MediaWiki:Gadget-ShowJavascriptErrors.js

// This only shows alerts for things after this handler is installed of course. // Because this is a gadget, error reporting can thus be inconsistent. var originalErrorHandler = window.onerror || null; // Column and error args are optional window.onerror = function ( message, url, line, colomn, error ) { var $msg = $( ' ' ); if ( url ) { $( ' ' )			.text( url + ' at line ' + line + ': ' ) .appendTo( $msg ); }	$( ' ' )		.text( message ) .appendTo( $msg );

mw.notify( $msg, {		autoHide: true,		autoHideSeconds: 10,		tag: null,		title: 'Javascript Error',		type: 'error'	} ); if (originalErrorHandler) { return originalErrorHandler.apply(this, arguments); } }; // unbind on leaving the page $( window ) .on( 'unload', function {		window.onerror = originalErrorHandler;	} );