resources/src/mediawiki/mediawiki.notification.js

   1 ( function ( mw, $ ) {
   2         'use strict';
   3
   4         var notification,
   5                 // The #mw-notification-area div that all notifications are contained inside.
   6                 $area,
   7                 // Number of open notification boxes at any time
   8                 openNotificationCount = 0,
   9                 isPageReady = false,
  10                 preReadyNotifQueue = [],
  11                 rAF = window.requestAnimationFrame || setTimeout;
  12
  13         /**
  14          * A Notification object for 1 message.
  15          *
  16          * The underscore in the name is to avoid a bug <https://github.com/senchalabs/jsduck/issues/304>.
  17          * It is not part of the actual class name.
  18          *
  19          * The constructor is not publicly accessible; use mw.notification#notify instead.
  20          * This does not insert anything into the document (see #start).
  21          *
  22          * @class mw.Notification_
  23          * @alternateClassName mw.Notification
  24          * @constructor
  25          * @private
  26          * @param {mw.Message|jQuery|HTMLElement|string} message
  27          * @param {Object} options
  28          */
  29         function Notification( message, options ) {
  30                 var $notification, $notificationContent;
  31
  32                 $notification = $( '<div class="mw-notification"></div>' )
  33                         .data( 'mw.notification', this )
  34                         .addClass( options.autoHide ? 'mw-notification-autohide' : 'mw-notification-noautohide' );
  35
  36                 if ( options.tag ) {
  37                         // Sanitize options.tag before it is used by any code. (Including Notification class methods)
  38                         options.tag = options.tag.replace( /[ _-]+/g, '-' ).replace( /[^-a-z0-9]+/ig, '' );
  39                         if ( options.tag ) {
  40                                 $notification.addClass( 'mw-notification-tag-' + options.tag );
  41                         } else {
  42                                 delete options.tag;
  43                         }
  44                 }
  45
  46                 if ( options.type ) {
  47                         // Sanitize options.type
  48                         options.type = options.type.replace( /[ _-]+/g, '-' ).replace( /[^-a-z0-9]+/ig, '' );
  49                         $notification.addClass( 'mw-notification-type-' + options.type );
  50                 }
  51
  52                 if ( options.title ) {
  53                         $( '<div class="mw-notification-title"></div>' )
  54                                 .text( options.title )
  55                                 .appendTo( $notification );
  56                 }
  57
  58                 $notificationContent = $( '<div class="mw-notification-content"></div>' );
  59
  60                 if ( typeof message === 'object' ) {
  61                         // Handle mw.Message objects separately from DOM nodes and jQuery objects
  62                         if ( message instanceof mw.Message ) {
  63                                 $notificationContent.html( message.parse() );
  64                         } else {
  65                                 $notificationContent.append( message );
  66                         }
  67                 } else {
  68                         $notificationContent.text( message );
  69                 }
  70
  71                 $notificationContent.appendTo( $notification );
  72
  73                 // Private state parameters, meant for internal use only
  74                 // autoHideSeconds: String alias for number of seconds for timeout of auto-hiding notifications.
  75                 // isOpen: Set to true after .start() is called to avoid double calls.
  76                 //         Set back to false after .close() to avoid duplicating the close animation.
  77                 // isPaused: false after .resume(), true after .pause(). Avoids duplicating or breaking the hide timeouts.
  78                 //           Set to true initially so .start() can call .resume().
  79                 // message: The message passed to the notification. Unused now but may be used in the future
  80                 //          to stop replacement of a tagged notification with another notification using the same message.
  81                 // options: The options passed to the notification with a little sanitization. Used by various methods.
  82                 // $notification: jQuery object containing the notification DOM node.
  83                 this.autoHideSeconds = options.autoHideSeconds &&
  84                         notification.autoHideSeconds[ options.autoHideSeconds ] ||
  85                         notification.autoHideSeconds.short;
  86                 this.isOpen = false;
  87                 this.isPaused = true;
  88                 this.message = message;
  89                 this.options = options;
  90                 this.$notification = $notification;
  91         }
  92
  93         /**
  94          * Start the notification. Called automatically by mw.notification#notify
  95          * (possibly asynchronously on document-ready).
  96          *
  97          * This inserts the notification into the page, closes any matching tagged notifications,
  98          * handles the fadeIn animations and replacement transitions, and starts autoHide timers.
  99          *
 100          * @private
 101          */
 102         Notification.prototype.start = function () {
 103                 var options, $notification, $tagMatches, autohideCount;
 104
 105                 $area.css( 'display', '' );
 106
 107                 if ( this.isOpen ) {
 108                         return;
 109                 }
 110
 111                 this.isOpen = true;
 112                 openNotificationCount++;
 113
 114                 options = this.options;
 115                 $notification = this.$notification;
 116
 117                 if ( options.tag ) {
 118                         // Find notifications with the same tag
 119                         $tagMatches = $area.find( '.mw-notification-tag-' + options.tag );
 120                 }
 121
 122                 // If we found existing notification with the same tag, replace them
 123                 if ( options.tag && $tagMatches.length ) {
 124
 125                         // While there can be only one "open" notif with a given tag, there can be several
 126                         // matches here because they remain in the DOM until the animation is finished.
 127                         $tagMatches.each( function () {
 128                                 var notif = $( this ).data( 'mw.notification' );
 129                                 if ( notif && notif.isOpen ) {
 130                                         // Detach from render flow with position absolute so that the new tag can
 131                                         // occupy its space instead.
 132                                         notif.$notification
 133                                                 .css( {
 134                                                         position: 'absolute',
 135                                                         width: notif.$notification.width()
 136                                                 } )
 137                                                 .css( notif.$notification.position() )
 138                                                 .addClass( 'mw-notification-replaced' );
 139                                         notif.close();
 140                                 }
 141                         } );
 142
 143                         $notification
 144                                 .insertBefore( $tagMatches.first() )
 145                                 .addClass( 'mw-notification-visible' );
 146                 } else {
 147                         $area.append( $notification );
 148                         rAF( function () {
 149                                 // This frame renders the element in the area (invisible)
 150                                 rAF( function () {
 151                                         $notification.addClass( 'mw-notification-visible' );
 152                                 } );
 153                         } );
 154                 }
 155
 156                 // By default a notification is paused.
 157                 // If this notification is within the first {autoHideLimit} notifications then
 158                 // start the auto-hide timer as soon as it's created.
 159                 autohideCount = $area.find( '.mw-notification-autohide' ).length;
 160                 if ( autohideCount <= notification.autoHideLimit ) {
 161                         this.resume();
 162                 }
 163         };
 164
 165         /**
 166          * Pause any running auto-hide timer for this notification
 167          */
 168         Notification.prototype.pause = function () {
 169                 if ( this.isPaused ) {
 170                         return;
 171                 }
 172                 this.isPaused = true;
 173
 174                 if ( this.timeout ) {
 175                         clearTimeout( this.timeout );
 176                         delete this.timeout;
 177                 }
 178         };
 179
 180         /**
 181          * Start autoHide timer if not already started.
 182          * Does nothing if autoHide is disabled.
 183          * Either to resume from pause or to make the first start.
 184          */
 185         Notification.prototype.resume = function () {
 186                 var notif = this;
 187                 if ( !notif.isPaused ) {
 188                         return;
 189                 }
 190                 // Start any autoHide timeouts
 191                 if ( notif.options.autoHide ) {
 192                         notif.isPaused = false;
 193                         notif.timeout = setTimeout( function () {
 194                                 // Already finished, so don't try to re-clear it
 195                                 delete notif.timeout;
 196                                 notif.close();
 197                         }, this.autoHideSeconds * 1000 );
 198                 }
 199         };
 200
 201         /**
 202          * Close the notification.
 203          */
 204         Notification.prototype.close = function () {
 205                 var notif = this;
 206
 207                 if ( !this.isOpen ) {
 208                         return;
 209                 }
 210
 211                 this.isOpen = false;
 212                 openNotificationCount--;
 213
 214                 // Clear any remaining timeout on close
 215                 this.pause();
 216
 217                 // Remove the mw-notification-autohide class from the notification to avoid
 218                 // having a half-closed notification counted as a notification to resume
 219                 // when handling {autoHideLimit}.
 220                 this.$notification.removeClass( 'mw-notification-autohide' );
 221
 222                 // Now that a notification is being closed. Start auto-hide timers for any
 223                 // notification that has now become one of the first {autoHideLimit} notifications.
 224                 notification.resume();
 225
 226                 rAF( function () {
 227                         notif.$notification.removeClass( 'mw-notification-visible' );
 228
 229                         setTimeout( function () {
 230                                 if ( openNotificationCount === 0 ) {
 231                                         // Hide the area after the last notification closes. Otherwise, the padding on
 232                                         // the area can be obscure content, despite the area being empty/invisible (T54659). // FIXME
 233                                         $area.css( 'display', 'none' );
 234                                         notif.$notification.remove();
 235                                 } else {
 236                                         notif.$notification.slideUp( 'fast', function () {
 237                                                 $( this ).remove();
 238                                         } );
 239                                 }
 240                         }, 500 );
 241                 } );
 242         };
 243
 244         /**
 245          * Helper function, take a list of notification divs and call
 246          * a function on the Notification instance attached to them.
 247          *
 248          * @private
 249          * @static
 250          * @param {jQuery} $notifications A jQuery object containing notification divs
 251          * @param {string} fn The name of the function to call on the Notification instance
 252          */
 253         function callEachNotification( $notifications, fn ) {
 254                 $notifications.each( function () {
 255                         var notif = $( this ).data( 'mw.notification' );
 256                         if ( notif ) {
 257                                 notif[ fn ]();
 258                         }
 259                 } );
 260         }
 261
 262         /**
 263          * Initialisation.
 264          * Must only be called once, and not before the document is ready.
 265          *
 266          * @ignore
 267          */
 268         function init() {
 269                 var offset, notif,
 270                         isFloating = false;
 271
 272                 function updateAreaMode() {
 273                         var shouldFloat = window.pageYOffset > offset.top;
 274                         if ( isFloating === shouldFloat ) {
 275                                 return;
 276                         }
 277                         isFloating = shouldFloat;
 278                         $area
 279                                 .toggleClass( 'mw-notification-area-floating', isFloating )
 280                                 .toggleClass( 'mw-notification-area-layout', !isFloating );
 281                 }
 282
 283                 // Write to the DOM:
 284                 // Prepend the notification area to the content area and save its object.
 285                 $area = $( '<div id="mw-notification-area" class="mw-notification-area mw-notification-area-layout"></div>' )
 286                         // Pause auto-hide timers when the mouse is in the notification area.
 287                         .on( {
 288                                 mouseenter: notification.pause,
 289                                 mouseleave: notification.resume
 290                         } )
 291                         // When clicking on a notification close it.
 292                         .on( 'click', '.mw-notification', function () {
 293                                 var notif = $( this ).data( 'mw.notification' );
 294                                 if ( notif ) {
 295                                         notif.close();
 296                                 }
 297                         } )
 298                         // Stop click events from <a> tags from propogating to prevent clicking.
 299                         // on links from hiding a notification.
 300                         .on( 'click', 'a', function ( e ) {
 301                                 e.stopPropagation();
 302                         } );
 303
 304                 mw.util.$content.prepend( $area );
 305
 306                 // Read from the DOM:
 307                 // Must be in the next frame to avoid synchronous layout
 308                 // computation from offset()/getBoundingClientRect().
 309                 rAF( function () {
 310                         offset = $area.offset();
 311
 312                         // Initial mode (reads, and then maybe writes)
 313                         updateAreaMode();
 314
 315                         // Once we have the offset for where it would normally render, set the
 316                         // initial state of the (currently empty) notification area to be hidden.
 317                         $area.css( 'display', 'none' );
 318
 319                         $( window ).on( 'scroll', updateAreaMode );
 320
 321                         // Handle pre-ready queue.
 322                         isPageReady = true;
 323                         while ( preReadyNotifQueue.length ) {
 324                                 notif = preReadyNotifQueue.shift();
 325                                 notif.start();
 326                         }
 327                 } );
 328         }
 329
 330         /**
 331          * @class mw.notification
 332          * @singleton
 333          */
 334         notification = {
 335                 /**
 336                  * Pause auto-hide timers for all notifications.
 337                  * Notifications will not auto-hide until resume is called.
 338                  *
 339                  * @see mw.Notification#pause
 340                  */
 341                 pause: function () {
 342                         callEachNotification(
 343                                 $area.children( '.mw-notification' ),
 344                                 'pause'
 345                         );
 346                 },
 347
 348                 /**
 349                  * Resume any paused auto-hide timers from the beginning.
 350                  * Only the first #autoHideLimit timers will be resumed.
 351                  */
 352                 resume: function () {
 353                         callEachNotification(
 354                                 // Only call resume on the first #autoHideLimit notifications.
 355                                 // Exclude noautohide notifications to avoid bugs where #autoHideLimit
 356                                 // `{ autoHide: false }` notifications are at the start preventing any
 357                                 // auto-hide notifications from being autohidden.
 358                                 $area.children( '.mw-notification-autohide' ).slice( 0, notification.autoHideLimit ),
 359                                 'resume'
 360                         );
 361                 },
 362
 363                 /**
 364                  * Display a notification message to the user.
 365                  *
 366                  * @param {HTMLElement|HTMLElement[]|jQuery|mw.Message|string} message
 367                  * @param {Object} options The options to use for the notification.
 368                  *  See #defaults for details.
 369                  * @return {mw.Notification} Notification object
 370                  */
 371                 notify: function ( message, options ) {
 372                         var notif;
 373                         options = $.extend( {}, notification.defaults, options );
 374
 375                         notif = new Notification( message, options );
 376
 377                         if ( isPageReady ) {
 378                                 notif.start();
 379                         } else {
 380                                 preReadyNotifQueue.push( notif );
 381                         }
 382
 383                         return notif;
 384                 },
 385
 386                 /**
 387                  * @property {Object}
 388                  * The defaults for #notify options parameter.
 389                  *
 390                  * - autoHide:
 391                  *   A boolean indicating whether the notifification should automatically
 392                  *   be hidden after shown. Or if it should persist.
 393                  *
 394                  * - autoHideSeconds:
 395                  *   Key to #autoHideSeconds for number of seconds for timeout of auto-hide
 396                  *   notifications.
 397                  *
 398                  * - tag:
 399                  *   An optional string. When a notification is tagged only one message
 400                  *   with that tag will be displayed. Trying to display a new notification
 401                  *   with the same tag as one already being displayed will cause the other
 402                  *   notification to be closed and this new notification to open up inside
 403                  *   the same place as the previous notification.
 404                  *
 405                  * - title:
 406                  *   An optional title for the notification. Will be displayed above the
 407                  *   content. Usually in bold.
 408                  *
 409                  * - type:
 410                  *   An optional string for the type of the message used for styling:
 411                  *   Examples: 'info', 'warn', 'error'.
 412                  */
 413                 defaults: {
 414                         autoHide: true,
 415                         autoHideSeconds: 'short',
 416                         tag: null,
 417                         title: null,
 418                         type: null
 419                 },
 420
 421                 /**
 422                  * @private
 423                  * @property {Object}
 424                  */
 425                 autoHideSeconds: {
 426                         'short': 5,
 427                         'long': 30
 428                 },
 429
 430                 /**
 431                  * @property {number}
 432                  * Maximum number of simultaneous notifications to start auto-hide timers for.
 433                  * Only this number of notifications being displayed will be auto-hidden at one time.
 434                  * Any additional notifications in the list will only start counting their timeout for
 435                  * auto-hiding after the previous messages have been closed.
 436                  *
 437                  * This basically represents the minimal number of notifications the user should
 438                  * be able to process during the {@link #defaults default} #autoHideSeconds time.
 439                  */
 440                 autoHideLimit: 3
 441         };
 442
 443         $( init );
 444
 445         mw.notification = notification;
 446
 447 }( mediaWiki, jQuery ) );