A Javascript error can be handled a few different ways. Most of the time, it is up to the web browser you are using to decide how to handle a Javascript error. Although they usually do a good job of handling the Javascript error, none of them do a good job informing the user of the error or help them get past the error. An error can affect a web page from functioning altogether, so deciding how to handle an error smartly should not be something left to the internet browser alone. Using the window.onerror event, you can deal with Javascript errors in a much better manner when users encounter them while using your Javascript programs.The most commonly supported method for handling Javascript errors is the window.onerror event. You can use this event to tell an internet browser how to handle an error should one be encountered. You can tell the internet browser to run a specific section of your program or code in the event of an error. You may decide to have the internet browser ignore the error, or send the user to a error webpage. It will be your choice as to what is best for your webpages. Besides informing you of syntax errors, the window.onerror event is also an excellent way to deal with errors that occur when the internet browser attempts to display a picture.Suppressing the Javascript error is a good idea on web pages that do not rely on Javascript to display and operate correctly. For example, if you are using Javascript to make your links change color and shape when the mouse is placed on them, then it is not necessary to display an annoying error message if this feature is not working. You will just be likely to annoy the webpage visitor causing them to leave your web site. To suppress Javascript errors, just write a function that does nothing and point the internet browser to this code each time an error event occurs. If your webpage needs Javascript to run properly, this is not going to do any good.The easiest way to deal with a Javascript error is to redirect the web site visitor to an error page similar to a 404 error page. This will allow you to display a descriptive error code for the user, or suggest alternate locations on your site that they can find the information they are looking for. You also may have a simpler HTML web site that you would like to redirect the visitor to if they are having trouble with your more interactive Javascript version. No matter what you decide to do, be sure that you thoroughly test your code and error handling functions. To do this, you may want to intentionally make an error in the main part of your Javascript program so that you can test its error handling abilities.

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