E Error handler (Interface) There is an onError event defined as part of the set of events supported by JavaScript. However, as of JavaScript version 1.2, the onError event is actually only supported by Image objects when defined in HTML tag attributes. You can add an error handler to a window object with the onerror property. The ![]()
tag element allows an error during image loading to be handled gracefully. Attaching an error handler to a window with the window.onerror property allows JavaScript errors to be intercepted. Error events have a slightly different parameter passing API so although they are events, they are slightly different to the rest of the event model. See also: Error handler, Event handler, Event model, onError, Window.onerror Error handler (Interface) Triggered by an error in the JavaScript execution. JavaScript syntax: function anErrorHandler(aMessage, aURL, aLine) The line number where the error occurred The text of the error message An identifier name for the function The URL of the document containing the error Argument list: The script source for the error handler - { someCode }; aLine aMessage anErrorHandl er aURL someCode This is a means of trapping the errors in any script. You can activate an error handler in various ways. Placing this line at the top of your script will trap all errors within that script: self.onerror = function() { return true }; Because the script always returns true, no error dialog will ever be displayed. Here is a pseudo code example of a better technique. function HandleErrors(aMessage, aURL, aLine){ //If we can handle the error with a piece of code return true; //Else we can’t do anything return false;}self.onerror = HandleErrors; An error handler should return true if the host environment can safely ignore the error and false if the environment needs to handle the error as normal. Error, Error events, Semantic event, Window.onerror See also:
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