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/* jshint devel: true */
( 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 release() function.
*
* var allowCloseWindow = mw.confirmCloseWindow();
* // ... do stuff that can't be interrupted ...
* allowCloseWindow.release();
*
* The second function returned is a trigger function to trigger the check and an alert
* window manually, e.g.:
*
* var allowCloseWindow = mw.confirmCloseWindow();
* // ... do stuff that can't be interrupted ...
* if ( allowCloseWindow.trigger() ) {
* // don't do anything (e.g. destroy the input field)
* } else {
* // do whatever you wanted to do
* }
*
* @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 {Object} An object of functions to work with this module
*/
mw.confirmCloseWindow = function ( options ) {
var savedUnloadHandler,
mainEventName = 'beforeunload',
showEventName = 'pageshow',
message;
options = $.extend( {
message: mw.message( 'mwe-prevent-close' ).text(),
test: function () { return true; }
}, options );
if ( options.namespace ) {
mainEventName += '.' + options.namespace;
showEventName += '.' + options.namespace;
}
if ( $.isFunction( options.message ) ) {
message = options.message();
} else {
message = options.message;
}
$( 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
return message;
}
} ).on( showEventName, function () {
// Re-add onbeforeunload handler
if ( !window.onbeforeunload && savedUnloadHandler ) {
window.onbeforeunload = savedUnloadHandler;
}
} );
/**
* Return the object with functions to release and manually trigger the confirm alert
*
* @ignore
*/
return {
/**
* Remove all event listeners and don't show an alert anymore, if the user wants to leave
* the page.
*
* @ignore
*/
release: function () {
$( window ).off( mainEventName + ' ' + showEventName );
},
/**
* Trigger the module's function manually: Check, if options.test() returns true and show
* an alert to the user if he/she want to leave this page. Returns false, if options.test() returns
* false or the user cancelled the alert window (~don't leave the page), true otherwise.
*
* @ignore
* @return {boolean}
*/
trigger: function () {
// use confirm to show the message to the user (if options.text() is true)
if ( options.test() && !confirm( message ) ) {
// the user want to keep the actual page
return false;
}
// otherwise return true
return true;
}
};
};
} )( mediaWiki, jQuery );