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( function ( mw, $ ) {
/**
* @method confirmCloseWindow
* @member mw
*
* Prevent the closing of a window with a confirm message (the onbeforeunload event seems to
* work in most browsers.)
*
* This supersedes any previous onbeforeunload handler. If there was a handler before, it is
* restored when you execute the returned function.
*
* var allowCloseWindow = mw.confirmCloseWindow();
* // ... do stuff that can't be interrupted ...
* allowCloseWindow();
*
* @param {Object} [options]
* @param {string} [options.namespace] Namespace for the event registration
* @param {string} [options.message]
* @param {string} options.message.return The string message to show in the confirm dialog.
* @param {Function} [options.test]
* @param {boolean} [options.test.return=true] Whether to show the dialog to the user.
* @return {Function} Execute this when you want to allow the user to close the window
*/
mw.confirmCloseWindow = function ( options ) {
var savedUnloadHandler,
mainEventName = 'beforeunload',
showEventName = 'pageshow';
options = $.extend( {
message: mw.message( 'mwe-prevent-close' ).text(),
test: function () { return true; }
}, options );
if ( options.namespace ) {
mainEventName += '.' + options.namespace;
showEventName += '.' + options.namespace;
}
$( window ).on( mainEventName, function () {
if ( options.test() ) {
// remove the handler while the alert is showing - otherwise breaks caching in Firefox (3?).
// but if they continue working on this page, immediately re-register this handler
savedUnloadHandler = window.onbeforeunload;
window.onbeforeunload = null;
setTimeout( function () {
window.onbeforeunload = savedUnloadHandler;
}, 1 );
// show an alert with this message
if ( $.isFunction( options.message ) ) {
return options.message();
} else {
return options.message;
}
}
} ).on( showEventName, function () {
// Re-add onbeforeunload handler
if ( !window.onbeforeunload && savedUnloadHandler ) {
window.onbeforeunload = savedUnloadHandler;
}
} );
// return the function they can use to stop this
return function () {
$( window ).off( mainEventName + ' ' + showEventName );
};
};
} )( mediaWiki, jQuery );
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