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

   1 /*!
   2  * MediaWiki Widgets - CategorySelector 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 ( function ( $, mw ) {
   8         var CSP,
   9                 NS_CATEGORY = mw.config.get( 'wgNamespaceIds' ).category;
  10
  11         /**
  12          * Category selector widget. Displays an OO.ui.CapsuleMultiselectWidget
  13          * and autocompletes with available categories.
  14          *
  15          *     mw.loader.using( 'mediawiki.widgets.CategorySelector', function () {
  16          *       var selector = new mw.widgets.CategorySelector( {
  17          *         searchTypes: [
  18          *           mw.widgets.CategorySelector.SearchType.OpenSearch,
  19          *           mw.widgets.CategorySelector.SearchType.InternalSearch
  20          *         ]
  21          *       } );
  22          *
  23          *       $( 'body' ).append( selector.$element );
  24          *
  25          *       selector.setSearchTypes( [ mw.widgets.CategorySelector.SearchType.SubCategories ] );
  26          *     } );
  27          *
  28          * @class mw.widgets.CategorySelector
  29          * @uses mw.Api
  30          * @extends OO.ui.CapsuleMultiselectWidget
  31          * @mixins OO.ui.mixin.PendingElement
  32          *
  33          * @constructor
  34          * @param {Object} [config] Configuration options
  35          * @cfg {mw.Api} [api] Instance of mw.Api (or subclass thereof) to use for queries
  36          * @cfg {number} [limit=10] Maximum number of results to load
  37          * @cfg {mw.widgets.CategorySelector.SearchType[]} [searchTypes=[mw.widgets.CategorySelector.SearchType.OpenSearch]]
  38          *   Default search API to use when searching.
  39          */
  40         function CategorySelector( config ) {
  41                 // Config initialization
  42                 config = $.extend( {
  43                         limit: 10,
  44                         searchTypes: [ CategorySelector.SearchType.OpenSearch ]
  45                 }, config );
  46                 this.limit = config.limit;
  47                 this.searchTypes = config.searchTypes;
  48                 this.validateSearchTypes();
  49
  50                 // Parent constructor
  51                 mw.widgets.CategorySelector.parent.call( this, $.extend( true, {}, config, {
  52                         menu: {
  53                                 filterFromInput: false
  54                         },
  55                         placeholder: mw.msg( 'mw-widgets-categoryselector-add-category-placeholder' ),
  56                         // This allows the user to both select non-existent categories, and prevents the selector from
  57                         // being wiped from #onMenuItemsChange when we change the available options in the dropdown
  58                         allowArbitrary: true
  59                 } ) );
  60
  61                 // Mixin constructors
  62                 OO.ui.mixin.PendingElement.call( this, $.extend( {}, config, { $pending: this.$handle } ) );
  63
  64                 // Event handler to call the autocomplete methods
  65                 this.$input.on( 'change input cut paste', OO.ui.debounce( this.updateMenuItems.bind( this ), 100 ) );
  66
  67                 // Initialize
  68                 this.api = config.api || new mw.Api();
  69                 this.searchCache = {};
  70         }
  71
  72         /* Setup */
  73
  74         OO.inheritClass( CategorySelector, OO.ui.CapsuleMultiselectWidget );
  75         OO.mixinClass( CategorySelector, OO.ui.mixin.PendingElement );
  76         CSP = CategorySelector.prototype;
  77
  78         /* Methods */
  79
  80         /**
  81          * Gets new items based on the input by calling
  82          * {@link #getNewMenuItems getNewItems} and updates the menu
  83          * after removing duplicates based on the data value.
  84          *
  85          * @private
  86          * @method
  87          */
  88         CSP.updateMenuItems = function () {
  89                 this.getMenu().clearItems();
  90                 this.getNewMenuItems( this.$input.val() ).then( function ( items ) {
  91                         var existingItems, filteredItems,
  92                                 menu = this.getMenu();
  93
  94                         // Never show the menu if the input lost focus in the meantime
  95                         if ( !this.$input.is( ':focus' ) ) {
  96                                 return;
  97                         }
  98
  99                         // Array of strings of the data of OO.ui.MenuOptionsWidgets
 100                         existingItems = menu.getItems().map( function ( item ) {
 101                                 return item.data;
 102                         } );
 103
 104                         // Remove if items' data already exists
 105                         filteredItems = items.filter( function ( item ) {
 106                                 return existingItems.indexOf( item ) === -1;
 107                         } );
 108
 109                         // Map to an array of OO.ui.MenuOptionWidgets
 110                         filteredItems = filteredItems.map( function ( item ) {
 111                                 return new OO.ui.MenuOptionWidget( {
 112                                         data: item,
 113                                         label: item
 114                                 } );
 115                         } );
 116
 117                         menu.addItems( filteredItems ).toggle( true );
 118                 }.bind( this ) );
 119         };
 120
 121         /**
 122          * @inheritdoc
 123          */
 124         CSP.clearInput = function () {
 125                 CategorySelector.parent.prototype.clearInput.call( this );
 126                 // Abort all pending requests, we won't need their results
 127                 this.api.abort();
 128         };
 129
 130         /**
 131          * Searches for categories based on the input.
 132          *
 133          * @private
 134          * @method
 135          * @param {string} input The input used to prefix search categories
 136          * @return {jQuery.Promise} Resolves with an array of categories
 137          */
 138         CSP.getNewMenuItems = function ( input ) {
 139                 var i,
 140                         promises = [],
 141                         deferred = $.Deferred();
 142
 143                 if ( $.trim( input ) === '' ) {
 144                         deferred.resolve( [] );
 145                         return deferred.promise();
 146                 }
 147
 148                 // Abort all pending requests, we won't need their results
 149                 this.api.abort();
 150                 for ( i = 0; i < this.searchTypes.length; i++ ) {
 151                         promises.push( this.searchCategories( input, this.searchTypes[ i ] ) );
 152                 }
 153
 154                 this.pushPending();
 155
 156                 $.when.apply( $, promises ).done( function () {
 157                         var categoryNames,
 158                                 allData = [],
 159                                 dataSets = Array.prototype.slice.apply( arguments );
 160
 161                         // Collect values from all results
 162                         allData = allData.concat.apply( allData, dataSets );
 163
 164                         categoryNames = allData
 165                                 // Remove duplicates
 166                                 .filter( function ( value, index, self ) {
 167                                         return self.indexOf( value ) === index;
 168                                 } )
 169                                 // Get Title objects
 170                                 .map( function ( name ) {
 171                                         return mw.Title.newFromText( name );
 172                                 } )
 173                                 // Keep only titles from 'Category' namespace
 174                                 .filter( function ( title ) {
 175                                         return title && title.getNamespaceId() === NS_CATEGORY;
 176                                 } )
 177                                 // Convert back to strings, strip 'Category:' prefix
 178                                 .map( function ( title ) {
 179                                         return title.getMainText();
 180                                 } );
 181
 182                         deferred.resolve( categoryNames );
 183
 184                 } ).always( this.popPending.bind( this ) );
 185
 186                 return deferred.promise();
 187         };
 188
 189         /**
 190          * @inheritdoc
 191          */
 192         CSP.createItemWidget = function ( data ) {
 193                 var title = mw.Title.makeTitle( NS_CATEGORY, data );
 194                 if ( !title ) {
 195                         return null;
 196                 }
 197                 return new mw.widgets.CategoryCapsuleItemWidget( {
 198                         apiUrl: this.api.apiUrl || undefined,
 199                         title: title
 200                 } );
 201         };
 202
 203         /**
 204          * @inheritdoc
 205          */
 206         CSP.getItemFromData = function ( data ) {
 207                 // This is a bit of a hack... We have to canonicalize the data in the same way that
 208                 // #createItemWidget and CategoryCapsuleItemWidget will do, otherwise we won't find duplicates.
 209                 var title = mw.Title.makeTitle( NS_CATEGORY, data );
 210                 if ( !title ) {
 211                         return null;
 212                 }
 213                 return OO.ui.mixin.GroupElement.prototype.getItemFromData.call( this, title.getMainText() );
 214         };
 215
 216         /**
 217          * Validates the values in `this.searchType`.
 218          *
 219          * @private
 220          * @return {boolean}
 221          */
 222         CSP.validateSearchTypes = function () {
 223                 var validSearchTypes = false,
 224                         searchTypeEnumCount = Object.keys( CategorySelector.SearchType ).length;
 225
 226                 // Check if all values are in the SearchType enum
 227                 validSearchTypes = this.searchTypes.every( function ( searchType ) {
 228                         return searchType > -1 && searchType < searchTypeEnumCount;
 229                 } );
 230
 231                 if ( validSearchTypes === false ) {
 232                         throw new Error( 'Unknown searchType in searchTypes' );
 233                 }
 234
 235                 // If the searchTypes has CategorySelector.SearchType.SubCategories
 236                 // it can be the only search type.
 237                 if ( this.searchTypes.indexOf( CategorySelector.SearchType.SubCategories ) > -1 &&
 238                         this.searchTypes.length > 1
 239                 ) {
 240                         throw new Error( 'Can\'t have additional search types with CategorySelector.SearchType.SubCategories' );
 241                 }
 242
 243                 // If the searchTypes has CategorySelector.SearchType.ParentCategories
 244                 // it can be the only search type.
 245                 if ( this.searchTypes.indexOf( CategorySelector.SearchType.ParentCategories ) > -1 &&
 246                         this.searchTypes.length > 1
 247                 ) {
 248                         throw new Error( 'Can\'t have additional search types with CategorySelector.SearchType.ParentCategories' );
 249                 }
 250
 251                 return true;
 252         };
 253
 254         /**
 255          * Sets and validates the value of `this.searchType`.
 256          *
 257          * @param {mw.widgets.CategorySelector.SearchType[]} searchTypes
 258          */
 259         CSP.setSearchTypes = function ( searchTypes ) {
 260                 this.searchTypes = searchTypes;
 261                 this.validateSearchTypes();
 262         };
 263
 264         /**
 265          * Searches categories based on input and searchType.
 266          *
 267          * @private
 268          * @method
 269          * @param {string} input The input used to prefix search categories
 270          * @param {mw.widgets.CategorySelector.SearchType} searchType
 271          * @return {jQuery.Promise} Resolves with an array of categories
 272          */
 273         CSP.searchCategories = function ( input, searchType ) {
 274                 var deferred = $.Deferred(),
 275                         cacheKey = input + searchType.toString();
 276
 277                 // Check cache
 278                 if ( this.searchCache[ cacheKey ] !== undefined ) {
 279                         return this.searchCache[ cacheKey ];
 280                 }
 281
 282                 switch ( searchType ) {
 283                         case CategorySelector.SearchType.OpenSearch:
 284                                 this.api.get( {
 285                                         formatversion: 2,
 286                                         action: 'opensearch',
 287                                         namespace: NS_CATEGORY,
 288                                         limit: this.limit,
 289                                         search: input
 290                                 } ).done( function ( res ) {
 291                                         var categories = res[ 1 ];
 292                                         deferred.resolve( categories );
 293                                 } ).fail( deferred.reject.bind( deferred ) );
 294                                 break;
 295
 296                         case CategorySelector.SearchType.InternalSearch:
 297                                 this.api.get( {
 298                                         formatversion: 2,
 299                                         action: 'query',
 300                                         list: 'allpages',
 301                                         apnamespace: NS_CATEGORY,
 302                                         aplimit: this.limit,
 303                                         apfrom: input,
 304                                         apprefix: input
 305                                 } ).done( function ( res ) {
 306                                         var categories = res.query.allpages.map( function ( page ) {
 307                                                 return page.title;
 308                                         } );
 309                                         deferred.resolve( categories );
 310                                 } ).fail( deferred.reject.bind( deferred ) );
 311                                 break;
 312
 313                         case CategorySelector.SearchType.Exists:
 314                                 if ( input.indexOf( '|' ) > -1 ) {
 315                                         deferred.resolve( [] );
 316                                         break;
 317                                 }
 318
 319                                 this.api.get( {
 320                                         formatversion: 2,
 321                                         action: 'query',
 322                                         prop: 'info',
 323                                         titles: 'Category:' + input
 324                                 } ).done( function ( res ) {
 325                                         var categories = [];
 326
 327                                         $.each( res.query.pages, function ( index, page ) {
 328                                                 if ( !page.missing ) {
 329                                                         categories.push( page.title );
 330                                                 }
 331                                         } );
 332
 333                                         deferred.resolve( categories );
 334                                 } ).fail( deferred.reject.bind( deferred ) );
 335                                 break;
 336
 337                         case CategorySelector.SearchType.SubCategories:
 338                                 if ( input.indexOf( '|' ) > -1 ) {
 339                                         deferred.resolve( [] );
 340                                         break;
 341                                 }
 342
 343                                 this.api.get( {
 344                                         formatversion: 2,
 345                                         action: 'query',
 346                                         list: 'categorymembers',
 347                                         cmtype: 'subcat',
 348                                         cmlimit: this.limit,
 349                                         cmtitle: 'Category:' + input
 350                                 } ).done( function ( res ) {
 351                                         var categories = res.query.categorymembers.map( function ( category ) {
 352                                                 return category.title;
 353                                         } );
 354                                         deferred.resolve( categories );
 355                                 } ).fail( deferred.reject.bind( deferred ) );
 356                                 break;
 357
 358                         case CategorySelector.SearchType.ParentCategories:
 359                                 if ( input.indexOf( '|' ) > -1 ) {
 360                                         deferred.resolve( [] );
 361                                         break;
 362                                 }
 363
 364                                 this.api.get( {
 365                                         formatversion: 2,
 366                                         action: 'query',
 367                                         prop: 'categories',
 368                                         cllimit: this.limit,
 369                                         titles: 'Category:' + input
 370                                 } ).done( function ( res ) {
 371                                         var categories = [];
 372
 373                                         $.each( res.query.pages, function ( index, page ) {
 374                                                 if ( !page.missing && $.isArray( page.categories ) ) {
 375                                                         categories.push.apply( categories, page.categories.map( function ( category ) {
 376                                                                 return category.title;
 377                                                         } ) );
 378                                                 }
 379                                         } );
 380
 381                                         deferred.resolve( categories );
 382                                 } ).fail( deferred.reject.bind( deferred ) );
 383                                 break;
 384
 385                         default:
 386                                 throw new Error( 'Unknown searchType' );
 387                 }
 388
 389                 // Cache the result
 390                 this.searchCache[ cacheKey ] = deferred.promise();
 391
 392                 return deferred.promise();
 393         };
 394
 395         /**
 396          * @enum mw.widgets.CategorySelector.SearchType
 397          * Types of search available.
 398          */
 399         CategorySelector.SearchType = {
 400                 /** Search using action=opensearch */
 401                 OpenSearch: 0,
 402
 403                 /** Search using action=query */
 404                 InternalSearch: 1,
 405
 406                 /** Search for existing categories with the exact title */
 407                 Exists: 2,
 408
 409                 /** Search only subcategories  */
 410                 SubCategories: 3,
 411
 412                 /** Search only parent categories */
 413                 ParentCategories: 4
 414         };
 415
 416         mw.widgets.CategorySelector = CategorySelector;
 417 }( jQuery, mediaWiki ) );