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.closing = false;
 134                 this.inputFormat = config.inputFormat;
 135                 this.displayFormat = config.displayFormat;
 136                 this.longDisplayFormat = config.longDisplayFormat;
 137                 this.required = config.required;
 138                 this.placeholderLabel = config.placeholderLabel;
 139                 // Validate and set min and max dates as properties
 140
 141                 if ( config.mustBeAfter !== undefined ) {
 142                         mustBeAfter = moment( config.mustBeAfter, 'YYYY-MM-DD' );
 143                         if ( mustBeAfter.isValid() ) {
 144                                 this.mustBeAfter = mustBeAfter;
 145                         }
 146                 }
 147                 if ( config.mustBeBefore !== undefined ) {
 148                         mustBeBefore = moment( config.mustBeBefore, 'YYYY-MM-DD' );
 149                         if ( mustBeBefore.isValid() ) {
 150                                 this.mustBeBefore = mustBeBefore;
 151                         }
 152                 }
 153                 // Parent constructor
 154                 mw.widgets.DateInputWidget.parent.call( this, config );
 155
 156                 // Mixin constructors
 157                 OO.ui.mixin.IndicatorElement.call( this, config );
 158
 159                 // Events
 160                 this.calendar.connect( this, {
 161                         change: 'onCalendarChange'
 162                 } );
 163                 this.textInput.connect( this, {
 164                         enter: 'onEnter',
 165                         change: 'onTextInputChange'
 166                 } );
 167                 this.$element.on( {
 168                         focusout: this.onBlur.bind( this )
 169                 } );
 170                 this.calendar.$element.on( {
 171                         click: this.onCalendarClick.bind( this ),
 172                         keypress: this.onCalendarKeyPress.bind( this )
 173                 } );
 174                 this.$handle.on( {
 175                         click: this.onClick.bind( this ),
 176                         keypress: this.onKeyPress.bind( this ),
 177                         focus: this.onFocus.bind( this )
 178                 } );
 179
 180                 // Initialization
 181                 // Move 'tabindex' from this.$input (which is invisible) to the visible handle
 182                 this.setTabIndexedElement( this.$handle );
 183                 this.$handle
 184                         .append( this.innerLabel.$element, this.$indicator )
 185                         .addClass( 'mw-widget-dateInputWidget-handle' );
 186                 this.calendar.$element
 187                         .addClass( 'mw-widget-dateInputWidget-calendar' );
 188                 this.$element
 189                         .addClass( 'mw-widget-dateInputWidget' )
 190                         .append( this.$handle, this.textInput.$element, this.calendar.$element );
 191
 192                 // config.overlay is the selector to be used for config.$overlay, specified from PHP
 193                 if ( config.overlay ) {
 194                         config.$overlay = $( config.overlay );
 195                 }
 196
 197                 if ( config.$overlay ) {
 198                         this.calendar.setFloatableContainer( this.$element );
 199                         config.$overlay.append( this.calendar.$element );
 200
 201                         // The text input and calendar are not in DOM order, so fix up focus transitions.
 202                         this.textInput.$input.on( 'keydown', function ( e ) {
 203                                 if ( e.which === OO.ui.Keys.TAB ) {
 204                                         if ( e.shiftKey ) {
 205                                                 // Tabbing backward from text input: normal browser behavior
 206                                                 $.noop();
 207                                         } else {
 208                                                 // Tabbing forward from text input: just focus the calendar
 209                                                 this.calendar.$element.focus();
 210                                                 return false;
 211                                         }
 212                                 }
 213                         }.bind( this ) );
 214                         this.calendar.$element.on( 'keydown', function ( e ) {
 215                                 if ( e.which === OO.ui.Keys.TAB ) {
 216                                         if ( e.shiftKey ) {
 217                                                 // Tabbing backward from calendar: just focus the text input
 218                                                 this.textInput.$input.focus();
 219                                                 return false;
 220                                         } else {
 221                                                 // Tabbing forward from calendar: focus the text input, then allow normal browser
 222                                                 // behavior to move focus to next focusable after it
 223                                                 this.textInput.$input.focus();
 224                                         }
 225                                 }
 226                         }.bind( this ) );
 227                 }
 228
 229                 // Set handle label and hide stuff
 230                 this.updateUI();
 231                 this.textInput.toggle( false );
 232                 this.calendar.toggle( false );
 233
 234                 // Hide unused <input> from PHP after infusion is done
 235                 // See InputWidget#reusePreInfuseDOM about config.$input
 236                 if ( config.$input ) {
 237                         config.$input.addClass( 'oo-ui-element-hidden' );
 238                 }
 239         };
 240
 241         /* Inheritance */
 242
 243         OO.inheritClass( mw.widgets.DateInputWidget, OO.ui.TextInputWidget );
 244         OO.mixinClass( mw.widgets.DateInputWidget, OO.ui.mixin.IndicatorElement );
 245
 246         /* Events */
 247
 248         /**
 249          * Fired when the widget is deactivated (i.e. the calendar is closed). This can happen because
 250          * the user selected a value, or because the user blurred the widget.
 251          *
 252          * @event deactivate
 253          * @param {boolean} userSelected Whether the deactivation happened because the user selected a value
 254          */
 255
 256         /* Methods */
 257
 258         /**
 259          * @inheritdoc
 260          * @protected
 261          */
 262         mw.widgets.DateInputWidget.prototype.getInputElement = function () {
 263                 return $( '<input>' ).attr( 'type', 'hidden' );
 264         };
 265
 266         /**
 267          * Respond to calendar date change events.
 268          *
 269          * @private
 270          */
 271         mw.widgets.DateInputWidget.prototype.onCalendarChange = function () {
 272                 this.inCalendar++;
 273                 if ( !this.inTextInput ) {
 274                         // If this is caused by user typing in the input field, do not set anything.
 275                         // The value may be invalid (see #onTextInputChange), but displayable on the calendar.
 276                         this.setValue( this.calendar.getDate() );
 277                 }
 278                 this.inCalendar--;
 279         };
 280
 281         /**
 282          * Respond to text input value change events.
 283          *
 284          * @private
 285          */
 286         mw.widgets.DateInputWidget.prototype.onTextInputChange = function () {
 287                 var mom,
 288                         widget = this,
 289                         value = this.textInput.getValue(),
 290                         valid = this.isValidDate( value );
 291                 this.inTextInput++;
 292
 293                 if ( value === '' ) {
 294                         // No date selected
 295                         widget.setValue( '' );
 296                 } else if ( valid ) {
 297                         // Well-formed date value, parse and set it
 298                         mom = moment( value, widget.getInputFormat() );
 299                         // Use English locale to avoid number formatting
 300                         widget.setValue( mom.locale( 'en' ).format( widget.getInternalFormat() ) );
 301                 } else {
 302                         // Not well-formed, but possibly partial? Try updating the calendar, but do not set the
 303                         // internal value. Generally this only makes sense when 'inputFormat' is little-endian (e.g.
 304                         // 'YYYY-MM-DD'), but that's hard to check for, and might be difficult to handle the parsing
 305                         // right for weird formats. So limit this trick to only when we're using the default
 306                         // 'inputFormat', which is the same as the internal format, 'YYYY-MM-DD'.
 307                         if ( widget.getInputFormat() === widget.getInternalFormat() ) {
 308                                 widget.calendar.setDate( widget.textInput.getValue() );
 309                         }
 310                 }
 311                 widget.inTextInput--;
 312
 313         };
 314
 315         /**
 316          * @inheritdoc
 317          */
 318         mw.widgets.DateInputWidget.prototype.setValue = function ( value ) {
 319                 var oldValue = this.value;
 320
 321                 if ( !moment( value, this.getInternalFormat() ).isValid() ) {
 322                         value = '';
 323                 }
 324
 325                 mw.widgets.DateInputWidget.parent.prototype.setValue.call( this, value );
 326
 327                 if ( this.value !== oldValue ) {
 328                         this.updateUI();
 329                         this.setValidityFlag();
 330                 }
 331
 332                 return this;
 333         };
 334
 335         /**
 336          * Handle text input and calendar blur events.
 337          *
 338          * @private
 339          */
 340         mw.widgets.DateInputWidget.prototype.onBlur = function () {
 341                 var widget = this;
 342                 setTimeout( function () {
 343                         var $focussed = $( ':focus' );
 344                         // Deactivate unless the focus moved to something else inside this widget
 345                         if (
 346                                 !OO.ui.contains( widget.$element[ 0 ], $focussed[ 0 ], true ) &&
 347                                 // Calendar might be in an $overlay
 348                                 !OO.ui.contains( widget.calendar.$element[ 0 ], $focussed[ 0 ], true )
 349                         ) {
 350                                 widget.deactivate();
 351                         }
 352                 }, 0 );
 353         };
 354
 355         /**
 356          * @inheritdoc
 357          */
 358         mw.widgets.DateInputWidget.prototype.focus = function () {
 359                 this.activate();
 360                 return this;
 361         };
 362
 363         /**
 364          * @inheritdoc
 365          */
 366         mw.widgets.DateInputWidget.prototype.blur = function () {
 367                 this.deactivate();
 368                 return this;
 369         };
 370
 371         /**
 372          * Update the contents of the label, text input and status of calendar to reflect selected value.
 373          *
 374          * @private
 375          */
 376         mw.widgets.DateInputWidget.prototype.updateUI = function () {
 377                 var moment;
 378                 if ( this.getValue() === '' ) {
 379                         this.textInput.setValue( '' );
 380                         this.calendar.setDate( null );
 381                         this.innerLabel.setLabel( this.placeholderLabel );
 382                         this.$element.addClass( 'mw-widget-dateInputWidget-empty' );
 383                 } else {
 384                         moment = this.getMoment();
 385                         if ( !this.inTextInput ) {
 386                                 this.textInput.setValue( moment.format( this.getInputFormat() ) );
 387                         }
 388                         if ( !this.inCalendar ) {
 389                                 this.calendar.setDate( this.getValue() );
 390                         }
 391                         this.innerLabel.setLabel( moment.format( this.getDisplayFormat() ) );
 392                         this.$element.removeClass( 'mw-widget-dateInputWidget-empty' );
 393                 }
 394         };
 395
 396         /**
 397          * Deactivate this input field for data entry. Closes the calendar and hides the text field.
 398          *
 399          * @private
 400          * @param {boolean} [userSelected] Whether we are deactivating because the user selected a value
 401          */
 402         mw.widgets.DateInputWidget.prototype.deactivate = function ( userSelected ) {
 403                 this.$element.removeClass( 'mw-widget-dateInputWidget-active' );
 404                 this.$handle.show();
 405                 this.textInput.toggle( false );
 406                 this.calendar.toggle( false );
 407                 this.setValidityFlag();
 408
 409                 if ( userSelected ) {
 410                         // Prevent focusing the handle from reopening the calendar
 411                         this.closing = true;
 412                         this.$handle.focus();
 413                         this.closing = false;
 414                 }
 415
 416                 this.emit( 'deactivate', !!userSelected );
 417         };
 418
 419         /**
 420          * Activate this input field for data entry. Opens the calendar and shows the text field.
 421          *
 422          * @private
 423          */
 424         mw.widgets.DateInputWidget.prototype.activate = function () {
 425                 this.calendar.resetUI();
 426                 this.$element.addClass( 'mw-widget-dateInputWidget-active' );
 427                 this.$handle.hide();
 428                 this.textInput.toggle( true );
 429                 this.calendar.toggle( true );
 430
 431                 this.textInput.$input.focus();
 432         };
 433
 434         /**
 435          * Get the date format to be used for handle label when the input is inactive.
 436          *
 437          * @private
 438          * @return {string} Format string
 439          */
 440         mw.widgets.DateInputWidget.prototype.getDisplayFormat = function () {
 441                 var localeData, llll, lll, ll, format;
 442
 443                 if ( this.displayFormat !== undefined ) {
 444                         return this.displayFormat;
 445                 }
 446
 447                 if ( this.calendar.getPrecision() === 'month' ) {
 448                         return 'MMMM YYYY';
 449                 } else {
 450                         // The formats Moment.js provides:
 451                         // * ll:   Month name, day of month, year
 452                         // * lll:  Month name, day of month, year, time
 453                         // * llll: Month name, day of month, day of week, year, time
 454                         //
 455                         // The format we want:
 456                         // * ????: Month name, day of month, day of week, year
 457                         //
 458                         // We try to construct it as 'llll - (lll - ll)' and hope for the best.
 459                         // This seems to work well for many languages (maybe even all?).
 460
 461                         localeData = moment.localeData( moment.locale() );
 462                         llll = localeData.longDateFormat( 'llll' );
 463                         lll = localeData.longDateFormat( 'lll' );
 464                         ll = localeData.longDateFormat( 'll' );
 465                         format = llll.replace( lll.replace( ll, '' ), '' );
 466
 467                         if ( this.longDisplayFormat ) {
 468                                 format = format.replace( 'MMM', 'MMMM' ).replace( 'ddd', 'dddd' );
 469                         }
 470
 471                         return format;
 472                 }
 473         };
 474
 475         /**
 476          * Get the date format to be used for the text field when the input is active.
 477          *
 478          * @private
 479          * @return {string} Format string
 480          */
 481         mw.widgets.DateInputWidget.prototype.getInputFormat = function () {
 482                 if ( this.inputFormat !== undefined ) {
 483                         return this.inputFormat;
 484                 }
 485
 486                 return {
 487                         day: 'YYYY-MM-DD',
 488                         month: 'YYYY-MM'
 489                 }[ this.calendar.getPrecision() ];
 490         };
 491
 492         /**
 493          * Get the date format to be used internally for the value. This is not configurable in any way,
 494          * and always either 'YYYY-MM-DD' or 'YYYY-MM'.
 495          *
 496          * @private
 497          * @return {string} Format string
 498          */
 499         mw.widgets.DateInputWidget.prototype.getInternalFormat = function () {
 500                 return {
 501                         day: 'YYYY-MM-DD',
 502                         month: 'YYYY-MM'
 503                 }[ this.calendar.getPrecision() ];
 504         };
 505
 506         /**
 507          * Get the Moment object for current value.
 508          *
 509          * @return {Object} Moment object
 510          */
 511         mw.widgets.DateInputWidget.prototype.getMoment = function () {
 512                 return moment( this.getValue(), this.getInternalFormat() );
 513         };
 514
 515         /**
 516          * Handle mouse click events.
 517          *
 518          * @private
 519          * @param {jQuery.Event} e Mouse click event
 520          * @return {boolean} False to cancel the default event
 521          */
 522         mw.widgets.DateInputWidget.prototype.onClick = function ( e ) {
 523                 if ( !this.isDisabled() && e.which === 1 ) {
 524                         this.activate();
 525                 }
 526                 return false;
 527         };
 528
 529         /**
 530          * Handle key press events.
 531          *
 532          * @private
 533          * @param {jQuery.Event} e Key press event
 534          * @return {boolean} False to cancel the default event
 535          */
 536         mw.widgets.DateInputWidget.prototype.onKeyPress = function ( e ) {
 537                 if ( !this.isDisabled() &&
 538                         ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
 539                 ) {
 540                         this.activate();
 541                         return false;
 542                 }
 543         };
 544
 545         /**
 546          * Handle focus events.
 547          *
 548          * @private
 549          */
 550         mw.widgets.DateInputWidget.prototype.onFocus = function () {
 551                 if ( !this.closing ) {
 552                         this.activate();
 553                 }
 554         };
 555
 556         /**
 557          * Handle calendar key press events.
 558          *
 559          * @private
 560          * @param {jQuery.Event} e Key press event
 561          * @return {boolean} False to cancel the default event
 562          */
 563         mw.widgets.DateInputWidget.prototype.onCalendarKeyPress = function ( e ) {
 564                 if ( !this.isDisabled() && e.which === OO.ui.Keys.ENTER ) {
 565                         this.deactivate( true );
 566                         return false;
 567                 }
 568         };
 569
 570         /**
 571          * Handle calendar click events.
 572          *
 573          * @private
 574          * @param {jQuery.Event} e Mouse click event
 575          * @return {boolean} False to cancel the default event
 576          */
 577         mw.widgets.DateInputWidget.prototype.onCalendarClick = function ( e ) {
 578                 var targetClass = this.calendar.getPrecision() === 'month' ?
 579                         'mw-widget-calendarWidget-month' :
 580                         'mw-widget-calendarWidget-day';
 581                 if (
 582                         !this.isDisabled() &&
 583                         e.which === 1 &&
 584                         $( e.target ).hasClass( targetClass )
 585                 ) {
 586                         this.deactivate( true );
 587                         return false;
 588                 }
 589         };
 590
 591         /**
 592          * Handle text input enter events.
 593          *
 594          * @private
 595          */
 596         mw.widgets.DateInputWidget.prototype.onEnter = function () {
 597                 this.deactivate( true );
 598         };
 599
 600         /**
 601          * @private
 602          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format or
 603          *     (unless the field is required) empty
 604          * @return {boolean}
 605          */
 606         mw.widgets.DateInputWidget.prototype.validateDate = function ( date ) {
 607                 var isValid;
 608                 if ( date === '' ) {
 609                         isValid = !this.required;
 610                 } else {
 611                         isValid = this.isValidDate( date ) && this.isInRange( date );
 612                 }
 613                 return isValid;
 614         };
 615
 616         /**
 617          * @private
 618          * @param {string} date Date string, to be valid, must be in 'YYYY-MM-DD' or 'YYYY-MM' format
 619          * @return {boolean}
 620          */
 621         mw.widgets.DateInputWidget.prototype.isValidDate = function ( date ) {
 622                 // "Half-strict mode": for example, for the format 'YYYY-MM-DD', 2015-1-3 instead of 2015-01-03
 623                 // is okay, but 2015-01 isn't, and neither is 2015-01-foo. Use Moment's "fuzzy" mode and check
 624                 // parsing flags for the details (stolen from implementation of moment#isValid).
 625                 var
 626                         mom = moment( date, this.getInputFormat() ),
 627                         flags = mom.parsingFlags();
 628
 629                 return mom.isValid() && flags.charsLeftOver === 0 && flags.unusedTokens.length === 0;
 630         };
 631
 632         /**
 633          * Validates if the date is within the range configured with {@link #cfg-mustBeAfter}
 634          * and {@link #cfg-mustBeBefore}.
 635          *
 636          * @private
 637          * @param {string} date Date string, to be valid, must be empty (no date selected) or in
 638          *     'YYYY-MM-DD' or 'YYYY-MM' format to be valid
 639          * @return {boolean}
 640          */
 641         mw.widgets.DateInputWidget.prototype.isInRange = function ( date ) {
 642                 var momentDate, isAfter, isBefore;
 643                 if ( this.mustBeAfter === undefined && this.mustBeBefore === undefined ) {
 644                         return true;
 645                 }
 646                 momentDate = moment( date, 'YYYY-MM-DD' );
 647                 isAfter = ( this.mustBeAfter === undefined || momentDate.isAfter( this.mustBeAfter ) );
 648                 isBefore = ( this.mustBeBefore === undefined || momentDate.isBefore( this.mustBeBefore ) );
 649                 return isAfter && isBefore;
 650         };
 651
 652         /**
 653          * Get the validity of current value.
 654          *
 655          * This method returns a promise that resolves if the value is valid and rejects if
 656          * it isn't. Uses {@link #validateDate}.
 657          *
 658          * @return {jQuery.Promise} A promise that resolves if the value is valid, rejects if not.
 659          */
 660         mw.widgets.DateInputWidget.prototype.getValidity = function () {
 661                 var isValid = this.validateDate( this.getValue() );
 662
 663                 if ( isValid ) {
 664                         return $.Deferred().resolve().promise();
 665                 } else {
 666                         return $.Deferred().reject().promise();
 667                 }
 668         };
 669
 670         /**
 671          * Sets the 'invalid' flag appropriately.
 672          *
 673          * @param {boolean} [isValid] Optionally override validation result
 674          */
 675         mw.widgets.DateInputWidget.prototype.setValidityFlag = function ( isValid ) {
 676                 var widget = this,
 677                         setFlag = function ( valid ) {
 678                                 if ( !valid ) {
 679                                         widget.$input.attr( 'aria-invalid', 'true' );
 680                                 } else {
 681                                         widget.$input.removeAttr( 'aria-invalid' );
 682                                 }
 683                                 widget.setFlags( { invalid: !valid } );
 684                         };
 685
 686                 if ( isValid !== undefined ) {
 687                         setFlag( isValid );
 688                 } else {
 689                         this.getValidity().then( function () {
 690                                 setFlag( true );
 691                         }, function () {
 692                                 setFlag( false );
 693                         } );
 694                 }
 695         };
 696
 697 }( jQuery, mediaWiki ) );