247 lines
9.1 KiB
JavaScript
247 lines
9.1 KiB
JavaScript
/**
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* Insight search plugin
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* @author PPOffice { @link https://github.com/ppoffice }
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*/
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(function ($, CONFIG) {
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var $main = $('.ins-search');
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var $input = $main.find('.ins-search-input');
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var $wrapper = $main.find('.ins-section-wrapper');
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var $container = $main.find('.ins-section-container');
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$main.parent().remove('.ins-search');
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$('body').append($main);
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// https://stackoverflow.com/questions/1147359/how-to-decode-html-entities-using-jquery#answer-1395954
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function decodeEntities(encodedString) {
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var textArea = document.createElement('textarea');
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textArea.innerHTML = encodedString;
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return textArea.value;
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}
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function section (title) {
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return $('<section>').addClass('ins-section')
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.append($('<header>').addClass('ins-section-header').text(title));
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}
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function searchItem (icon, title, slug, preview, url) {
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return $('<div>').addClass('ins-selectable').addClass('ins-search-item')
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.append($('<header>').append($('<i>').addClass('fa').addClass('fa-' + icon)).append(title != null && title != '' ? title : CONFIG.TRANSLATION['UNTITLED'])
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.append(slug ? $('<span>').addClass('ins-slug').text(slug) : null))
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.append(preview ? $('<p>').addClass('ins-search-preview').text(decodeEntities(preview)) : null)
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.attr('data-url', url);
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}
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function sectionFactory (type, array) {
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var sectionTitle;
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var $searchItems;
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if (array.length === 0) return null;
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sectionTitle = CONFIG.TRANSLATION[type];
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switch (type) {
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case 'POSTS':
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case 'PAGES':
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$searchItems = array.map(function (item) {
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// Use config.root instead of permalink to fix url issue
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return searchItem('file', item.title, null, item.text.slice(0, 150), CONFIG.ROOT_URL + item.path);
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});
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break;
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case 'CATEGORIES':
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case 'TAGS':
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$searchItems = array.map(function (item) {
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return searchItem(type === 'CATEGORIES' ? 'folder' : 'tag', item.name, item.slug, null, item.permalink);
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});
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break;
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default:
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return null;
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}
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return section(sectionTitle).append($searchItems);
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}
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function extractToSet (json, key) {
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var values = {};
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var entries = json.pages.concat(json.posts);
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entries.forEach(function (entry) {
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if (entry[key]) {
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entry[key].forEach(function (value) {
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values[value.name] = value;
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});
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}
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});
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var result = [];
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for (var key in values) {
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result.push(values[key]);
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}
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return result;
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}
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function parseKeywords (keywords) {
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return keywords.split(' ').filter(function (keyword) {
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return !!keyword;
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}).map(function (keyword) {
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return keyword.toUpperCase();
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});
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}
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/**
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* Judge if a given post/page/category/tag contains all of the keywords.
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* @param Object obj Object to be weighted
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* @param Array<String> fields Object's fields to find matches
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*/
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function filter (keywords, obj, fields) {
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var result = false;
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var keywordArray = parseKeywords(keywords);
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var containKeywords = keywordArray.filter(function (keyword) {
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var containFields = fields.filter(function (field) {
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if (!obj.hasOwnProperty(field))
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return false;
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if (obj[field].toUpperCase().indexOf(keyword) > -1)
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return true;
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});
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if (containFields.length > 0)
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return true;
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return false;
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});
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return containKeywords.length === keywordArray.length;
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}
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function filterFactory (keywords) {
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return {
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POST: function (obj) {
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return filter(keywords, obj, ['title', 'text']);
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},
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PAGE: function (obj) {
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return filter(keywords, obj, ['title', 'text']);
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},
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CATEGORY: function (obj) {
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return filter(keywords, obj, ['name', 'slug']);
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},
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TAG: function (obj) {
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return filter(keywords, obj, ['name', 'slug']);
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}
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};
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}
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/**
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* Calculate the weight of a matched post/page/category/tag.
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* @param Object obj Object to be weighted
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* @param Array<String> fields Object's fields to find matches
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* @param Array<Integer> weights Weight of every field
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*/
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function weight (keywords, obj, fields, weights) {
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var value = 0;
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parseKeywords(keywords).forEach(function (keyword) {
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var pattern = new RegExp(keyword, 'img'); // Global, Multi-line, Case-insensitive
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fields.forEach(function (field, index) {
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if (obj.hasOwnProperty(field)) {
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var matches = obj[field].match(pattern);
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value += matches ? matches.length * weights[index] : 0;
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}
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});
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});
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return value;
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}
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function weightFactory (keywords) {
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return {
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POST: function (obj) {
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return weight(keywords, obj, ['title', 'text'], [3, 1]);
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},
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PAGE: function (obj) {
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return weight(keywords, obj, ['title', 'text'], [3, 1]);
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},
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CATEGORY: function (obj) {
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return weight(keywords, obj, ['name', 'slug'], [1, 1]);
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},
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TAG: function (obj) {
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return weight(keywords, obj, ['name', 'slug'], [1, 1]);
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}
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};
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}
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function search (json, keywords) {
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var WEIGHTS = weightFactory(keywords);
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var FILTERS = filterFactory(keywords);
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var posts = json.posts;
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var pages = json.pages;
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var tags = extractToSet(json, 'tags');
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var categories = extractToSet(json, 'categories');
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return {
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posts: posts.filter(FILTERS.POST).sort(function (a, b) { return WEIGHTS.POST(b) - WEIGHTS.POST(a); }).slice(0, 5),
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pages: pages.filter(FILTERS.PAGE).sort(function (a, b) { return WEIGHTS.PAGE(b) - WEIGHTS.PAGE(a); }).slice(0, 5),
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categories: categories.filter(FILTERS.CATEGORY).sort(function (a, b) { return WEIGHTS.CATEGORY(b) - WEIGHTS.CATEGORY(a); }).slice(0, 5),
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tags: tags.filter(FILTERS.TAG).sort(function (a, b) { return WEIGHTS.TAG(b) - WEIGHTS.TAG(a); }).slice(0, 5)
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};
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}
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function searchResultToDOM (searchResult) {
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$container.empty();
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for (var key in searchResult) {
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$container.append(sectionFactory(key.toUpperCase(), searchResult[key]));
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}
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}
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function scrollTo ($item) {
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if ($item.length === 0) return;
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var wrapperHeight = $wrapper[0].clientHeight;
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var itemTop = $item.position().top - $wrapper.scrollTop();
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var itemBottom = $item[0].clientHeight + $item.position().top;
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if (itemBottom > wrapperHeight + $wrapper.scrollTop()) {
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$wrapper.scrollTop(itemBottom - $wrapper[0].clientHeight);
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}
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if (itemTop < 0) {
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$wrapper.scrollTop($item.position().top);
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}
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}
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function selectItemByDiff (value) {
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var $items = $.makeArray($container.find('.ins-selectable'));
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var prevPosition = -1;
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$items.forEach(function (item, index) {
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if ($(item).hasClass('active')) {
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prevPosition = index;
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return;
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}
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});
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var nextPosition = ($items.length + prevPosition + value) % $items.length;
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$($items[prevPosition]).removeClass('active');
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$($items[nextPosition]).addClass('active');
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scrollTo($($items[nextPosition]));
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}
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function gotoLink ($item) {
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if ($item && $item.length) {
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location.href = $item.attr('data-url');
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}
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}
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$.getJSON(CONFIG.CONTENT_URL, function (json) {
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if (location.hash.trim() === '#ins-search') {
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$main.addClass('show');
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}
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$input.on('input', function () {
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var keywords = $(this).val();
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searchResultToDOM(search(json, keywords));
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});
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$input.trigger('input');
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});
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$(document).on('click focus', '.search-form-input', function () {
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$main.addClass('show');
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$main.find('.ins-search-input').focus();
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}).on('click', '.ins-search-item', function () {
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gotoLink($(this));
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}).on('click', '.ins-close', function () {
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$main.removeClass('show');
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}).on('keydown', function (e) {
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if (!$main.hasClass('show')) return;
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switch (e.keyCode) {
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case 27: // ESC
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$main.removeClass('show'); break;
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case 38: // UP
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selectItemByDiff(-1); break;
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case 40: // DOWN
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selectItemByDiff(1); break;
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case 13: //ENTER
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gotoLink($container.find('.ins-selectable.active').eq(0)); break;
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}
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});
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})(jQuery, window.INSIGHT_CONFIG); |