Re: Error Console links

https://developer.mozilla.org/en/Exception_logging_in_JavaScript

On 5/10/2010 6:11 AM, Robert wrote:
> I have a question about the display of javascript Errors in the Firefox
> Error Console.
>
> The Error Console will display the error when a javascript object is
> thrown (and not catched).
> If this is done with the normal Error object, for example:
> throw new Error("my message")
> then it shows the error message and a nice link that you can use to jump
> to the file and line number
> where the Error object was created.
>
> I would like to know what the exact conditions are for this link to be
> displayed.
> I ask this because I tried to extend the Error object in many ways to
> disinguish between different
> exceptions, yet still have that useful link in the Error Console.
>
> My custom Exception object is extended in such a way that "instanceof
> Error" returns true. And it contains
> the fileName and lineNumber properties. Yet I still see no link.
>
> I give some javascript to show you one method I used to extend the Error
> object:
>
> ************
> clone = function (object)
> {
> function Dummy(){};
> Dummy.prototype = object;
> return new Dummy();
> }
>
> extend = function (superclass, subclass)
> {
> subclass.prototype = clone(superclass.prototype);
> subclass.prototype.constructor = subclass;
> }
>
> Exception = function(error)
> {
> for (var p in error)
> {
> this[p] = error[p];
> }
> }
> extend(Error, Exception);
> Exception.prototype.toString = function()
> {
> return "Exception: " + this.message + "
> (filename="+this.fileName+":"+this.lineNumber+")";
> }
>
> throw new Exception(Error("my exception"));
>
> ************
>
> Kind regards,
> Robert
>