resources/src/jquery/jquery.makeCollapsible.js

   1 /**
   2  * jQuery makeCollapsible
   3  * Note: To avoid performance issues such as reflows, several styles are
   4  * shipped in mediawiki.makeCollapsible.styles to reserve space for the toggle control. Please
   5  * familiarise yourself with that CSS before making any changes to this code.
   6  *
   7  * Dual licensed:
   8  * - CC BY 3.0 <http://creativecommons.org/licenses/by/3.0>
   9  * - GPL2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
  10  *
  11  * @class jQuery.plugin.makeCollapsible
  12  */
  13 ( function () {
  14         /**
  15          * Handler for a click on a collapsible toggler.
  16          *
  17          * @private
  18          * @param {jQuery} $collapsible
  19          * @param {string} action The action this function will take ('expand' or 'collapse').
  20          * @param {jQuery|null} [$defaultToggle]
  21          * @param {Object|undefined} [options]
  22          */
  23         function toggleElement( $collapsible, action, $defaultToggle, options ) {
  24                 var $collapsibleContent, $containers, hookCallback;
  25                 options = options || {};
  26
  27                 // Validate parameters
  28
  29                 // $collapsible must be an instance of jQuery
  30                 if ( !$collapsible.jquery ) {
  31                         return;
  32                 }
  33                 if ( action !== 'expand' && action !== 'collapse' ) {
  34                         // action must be string with 'expand' or 'collapse'
  35                         return;
  36                 }
  37                 if ( $defaultToggle === undefined ) {
  38                         $defaultToggle = null;
  39                 }
  40
  41                 // Trigger a custom event to allow callers to hook to the collapsing/expanding,
  42                 // allowing the module to be testable, and making it possible to
  43                 // e.g. implement persistence via cookies
  44                 $collapsible.trigger( action === 'expand' ? 'beforeExpand.mw-collapsible' : 'beforeCollapse.mw-collapsible' );
  45                 hookCallback = function () {
  46                         $collapsible.trigger( action === 'expand' ? 'afterExpand.mw-collapsible' : 'afterCollapse.mw-collapsible' );
  47                 };
  48
  49                 // Handle different kinds of elements
  50                 if ( !options.plainMode && $collapsible.is( 'table' ) ) {
  51                         // Tables
  52                         // If there is a caption, hide all rows; otherwise, only hide body rows
  53                         if ( $collapsible.find( '> caption' ).length ) {
  54                                 $containers = $collapsible.find( '> * > tr' );
  55                         } else {
  56                                 $containers = $collapsible.find( '> tbody > tr' );
  57                         }
  58                         if ( $defaultToggle ) {
  59                                 // Exclude table row containing togglelink
  60                                 $containers = $containers.not( $defaultToggle.closest( 'tr' ) );
  61                         }
  62
  63                 } else if ( !options.plainMode && ( $collapsible.is( 'ul' ) || $collapsible.is( 'ol' ) ) ) {
  64                         // Lists
  65                         $containers = $collapsible.find( '> li' );
  66                         if ( $defaultToggle ) {
  67                                 // Exclude list-item containing togglelink
  68                                 $containers = $containers.not( $defaultToggle.parent() );
  69                         }
  70                 } else {
  71                         // Everything else: <div>, <p> etc.
  72                         $collapsibleContent = $collapsible.find( '> .mw-collapsible-content' );
  73
  74                         // If a collapsible-content is defined, act on it
  75                         if ( !options.plainMode && $collapsibleContent.length ) {
  76                                 $containers = $collapsibleContent;
  77
  78                         // Otherwise assume this is a customcollapse with a remote toggle
  79                         // .. and there is no collapsible-content because the entire element should be toggled
  80                         } else {
  81                                 $containers = $collapsible;
  82                         }
  83                 }
  84
  85                 $containers.toggle( action === 'expand' );
  86                 hookCallback();
  87         }
  88
  89         /**
  90          * Handle clicking/keypressing on the collapsible element toggle and other
  91          * situations where a collapsible element is toggled (e.g. the initial
  92          * toggle for collapsed ones).
  93          *
  94          * @private
  95          * @param {jQuery} $toggle the clickable toggle itself
  96          * @param {jQuery} $collapsible the collapsible element
  97          * @param {jQuery.Event|null} e either the event or null if unavailable
  98          * @param {Object|undefined} options
  99          */
 100         function togglingHandler( $toggle, $collapsible, e, options ) {
 101                 var wasCollapsed, $textContainer, collapseText, expandText;
 102                 options = options || {};
 103
 104                 if ( e ) {
 105                         if (
 106                                 e.type === 'click' &&
 107                                 e.target.nodeName.toLowerCase() === 'a' &&
 108                                 $( e.target ).attr( 'href' )
 109                         ) {
 110                                 // Don't fire if a link was clicked (for premade togglers)
 111                                 return;
 112                         } else if ( e.type === 'keypress' && e.which !== 13 && e.which !== 32 ) {
 113                                 // Only handle keypresses on the "Enter" or "Space" keys
 114                                 return;
 115                         } else {
 116                                 e.preventDefault();
 117                                 e.stopPropagation();
 118                         }
 119                 }
 120
 121                 // This allows the element to be hidden on initial toggle without fiddling with the class
 122                 if ( options.wasCollapsed !== undefined ) {
 123                         wasCollapsed = options.wasCollapsed;
 124                 } else {
 125                         wasCollapsed = $collapsible.hasClass( 'mw-collapsed' );
 126                 }
 127
 128                 // Toggle the state of the collapsible element (that is, expand or collapse)
 129                 $collapsible.toggleClass( 'mw-collapsed', !wasCollapsed );
 130
 131                 // Toggle the mw-collapsible-toggle classes, if requested (for default and premade togglers by default)
 132                 if ( options.toggleClasses ) {
 133                         $toggle
 134                                 .toggleClass( 'mw-collapsible-toggle-collapsed', !wasCollapsed )
 135                                 .toggleClass( 'mw-collapsible-toggle-expanded', wasCollapsed );
 136                 }
 137
 138                 // Toggle the text ("Show"/"Hide") within elements tagged with mw-collapsible-text
 139                 if ( options.toggleText ) {
 140                         collapseText = options.toggleText.collapseText;
 141                         expandText = options.toggleText.expandText;
 142
 143                         $textContainer = $toggle.find( '.mw-collapsible-text' );
 144                         if ( $textContainer.length ) {
 145                                 $textContainer.text( wasCollapsed ? collapseText : expandText );
 146                         }
 147                 }
 148
 149                 // And finally toggle the element state itself
 150                 toggleElement( $collapsible, wasCollapsed ? 'expand' : 'collapse', $toggle, options );
 151         }
 152
 153         /**
 154          * Enable collapsible-functionality on all elements in the collection.
 155          *
 156          * - Will prevent binding twice to the same element.
 157          * - Initial state is expanded by default, this can be overridden by adding class
 158          *   "mw-collapsed" to the "mw-collapsible" element.
 159          * - Elements made collapsible have jQuery data "mw-made-collapsible" set to true.
 160          * - The inner content is wrapped in a "div.mw-collapsible-content" (except for tables and lists).
 161          *
 162          * @param {Object} [options]
 163          * @param {string} [options.collapseText] Text used for the toggler, when clicking it would
 164          *   collapse the element. Default: the 'data-collapsetext' attribute of the
 165          *   collapsible element or the content of 'collapsible-collapse' message.
 166          * @param {string} [options.expandText] Text used for the toggler, when clicking it would
 167          *   expand the element. Default: the 'data-expandtext' attribute of the
 168          *   collapsible element or the content of 'collapsible-expand' message.
 169          * @param {boolean} [options.collapsed] Whether to collapse immediately. By default
 170          *   collapse only if the element has the 'mw-collapsed' class.
 171          * @param {jQuery} [options.$customTogglers] Elements to be used as togglers
 172          *   for this collapsible element. By default, if the collapsible element
 173          *   has an id attribute like 'mw-customcollapsible-XXX', elements with a
 174          *   *class* of 'mw-customtoggle-XXX' are made togglers for it.
 175          * @param {boolean} [options.plainMode=false] Whether to use a "plain mode" when making the
 176          *   element collapsible - that is, hide entire tables and lists (instead
 177          *   of hiding only all rows but first of tables, and hiding each list
 178          *   item separately for lists) and don't wrap other elements in
 179          *   div.mw-collapsible-content. May only be used with custom togglers.
 180          * @return {jQuery}
 181          * @chainable
 182          */
 183         $.fn.makeCollapsible = function ( options ) {
 184                 options = options || {};
 185
 186                 this.each( function () {
 187                         var $collapsible, collapseText, expandText, $caption, $toggle, actionHandler,
 188                                 buildDefaultToggleLink, $firstItem, collapsibleId, $customTogglers, firstval;
 189
 190                         // Ensure class "mw-collapsible" is present in case .makeCollapsible()
 191                         // is called on element(s) that don't have it yet.
 192                         $collapsible = $( this ).addClass( 'mw-collapsible' );
 193
 194                         // Return if it has been enabled already.
 195                         if ( $collapsible.data( 'mw-made-collapsible' ) ) {
 196                                 return;
 197                         } else {
 198                                 // Let CSS know that it no longer needs to worry about flash of unstyled content.
 199                                 // This will allow mediawiki.makeCollapsible.styles to disable temporary pseudo elements, that
 200                                 // are needed to avoid a flash of unstyled content.
 201                                 $collapsible.addClass( 'mw-made-collapsible' )
 202                                         .data( 'mw-made-collapsible', true );
 203                         }
 204
 205                         // Use custom text or default?
 206                         collapseText = options.collapseText || $collapsible.attr( 'data-collapsetext' ) || mw.msg( 'collapsible-collapse' );
 207                         expandText = options.expandText || $collapsible.attr( 'data-expandtext' ) || mw.msg( 'collapsible-expand' );
 208
 209                         // Default click/keypress handler and toggle link to use when none is present
 210                         actionHandler = function ( e, opts ) {
 211                                 var defaultOpts = {
 212                                         toggleClasses: true,
 213                                         toggleText: { collapseText: collapseText, expandText: expandText }
 214                                 };
 215                                 opts = $.extend( defaultOpts, options, opts );
 216                                 togglingHandler( $( this ), $collapsible, e, opts );
 217                         };
 218
 219                         // Default toggle link. Only build it when needed to avoid jQuery memory leaks (event data).
 220                         buildDefaultToggleLink = function () {
 221                                 return $( '<a class="mw-collapsible-text"></a>' )
 222                                         .text( collapseText )
 223                                         .wrap( '<span class="mw-collapsible-toggle mw-collapsible-toggle-default"></span>' )
 224                                         .parent()
 225                                         .attr( {
 226                                                 role: 'button',
 227                                                 tabindex: 0
 228                                         } );
 229                         };
 230
 231                         // Check if this element has a custom position for the toggle link
 232                         // (ie. outside the container or deeper inside the tree)
 233                         if ( options.$customTogglers ) {
 234                                 $customTogglers = $( options.$customTogglers );
 235                         } else {
 236                                 collapsibleId = $collapsible.attr( 'id' ) || '';
 237                                 if ( collapsibleId.indexOf( 'mw-customcollapsible-' ) === 0 ) {
 238                                         $customTogglers = $( '.' + collapsibleId.replace( 'mw-customcollapsible', 'mw-customtoggle' ) )
 239                                                 .addClass( 'mw-customtoggle' );
 240                                 }
 241                         }
 242
 243                         // Add event handlers to custom togglers or create our own ones
 244                         if ( $customTogglers && $customTogglers.length ) {
 245                                 actionHandler = function ( e, opts ) {
 246                                         var defaultOpts = {};
 247                                         opts = $.extend( defaultOpts, options, opts );
 248                                         togglingHandler( $( this ), $collapsible, e, opts );
 249                                 };
 250
 251                                 $toggle = $customTogglers;
 252
 253                         } else {
 254                                 // If this is not a custom case, do the default: wrap the
 255                                 // contents and add the toggle link. Different elements are
 256                                 // treated differently.
 257
 258                                 if ( $collapsible.is( 'table' ) ) {
 259
 260                                         // If the table has a caption, collapse to the caption
 261                                         // as opposed to the first row
 262                                         $caption = $collapsible.find( '> caption' );
 263                                         if ( $caption.length ) {
 264                                                 $toggle = $caption.find( '> .mw-collapsible-toggle' );
 265
 266                                                 // If there is no toggle link, add it to the end of the caption
 267                                                 if ( !$toggle.length ) {
 268                                                         $toggle = buildDefaultToggleLink().appendTo( $caption );
 269                                                 }
 270                                         } else {
 271                                                 // The toggle-link will be in one of the cells (td or th) of the first row
 272                                                 $firstItem = $collapsible.find( 'tr:first th, tr:first td' );
 273                                                 $toggle = $firstItem.find( '> .mw-collapsible-toggle' );
 274
 275                                                 // If theres no toggle link, add it to the last cell
 276                                                 if ( !$toggle.length ) {
 277                                                         $toggle = buildDefaultToggleLink().prependTo( $firstItem.eq( -1 ) );
 278                                                 }
 279                                         }
 280
 281                                 } else if ( $collapsible.parent().is( 'li' ) &&
 282                                         $collapsible.parent().children( '.mw-collapsible' ).length === 1 &&
 283                                         $collapsible.find( '> .mw-collapsible-toggle' ).length === 0
 284                                 ) {
 285                                         // special case of one collapsible in <li> tag
 286                                         $toggle = buildDefaultToggleLink();
 287                                         $collapsible.before( $toggle );
 288                                 } else if ( $collapsible.is( 'ul' ) || $collapsible.is( 'ol' ) ) {
 289                                         // The toggle-link will be in the first list-item
 290                                         $firstItem = $collapsible.find( 'li:first' );
 291                                         $toggle = $firstItem.find( '> .mw-collapsible-toggle' );
 292
 293                                         // If theres no toggle link, add it
 294                                         if ( !$toggle.length ) {
 295                                                 // Make sure the numeral order doesn't get messed up, force the first (soon to be second) item
 296                                                 // to be "1". Except if the value-attribute is already used.
 297                                                 // If no value was set WebKit returns "", Mozilla returns '-1', others return 0, null or undefined.
 298                                                 firstval = $firstItem.prop( 'value' );
 299                                                 if ( firstval === undefined || !firstval || firstval === '-1' || firstval === -1 ) {
 300                                                         $firstItem.prop( 'value', '1' );
 301                                                 }
 302                                                 $toggle = buildDefaultToggleLink();
 303                                                 $toggle.wrap( '<li class="mw-collapsible-toggle-li"></li>' ).parent().prependTo( $collapsible );
 304                                         }
 305
 306                                 } else { // <div>, <p> etc.
 307
 308                                         // The toggle-link will be the first child of the element
 309                                         $toggle = $collapsible.find( '> .mw-collapsible-toggle' );
 310
 311                                         // If a direct child .content-wrapper does not exists, create it
 312                                         if ( !$collapsible.find( '> .mw-collapsible-content' ).length ) {
 313                                                 $collapsible.wrapInner( '<div class="mw-collapsible-content"></div>' );
 314                                         }
 315
 316                                         // If theres no toggle link, add it
 317                                         if ( !$toggle.length ) {
 318                                                 $toggle = buildDefaultToggleLink().prependTo( $collapsible );
 319                                         }
 320                                 }
 321                         }
 322
 323                         // Attach event handlers to togglelink
 324                         $toggle.on( 'click.mw-collapsible keypress.mw-collapsible', actionHandler )
 325                                 .prop( 'tabIndex', 0 );
 326
 327                         $( this ).data( 'mw-collapsible', {
 328                                 collapse: function () {
 329                                         actionHandler.call( $toggle.get( 0 ), null, { wasCollapsed: false } );
 330                                 },
 331                                 expand: function () {
 332                                         actionHandler.call( $toggle.get( 0 ), null, { wasCollapsed: true } );
 333                                 },
 334                                 toggle: function () {
 335                                         actionHandler.call( $toggle.get( 0 ), null, null );
 336                                 }
 337                         } );
 338
 339                         // Initial state
 340                         if ( options.collapsed || $collapsible.hasClass( 'mw-collapsed' ) ) {
 341                                 // One toggler can hook to multiple elements, and one element can have
 342                                 // multiple togglers. This is the sanest way to handle that.
 343                                 actionHandler.call( $toggle.get( 0 ), null, { wasCollapsed: false } );
 344                         }
 345
 346                 } );
 347
 348                 /**
 349                  * Fired after collapsible content has been initialized
 350                  *
 351                  * This gives an option to modify the collapsible behavior.
 352                  *
 353                  * @event wikipage_collapsibleContent
 354                  * @member mw.hook
 355                  * @param {jQuery} $content All the elements that have been made collapsible
 356                  */
 357                 mw.hook( 'wikipage.collapsibleContent' ).fire( this );
 358
 359                 return this;
 360         };
 361
 362         /**
 363          * @class jQuery
 364          * @mixins jQuery.plugin.makeCollapsible
 365          */
 366
 367 }() );