mirror of
https://github.com/StarCitizenTools/mediawiki-skins-Citizen.git
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550 lines
18 KiB
JavaScript
550 lines
18 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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/**
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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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/* global addEvent, getDevicePixelRatio */
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window.WMTypeAhead = function(appendTo, searchInput) { // eslint-disable-line no-unused-vars
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var 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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thumbnailSize = getDevicePixelRatio() * 80,
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maxSearchResults = 6,
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searchLang,
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searchString,
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typeAheadItems,
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activeItem,
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ssActiveIndex;
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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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* Serializes a JS object into a URL parameter string.
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*
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* @param {Object} obj - object whose properties will be serialized
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* @return {string}
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*/
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function serialize(obj) {
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var serialized = [],
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prop;
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for (prop in obj) {
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if (obj.hasOwnProperty(prop)) { // eslint-disable-line no-prototype-builtins
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serialized.push(prop + '=' + encodeURIComponent(obj[prop]));
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}
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}
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return serialized.join('&');
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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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var 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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var 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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* 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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var searchScript = document.getElementById('api_opensearch');
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typeAheadEl.innerHTML = '';
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if (searchScript) {
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searchScript.src = false;
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}
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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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var 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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* 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, lang) {
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var script = document.getElementById('api_opensearch'),
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docHead = document.getElementsByTagName('head')[0],
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hostname,
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callbackIndex,
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searchQuery;
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// Variables declared in parent function.
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searchLang = encodeURIComponent(lang) || 'en';
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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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// Change sitename here
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// TODO: Make it configurable from the skin
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hostname = wgServer + wgScriptPath + '/api.php?';
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// If script already exists, remove it.
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if (script) {
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docHead.removeChild(script);
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}
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script = document.createElement('script');
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script.id = 'api_opensearch';
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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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action: 'query',
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format: 'json',
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generator: 'prefixsearch',
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prop: 'pageprops|pageimages|extracts',
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exlimit: '6',
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exintro: 1,
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exchars: '60',
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explaintext: 1,
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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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callback: 'callbackStack.queue[' + callbackIndex + ']'
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};
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script.src = hostname + serialize(searchQuery);
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docHead.appendChild(script);
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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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var 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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var 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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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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// Changed to TextExtracts
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pageDescription = page.extract || '';
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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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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: wgServer + '/' + 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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var 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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var 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) {
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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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for (item in suggestions) {
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result = suggestions[item];
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orderedResults[result.index - 1] = result;
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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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var 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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/**
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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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* @returns {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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attachedEvents.push( [ obj, evt, fn ] );
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obj.attachEvent( 'on' + evt, fn );
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}
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} |