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.TextInputWidget
  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 {boolean} [longDisplayFormat=false] If a custom displayFormat is not specified, use
  76          *     unabbreviated day of the week and month names in the default language-specific displayFormat.
  77          * @cfg {string} [placeholderLabel=No date selected] Placeholder text shown when the widget is not
  78          *     selected. Default text taken from message `mw-widgets-dateinput-no-date`.
  79          * @cfg {string} [placeholderDateFormat] User-visible date format string displayed in the textual input
  80          *     field when it's empty. Should be the same as `inputFormat`, but translated to the user's
  81          *     language. When not given, defaults to a translated version of 'YYYY-MM-DD' or 'YYYY-MM',
  82          *     depending on `precision`.
  83          * @cfg {boolean} [required=false] Mark the field as required. Implies `indicator: 'required'`.
  84          * @cfg {string} [mustBeAfter] Validates the date to be after this. In the 'YYYY-MM-DD' format.
  85          * @cfg {string} [mustBeBefore] Validates the date to be before this. In the 'YYYY-MM-DD' format.
  86          * @cfg {jQuery} [$overlay] Render the calendar into a separate layer. This configuration is
  87          *     useful in cases where the expanded calendar is larger than its container. The specified
  88          *     overlay layer is usually on top of the container and has a larger area. By default, the
  89          *     calendar uses relative positioning.
  90          */
  91         mw.widgets.DateInputWidget = function MWWDateInputWidget( config ) {
  92                 var placeholderDateFormat, mustBeAfter, mustBeBefore;
  93
  94                 // Config initialization
  95                 config = $.extend( {
  96                         precision: 'day',
  97                         longDisplayFormat: false,
  98                         required: false,
  99                         placeholderLabel: mw.msg( 'mw-widgets-dateinput-no-date' )
 100                 }, config );
 101                 if ( config.required ) {
 102                         if ( config.indicator === undefined ) {
 103                                 config.indicator = 'required';
 104                         }
 105                 }
 106
 107                 if ( config.placeholderDateFormat ) {
 108                         placeholderDateFormat = config.placeholderDateFormat;
 109                 } else if ( config.inputFormat ) {
 110                         // We have no way to display a translated placeholder for custom formats
 111                         placeholderDateFormat = '';
 112                 } else {
 113                         // Messages: mw-widgets-dateinput-placeholder-day, mw-widgets-dateinput-placeholder-month
 114                         placeholderDateFormat = mw.msg( 'mw-widgets-dateinput-placeholder-' + config.precision );
 115                 }
 116
 117                 // Properties (must be set before parent constructor, which calls #setValue)
 118                 this.$handle = $( '<div>' );
 119                 this.innerLabel = new OO.ui.LabelWidget();
 120                 this.textInput = new OO.ui.TextInputWidget( {
 121                         required: config.required,
 122                         placeholder: placeholderDateFormat,
 123                         validate: this.validateDate.bind( this )
 124                 } );
 125                 this.calendar = new mw.widgets.CalendarWidget( {
 126                         lazyInitOnToggle: true,
 127                         // Can't pass `$floatableContainer: this.$element` here, the latter is not set yet.
 128                         // Instead we call setFloatableContainer() below.
 129                         precision: config.precision
 130                 } );
 131                 this.inCalendar = 0;
 132                 this.inTextInput = 0;
 133                 this.inputFormat = config.inputFormat;
 134                 this.displayFormat = config.displayFormat;
 135                 this.longDisplayFormat = config.longDisplayFormat;
 136                 this.required = config.required;
 137                 this.placeholderLabel = config.placeholderLabel;
 138                 // Validate and set min and max dates as properties
 139
 140                 if ( config.mustBeAfter !== undefined ) {
 141                         mustBeAfter = moment( config.mustBeAfter, 'YYYY-MM-DD' );
 142                         if ( mustBeAfter.isValid() ) {
 143                                 this.mustBeAfter = mustBeAfter;
 144                         }
 145                 }
 146                 if ( config.mustBeBefore !== undefined ) {
 147                         mustBeBefore = moment( config.mustBeBefore, 'YYYY-MM-DD' );
 148                         if ( mustBeBefore.isValid() ) {
 149                                 this.mustBeBefore = mustBeBefore;
 150                         }
 151                 }
 152                 // Parent constructor
 153                 mw.widgets.DateInputWidget.parent.call( this, config );
 154
 155                 // Mixin constructors
 156                 OO.ui.mixin.IndicatorElement.call( this, config );
 157
 158                 // Events
 159                 this.calendar.connect( this, {
 160                         change: 'onCalendarChange'
 161                 } );
 162                 this.textInput.connect( this, {
 163                         enter: 'onEnter',
 164                         change: 'onTextInputChange'
 165                 } );
 166                 this.$element.on( {
 167                         focusout: this.onBlur.bind( this )
 168                 } );
 169                 this.calendar.$element.on( {
 170                         click: this.onCalendarClick.bind( this ),
 171                         keypress: this.onCalendarKeyPress.bind( this )
 172                 } );
 173                 this.$handle.on( {
 174                         click: this.onClick.bind( this ),
 175                         keypress: this.onKeyPress.bind( this ),
 176                         focus: this.activate.bind( this )
 177                 } );
 178
 179                 // Initialization
 180                 // Move 'tabindex' from this.$input (which is invisible) to the visible handle
 181                 this.setTabIndexedElement( this.$handle );
 182                 this.$handle
 183                         .append( this.innerLabel.$element, this.$indicator )
 184                         .addClass( 'mw-widget-dateInputWidget-handle' );
 185                 this.calendar.$element
 186                         .addClass( 'mw-widget-dateInputWidget-calendar' );
 187                 this.$element
 188                         .addClass( 'mw-widget-dateInputWidget' )
 189                         .append( this.$handle, this.textInput.$element, this.calendar.$element );
 190
 191                 // config.overlay is the selector to be used for config.$overlay, specified from PHP
 192                 if ( config.overlay ) {
 193                         config.$overlay = $( config.overlay );
 194                 }
 195
 196                 if ( config.$overlay ) {
 197                         this.calendar.setFloatableContainer( this.$element );
 198                         config.$overlay.append( this.calendar.$element );
 199
 200                         // The text input and calendar are not in DOM order, so fix up focus transitions.
 201                         this.textInput.$input.on( 'keydown', function ( e ) {
 202                                 if ( e.which === OO.ui.Keys.TAB ) {
 203                                         if ( e.shiftKey ) {
 204                                                 // Tabbing backward from text input: normal browser behavior
 205                                                 $.noop();
 206                                         } else {
 207                                                 // Tabbing forward from text input: just focus the calendar
 208                                                 this.calendar.$element.focus();
 209                                                 return false;
 210                                         }
 211                                 }
 212                         }.bind( this ) );
 213                         this.calendar.$element.on( 'keydown', function ( e ) {
 214                                 if ( e.which === OO.ui.Keys.TAB ) {
 215                                         if ( e.shiftKey ) {
 216                                                 // Tabbing backward from calendar: just focus the text input
 217                                                 this.textInput.$input.focus();
 218                                                 return false;
 219                                         } else {
 220                                                 // Tabbing forward from calendar: focus the text input, then allow normal browser
 221                                                 // behavior to move focus to next focusable after it
 222                                                 this.textInput.$input.focus();
 223                                         }
 224                                 }
 225                         }.bind( this ) );
 226                 }
 227
 228                 // Set handle label and hide stuff
 229                 this.updateUI();
 230                 this.textInput.toggle( false );
 231                 this.calendar.toggle( false );
 232
 233                 // Hide unused <input> from PHP after infusion is done
 234                 // See InputWidget#reusePreInfuseDOM about config.$input
 235                 if ( config.$input ) {
 236                         config.$input.addClass( 'oo-ui-element-hidden' );
 237                 }
 238         };
 239
 240         /* Inheritance */
 241
 242         OO.inheritClass( mw.widgets.DateInputWidget, OO.ui.TextInputWidget );
 243         OO.mixinClass( mw.widgets.DateInputWidget, OO.ui.mixin.IndicatorElement );
 244
 245         /* Methods */
 246
 247         /**
 248          * @inheritdoc
 249          * @protected
 250          */
 251         mw.widgets.DateInputWidget.prototype.getInputElement = function () {
 252                 return $( '<input>' ).attr( 'type', 'hidden' );
 253         };
 254
 255         /**
 256          * Respond to calendar date change events.
 257          *
 258          * @private
 259          */
 260         mw.widgets.DateInputWidget.prototype.onCalendarChange = function () {
 261                 this.inCalendar++;
 262                 if ( !this.inTextInput ) {
 263                         // If this is caused by user typing in the input field, do not set anything.
 264                         // The value may be invalid (see #onTextInputChange), but displayable on the calendar.
 265                         this.setValue( this.calendar.getDate() );
 266                 }
 267                 this.inCalendar--;
 268         };
 269
 270         /**
 271          * Respond to text input value change events.
 272          *
 273          * @private
 274          */
 275         mw.widgets.DateInputWidget.prototype.onTextInputChange = function () {
 276                 var mom,
 277                         widget = this,
 278                         value = this.textInput.getValue(),
 279                         valid = this.isValidDate( value );
 280                 this.inTextInput++;
 281
 282                 if ( value === '' ) {
 283                         // No date selected
 284                         widget.setValue( '' );
 285                 } else if ( valid ) {
 286                         // Well-formed date value, parse and set it
 287                         mom = moment( value, widget.getInputFormat() );
 288                         // Use English locale to avoid number formatting
 289                         widget.setValue( mom.locale( 'en' ).format( widget.getInternalFormat() ) );
 290                 } else {
 291                         // Not well-formed, but possibly partial? Try updating the calendar, but do not set the
 292                         // internal value. Generally this only makes sense when 'inputFormat' is little-endian (e.g.
 293                         // 'YYYY-MM-DD'), but that's hard to check for, and might be difficult to handle the parsing
 294                         // right for weird formats. So limit this trick to only when we're using the default
 295                         // 'inputFormat', which is the same as the internal format, 'YYYY-MM-DD'.
 296                         if ( widget.getInputFormat() === widget.getInternalFormat() ) {
 297                                 widget.calendar.setDate( widget.textInput.getValue() );
 298                         }
 299                 }
 300                 widget.inTextInput--;
 301
 302         };
 303
 304         /**
 305          * @inheritdoc
 306          */
 307         mw.widgets.DateInputWidget.prototype.setValue = function ( value ) {
 308                 var oldValue = this.value;
 309
 310                 if ( !moment( value, this.getInternalFormat() ).isValid() ) {
 311                         value = '';
 312                 }
 313
 314                 mw.widgets.DateInputWidget.parent.prototype.setValue.call( this, value );
 315
 316                 if ( this.value !== oldValue ) {
 317                         this.updateUI();
 318                         this.setValidityFlag();
 319                 }
 320
 321                 return this;
 322         };
 323
 324         /**
 325          * Handle text input and calendar blur events.
 326          *
 327          * @private
 328          */
 329         mw.widgets.DateInputWidget.prototype.onBlur = function () {
 330                 var widget = this;
 331                 setTimeout( function () {
 332                         var $focussed = $( ':focus' );
 333                         // Deactivate unless the focus moved to something else inside this widget
 334                         if (
 335                                 !OO.ui.contains( widget.$element[ 0 ], $focussed[ 0 ], true ) &&
 336                                 // Calendar might be in an $overlay
 337                                 !OO.ui.contains( widget.calendar.$element[ 0 ], $focussed[ 0 ], true )
 338                         ) {
 339                                 widget.deactivate();
 340                         }
 341                 }, 0 );
 342         };
 343
 344         /**
 345          * @inheritdoc
 346          */
 347         mw.widgets.DateInputWidget.prototype.focus = function () {
 348                 this.activate();
 349                 return this;
 350         };
 351
 352         /**
 353          * @inheritdoc
 354          */
 355         mw.widgets.DateInputWidget.prototype.blur = function () {
 356                 this.deactivate();
 357                 return this;
 358         };
 359
 360         /**
 361          * Update the contents of the label, text input and status of calendar to reflect selected value.
 362          *
 363          * @private
 364          */
 365         mw.widgets.DateInputWidget.prototype.updateUI = function () {
 366                 var moment;
 367                 if ( this.getValue() === '' ) {
 368                         this.textInput.setValue( '' );
 369                         this.calendar.setDate( null );
 370                         this.innerLabel.setLabel( this.placeholderLabel );
 371                         this.$element.addClass( 'mw-widget-dateInputWidget-empty' );
 372                 } else {
 373                         moment = this.getMoment();
 374                         if ( !this.inTextInput ) {
 375                                 this.textInput.setValue( moment.format( this.getInputFormat() ) );
 376                         }
 377                         if ( !this.inCalendar ) {
 378                                 this.calendar.setDate( this.getValue() );
 379                         }
 380                         this.innerLabel.setLabel( moment.format( this.getDisplayFormat() ) );
 381                         this.$element.removeClass( 'mw-widget-dateInputWidget-empty' );
 382                 }
 383         };
 384
 385         /**
 386          * Deactivate this input field for data entry. Closes the calendar and hides the text field.
 387          *
 388          * @private
 389          */
 390         mw.widgets.DateInputWidget.prototype.deactivate = function () {
 391                 this.$element.removeClass( 'mw-widget-dateInputWidget-active' );
 392                 this.$handle.show();
 393                 this.textInput.toggle( false );
 394                 this.calendar.toggle( false );
 395                 this.setValidityFlag();
 396         };
 397
 398         /**
 399          * Activate this input field for data entry. Opens the calendar and shows the text field.
 400          *
 401          * @private
 402          */
 403         mw.widgets.DateInputWidget.prototype.activate = function () {
 404                 this.calendar.resetUI();
 405                 this.$element.addClass( 'mw-widget-dateInputWidget-active' );
 406                 this.$handle.hide();
 407                 this.textInput.toggle( true );
 408                 this.calendar.toggle( true );
 409
 410                 this.textInput.$input.focus();
 411         };
 412
 413         /**
 414          * Get the date format to be used for handle label when the input is inactive.
 415          *
 416          * @private
 417          * @return {string} Format string
 418          */
 419         mw.widgets.DateInputWidget.prototype.getDisplayFormat = function () {
 420                 var localeData, llll, lll, ll, format;
 421
 422                 if ( this.displayFormat !== undefined ) {
 423                         return this.displayFormat;
 424                 }
 425
 426                 if ( this.calendar.getPrecision() === 'month' ) {
 427                         return 'MMMM YYYY';
 428                 } else {
 429                         // The formats Moment.js provides:
 430                         // * ll:   Month name, day of month, year
 431                         // * lll:  Month name, day of month, year, time
 432                         // * llll: Month name, day of month, day of week, year, time
 433                         //
 434                         // The format we want:
 435                         // * ????: Month name, day of month, day of week, year
 436                         //
 437                         // We try to construct it as 'llll - (lll - ll)' and hope for the best.
 438                         // This seems to work well for many languages (maybe even all?).
 439
 440                         localeData = moment.localeData( moment.locale() );
 441                         llll = localeData.longDateFormat( 'llll' );
 442                         lll = localeData.longDateFormat( 'lll' );
 443                         ll = localeData.longDateFormat( 'll' );
 444                         format = llll.replace( lll.replace( ll, '' ), '' );
 445
 446                         if ( this.longDisplayFormat ) {
 447                                 format = format.replace( 'MMM', 'MMMM' ).replace( 'ddd', 'dddd' );
 448                         }
 449
 450                         return format;
 451                 }
 452         };
 453
 454         /**
 455          * Get the date format to be used for the text field when the input is active.
 456          *
 457          * @private
 458          * @return {string} Format string
 459          */
 460         mw.widgets.DateInputWidget.prototype.getInputFormat = function () {
 461                 if ( this.inputFormat !== undefined ) {
 462                         return this.inputFormat;
 463                 }
 464
 465                 return {
 466                         day: 'YYYY-MM-DD',
 467                         month: 'YYYY-MM'
 468                 }[ this.calendar.getPrecision() ];
 469         };
 470
 471         /**
 472          * Get the date format to be used internally for the value. This is not configurable in any way,
 473          * and always either 'YYYY-MM-DD' or 'YYYY-MM'.
 474          *
 475          * @private
 476          * @return {string} Format string
 477          */
 478         mw.widgets.DateInputWidget.prototype.getInternalFormat = function () {
 479                 return {
 480                         day: 'YYYY-MM-DD',
 481                         month: 'YYYY-MM'
 482                 }[ this.calendar.getPrecision() ];
 483         };
 484
 485         /**
 486          * Get the Moment object for current value.
 487          *
 488          * @return {Object} Moment object
 489          */
 490         mw.widgets.DateInputWidget.prototype.getMoment = function () {
 491                 return moment( this.getValue(), this.getInternalFormat() );
 492         };
 493
 494         /**
 495          * Handle mouse click events.
 496          *
 497          * @private
 498          * @param {jQuery.Event} e Mouse click event
 499          * @return {boolean} False to cancel the default event
 500          */
 501         mw.widgets.DateInputWidget.prototype.onClick = function ( e ) {
 502                 if ( !this.isDisabled() && e.which === 1 ) {
 503                         this.activate();
 504                 }
 505                 return false;
 506         };
 507
 508         /**
 509          * Handle key press events.
 510          *
 511          * @private
 512          * @param {jQuery.Event} e Key press event
 513          * @return {boolean} False to cancel the default event
 514          */
 515         mw.widgets.DateInputWidget.prototype.onKeyPress = function ( e ) {
 516                 if ( !this.isDisabled() &&
 517                         ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
 518                 ) {
 519                         this.activate();
 520                         return false;
 521                 }
 522         };
 523
 524         /**
 525          * Handle calendar key press events.
 526          *
 527          * @private
 528          * @param {jQuery.Event} e Key press event
 529          * @return {boolean} False to cancel the default event
 530          */
 531         mw.widgets.DateInputWidget.prototype.onCalendarKeyPress = function ( e ) {
 532                 if ( !this.isDisabled() && e.which === OO.ui.Keys.ENTER ) {
 533                         this.deactivate();
 534                         this.$handle.focus();
 535                         return false;
 536                 }
 537         };
 538
 539         /**
 540          * Handle calendar click events.
 541          *
 542          * @private
 543          * @param {jQuery.Event} e Mouse click event
 544          * @return {boolean} False to cancel the default event
 545          */
 546         mw.widgets.DateInputWidget.prototype.onCalendarClick = function ( e ) {
 547                 if (
 548                         !this.isDisabled() &&
 549                         e.which === 1 &&
 550                         $( e.target ).hasClass( 'mw-widget-calendarWidget-day' )
 551                 ) {
 552                         this.deactivate();
 553                         this.$handle.focus();
 554                         return false;
 555                 }
 556         };
 557
 558         /**
 559          * Handle text input enter events.
 560          *
 561          * @private
 562          */
 563         mw.widgets.DateInputWidget.prototype.onEnter = function () {
 564                 this.deactivate();
 565                 this.$handle.focus();
 566         };
 567
 568         /**
 569          * @private
 570          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format or
 571          *     (unless the field is required) empty
 572          * @return {boolean}
 573          */
 574         mw.widgets.DateInputWidget.prototype.validateDate = function ( date ) {
 575                 var isValid;
 576                 if ( date === '' ) {
 577                         isValid = !this.required;
 578                 } else {
 579                         isValid = this.isValidDate( date ) && this.isInRange( date );
 580                 }
 581                 return isValid;
 582         };
 583
 584         /**
 585          * @private
 586          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format
 587          * @return {boolean}
 588          */
 589         mw.widgets.DateInputWidget.prototype.isValidDate = function ( date ) {
 590                 // "Half-strict mode": for example, for the format 'YYYY-MM-DD', 2015-1-3 instead of 2015-01-03
 591                 // is okay, but 2015-01 isn't, and neither is 2015-01-foo. Use Moment's "fuzzy" mode and check
 592                 // parsing flags for the details (stolen from implementation of moment#isValid).
 593                 var
 594                         mom = moment( date, this.getInputFormat() ),
 595                         flags = mom.parsingFlags();
 596
 597                 return mom.isValid() && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0;
 598         };
 599
 600         /**
 601          * Validates if the date is within the range configured with {@link #cfg-mustBeAfter}
 602          * and {@link #cfg-mustBeBefore}.
 603          *
 604          * @private
 605          * @param {string} date Date string, to be valid, must be empty (no date selected) or in
 606          *     'YYYY-MM-DD' or 'YYYY-MM' format to be valid
 607          * @return {boolean}
 608          */
 609         mw.widgets.DateInputWidget.prototype.isInRange = function ( date ) {
 610                 var momentDate, isAfter, isBefore;
 611                 if ( this.mustBeAfter === undefined && this.mustBeBefore === undefined ) {
 612                         return true;
 613                 }
 614                 momentDate = moment( date, 'YYYY-MM-DD' );
 615                 isAfter = ( this.mustBeAfter === undefined || momentDate.isAfter( this.mustBeAfter ) );
 616                 isBefore = ( this.mustBeBefore === undefined || momentDate.isBefore( this.mustBeBefore ) );
 617                 return isAfter && isBefore;
 618         };
 619
 620         /**
 621          * Get the validity of current value.
 622          *
 623          * This method returns a promise that resolves if the value is valid and rejects if
 624          * it isn't. Uses {@link #validateDate}.
 625          *
 626          * @return {jQuery.Promise} A promise that resolves if the value is valid, rejects if not.
 627          */
 628         mw.widgets.DateInputWidget.prototype.getValidity = function () {
 629                 var isValid = this.validateDate( this.getValue() );
 630
 631                 if ( isValid ) {
 632                         return $.Deferred().resolve().promise();
 633                 } else {
 634                         return $.Deferred().reject().promise();
 635                 }
 636         };
 637
 638         /**
 639          * Sets the 'invalid' flag appropriately.
 640          *
 641          * @param {boolean} [isValid] Optionally override validation result
 642          */
 643         mw.widgets.DateInputWidget.prototype.setValidityFlag = function ( isValid ) {
 644                 var widget = this,
 645                         setFlag = function ( valid ) {
 646                                 if ( !valid ) {
 647                                         widget.$input.attr( 'aria-invalid', 'true' );
 648                                 } else {
 649                                         widget.$input.removeAttr( 'aria-invalid' );
 650                                 }
 651                                 widget.setFlags( { invalid: !valid } );
 652                         };
 653
 654                 if ( isValid !== undefined ) {
 655                         setFlag( isValid );
 656                 } else {
 657                         this.getValidity().then( function () {
 658                                 setFlag( true );
 659                         }, function () {
 660                                 setFlag( false );
 661                         } );
 662                 }
 663         };
 664
 665 }( jQuery, mediaWiki ) );