resources/src/mediawiki.notification/notification.js

   1 ( function () {
   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>' )
  33                         .data( 'mw-notification', this )
  34                         .addClass( [
  35                                 'mw-notification',
  36                                 options.autoHide ? 'mw-notification-autohide' : 'mw-notification-noautohide'
  37                         ] );
  38
  39                 if ( options.tag ) {
  40                         // Sanitize options.tag before it is used by any code. (Including Notification class methods)
  41                         options.tag = options.tag.replace( /[ _-]+/g, '-' ).replace( /[^-a-z0-9]+/ig, '' );
  42                         if ( options.tag ) {
  43                                 $notification.addClass( 'mw-notification-tag-' + options.tag );
  44                         } else {
  45                                 delete options.tag;
  46                         }
  47                 }
  48
  49                 if ( options.type ) {
  50                         // Sanitize options.type
  51                         options.type = options.type.replace( /[ _-]+/g, '-' ).replace( /[^-a-z0-9]+/ig, '' );
  52                         $notification.addClass( 'mw-notification-type-' + options.type );
  53                 }
  54
  55                 if ( options.title ) {
  56                         $( '<div>' )
  57                                 .addClass( 'mw-notification-title' )
  58                                 .text( options.title )
  59                                 .appendTo( $notification );
  60                 }
  61
  62                 $notificationContent = $( '<div>' ).addClass( 'mw-notification-content' );
  63
  64                 if ( typeof message === 'object' ) {
  65                         // Handle mw.Message objects separately from DOM nodes and jQuery objects
  66                         if ( message instanceof mw.Message ) {
  67                                 $notificationContent.html( message.parse() );
  68                         } else {
  69                                 $notificationContent.append( message );
  70                         }
  71                 } else {
  72                         $notificationContent.text( message );
  73                 }
  74
  75                 $notificationContent.appendTo( $notification );
  76
  77                 // Private state parameters, meant for internal use only
  78                 // autoHideSeconds: String alias for number of seconds for timeout of auto-hiding notifications.
  79                 // isOpen: Set to true after .start() is called to avoid double calls.
  80                 //         Set back to false after .close() to avoid duplicating the close animation.
  81                 // isPaused: false after .resume(), true after .pause(). Avoids duplicating or breaking the hide timeouts.
  82                 //           Set to true initially so .start() can call .resume().
  83                 // message: The message passed to the notification. Unused now but may be used in the future
  84                 //          to stop replacement of a tagged notification with another notification using the same message.
  85                 // options: The options passed to the notification with a little sanitization. Used by various methods.
  86                 // $notification: jQuery object containing the notification DOM node.
  87                 // timeout: Holds appropriate methods to set/clear timeouts
  88                 this.autoHideSeconds = options.autoHideSeconds &&
  89                         notification.autoHideSeconds[ options.autoHideSeconds ] ||
  90                         notification.autoHideSeconds.short;
  91                 this.isOpen = false;
  92                 this.isPaused = true;
  93                 this.message = message;
  94                 this.options = options;
  95                 this.$notification = $notification;
  96                 if ( options.visibleTimeout ) {
  97                         this.timeout = require( 'mediawiki.visibleTimeout' );
  98                 } else {
  99                         this.timeout = {
 100                                 set: setTimeout,
 101                                 clear: clearTimeout
 102                         };
 103                 }
 104         }
 105
 106         /**
 107          * Start the notification. Called automatically by mw.notification#notify
 108          * (possibly asynchronously on document-ready).
 109          *
 110          * This inserts the notification into the page, closes any matching tagged notifications,
 111          * handles the fadeIn animations and replacement transitions, and starts autoHide timers.
 112          *
 113          * @private
 114          */
 115         Notification.prototype.start = function () {
 116                 var options, $notification, $tagMatches, autohideCount;
 117
 118                 $area.css( 'display', '' );
 119
 120                 if ( this.isOpen ) {
 121                         return;
 122                 }
 123
 124                 this.isOpen = true;
 125                 openNotificationCount++;
 126
 127                 options = this.options;
 128                 $notification = this.$notification;
 129
 130                 if ( options.tag ) {
 131                         // Find notifications with the same tag
 132                         $tagMatches = $area.find( '.mw-notification-tag-' + options.tag );
 133                 }
 134
 135                 // If we found existing notification with the same tag, replace them
 136                 if ( options.tag && $tagMatches.length ) {
 137
 138                         // While there can be only one "open" notif with a given tag, there can be several
 139                         // matches here because they remain in the DOM until the animation is finished.
 140                         $tagMatches.each( function () {
 141                                 var notif = $( this ).data( 'mw-notification' );
 142                                 if ( notif && notif.isOpen ) {
 143                                         // Detach from render flow with position absolute so that the new tag can
 144                                         // occupy its space instead.
 145                                         notif.$notification
 146                                                 .css( {
 147                                                         position: 'absolute',
 148                                                         width: notif.$notification.width()
 149                                                 } )
 150                                                 .css( notif.$notification.position() )
 151                                                 .addClass( 'mw-notification-replaced' );
 152                                         notif.close();
 153                                 }
 154                         } );
 155
 156                         $notification
 157                                 .insertBefore( $tagMatches.first() )
 158                                 .addClass( 'mw-notification-visible' );
 159                 } else {
 160                         $area.append( $notification );
 161                         rAF( function () {
 162                                 // This frame renders the element in the area (invisible)
 163                                 rAF( function () {
 164                                         $notification.addClass( 'mw-notification-visible' );
 165                                 } );
 166                         } );
 167                 }
 168
 169                 // By default a notification is paused.
 170                 // If this notification is within the first {autoHideLimit} notifications then
 171                 // start the auto-hide timer as soon as it's created.
 172                 autohideCount = $area.find( '.mw-notification-autohide' ).length;
 173                 if ( autohideCount <= notification.autoHideLimit ) {
 174                         this.resume();
 175                 }
 176         };
 177
 178         /**
 179          * Pause any running auto-hide timer for this notification
 180          */
 181         Notification.prototype.pause = function () {
 182                 if ( this.isPaused ) {
 183                         return;
 184                 }
 185                 this.isPaused = true;
 186
 187                 if ( this.timeoutId ) {
 188                         this.timeout.clear( this.timeoutId );
 189                         delete this.timeoutId;
 190                 }
 191         };
 192
 193         /**
 194          * Start autoHide timer if not already started.
 195          * Does nothing if autoHide is disabled.
 196          * Either to resume from pause or to make the first start.
 197          */
 198         Notification.prototype.resume = function () {
 199                 var notif = this;
 200
 201                 if ( !notif.isPaused ) {
 202                         return;
 203                 }
 204                 // Start any autoHide timeouts
 205                 if ( notif.options.autoHide ) {
 206                         notif.isPaused = false;
 207                         notif.timeoutId = notif.timeout.set( function () {
 208                                 // Already finished, so don't try to re-clear it
 209                                 delete notif.timeoutId;
 210                                 notif.close();
 211                         }, this.autoHideSeconds * 1000 );
 212                 }
 213         };
 214
 215         /**
 216          * Close the notification.
 217          */
 218         Notification.prototype.close = function () {
 219                 var notif = this;
 220
 221                 if ( !this.isOpen ) {
 222                         return;
 223                 }
 224
 225                 this.isOpen = false;
 226                 openNotificationCount--;
 227
 228                 // Clear any remaining timeout on close
 229                 this.pause();
 230
 231                 // Remove the mw-notification-autohide class from the notification to avoid
 232                 // having a half-closed notification counted as a notification to resume
 233                 // when handling {autoHideLimit}.
 234                 this.$notification.removeClass( 'mw-notification-autohide' );
 235
 236                 // Now that a notification is being closed. Start auto-hide timers for any
 237                 // notification that has now become one of the first {autoHideLimit} notifications.
 238                 notification.resume();
 239
 240                 rAF( function () {
 241                         notif.$notification.removeClass( 'mw-notification-visible' );
 242
 243                         setTimeout( function () {
 244                                 if ( openNotificationCount === 0 ) {
 245                                         // Hide the area after the last notification closes. Otherwise, the padding on
 246                                         // the area can be obscure content, despite the area being empty/invisible (T54659). // FIXME
 247                                         $area.css( 'display', 'none' );
 248                                         notif.$notification.remove();
 249                                 } else {
 250                                         notif.$notification.slideUp( 'fast', function () {
 251                                                 $( this ).remove();
 252                                         } );
 253                                 }
 254                         }, 500 );
 255                 } );
 256         };
 257
 258         /**
 259          * Helper function, take a list of notification divs and call
 260          * a function on the Notification instance attached to them.
 261          *
 262          * @private
 263          * @static
 264          * @param {jQuery} $notifications A jQuery object containing notification divs
 265          * @param {string} fn The name of the function to call on the Notification instance
 266          */
 267         function callEachNotification( $notifications, fn ) {
 268                 $notifications.each( function () {
 269                         var notif = $( this ).data( 'mw-notification' );
 270                         if ( notif ) {
 271                                 notif[ fn ]();
 272                         }
 273                 } );
 274         }
 275
 276         /**
 277          * Initialisation.
 278          * Must only be called once, and not before the document is ready.
 279          *
 280          * @ignore
 281          */
 282         function init() {
 283                 var offset, notif,
 284                         isFloating = false;
 285
 286                 function updateAreaMode() {
 287                         var shouldFloat = window.pageYOffset > offset.top;
 288                         if ( isFloating === shouldFloat ) {
 289                                 return;
 290                         }
 291                         isFloating = shouldFloat;
 292                         $area
 293                                 .toggleClass( 'mw-notification-area-floating', isFloating )
 294                                 .toggleClass( 'mw-notification-area-layout', !isFloating );
 295                 }
 296
 297                 // Look for a preset notification area in the skin.
 298                 // 'data-mw*' attributes are banned from user content in Sanitizer.
 299                 $area = $( '.mw-notification-area[data-mw="interface"]' ).first();
 300                 if ( !$area.length ) {
 301                         $area = $( '<div>' ).addClass( 'mw-notification-area' );
 302                         // Prepend the notification area to the content area
 303                         mw.util.$content.prepend( $area );
 304                 }
 305                 $area
 306                         .addClass( 'mw-notification-area-layout' )
 307                         // The ID attribute here is deprecated.
 308                         .attr( 'id', 'mw-notification-area' )
 309                         // Pause auto-hide timers when the mouse is in the notification area.
 310                         .on( {
 311                                 mouseenter: notification.pause,
 312                                 mouseleave: notification.resume
 313                         } )
 314                         // When clicking on a notification close it.
 315                         .on( 'click', '.mw-notification', function () {
 316                                 var notif = $( this ).data( 'mw-notification' );
 317                                 if ( notif ) {
 318                                         notif.close();
 319                                 }
 320                         } )
 321                         // Stop click events from <a> tags from propogating to prevent clicking.
 322                         // on links from hiding a notification.
 323                         .on( 'click', 'a', function ( e ) {
 324                                 e.stopPropagation();
 325                         } );
 326
 327                 // Read from the DOM:
 328                 // Must be in the next frame to avoid synchronous layout
 329                 // computation from offset()/getBoundingClientRect().
 330                 rAF( function () {
 331                         offset = $area.offset();
 332
 333                         // Initial mode (reads, and then maybe writes)
 334                         updateAreaMode();
 335
 336                         // Once we have the offset for where it would normally render, set the
 337                         // initial state of the (currently empty) notification area to be hidden.
 338                         $area.css( 'display', 'none' );
 339
 340                         $( window ).on( 'scroll', updateAreaMode );
 341
 342                         // Handle pre-ready queue.
 343                         isPageReady = true;
 344                         while ( preReadyNotifQueue.length ) {
 345                                 notif = preReadyNotifQueue.shift();
 346                                 notif.start();
 347                         }
 348                 } );
 349         }
 350
 351         /**
 352          * @class mw.notification
 353          * @singleton
 354          */
 355         notification = {
 356                 /**
 357                  * Pause auto-hide timers for all notifications.
 358                  * Notifications will not auto-hide until resume is called.
 359                  *
 360                  * @see mw.Notification#pause
 361                  */
 362                 pause: function () {
 363                         callEachNotification(
 364                                 $area.children( '.mw-notification' ),
 365                                 'pause'
 366                         );
 367                 },
 368
 369                 /**
 370                  * Resume any paused auto-hide timers from the beginning.
 371                  * Only the first #autoHideLimit timers will be resumed.
 372                  */
 373                 resume: function () {
 374                         callEachNotification(
 375                                 // Only call resume on the first #autoHideLimit notifications.
 376                                 // Exclude noautohide notifications to avoid bugs where #autoHideLimit
 377                                 // `{ autoHide: false }` notifications are at the start preventing any
 378                                 // auto-hide notifications from being autohidden.
 379                                 $area.children( '.mw-notification-autohide' ).slice( 0, notification.autoHideLimit ),
 380                                 'resume'
 381                         );
 382                 },
 383
 384                 /**
 385                  * Display a notification message to the user.
 386                  *
 387                  * @param {HTMLElement|HTMLElement[]|jQuery|mw.Message|string} message
 388                  * @param {Object} options The options to use for the notification.
 389                  *  See #defaults for details.
 390                  * @return {mw.Notification} Notification object
 391                  */
 392                 notify: function ( message, options ) {
 393                         var notif;
 394                         options = $.extend( {}, notification.defaults, options );
 395
 396                         notif = new Notification( message, options );
 397
 398                         if ( isPageReady ) {
 399                                 notif.start();
 400                         } else {
 401                                 preReadyNotifQueue.push( notif );
 402                         }
 403
 404                         return notif;
 405                 },
 406
 407                 /**
 408                  * @property {Object}
 409                  * The defaults for #notify options parameter.
 410                  *
 411                  * - autoHide:
 412                  *   A boolean indicating whether the notifification should automatically
 413                  *   be hidden after shown. Or if it should persist.
 414                  *
 415                  * - autoHideSeconds:
 416                  *   Key to #autoHideSeconds for number of seconds for timeout of auto-hide
 417                  *   notifications.
 418                  *
 419                  * - tag:
 420                  *   An optional string. When a notification is tagged only one message
 421                  *   with that tag will be displayed. Trying to display a new notification
 422                  *   with the same tag as one already being displayed will cause the other
 423                  *   notification to be closed and this new notification to open up inside
 424                  *   the same place as the previous notification.
 425                  *
 426                  * - title:
 427                  *   An optional title for the notification. Will be displayed above the
 428                  *   content. Usually in bold.
 429                  *
 430                  * - type:
 431                  *   An optional string for the type of the message used for styling:
 432                  *   Examples: 'info', 'warn', 'error'.
 433                  *
 434                  * - visibleTimeout:
 435                  *   A boolean indicating if the autoHide timeout should be based on
 436                  *   time the page was visible to user. Or if it should use wall clock time.
 437                  */
 438                 defaults: {
 439                         autoHide: true,
 440                         autoHideSeconds: 'short',
 441                         tag: null,
 442                         title: null,
 443                         type: null,
 444                         visibleTimeout: true
 445                 },
 446
 447                 /**
 448                  * @private
 449                  * @property {Object}
 450                  */
 451                 autoHideSeconds: {
 452                         short: 5,
 453                         long: 30
 454                 },
 455
 456                 /**
 457                  * @property {number}
 458                  * Maximum number of simultaneous notifications to start auto-hide timers for.
 459                  * Only this number of notifications being displayed will be auto-hidden at one time.
 460                  * Any additional notifications in the list will only start counting their timeout for
 461                  * auto-hiding after the previous messages have been closed.
 462                  *
 463                  * This basically represents the minimal number of notifications the user should
 464                  * be able to process during the {@link #defaults default} #autoHideSeconds time.
 465                  */
 466                 autoHideLimit: 3
 467         };
 468
 469         $( init );
 470
 471         mw.notification = notification;
 472
 473 }() );