example Code

Click to copy

try {
    if (!params || !params['dialog']) {
        throw "NoDID";
    }
}
catch (error) {
    if (error == "NoDID") {
        //com.MySITE.js.warn("Modal Window: No dialog id specified.");
        //Trigger custom error message here.
    }
}

I'd like the message to go to the javascript window for easy developer debugging. Just doing "throw" results in "Uncaught Custom Error Message". I don't want the user to see this in anything on the page. I want it available in the js log for developer use.

Answer 1

Use throw:

Click to copy

throw "Deliberate Error!";