resources/src/jquery/jquery.suggestions.js

   1 /**
   2  * This plugin provides a generic way to add suggestions to a text box.
   3  *
   4  * Set options:
   5  *
   6  *  $( '#textbox' ).suggestions( { option1: value1, option2: value2 } );
   7  *  $( '#textbox' ).suggestions( option, value );
   8  *
   9  * Initialize:
  10  *
  11  *  $( '#textbox' ).suggestions();
  12  *
  13  * @class jQuery.plugin.suggestions
  14  */
  15
  16 /**
  17  * @method suggestions
  18  * @chainable
  19  * @return {jQuery}
  20  *
  21  * @param {Object} options
  22  *
  23  * @param {Function} [options.fetch] Callback that should fetch suggestions and set the suggestions
  24  *  property. Called in context of the text box.
  25  * @param {string} options.fetch.query
  26  * @param {Function} options.fetch.response Callback to receive the suggestions with
  27  * @param {Array} options.fetch.response.suggestions
  28  * @param {number} options.fetch.maxRows
  29  *
  30  * @param {Function} [options.cancel] Callback function to call when any pending asynchronous
  31  *  suggestions fetches. Called in context of the text box.
  32  *
  33  * @param {Object} [options.special] Set of callbacks for rendering and selecting.
  34  *
  35  * @param {Function} options.special.render Called in context of the suggestions-special element.
  36  * @param {string} options.special.render.query
  37  * @param {Object} options.special.render.context
  38  *
  39  * @param {Function} options.special.select Called in context of the suggestions-result-current element.
  40  * @param {jQuery} options.special.select.$textbox
  41  *
  42  * @param {Object} [options.result] Set of callbacks for rendering and selecting
  43  *
  44  * @param {Function} options.result.render Called in context of the suggestions-result element.
  45  * @param {string} options.result.render.suggestion
  46  * @param {Object} options.result.render.context
  47  *
  48  * @param {Function} options.result.select Called in context of the suggestions-result-current element.
  49  * @param {jQuery} options.result.select.$textbox
  50  *
  51  * @param {Object} [options.update] Set of callbacks for listening to a change in the text input.
  52  *
  53  * @param {Function} options.update.before Called right after the user changes the textbox text.
  54  * @param {Function} options.update.after Called after results are updated either from the cache or
  55  * the API as a result of the user input.
  56  *
  57  * @param {jQuery} [options.$region=this] The element to place the suggestions below and match width of.
  58  *
  59  * @param {string[]} [options.suggestions] Array of suggestions to display.
  60  *
  61  * @param {number} [options.maxRows=10] Maximum number of suggestions to display at one time.
  62  *  Must be between 1 and 100.
  63  *
  64  * @param {number} [options.delay=120] Number of milliseconds to wait for the user to stop typing.
  65  *  Must be between 0 and 1200.
  66  *
  67  * @param {boolean} [options.cache=false] Whether to cache results from a fetch.
  68  *
  69  * @param {number} [options.cacheMaxAge=60000] Number of milliseconds to cache results from a fetch.
  70  *  Must be higher than 1. Defaults to 1 minute.
  71  *
  72  * @param {boolean} [options.submitOnClick=false] Whether to submit the form containing the textbox
  73  *  when a suggestion is clicked.
  74  *
  75  * @param {number} [options.maxExpandFactor=3] Maximum suggestions box width relative to the textbox
  76  *  width. If set to e.g. 2, the suggestions box will never be grown beyond 2 times the width of
  77  *  the textbox. Must be higher than 1.
  78  *
  79  * @param {string} [options.expandFrom=auto] Which direction to offset the suggestion box from.
  80  *  Values 'start' and 'end' translate to left and right respectively depending on the directionality
  81  *   of the current document, according to `$( document.documentElement ).css( 'direction' )`.
  82  *   Valid values: "left", "right", "start", "end", and "auto".
  83  *
  84  * @param {boolean} [options.positionFromLeft] Sets `expandFrom=left`, for backwards
  85  *  compatibility.
  86  *
  87  * @param {boolean} [options.highlightInput=false] Whether to highlight matched portions of the
  88  *  input or not.
  89  */
  90
  91 ( function () {
  92
  93         /**
  94          * Cancel any delayed maybeFetch() call and callback the context so
  95          * they can cancel any async fetching if they use AJAX or something.
  96          *
  97          * @param {Object} context
  98          */
  99         function cancel( context ) {
 100                 if ( context.data.timerID !== null ) {
 101                         clearTimeout( context.data.timerID );
 102                 }
 103                 if ( typeof context.config.cancel === 'function' ) {
 104                         context.config.cancel.call( context.data.$textbox );
 105                 }
 106         }
 107
 108         /**
 109          * Hide the element with suggestions and clean up some state.
 110          *
 111          * @param {Object} context
 112          */
 113         function hide( context ) {
 114                 // Remove any highlights, including on "special" items
 115                 context.data.$container.find( '.suggestions-result-current' ).removeClass( 'suggestions-result-current' );
 116                 // Hide the container
 117                 context.data.$container.hide();
 118         }
 119
 120         /**
 121          * Restore the text the user originally typed in the textbox, before it
 122          * was overwritten by highlight(). This restores the value the currently
 123          * displayed suggestions are based on, rather than the value just before
 124          * highlight() overwrote it; the former is arguably slightly more sensible.
 125          *
 126          * @param {Object} context
 127          */
 128         function restore( context ) {
 129                 context.data.$textbox.val( context.data.prevText );
 130         }
 131
 132         /**
 133          * @param {Object} context
 134          */
 135         function special( context ) {
 136                 // Allow custom rendering - but otherwise don't do any rendering
 137                 if ( typeof context.config.special.render === 'function' ) {
 138                         // Wait for the browser to update the value
 139                         setTimeout( function () {
 140                                 // Render special
 141                                 var $special = context.data.$container.find( '.suggestions-special' );
 142                                 context.config.special.render.call( $special, context.data.$textbox.val(), context );
 143                         }, 1 );
 144                 }
 145         }
 146
 147         /**
 148          * Ask the user-specified callback for new suggestions. Any previous delayed
 149          * call to this function still pending will be canceled. If the value in the
 150          * textbox is empty or hasn't changed since the last time suggestions were fetched,
 151          * this function does nothing.
 152          *
 153          * @param {Object} context
 154          * @param {boolean} delayed Whether or not to delay this by the currently configured amount of time
 155          */
 156         function update( context, delayed ) {
 157                 function maybeFetch() {
 158                         var val = context.data.$textbox.val(),
 159                                 cache = context.data.cache,
 160                                 cacheHit;
 161
 162                         if ( typeof context.config.update.before === 'function' ) {
 163                                 context.config.update.before.call( context.data.$textbox );
 164                         }
 165
 166                         // Only fetch if the value in the textbox changed and is not empty, or if the results were hidden
 167                         // if the textbox is empty then clear the result div, but leave other settings intouched
 168                         if ( val.length === 0 ) {
 169                                 hide( context );
 170                                 context.data.prevText = '';
 171                         } else if (
 172                                 val !== context.data.prevText ||
 173                                 // eslint-disable-next-line no-jquery/no-sizzle
 174                                 !context.data.$container.is( ':visible' )
 175                         ) {
 176                                 context.data.prevText = val;
 177                                 // Try cache first
 178                                 if ( context.config.cache && val in cache ) {
 179                                         if ( mw.now() - cache[ val ].timestamp < context.config.cacheMaxAge ) {
 180                                                 context.data.$textbox.suggestions( 'suggestions', cache[ val ].suggestions );
 181                                                 if ( typeof context.config.update.after === 'function' ) {
 182                                                         context.config.update.after.call( context.data.$textbox, cache[ val ].metadata );
 183                                                 }
 184                                                 cacheHit = true;
 185                                         } else {
 186                                                 // Cache expired
 187                                                 delete cache[ val ];
 188                                         }
 189                                 }
 190                                 if ( !cacheHit && typeof context.config.fetch === 'function' ) {
 191                                         context.config.fetch.call(
 192                                                 context.data.$textbox,
 193                                                 val,
 194                                                 function ( suggestions, metadata ) {
 195                                                         suggestions = suggestions.slice( 0, context.config.maxRows );
 196                                                         context.data.$textbox.suggestions( 'suggestions', suggestions );
 197                                                         if ( typeof context.config.update.after === 'function' ) {
 198                                                                 context.config.update.after.call( context.data.$textbox, metadata );
 199                                                         }
 200                                                         if ( context.config.cache ) {
 201                                                                 cache[ val ] = {
 202                                                                         suggestions: suggestions,
 203                                                                         metadata: metadata,
 204                                                                         timestamp: mw.now()
 205                                                                 };
 206                                                         }
 207                                                 },
 208                                                 context.config.maxRows
 209                                         );
 210                                 }
 211                         }
 212
 213                         // Always update special rendering
 214                         special( context );
 215                 }
 216
 217                 // Cancels any delayed maybeFetch call, and invokes context.config.cancel.
 218                 cancel( context );
 219
 220                 if ( delayed ) {
 221                         // To avoid many started/aborted requests while typing, we're gonna take a short
 222                         // break before trying to fetch data.
 223                         context.data.timerID = setTimeout( maybeFetch, context.config.delay );
 224                 } else {
 225                         maybeFetch();
 226                 }
 227         }
 228
 229         /**
 230          * Highlight a result in the results table
 231          *
 232          * @param {Object} context
 233          * @param {jQuery|string} result `<tr>` to highlight, or 'prev' or 'next'
 234          * @param {boolean} updateTextbox If true, put the suggestion in the textbox
 235          */
 236         function highlight( context, result, updateTextbox ) {
 237                 var selected = context.data.$container.find( '.suggestions-result-current' );
 238                 if ( !result.get || selected.get( 0 ) !== result.get( 0 ) ) {
 239                         if ( result === 'prev' ) {
 240                                 if ( selected.hasClass( 'suggestions-special' ) ) {
 241                                         result = context.data.$container.find( '.suggestions-result' ).last();
 242                                 } else {
 243                                         result = selected.prev();
 244                                         if ( !( result.length && result.hasClass( 'suggestions-result' ) ) ) {
 245                                                 // there is something in the DOM between selected element and the wrapper, bypass it
 246                                                 result = selected.parents( '.suggestions-results > *' ).prev().find( '.suggestions-result' ).eq( 0 );
 247                                         }
 248
 249                                         if ( selected.length === 0 ) {
 250                                                 // we are at the beginning, so lets jump to the last item
 251                                                 if ( context.data.$container.find( '.suggestions-special' ).html() !== '' ) {
 252                                                         result = context.data.$container.find( '.suggestions-special' );
 253                                                 } else {
 254                                                         result = context.data.$container.find( '.suggestions-results .suggestions-result' ).last();
 255                                                 }
 256                                         }
 257                                 }
 258                         } else if ( result === 'next' ) {
 259                                 if ( selected.length === 0 ) {
 260                                         // No item selected, go to the first one
 261                                         result = context.data.$container.find( '.suggestions-results .suggestions-result' ).first();
 262                                         if ( result.length === 0 && context.data.$container.find( '.suggestions-special' ).html() !== '' ) {
 263                                                 // No suggestion exists, go to the special one directly
 264                                                 result = context.data.$container.find( '.suggestions-special' );
 265                                         }
 266                                 } else {
 267                                         result = selected.next();
 268                                         if ( !( result.length && result.hasClass( 'suggestions-result' ) ) ) {
 269                                                 // there is something in the DOM between selected element and the wrapper, bypass it
 270                                                 result = selected.parents( '.suggestions-results > *' ).next().find( '.suggestions-result' ).eq( 0 );
 271                                         }
 272
 273                                         if ( selected.hasClass( 'suggestions-special' ) ) {
 274                                                 result = $( [] );
 275                                         } else if (
 276                                                 result.length === 0 &&
 277                                                 context.data.$container.find( '.suggestions-special' ).html() !== ''
 278                                         ) {
 279                                                 // We were at the last item, jump to the specials!
 280                                                 result = context.data.$container.find( '.suggestions-special' );
 281                                         }
 282                                 }
 283                         }
 284                         selected.removeClass( 'suggestions-result-current' );
 285                         result.addClass( 'suggestions-result-current' );
 286                 }
 287                 if ( updateTextbox ) {
 288                         if ( result.length === 0 || result.is( '.suggestions-special' ) ) {
 289                                 restore( context );
 290                         } else {
 291                                 context.data.$textbox.val( result.data( 'text' ) );
 292                                 // .val() doesn't call any event handlers, so
 293                                 // let the world know what happened
 294                                 context.data.$textbox.trigger( 'change' );
 295                         }
 296                         context.data.$textbox.trigger( 'change' );
 297                 }
 298         }
 299
 300         /**
 301          * Sets the value of a property, and updates the widget accordingly
 302          *
 303          * @param {Object} context
 304          * @param {string} property Name of property
 305          * @param {Mixed} value Value to set property with
 306          */
 307         function configure( context, property, value ) {
 308                 var newCSS,
 309                         $result, $results, $spanForWidth, childrenWidth,
 310                         regionIsFixed, regionPosition,
 311                         i, expWidth, maxWidth, text;
 312
 313                 // Validate creation using fallback values
 314                 switch ( property ) {
 315                         case 'fetch':
 316                         case 'cancel':
 317                         case 'special':
 318                         case 'result':
 319                         case 'update':
 320                         case '$region':
 321                         case 'expandFrom':
 322                                 context.config[ property ] = value;
 323                                 break;
 324                         case 'suggestions':
 325                                 context.config[ property ] = value;
 326                                 // Update suggestions
 327                                 if ( context.data !== undefined ) {
 328                                         if ( context.data.$textbox.val().length === 0 ) {
 329                                                 // Hide the div when no suggestion exist
 330                                                 hide( context );
 331                                         } else {
 332                                                 // Rebuild the suggestions list
 333                                                 context.data.$container.show();
 334                                                 // Update the size and position of the list
 335                                                 regionIsFixed = ( function () {
 336                                                         var $el = context.config.$region;
 337                                                         do {
 338                                                                 if ( $el.css( 'position' ) === 'fixed' ) {
 339                                                                         return true;
 340                                                                 }
 341                                                                 $el = $( $el[ 0 ].offsetParent );
 342                                                         } while ( $el.length );
 343                                                         return false;
 344                                                 }() );
 345                                                 regionPosition = regionIsFixed ?
 346                                                         context.config.$region[ 0 ].getBoundingClientRect() :
 347                                                         context.config.$region.offset();
 348                                                 newCSS = {
 349                                                         position: regionIsFixed ? 'fixed' : 'absolute',
 350                                                         top: regionPosition.top + context.config.$region.outerHeight(),
 351                                                         bottom: 'auto',
 352                                                         width: context.config.$region.outerWidth(),
 353                                                         height: 'auto'
 354                                                 };
 355
 356                                                 // Process expandFrom, after this it is set to left or right.
 357                                                 context.config.expandFrom = ( function ( expandFrom ) {
 358                                                         var regionWidth, docWidth, regionCenter, docCenter,
 359                                                                 isRTL = $( document.documentElement ).css( 'direction' ) === 'rtl',
 360                                                                 $region = context.config.$region;
 361
 362                                                         // Backwards compatible
 363                                                         if ( context.config.positionFromLeft ) {
 364                                                                 expandFrom = 'left';
 365
 366                                                         // Catch invalid values, default to 'auto'
 367                                                         } else if ( [ 'left', 'right', 'start', 'end', 'auto' ].indexOf( expandFrom ) === -1 ) {
 368                                                                 expandFrom = 'auto';
 369                                                         }
 370
 371                                                         if ( expandFrom === 'auto' ) {
 372                                                                 if ( $region.data( 'searchsuggest-expand-dir' ) ) {
 373                                                                         // If the markup explicitly contains a direction, use it.
 374                                                                         expandFrom = $region.data( 'searchsuggest-expand-dir' );
 375                                                                 } else {
 376                                                                         regionWidth = $region.outerWidth();
 377                                                                         docWidth = $( document ).width();
 378                                                                         if ( regionWidth > ( 0.85 * docWidth ) ) {
 379                                                                                 // If the input size takes up more than 85% of the document horizontally
 380                                                                                 // expand the suggestions to the writing direction's native end.
 381                                                                                 expandFrom = 'start';
 382                                                                         } else {
 383                                                                                 // Calculate the center points of the input and document
 384                                                                                 regionCenter = regionPosition.left + regionWidth / 2;
 385                                                                                 docCenter = docWidth / 2;
 386                                                                                 if ( Math.abs( regionCenter - docCenter ) < ( 0.10 * docCenter ) ) {
 387                                                                                         // If the input's center is within 10% of the document center
 388                                                                                         // use the writing direction's native end.
 389                                                                                         expandFrom = 'start';
 390                                                                                 } else {
 391                                                                                         // Otherwise expand the input from the closest side of the page,
 392                                                                                         // towards the side of the page with the most free open space
 393                                                                                         expandFrom = regionCenter > docCenter ? 'right' : 'left';
 394                                                                                 }
 395                                                                         }
 396                                                                 }
 397                                                         }
 398
 399                                                         if ( expandFrom === 'start' ) {
 400                                                                 expandFrom = isRTL ? 'right' : 'left';
 401
 402                                                         } else if ( expandFrom === 'end' ) {
 403                                                                 expandFrom = isRTL ? 'left' : 'right';
 404                                                         }
 405
 406                                                         return expandFrom;
 407
 408                                                 }( context.config.expandFrom ) );
 409
 410                                                 if ( context.config.expandFrom === 'left' ) {
 411                                                         // Expand from left
 412                                                         newCSS.left = regionPosition.left;
 413                                                         newCSS.right = 'auto';
 414                                                 } else {
 415                                                         // Expand from right
 416                                                         newCSS.left = 'auto';
 417                                                         newCSS.right = document.documentElement.clientWidth -
 418                                                                 ( regionPosition.left + context.config.$region.outerWidth() );
 419                                                 }
 420
 421                                                 context.data.$container.css( newCSS );
 422                                                 $results = context.data.$container.children( '.suggestions-results' );
 423                                                 $results.empty();
 424                                                 expWidth = -1;
 425                                                 for ( i = 0; i < context.config.suggestions.length; i++ ) {
 426                                                         text = context.config.suggestions[ i ];
 427                                                         $result = $( '<div>' )
 428                                                                 .addClass( 'suggestions-result' )
 429                                                                 .attr( 'rel', i )
 430                                                                 .data( 'text', context.config.suggestions[ i ] )
 431                                                                 .on( 'mousemove', function () {
 432                                                                         context.data.selectedWithMouse = true;
 433                                                                         highlight(
 434                                                                                 context,
 435                                                                                 $( this ).closest( '.suggestions-results .suggestions-result' ),
 436                                                                                 false
 437                                                                         );
 438                                                                 } )
 439                                                                 .appendTo( $results );
 440                                                         // Allow custom rendering
 441                                                         if ( typeof context.config.result.render === 'function' ) {
 442                                                                 context.config.result.render.call( $result, context.config.suggestions[ i ], context );
 443                                                         } else {
 444                                                                 $result.text( text );
 445                                                         }
 446
 447                                                         if ( context.config.highlightInput ) {
 448                                                                 $result.highlightText( context.data.prevText, { method: 'prefixHighlight' } );
 449                                                         }
 450
 451                                                         // Widen results box if needed (new width is only calculated here, applied later).
 452
 453                                                         // The monstrosity below accomplishes two things:
 454                                                         // * Wraps the text contents in a DOM element, so that we can know its width. There is
 455                                                         //   no way to directly access the width of a text node, and we can't use the parent
 456                                                         //   node width as it has text-overflow: ellipsis; and overflow: hidden; applied to
 457                                                         //   it, which trims it to a smaller width.
 458                                                         // * Temporarily applies position: absolute; to the wrapper to pull it out of normal
 459                                                         //   document flow. Otherwise the CSS text-overflow: ellipsis; and overflow: hidden;
 460                                                         //   rules would cause some browsers (at least all versions of IE from 6 to 11) to
 461                                                         //   still report the "trimmed" width. This should not be done in regular CSS
 462                                                         //   stylesheets as we don't want this rule to apply to other <span> elements, like
 463                                                         //   the ones generated by jquery.highlightText.
 464                                                         $spanForWidth = $result.wrapInner( '<span>' ).children();
 465                                                         childrenWidth = $spanForWidth.css( 'position', 'absolute' ).outerWidth();
 466                                                         $spanForWidth.contents().unwrap();
 467
 468                                                         if ( childrenWidth > $result.width() && childrenWidth > expWidth ) {
 469                                                                 // factor in any padding, margin, or border space on the parent
 470                                                                 expWidth = childrenWidth + ( context.data.$container.width() - $result.width() );
 471                                                         }
 472                                                 }
 473
 474                                                 // Apply new width for results box, if any
 475                                                 if ( expWidth > context.data.$container.width() ) {
 476                                                         maxWidth = context.config.maxExpandFactor * context.data.$textbox.width();
 477                                                         context.data.$container.width( Math.min( expWidth, maxWidth ) );
 478                                                 }
 479                                         }
 480                                 }
 481                                 break;
 482                         case 'maxRows':
 483                                 context.config[ property ] = Math.max( 1, Math.min( 100, value ) );
 484                                 break;
 485                         case 'delay':
 486                                 context.config[ property ] = Math.max( 0, Math.min( 1200, value ) );
 487                                 break;
 488                         case 'cacheMaxAge':
 489                                 context.config[ property ] = Math.max( 1, value );
 490                                 break;
 491                         case 'maxExpandFactor':
 492                                 context.config[ property ] = Math.max( 1, value );
 493                                 break;
 494                         case 'cache':
 495                         case 'submitOnClick':
 496                         case 'positionFromLeft':
 497                         case 'highlightInput':
 498                                 context.config[ property ] = !!value;
 499                                 break;
 500                 }
 501         }
 502
 503         /**
 504          * Respond to keypress event
 505          *
 506          * @param {jQuery.Event} e
 507          * @param {Object} context
 508          * @param {number} key Code of key pressed
 509          */
 510         function keypress( e, context, key ) {
 511                 var selected,
 512                         // eslint-disable-next-line no-jquery/no-sizzle
 513                         wasVisible = context.data.$container.is( ':visible' ),
 514                         preventDefault = false;
 515
 516                 switch ( key ) {
 517                         // Arrow down
 518                         case 40:
 519                                 if ( wasVisible ) {
 520                                         highlight( context, 'next', true );
 521                                         context.data.selectedWithMouse = false;
 522                                 } else {
 523                                         update( context, false );
 524                                 }
 525                                 preventDefault = true;
 526                                 break;
 527                         // Arrow up
 528                         case 38:
 529                                 if ( wasVisible ) {
 530                                         highlight( context, 'prev', true );
 531                                         context.data.selectedWithMouse = false;
 532                                 }
 533                                 preventDefault = wasVisible;
 534                                 break;
 535                         // Escape
 536                         case 27:
 537                                 hide( context );
 538                                 restore( context );
 539                                 cancel( context );
 540                                 context.data.$textbox.trigger( 'change' );
 541                                 preventDefault = wasVisible;
 542                                 break;
 543                         // Enter
 544                         case 13:
 545                                 preventDefault = wasVisible;
 546                                 selected = context.data.$container.find( '.suggestions-result-current' );
 547                                 hide( context );
 548                                 if ( selected.length === 0 || context.data.selectedWithMouse ) {
 549                                         // If nothing is selected or if something was selected with the mouse
 550                                         // cancel any current requests and allow the form to be submitted
 551                                         // (simply don't prevent default behavior).
 552                                         cancel( context );
 553                                         preventDefault = false;
 554                                 } else if ( selected.is( '.suggestions-special' ) ) {
 555                                         if ( typeof context.config.special.select === 'function' ) {
 556                                                 // Allow the callback to decide whether to prevent default or not
 557                                                 if ( context.config.special.select.call( selected, context.data.$textbox, 'keyboard' ) === true ) {
 558                                                         preventDefault = false;
 559                                                 }
 560                                         }
 561                                 } else {
 562                                         if ( typeof context.config.result.select === 'function' ) {
 563                                                 // Allow the callback to decide whether to prevent default or not
 564                                                 if ( context.config.result.select.call( selected, context.data.$textbox, 'keyboard' ) === true ) {
 565                                                         preventDefault = false;
 566                                                 }
 567                                         }
 568                                 }
 569                                 break;
 570                         default:
 571                                 update( context, true );
 572                                 break;
 573                 }
 574                 if ( preventDefault ) {
 575                         e.preventDefault();
 576                         e.stopPropagation();
 577                 }
 578         }
 579
 580         // See file header for method documentation
 581         $.fn.suggestions = function () {
 582                 // Multi-context fields
 583                 var args = arguments;
 584
 585                 $( this ).each( function () {
 586                         var context, key;
 587
 588                         /* Construction and Loading */
 589
 590                         context = $( this ).data( 'suggestions-context' );
 591                         if ( context === undefined || context === null ) {
 592                                 context = {
 593                                         config: {
 594                                                 fetch: function () {},
 595                                                 cancel: function () {},
 596                                                 special: {},
 597                                                 result: {},
 598                                                 update: {},
 599                                                 $region: $( this ),
 600                                                 suggestions: [],
 601                                                 maxRows: 10,
 602                                                 delay: 120,
 603                                                 cache: false,
 604                                                 cacheMaxAge: 60000,
 605                                                 submitOnClick: false,
 606                                                 maxExpandFactor: 3,
 607                                                 expandFrom: 'auto',
 608                                                 highlightInput: false
 609                                         }
 610                                 };
 611                         }
 612
 613                         /* API */
 614
 615                         // Handle various calling styles
 616                         if ( args.length > 0 ) {
 617                                 if ( typeof args[ 0 ] === 'object' ) {
 618                                         // Apply set of properties
 619                                         for ( key in args[ 0 ] ) {
 620                                                 configure( context, key, args[ 0 ][ key ] );
 621                                         }
 622                                 } else if ( typeof args[ 0 ] === 'string' ) {
 623                                         if ( args.length > 1 ) {
 624                                                 // Set property values
 625                                                 configure( context, args[ 0 ], args[ 1 ] );
 626                                         }
 627                                 }
 628                         }
 629
 630                         /* Initialization */
 631
 632                         if ( context.data === undefined ) {
 633                                 context.data = {
 634                                         // ID of running timer
 635                                         timerID: null,
 636
 637                                         // Text in textbox when suggestions were last fetched
 638                                         prevText: null,
 639
 640                                         // Cache of fetched suggestions
 641                                         cache: Object.create( null ),
 642
 643                                         // Number of results visible without scrolling
 644                                         visibleResults: 0,
 645
 646                                         // Suggestion the last mousedown event occurred on
 647                                         mouseDownOn: $( [] ),
 648                                         $textbox: $( this ),
 649                                         selectedWithMouse: false
 650                                 };
 651
 652                                 context.data.$container = $( '<div>' )
 653                                         .css( 'display', 'none' )
 654                                         .addClass( 'suggestions' )
 655                                         .append(
 656                                                 $( '<div>' ).addClass( 'suggestions-results' )
 657                                                         // Can't use click() because the container div is hidden when the
 658                                                         // textbox loses focus. Instead, listen for a mousedown followed
 659                                                         // by a mouseup on the same div.
 660                                                         .on( 'mousedown', function ( e ) {
 661                                                                 context.data.mouseDownOn = $( e.target ).closest( '.suggestions-results .suggestions-result' );
 662                                                         } )
 663                                                         .on( 'mouseup', function ( e ) {
 664                                                                 var $result = $( e.target ).closest( '.suggestions-results .suggestions-result' ),
 665                                                                         $other = context.data.mouseDownOn;
 666
 667                                                                 context.data.mouseDownOn = $( [] );
 668                                                                 if ( $result.get( 0 ) !== $other.get( 0 ) ) {
 669                                                                         return;
 670                                                                 }
 671                                                                 highlight( context, $result, true );
 672                                                                 if ( typeof context.config.result.select === 'function' ) {
 673                                                                         context.config.result.select.call( $result, context.data.$textbox, 'mouse' );
 674                                                                 }
 675                                                                 // Don't interfere with special clicks (e.g. to open in new tab)
 676                                                                 if ( !( e.which !== 1 || e.altKey || e.ctrlKey || e.shiftKey || e.metaKey ) ) {
 677                                                                         // This will hide the link we're just clicking on, which causes problems
 678                                                                         // when done synchronously in at least Firefox 3.6 (T64858).
 679                                                                         setTimeout( function () {
 680                                                                                 hide( context );
 681                                                                         } );
 682                                                                 }
 683                                                                 // Always bring focus to the textbox, as that's probably where the user expects it
 684                                                                 // if they were just typing.
 685                                                                 context.data.$textbox.trigger( 'focus' );
 686                                                         } )
 687                                         )
 688                                         .append(
 689                                                 $( '<div>' ).addClass( 'suggestions-special' )
 690                                                         // Can't use click() because the container div is hidden when the
 691                                                         // textbox loses focus. Instead, listen for a mousedown followed
 692                                                         // by a mouseup on the same div.
 693                                                         .on( 'mousedown', function ( e ) {
 694                                                                 context.data.mouseDownOn = $( e.target ).closest( '.suggestions-special' );
 695                                                         } )
 696                                                         .on( 'mouseup', function ( e ) {
 697                                                                 var $special = $( e.target ).closest( '.suggestions-special' ),
 698                                                                         $other = context.data.mouseDownOn;
 699
 700                                                                 context.data.mouseDownOn = $( [] );
 701                                                                 if ( $special.get( 0 ) !== $other.get( 0 ) ) {
 702                                                                         return;
 703                                                                 }
 704                                                                 if ( typeof context.config.special.select === 'function' ) {
 705                                                                         context.config.special.select.call( $special, context.data.$textbox, 'mouse' );
 706                                                                 }
 707                                                                 // Don't interfere with special clicks (e.g. to open in new tab)
 708                                                                 if ( !( e.which !== 1 || e.altKey || e.ctrlKey || e.shiftKey || e.metaKey ) ) {
 709                                                                         // This will hide the link we're just clicking on, which causes problems
 710                                                                         // when done synchronously in at least Firefox 3.6 (T64858).
 711                                                                         setTimeout( function () {
 712                                                                                 hide( context );
 713                                                                         } );
 714                                                                 }
 715                                                                 // Always bring focus to the textbox, as that's probably where the user expects it
 716                                                                 // if they were just typing.
 717                                                                 context.data.$textbox.trigger( 'focus' );
 718                                                         } )
 719                                                         .on( 'mousemove', function ( e ) {
 720                                                                 context.data.selectedWithMouse = true;
 721                                                                 highlight(
 722                                                                         context, $( e.target ).closest( '.suggestions-special' ), false
 723                                                                 );
 724                                                         } )
 725                                         )
 726                                         .appendTo( document.body );
 727
 728                                 $( this )
 729                                         // Stop browser autocomplete from interfering
 730                                         .attr( 'autocomplete', 'off' )
 731                                         .on( 'keydown', function ( e ) {
 732                                                 // Store key pressed to handle later
 733                                                 context.data.keypressed = e.which;
 734                                                 context.data.keypressedCount = 0;
 735                                         } )
 736                                         .on( 'keypress', function ( e ) {
 737                                                 context.data.keypressedCount++;
 738                                                 keypress( e, context, context.data.keypressed );
 739                                         } )
 740                                         .on( 'keyup', function ( e ) {
 741                                                 // The keypress event is fired when a key is pressed down and that key normally
 742                                                 // produces a character value. We also want to handle some keys that don't
 743                                                 // produce a character value so we also attach to the keydown/keyup events.
 744                                                 // List of codes sourced from
 745                                                 // https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode
 746                                                 var allowed = [
 747                                                         40, // up arrow
 748                                                         38, // down arrow
 749                                                         27, // escape
 750                                                         13, // enter
 751                                                         46, // delete
 752                                                         8 //   backspace
 753                                                 ];
 754                                                 if ( context.data.keypressedCount === 0 &&
 755                                                         e.which === context.data.keypressed &&
 756                                                         allowed.indexOf( e.which ) !== -1
 757                                                 ) {
 758                                                         keypress( e, context, context.data.keypressed );
 759                                                 }
 760                                         } )
 761                                         .on( 'blur', function () {
 762                                                 // When losing focus because of a mousedown
 763                                                 // on a suggestion, don't hide the suggestions
 764                                                 if ( context.data.mouseDownOn.length > 0 ) {
 765                                                         return;
 766                                                 }
 767                                                 hide( context );
 768                                                 cancel( context );
 769                                         } );
 770                                 // Load suggestions if the value is changed because there are already
 771                                 // typed characters before the JavaScript is loaded.
 772                                 if ( $( this ).is( ':focus' ) && this.value !== this.defaultValue ) {
 773                                         update( context, false );
 774                                 }
 775                         }
 776
 777                         // Store the context for next time
 778                         $( this ).data( 'suggestions-context', context );
 779                 } );
 780                 return this;
 781         };
 782
 783         /**
 784          * @class jQuery
 785          * @mixins jQuery.plugin.suggestions
 786          */
 787
 788 }() );