mirror of
https://github.com/StarCitizenTools/mediawiki-skins-Citizen.git
synced 2024-11-15 18:40:05 +00:00
593 lines
17 KiB
JavaScript
593 lines
17 KiB
JavaScript
/**
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* Based on https://gerrit.wikimedia.org/g/wikimedia/portals/+/refs/heads/master
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* See T219590 for more details
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*/
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/* eslint-env node, es6 */
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/**
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* Below are additional dependency extracted from polyfills.js
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* TODO: Optimize and clear unneeded code
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*/
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/**
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* Detects reported or approximate device pixel ratio.
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* * 1.0 means 1 CSS pixel is 1 hardware pixel
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* * 2.0 means 1 CSS pixel is 2 hardware pixels
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* * etc.
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*
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* Uses window.devicePixelRatio if available, or CSS media queries on IE.
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*
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* @return {number} Device pixel ratio
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*/
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function getDevicePixelRatio() {
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if ( window.devicePixelRatio !== undefined ) {
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// Most web browsers:
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// * WebKit (Safari, Chrome, Android browser, etc)
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// * Opera
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// * Firefox 18+
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return window.devicePixelRatio;
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} else if ( window.msMatchMedia !== undefined ) {
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// Windows 8 desktops / tablets, probably Windows Phone 8
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//
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// IE 10 doesn't report pixel ratio directly, but we can get the
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// screen DPI and divide by 96. We'll bracket to [1, 1.5, 2.0] for
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// simplicity, but you may get different values depending on zoom
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// factor, size of screen and orientation in Metro IE.
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if ( window.msMatchMedia( '(min-resolution: 192dpi)' ).matches ) {
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return 2;
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} else if ( window.msMatchMedia( '(min-resolution: 144dpi)' ).matches ) {
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return 1.5;
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} else {
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return 1;
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}
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} else {
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// Legacy browsers...
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// Assume 1 if unknown.
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return 1;
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}
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}
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function addEvent( obj, evt, fn ) {
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if ( !obj ) {
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return;
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}
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if ( obj.addEventListener ) {
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obj.addEventListener( evt, fn, false );
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} else if ( obj.attachEvent ) {
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obj.attachedEvents.push( [ obj, evt, fn ] );
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obj.attachEvent( 'on' + evt, fn );
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}
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}
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/**
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* WMTypeAhead.
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* Displays search suggestions with thumbnail and description
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* as user types into an input field.
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*
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* @constructor
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* @param {string} appendTo - ID of a container element that the suggestions will be appended to.
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* @param {string} searchInput - ID of a search input whose value will be used to generate
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* search suggestions.
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*
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* @return {Object} Returns an object with the following properties:
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* @return {HTMLElement} return.typeAheadEl The type-ahead DOM object.
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* @return {Function} return.query A function that loads the type-ahead suggestions.
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*
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* @example
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* var typeAhead = new WMTypeAhead('containerID', 'inputID');
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* typeAhead.query('search string', 'en');
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*
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*/
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window.WMTypeAhead = function ( appendTo, searchInput ) {
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let typeAheadID = 'typeahead-suggestions',
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typeAheadEl = document.getElementById( typeAheadID ), // Type-ahead DOM element.
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appendEl = document.getElementById( appendTo ),
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searchEl = document.getElementById( searchInput ),
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server = mw.config.get( 'wgServer' ),
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articleurl = server + mw.config.get( 'wgArticlePath' ).replace( '$1', '' ),
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thumbnailSize = getDevicePixelRatio() * 80,
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descriptionSource = mw.config.get( 'wgCitizenSearchDescriptionSource' ),
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maxSearchResults = mw.config.get( 'wgCitizenMaxSearchResults' ),
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searchString,
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typeAheadItems,
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activeItem,
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ssActiveIndex,
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api = new mw.Api();
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// Only create typeAheadEl once on page.
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if ( !typeAheadEl ) {
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typeAheadEl = document.createElement( 'div' );
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typeAheadEl.id = typeAheadID;
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appendEl.appendChild( typeAheadEl );
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}
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/**
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* Keeps track of the search query callbacks. Consists of an array of
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* callback functions and an index that keeps track of the order of requests.
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* Callbacks are deleted by replacing the callback function with a no-op.
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*/
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window.callbackStack = {
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queue: {},
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index: -1,
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incrementIndex: function () {
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this.index += 1;
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return this.index;
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},
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addCallback: function ( func ) {
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const index = this.incrementIndex();
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this.queue[ index ] = func( index );
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return index;
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},
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deleteSelfFromQueue: function ( i ) {
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delete this.queue[ i ];
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},
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deletePrevCallbacks: function ( j ) {
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let callback;
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this.deleteSelfFromQueue( j );
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for ( callback in this.queue ) {
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if ( callback < j ) {
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this.queue[ callback ] = this.deleteSelfFromQueue.bind(
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window.callbackStack, callback
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);
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}
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}
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}
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};
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/**
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* Maintains the 'active' state on search suggestions.
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* Makes sure the 'active' element is synchronized between mouse and keyboard usage,
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* and cleared when new search suggestions appear.
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*/
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ssActiveIndex = {
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index: -1,
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max: maxSearchResults,
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setMax: function ( x ) {
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this.max = x;
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},
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increment: function ( i ) {
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this.index += i;
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if ( this.index < 0 ) {
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this.setIndex( this.max - 1 );
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} // Index reaches top
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if ( this.index === this.max ) {
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this.setIndex( 0 );
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} // Index reaches bottom
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return this.index;
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},
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setIndex: function ( i ) {
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if ( i <= this.max - 1 ) {
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this.index = i;
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}
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return this.index;
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},
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clear: function () {
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this.setIndex( -1 );
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}
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};
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/**
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* Removed the actual child nodes from typeAheadEl
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* @see {typeAheadEl}
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*/
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function clearTypeAheadElements() {
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if ( typeof typeAheadEl === 'undefined' ) {
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return;
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}
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while ( typeAheadEl.firstChild !== null ) {
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typeAheadEl.removeChild( typeAheadEl.firstChild );
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}
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}
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/**
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* Removes the type-ahead suggestions from the DOM.
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* Reason for timeout: The typeahead is set to clear on input blur.
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* When a user clicks on a search suggestion, they triggers the input blur
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* and remove the typeahead before a click event is registered.
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* The timeout makes it so a click on the search suggestion is registered before
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* an input blur.
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* 300ms is used to account for the click delay on mobile devices.
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*
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*/
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function clearTypeAhead() {
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setTimeout( function () {
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clearTypeAheadElements();
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ssActiveIndex.clear();
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}, 300 );
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}
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/**
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* Manually redirects the page to the href of a given element.
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*
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* For Chrome on Android to solve T221628.
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* When search suggestions below the fold are clicked, the blur event
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* on the search input is triggered and the page scrolls the search input
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* into view. However, the originating click event does not redirect
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* the page.
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*
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* @param {Event} e
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*/
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function forceLinkFollow( e ) {
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const el = e.relatedTarget;
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if ( el && /suggestion-link/.test( el.className ) ) {
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window.location = el.href;
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}
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}
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/**
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* Card displayed while loading search results
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* @return {string}
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*/
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function getLoadingIndicator() {
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return '<div class="suggestions-dropdown">' +
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'<div class="suggestion-link">' +
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'<div class="suggestion-text suggestion-placeholder">' +
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'<h3 class="suggestion-title"></h3>' +
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'<p class="suggestion-description"></p>' +
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'</div>' +
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'<div class="suggestion-thumbnail"></div>' +
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'</div>' +
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'</div>';
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}
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/**
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* Card displayed if no results could be found
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* @param {string} searchString - The search string.
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* @return {string}
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*/
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function getNoResultsIndicator( searchString ) {
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const titlemsg = mw.message( 'citizen-search-no-results-title', searchString ).text(),
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descmsg = mw.message( 'citizen-search-no-results-desc', searchString ).text();
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return '<div class="suggestions-dropdown" >' +
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'<div class="suggestion-link">' +
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'<div class="suggestion-text">' +
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'<h3 class="suggestion-title">' + titlemsg + '</h3>' +
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'<p class="suggestion-description">' + descmsg + '</p>' +
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'</div>' +
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'<div class="suggestion-thumbnail"></div>' +
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'</div>' +
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'</div>';
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}
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/**
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* Inserts script element containing the Search API results into document head.
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* The script itself calls the 'portalOpensearchCallback' callback function,
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*
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* @param {string} string - query string to search.
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* @param {string} lang - ISO code of language to search in.
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*/
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function loadQueryScript( string ) {
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let callbackIndex,
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searchQuery;
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// Variables declared in parent function.
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searchString = encodeURIComponent( string );
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if ( searchString.length === 0 ) {
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clearTypeAhead();
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return;
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}
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callbackIndex = window.callbackStack.addCallback( window.portalOpensearchCallback );
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// Removed description prop
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// TODO: Use text extract or PCS for description
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searchQuery = {
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generator: 'prefixsearch',
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prop: 'pageprops|pageimages',
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redirects: '',
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ppprop: 'displaytitle',
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piprop: 'thumbnail',
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pithumbsize: thumbnailSize,
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pilimit: maxSearchResults,
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gpssearch: string,
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gpsnamespace: 0,
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gpslimit: maxSearchResults
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};
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switch ( descriptionSource ) {
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case 'wikidata':
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searchQuery.prop += '|description';
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break;
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case 'textextracts':
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searchQuery.prop += '|extracts';
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searchQuery.exchars = '60';
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searchQuery.exintro = '1';
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searchQuery.exlimit = maxSearchResults;
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searchQuery.explaintext = '1';
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break;
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case 'pagedescription':
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searchQuery.prop += '|pageprops';
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searchQuery.ppprop = 'description';
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break;
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}
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typeAheadEl.innerHTML = getLoadingIndicator();
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api.get( searchQuery )
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.done( ( data ) => {
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clearTypeAheadElements();
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window.callbackStack.queue[ callbackIndex ]( data, string );
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} );
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} // END loadQueryScript
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/**
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* Highlights the part of the suggestion title that matches the search query.
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* Used inside the generateTemplateString function.
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*
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* @param {string} title - The title of the search suggestion.
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* @param {string} searchString - The string to highlight.
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* @return {string} The title with highlighted part in an <em> tag.
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*/
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function highlightTitle( title, searchString ) {
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let sanitizedSearchString = mw.html.escape( mw.RegExp.escape( searchString ) ),
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searchRegex = new RegExp( sanitizedSearchString, 'i' ),
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startHighlightIndex = title.search( searchRegex ),
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formattedTitle = mw.html.escape( title ),
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endHighlightIndex,
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strong,
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beforeHighlight,
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aferHighlight;
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if ( startHighlightIndex >= 0 ) {
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endHighlightIndex = startHighlightIndex + sanitizedSearchString.length;
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strong = title.substring( startHighlightIndex, endHighlightIndex );
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beforeHighlight = title.substring( 0, startHighlightIndex );
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aferHighlight = title.substring( endHighlightIndex, title.length );
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formattedTitle = beforeHighlight + mw.html.element( 'em', { class: 'suggestion-highlight' }, strong ) + aferHighlight;
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}
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return formattedTitle;
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} // END highlightTitle
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/**
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* Generates a template string based on an array of search suggestions.
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*
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* @param {Array} suggestions - An array of search suggestion results.
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* @return {string} A string representing the search suggestions DOM
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*/
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function generateTemplateString( suggestions ) {
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let string = '<div class="suggestions-dropdown">',
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suggestionLink,
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suggestionThumbnail,
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suggestionText,
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suggestionTitle,
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suggestionDescription,
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page,
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sanitizedThumbURL = false,
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descriptionText = '',
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pageDescription = '',
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i;
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if ( suggestions.length === 0 ) {
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return getNoResultsIndicator( searchString );
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}
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for ( i = 0; i < suggestions.length; i++ ) {
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if ( !suggestions[ i ] ) {
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continue;
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}
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page = suggestions[ i ];
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switch ( descriptionSource ) {
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case 'wikidata':
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pageDescription = page.description || '';
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break;
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case 'textextracts':
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pageDescription = page.extract || '';
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break;
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case 'pagedescription':
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pageDescription = page.pageprops.description || '';
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break;
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}
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// Ensure that the value from the previous iteration isn't used
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sanitizedThumbURL = false;
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if ( page.thumbnail && page.thumbnail.source ) {
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sanitizedThumbURL = page.thumbnail.source.replace( /"/g, '%22' );
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sanitizedThumbURL = sanitizedThumbURL.replace( /'/g, '%27' );
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}
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// Ensure that the value from the previous iteration isn't used
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descriptionText = '';
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// Check if description exists
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if ( pageDescription ) {
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// If the description is an array, use the first item
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if ( typeof pageDescription === 'object' && pageDescription[ 0 ] ) {
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descriptionText = pageDescription[ 0 ].toString();
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} else {
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// Otherwise, use the description as is.
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descriptionText = pageDescription.toString();
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}
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}
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// Filter out no text from TextExtracts
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if ( descriptionText === '...' ) {
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descriptionText = '';
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}
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suggestionDescription = mw.html.element( 'p', { class: 'suggestion-description' }, descriptionText );
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suggestionTitle = mw.html.element( 'h3', { class: 'suggestion-title' }, new mw.html.Raw( highlightTitle( page.title, searchString ) ) );
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suggestionText = mw.html.element( 'div', { class: 'suggestion-text' }, new mw.html.Raw( suggestionTitle + suggestionDescription ) );
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suggestionThumbnail = mw.html.element( 'div', {
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class: 'suggestion-thumbnail',
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style: ( sanitizedThumbURL ) ? 'background-image:url(' + sanitizedThumbURL + ')' : false
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}, '' );
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// TODO: Make it configurable from the skin
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suggestionLink = mw.html.element( 'a', {
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class: 'suggestion-link',
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href: articleurl + encodeURIComponent( page.title.replace( / /gi, '_' ) )
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}, new mw.html.Raw( suggestionText + suggestionThumbnail ) );
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string += suggestionLink;
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}
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string += '</div>';
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return string;
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} // END generateTemplateString
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/**
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* - Removes 'active' class from a collection of elements.
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* - Adds 'active' class to an item if missing.
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* - Removes 'active' class from item if present.
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*
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* @param {HTMLElement} item Item to add active class to.
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* @param {NodeList} collection Sibling items.
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*/
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function toggleActiveClass( item, collection ) {
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let activeClass = ' active', // Prefixed with space.
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colItem,
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i;
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for ( i = 0; i < collection.length; i++ ) {
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colItem = collection[ i ];
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// Remove the class name from everything except item.
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if ( colItem !== item ) {
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colItem.className = colItem.className.replace( activeClass, '' );
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} else {
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// If item has class name, remove it
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if ( / active/.test( item.className ) ) {
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item.className = item.className.replace( activeClass, '' );
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} else {
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// It item doesn't have class name, add it.
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item.className += activeClass;
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ssActiveIndex.setIndex( i );
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}
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}
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}
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}
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/**
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* Search API callback. Returns a closure that holds the index of the request.
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* Deletes previous callbacks based on this index. This prevents callbacks for old
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* requests from executing. Then:
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* - parses the search results
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* - generates the template String
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* - inserts the template string into the DOM
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* - attaches event listeners on each suggestion item.
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*
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* @param {number} i
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* @return {Function}
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*/
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window.portalOpensearchCallback = function ( i ) {
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let callbackIndex = i,
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orderedResults = [],
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suggestions,
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item,
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result,
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templateDOMString,
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listEl;
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return function ( xhrResults, queryString ) {
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window.callbackStack.deletePrevCallbacks( callbackIndex );
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if ( document.activeElement !== searchEl ) {
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return;
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}
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suggestions = ( xhrResults.query && xhrResults.query.pages ) ?
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xhrResults.query.pages : [];
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if ( suggestions.length === 0 ) {
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typeAheadEl.innerHTML = getNoResultsIndicator( queryString );
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return;
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}
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for ( item in suggestions ) {
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if ( Object.prototype.hasOwnProperty.call( suggestions, item ) ) {
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result = suggestions[ item ];
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orderedResults[ result.index - 1 ] = result;
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}
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}
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templateDOMString = generateTemplateString( orderedResults );
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ssActiveIndex.setMax( orderedResults.length );
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ssActiveIndex.clear();
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typeAheadEl.innerHTML = templateDOMString;
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typeAheadItems = typeAheadEl.childNodes[ 0 ].childNodes;
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// Attaching hover events
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for ( i = 0; i < typeAheadItems.length; i++ ) {
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listEl = typeAheadItems[ i ];
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// Requires the addEvent global polyfill
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addEvent( listEl, 'mouseenter', toggleActiveClass.bind( this, listEl, typeAheadItems ) );
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addEvent( listEl, 'mouseleave', toggleActiveClass.bind( this, listEl, typeAheadItems ) );
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}
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};
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};
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/**
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* Keyboard events: up arrow, down arrow and enter.
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* moves the 'active' suggestion up and down.
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*
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* @param {event} event
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*/
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function keyboardEvents( event ) {
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let e = event || window.event,
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keycode = e.which || e.keyCode,
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suggestionItems,
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searchSuggestionIndex;
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if ( !typeAheadEl.firstChild ) {
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return;
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}
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if ( keycode === 40 || keycode === 38 ) {
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suggestionItems = typeAheadEl.firstChild.childNodes;
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if ( keycode === 40 ) {
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searchSuggestionIndex = ssActiveIndex.increment( 1 );
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} else {
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searchSuggestionIndex = ssActiveIndex.increment( -1 );
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}
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activeItem = ( suggestionItems ) ? suggestionItems[ searchSuggestionIndex ] : false;
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toggleActiveClass( activeItem, suggestionItems );
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}
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if ( keycode === 13 && activeItem ) {
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if ( e.preventDefault ) {
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e.preventDefault();
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} else {
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( e.returnValue = false );
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}
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activeItem.children[ 0 ].click();
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}
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}
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addEvent( searchEl, 'keydown', keyboardEvents );
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addEvent( searchEl, 'blur', function ( e ) {
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clearTypeAhead();
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forceLinkFollow( e );
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} );
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return {
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typeAheadEl: typeAheadEl,
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query: loadQueryScript
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};
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};
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