resources/src/mediawiki.widgets/mw.widgets.DateInputWidget.js

   1 /*!
   2  * MediaWiki Widgets – DateInputWidget class.
   3  *
   4  * @copyright 2011-2015 MediaWiki Widgets Team and others; see AUTHORS.txt
   5  * @license The MIT License (MIT); see LICENSE.txt
   6  */
   7 /* global moment */
   8 ( function ( $, mw ) {
   9
  10         /**
  11          * Creates an mw.widgets.DateInputWidget object.
  12          *
  13          *     @example
  14          *     // Date input widget showcase
  15          *     var fieldset = new OO.ui.FieldsetLayout( {
  16          *       items: [
  17          *         new OO.ui.FieldLayout(
  18          *           new mw.widgets.DateInputWidget(),
  19          *           {
  20          *             align: 'top',
  21          *             label: 'Select date'
  22          *           }
  23          *         ),
  24          *         new OO.ui.FieldLayout(
  25          *           new mw.widgets.DateInputWidget( { precision: 'month' } ),
  26          *           {
  27          *             align: 'top',
  28          *             label: 'Select month'
  29          *           }
  30          *         ),
  31          *         new OO.ui.FieldLayout(
  32          *           new mw.widgets.DateInputWidget( {
  33          *             inputFormat: 'DD.MM.YYYY',
  34          *             displayFormat: 'Do [of] MMMM [anno Domini] YYYY'
  35          *           } ),
  36          *           {
  37          *             align: 'top',
  38          *             label: 'Select date (custom formats)'
  39          *           }
  40          *         )
  41          *       ]
  42          *     } );
  43          *     $( 'body' ).append( fieldset.$element );
  44          *
  45          * The value is stored in 'YYYY-MM-DD' or 'YYYY-MM' format:
  46          *
  47          *     @example
  48          *     // Accessing values in a date input widget
  49          *     var dateInput = new mw.widgets.DateInputWidget();
  50          *     var $label = $( '<p>' );
  51          *     $( 'body' ).append( $label, dateInput.$element );
  52          *     dateInput.on( 'change', function () {
  53          *       // The value will always be a valid date or empty string, malformed input is ignored
  54          *       var date = dateInput.getValue();
  55          *       $label.text( 'Selected date: ' + ( date || '(none)' ) );
  56          *     } );
  57          *
  58          * @class
  59          * @extends OO.ui.InputWidget
  60          * @mixins OO.ui.mixin.IndicatorElement
  61          *
  62          * @constructor
  63          * @param {Object} [config] Configuration options
  64          * @cfg {string} [precision='day'] Date precision to use, 'day' or 'month'
  65          * @cfg {string} [value] Day or month date (depending on `precision`), in the format 'YYYY-MM-DD'
  66          *     or 'YYYY-MM'. If not given or empty string, no date is selected.
  67          * @cfg {string} [inputFormat] Date format string to use for the textual input field. Displayed
  68          *     while the widget is active, and the user can type in a date in this format. Should be short
  69          *     and easy to type. When not given, defaults to 'YYYY-MM-DD' or 'YYYY-MM', depending on
  70          *     `precision`.
  71          * @cfg {string} [displayFormat] Date format string to use for the clickable label. Displayed
  72          *     while the widget is inactive. Should be as unambiguous as possible (for example, prefer to
  73          *     spell out the month, rather than rely on the order), even if that makes it longer. When not
  74          *     given, the default is language-specific.
  75          * @cfg {string} [placeholderLabel=No date selected] Placeholder text shown when the widget is not
  76          *     selected. Default text taken from message `mw-widgets-dateinput-no-date`.
  77          * @cfg {string} [placeholderDateFormat] User-visible date format string displayed in the textual input
  78          *     field when it's empty. Should be the same as `inputFormat`, but translated to the user's
  79          *     language. When not given, defaults to a translated version of 'YYYY-MM-DD' or 'YYYY-MM',
  80          *     depending on `precision`.
  81          * @cfg {boolean} [required=false] Mark the field as required. Implies `indicator: 'required'`.
  82          * @cfg {string} [mustBeAfter] Validates the date to be after this. In the 'YYYY-MM-DD' format.
  83          * @cfg {string} [mustBeBefore] Validates the date to be before this. In the 'YYYY-MM-DD' format.
  84          * @cfg {jQuery} [$overlay] Render the calendar into a separate layer. This configuration is
  85          *     useful in cases where the expanded calendar is larger than its container. The specified
  86          *     overlay layer is usually on top of the container and has a larger area. By default, the
  87          *     calendar uses relative positioning.
  88          */
  89         mw.widgets.DateInputWidget = function MWWDateInputWidget( config ) {
  90                 var placeholderDateFormat, mustBeAfter, mustBeBefore;
  91
  92                 // Config initialization
  93                 config = $.extend( {
  94                         precision: 'day',
  95                         required: false,
  96                         placeholderLabel: mw.msg( 'mw-widgets-dateinput-no-date' )
  97                 }, config );
  98                 if ( config.required ) {
  99                         if ( config.indicator === undefined ) {
 100                                 config.indicator = 'required';
 101                         }
 102                 }
 103
 104                 if ( config.placeholderDateFormat ) {
 105                         placeholderDateFormat = config.placeholderDateFormat;
 106                 } else if ( config.inputFormat ) {
 107                         // We have no way to display a translated placeholder for custom formats
 108                         placeholderDateFormat = '';
 109                 } else {
 110                         // Messages: mw-widgets-dateinput-placeholder-day, mw-widgets-dateinput-placeholder-month
 111                         placeholderDateFormat = mw.msg( 'mw-widgets-dateinput-placeholder-' + config.precision );
 112                 }
 113
 114                 // Properties (must be set before parent constructor, which calls #setValue)
 115                 this.$handle = $( '<div>' );
 116                 this.label = new OO.ui.LabelWidget();
 117                 this.textInput = new OO.ui.TextInputWidget( {
 118                         required: config.required,
 119                         placeholder: placeholderDateFormat,
 120                         validate: this.validateDate.bind( this )
 121                 } );
 122                 this.calendar = new mw.widgets.CalendarWidget( {
 123                         lazyInitOnToggle: true,
 124                         // Can't pass `$floatableContainer: this.$element` here, the latter is not set yet.
 125                         // Instead we call setFloatableContainer() below.
 126                         precision: config.precision
 127                 } );
 128                 this.inCalendar = 0;
 129                 this.inTextInput = 0;
 130                 this.inputFormat = config.inputFormat;
 131                 this.displayFormat = config.displayFormat;
 132                 this.required = config.required;
 133                 this.placeholderLabel = config.placeholderLabel;
 134
 135                 // Validate and set min and max dates as properties
 136                 if ( config.mustBeAfter !== undefined ) {
 137                         mustBeAfter = moment( config.mustBeAfter, 'YYYY-MM-DD' );
 138                         if ( mustBeAfter.isValid() ) {
 139                                 this.mustBeAfter = mustBeAfter;
 140                         }
 141                 }
 142                 if ( config.mustBeBefore !== undefined ) {
 143                         mustBeBefore = moment( config.mustBeBefore, 'YYYY-MM-DD' );
 144                         if ( mustBeBefore.isValid() ) {
 145                                 this.mustBeBefore = mustBeBefore;
 146                         }
 147                 }
 148
 149                 // Parent constructor
 150                 mw.widgets.DateInputWidget.parent.call( this, config );
 151
 152                 // Mixin constructors
 153                 OO.ui.mixin.IndicatorElement.call( this, config );
 154
 155                 // Events
 156                 this.calendar.connect( this, {
 157                         change: 'onCalendarChange'
 158                 } );
 159                 this.textInput.connect( this, {
 160                         enter: 'onEnter',
 161                         change: 'onTextInputChange'
 162                 } );
 163                 this.$element.on( {
 164                         focusout: this.onBlur.bind( this )
 165                 } );
 166                 this.calendar.$element.on( {
 167                         click: this.onCalendarClick.bind( this ),
 168                         keypress: this.onCalendarKeyPress.bind( this )
 169                 } );
 170                 this.$handle.on( {
 171                         click: this.onClick.bind( this ),
 172                         keypress: this.onKeyPress.bind( this )
 173                 } );
 174
 175                 // Initialization
 176                 // Move 'tabindex' from this.$input (which is invisible) to the visible handle
 177                 this.setTabIndexedElement( this.$handle );
 178                 this.$handle
 179                         .append( this.label.$element, this.$indicator )
 180                         .addClass( 'mw-widget-dateInputWidget-handle' );
 181                 this.calendar.$element
 182                         .addClass( 'mw-widget-dateInputWidget-calendar' );
 183                 this.$element
 184                         .addClass( 'mw-widget-dateInputWidget' )
 185                         .append( this.$handle, this.textInput.$element, this.calendar.$element );
 186
 187                 // config.overlay is the selector to be used for config.$overlay, specified from PHP
 188                 if ( config.overlay ) {
 189                         config.$overlay = $( config.overlay );
 190                 }
 191
 192                 if ( config.$overlay ) {
 193                         this.calendar.setFloatableContainer( this.$element );
 194                         config.$overlay.append( this.calendar.$element );
 195
 196                         // The text input and calendar are not in DOM order, so fix up focus transitions.
 197                         this.textInput.$input.on( 'keydown', function ( e ) {
 198                                 if ( e.which === OO.ui.Keys.TAB ) {
 199                                         if ( e.shiftKey ) {
 200                                                 // Tabbing backward from text input: normal browser behavior
 201                                                 $.noop();
 202                                         } else {
 203                                                 // Tabbing forward from text input: just focus the calendar
 204                                                 this.calendar.$element.focus();
 205                                                 return false;
 206                                         }
 207                                 }
 208                         }.bind( this ) );
 209                         this.calendar.$element.on( 'keydown', function ( e ) {
 210                                 if ( e.which === OO.ui.Keys.TAB ) {
 211                                         if ( e.shiftKey ) {
 212                                                 // Tabbing backward from calendar: just focus the text input
 213                                                 this.textInput.$input.focus();
 214                                                 return false;
 215                                         } else {
 216                                                 // Tabbing forward from calendar: focus the text input, then allow normal browser
 217                                                 // behavior to move focus to next focusable after it
 218                                                 this.textInput.$input.focus();
 219                                         }
 220                                 }
 221                         }.bind( this ) );
 222                 }
 223
 224                 // Set handle label and hide stuff
 225                 this.updateUI();
 226                 this.textInput.toggle( false );
 227                 this.calendar.toggle( false );
 228
 229                 // Hide unused <input> from PHP after infusion is done
 230                 // See InputWidget#reusePreInfuseDOM about config.$input
 231                 if ( config.$input ) {
 232                         config.$input.addClass( 'oo-ui-element-hidden' );
 233                 }
 234         };
 235
 236         /* Inheritance */
 237
 238         OO.inheritClass( mw.widgets.DateInputWidget, OO.ui.InputWidget );
 239         OO.mixinClass( mw.widgets.DateInputWidget, OO.ui.mixin.IndicatorElement );
 240
 241         /* Methods */
 242
 243         /**
 244          * @inheritdoc
 245          * @protected
 246          */
 247         mw.widgets.DateInputWidget.prototype.getInputElement = function () {
 248                 return $( '<input>' ).attr( 'type', 'hidden' );
 249         };
 250
 251         /**
 252          * Respond to calendar date change events.
 253          *
 254          * @private
 255          */
 256         mw.widgets.DateInputWidget.prototype.onCalendarChange = function () {
 257                 this.inCalendar++;
 258                 if ( !this.inTextInput ) {
 259                         // If this is caused by user typing in the input field, do not set anything.
 260                         // The value may be invalid (see #onTextInputChange), but displayable on the calendar.
 261                         this.setValue( this.calendar.getDate() );
 262                 }
 263                 this.inCalendar--;
 264         };
 265
 266         /**
 267          * Respond to text input value change events.
 268          *
 269          * @private
 270          */
 271         mw.widgets.DateInputWidget.prototype.onTextInputChange = function () {
 272                 var mom,
 273                         widget = this,
 274                         value = this.textInput.getValue(),
 275                         valid = this.isValidDate( value );
 276                 this.inTextInput++;
 277
 278                 if ( value === '' ) {
 279                         // No date selected
 280                         widget.setValue( '' );
 281                 } else if ( valid ) {
 282                         // Well-formed date value, parse and set it
 283                         mom = moment( value, widget.getInputFormat() );
 284                         // Use English locale to avoid number formatting
 285                         widget.setValue( mom.locale( 'en' ).format( widget.getInternalFormat() ) );
 286                 } else {
 287                         // Not well-formed, but possibly partial? Try updating the calendar, but do not set the
 288                         // internal value. Generally this only makes sense when 'inputFormat' is little-endian (e.g.
 289                         // 'YYYY-MM-DD'), but that's hard to check for, and might be difficult to handle the parsing
 290                         // right for weird formats. So limit this trick to only when we're using the default
 291                         // 'inputFormat', which is the same as the internal format, 'YYYY-MM-DD'.
 292                         if ( widget.getInputFormat() === widget.getInternalFormat() ) {
 293                                 widget.calendar.setDate( widget.textInput.getValue() );
 294                         }
 295                 }
 296                 widget.inTextInput--;
 297
 298         };
 299
 300         /**
 301          * @inheritdoc
 302          */
 303         mw.widgets.DateInputWidget.prototype.setValue = function ( value ) {
 304                 var oldValue = this.value;
 305
 306                 if ( !moment( value, this.getInternalFormat() ).isValid() ) {
 307                         value = '';
 308                 }
 309
 310                 mw.widgets.DateInputWidget.parent.prototype.setValue.call( this, value );
 311
 312                 if ( this.value !== oldValue ) {
 313                         this.updateUI();
 314                         this.setValidityFlag();
 315                 }
 316
 317                 return this;
 318         };
 319
 320         /**
 321          * Handle text input and calendar blur events.
 322          *
 323          * @private
 324          */
 325         mw.widgets.DateInputWidget.prototype.onBlur = function () {
 326                 var widget = this;
 327                 setTimeout( function () {
 328                         var $focussed = $( ':focus' );
 329                         // Deactivate unless the focus moved to something else inside this widget
 330                         if (
 331                                 !OO.ui.contains( widget.$element[ 0 ], $focussed[ 0 ], true ) &&
 332                                 // Calendar might be in an $overlay
 333                                 !OO.ui.contains( widget.calendar.$element[ 0 ], $focussed[ 0 ], true )
 334                         ) {
 335                                 widget.deactivate();
 336                         }
 337                 }, 0 );
 338         };
 339
 340         /**
 341          * @inheritdoc
 342          */
 343         mw.widgets.DateInputWidget.prototype.focus = function () {
 344                 this.activate();
 345                 return this;
 346         };
 347
 348         /**
 349          * @inheritdoc
 350          */
 351         mw.widgets.DateInputWidget.prototype.blur = function () {
 352                 this.deactivate();
 353                 return this;
 354         };
 355
 356         /**
 357          * Update the contents of the label, text input and status of calendar to reflect selected value.
 358          *
 359          * @private
 360          */
 361         mw.widgets.DateInputWidget.prototype.updateUI = function () {
 362                 var moment;
 363                 if ( this.getValue() === '' ) {
 364                         this.textInput.setValue( '' );
 365                         this.calendar.setDate( null );
 366                         this.label.setLabel( this.placeholderLabel );
 367                         this.$element.addClass( 'mw-widget-dateInputWidget-empty' );
 368                 } else {
 369                         moment = this.getMoment();
 370                         if ( !this.inTextInput ) {
 371                                 this.textInput.setValue( moment.format( this.getInputFormat() ) );
 372                         }
 373                         if ( !this.inCalendar ) {
 374                                 this.calendar.setDate( this.getValue() );
 375                         }
 376                         this.label.setLabel( moment.format( this.getDisplayFormat() ) );
 377                         this.$element.removeClass( 'mw-widget-dateInputWidget-empty' );
 378                 }
 379         };
 380
 381         /**
 382          * Deactivate this input field for data entry. Closes the calendar and hides the text field.
 383          *
 384          * @private
 385          */
 386         mw.widgets.DateInputWidget.prototype.deactivate = function () {
 387                 this.$element.removeClass( 'mw-widget-dateInputWidget-active' );
 388                 this.$handle.show();
 389                 this.textInput.toggle( false );
 390                 this.calendar.toggle( false );
 391                 this.setValidityFlag();
 392         };
 393
 394         /**
 395          * Activate this input field for data entry. Opens the calendar and shows the text field.
 396          *
 397          * @private
 398          */
 399         mw.widgets.DateInputWidget.prototype.activate = function () {
 400                 this.calendar.resetUI();
 401                 this.$element.addClass( 'mw-widget-dateInputWidget-active' );
 402                 this.$handle.hide();
 403                 this.textInput.toggle( true );
 404                 this.calendar.toggle( true );
 405
 406                 this.textInput.$input.focus();
 407         };
 408
 409         /**
 410          * Get the date format to be used for handle label when the input is inactive.
 411          *
 412          * @private
 413          * @return {string} Format string
 414          */
 415         mw.widgets.DateInputWidget.prototype.getDisplayFormat = function () {
 416                 var localeData, llll, lll, ll, format;
 417
 418                 if ( this.displayFormat !== undefined ) {
 419                         return this.displayFormat;
 420                 }
 421
 422                 if ( this.calendar.getPrecision() === 'month' ) {
 423                         return 'MMMM YYYY';
 424                 } else {
 425                         // The formats Moment.js provides:
 426                         // * ll:   Month name, day of month, year
 427                         // * lll:  Month name, day of month, year, time
 428                         // * llll: Month name, day of month, day of week, year, time
 429                         //
 430                         // The format we want:
 431                         // * ????: Month name, day of month, day of week, year
 432                         //
 433                         // We try to construct it as 'llll - (lll - ll)' and hope for the best.
 434                         // This seems to work well for many languages (maybe even all?).
 435
 436                         localeData = moment.localeData( moment.locale() );
 437                         llll = localeData.longDateFormat( 'llll' );
 438                         lll = localeData.longDateFormat( 'lll' );
 439                         ll = localeData.longDateFormat( 'll' );
 440                         format = llll.replace( lll.replace( ll, '' ), '' );
 441
 442                         return format;
 443                 }
 444         };
 445
 446         /**
 447          * Get the date format to be used for the text field when the input is active.
 448          *
 449          * @private
 450          * @return {string} Format string
 451          */
 452         mw.widgets.DateInputWidget.prototype.getInputFormat = function () {
 453                 if ( this.inputFormat !== undefined ) {
 454                         return this.inputFormat;
 455                 }
 456
 457                 return {
 458                         day: 'YYYY-MM-DD',
 459                         month: 'YYYY-MM'
 460                 }[ this.calendar.getPrecision() ];
 461         };
 462
 463         /**
 464          * Get the date format to be used internally for the value. This is not configurable in any way,
 465          * and always either 'YYYY-MM-DD' or 'YYYY-MM'.
 466          *
 467          * @private
 468          * @return {string} Format string
 469          */
 470         mw.widgets.DateInputWidget.prototype.getInternalFormat = function () {
 471                 return {
 472                         day: 'YYYY-MM-DD',
 473                         month: 'YYYY-MM'
 474                 }[ this.calendar.getPrecision() ];
 475         };
 476
 477         /**
 478          * Get the Moment object for current value.
 479          *
 480          * @return {Object} Moment object
 481          */
 482         mw.widgets.DateInputWidget.prototype.getMoment = function () {
 483                 return moment( this.getValue(), this.getInternalFormat() );
 484         };
 485
 486         /**
 487          * Handle mouse click events.
 488          *
 489          * @private
 490          * @param {jQuery.Event} e Mouse click event
 491          * @return {boolean} False to cancel the default event
 492          */
 493         mw.widgets.DateInputWidget.prototype.onClick = function ( e ) {
 494                 if ( !this.isDisabled() && e.which === 1 ) {
 495                         this.activate();
 496                 }
 497                 return false;
 498         };
 499
 500         /**
 501          * Handle key press events.
 502          *
 503          * @private
 504          * @param {jQuery.Event} e Key press event
 505          * @return {boolean} False to cancel the default event
 506          */
 507         mw.widgets.DateInputWidget.prototype.onKeyPress = function ( e ) {
 508                 if ( !this.isDisabled() &&
 509                         ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
 510                 ) {
 511                         this.activate();
 512                         return false;
 513                 }
 514         };
 515
 516         /**
 517          * Handle calendar key press events.
 518          *
 519          * @private
 520          * @param {jQuery.Event} e Key press event
 521          * @return {boolean} False to cancel the default event
 522          */
 523         mw.widgets.DateInputWidget.prototype.onCalendarKeyPress = function ( e ) {
 524                 if ( !this.isDisabled() && e.which === OO.ui.Keys.ENTER ) {
 525                         this.deactivate();
 526                         this.$handle.focus();
 527                         return false;
 528                 }
 529         };
 530
 531         /**
 532          * Handle calendar click events.
 533          *
 534          * @private
 535          * @param {jQuery.Event} e Mouse click event
 536          * @return {boolean} False to cancel the default event
 537          */
 538         mw.widgets.DateInputWidget.prototype.onCalendarClick = function ( e ) {
 539                 if (
 540                         !this.isDisabled() &&
 541                         e.which === 1 &&
 542                         $( e.target ).hasClass( 'mw-widget-calendarWidget-day' )
 543                 ) {
 544                         this.deactivate();
 545                         this.$handle.focus();
 546                         return false;
 547                 }
 548         };
 549
 550         /**
 551          * Handle text input enter events.
 552          *
 553          * @private
 554          */
 555         mw.widgets.DateInputWidget.prototype.onEnter = function () {
 556                 this.deactivate();
 557                 this.$handle.focus();
 558         };
 559
 560         /**
 561          * @private
 562          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format or
 563          *     (unless the field is required) empty
 564          * @return {boolean}
 565          */
 566         mw.widgets.DateInputWidget.prototype.validateDate = function ( date ) {
 567                 var isValid;
 568                 if ( date === '' ) {
 569                         isValid = !this.required;
 570                 } else {
 571                         isValid = this.isValidDate( date ) && this.isInRange( date );
 572                 }
 573                 return isValid;
 574         };
 575
 576         /**
 577          * @private
 578          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format
 579          * @return {boolean}
 580          */
 581         mw.widgets.DateInputWidget.prototype.isValidDate = function ( date ) {
 582                 // "Half-strict mode": for example, for the format 'YYYY-MM-DD', 2015-1-3 instead of 2015-01-03
 583                 // is okay, but 2015-01 isn't, and neither is 2015-01-foo. Use Moment's "fuzzy" mode and check
 584                 // parsing flags for the details (stolen from implementation of moment#isValid).
 585                 var
 586                         mom = moment( date, this.getInputFormat() ),
 587                         flags = mom.parsingFlags();
 588
 589                 return mom.isValid() && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0;
 590         };
 591
 592         /**
 593          * Validates if the date is within the range configured with {@link #cfg-mustBeAfter}
 594          * and {@link #cfg-mustBeBefore}.
 595          *
 596          * @private
 597          * @param {string} date Date string, to be valid, must be empty (no date selected) or in
 598          *     'YYYY-MM-DD' or 'YYYY-MM' format to be valid
 599          * @return {boolean}
 600          */
 601         mw.widgets.DateInputWidget.prototype.isInRange = function ( date ) {
 602                 var momentDate, isAfter, isBefore;
 603                 if ( this.mustBeAfter === undefined && this.mustBeBefore === undefined ) {
 604                         return true;
 605                 }
 606                 momentDate = moment( date, 'YYYY-MM-DD' );
 607                 isAfter = ( this.mustBeAfter === undefined || momentDate.isAfter( this.mustBeAfter ) );
 608                 isBefore = ( this.mustBeBefore === undefined || momentDate.isBefore( this.mustBeBefore ) );
 609                 return isAfter && isBefore;
 610         };
 611
 612         /**
 613          * Get the validity of current value.
 614          *
 615          * This method returns a promise that resolves if the value is valid and rejects if
 616          * it isn't. Uses {@link #validateDate}.
 617          *
 618          * @return {jQuery.Promise} A promise that resolves if the value is valid, rejects if not.
 619          */
 620         mw.widgets.DateInputWidget.prototype.getValidity = function () {
 621                 var isValid = this.validateDate( this.getValue() );
 622
 623                 if ( isValid ) {
 624                         return $.Deferred().resolve().promise();
 625                 } else {
 626                         return $.Deferred().reject().promise();
 627                 }
 628         };
 629
 630         /**
 631          * Sets the 'invalid' flag appropriately.
 632          *
 633          * @param {boolean} [isValid] Optionally override validation result
 634          */
 635         mw.widgets.DateInputWidget.prototype.setValidityFlag = function ( isValid ) {
 636                 var widget = this,
 637                         setFlag = function ( valid ) {
 638                                 if ( !valid ) {
 639                                         widget.$input.attr( 'aria-invalid', 'true' );
 640                                 } else {
 641                                         widget.$input.removeAttr( 'aria-invalid' );
 642                                 }
 643                                 widget.setFlags( { invalid: !valid } );
 644                         };
 645
 646                 if ( isValid !== undefined ) {
 647                         setFlag( isValid );
 648                 } else {
 649                         this.getValidity().then( function () {
 650                                 setFlag( true );
 651                         }, function () {
 652                                 setFlag( false );
 653                         } );
 654                 }
 655         };
 656
 657 }( jQuery, mediaWiki ) );