分布式调度框架。
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require([
'gitbook',
'jquery'
], function(gitbook, $) {
var MAX_RESULTS = 15;
var MAX_DESCRIPTION_SIZE = 500;
var usePushState = (typeof history.pushState !== 'undefined');
// DOM Elements
var $body = $('body');
var $bookSearchResults;
var $searchInput;
var $searchList;
var $searchTitle;
var $searchResultsCount;
var $searchQuery;
// Throttle search
function throttle(fn, wait) {
var timeout;
return function() {
var ctx = this, args = arguments;
if (!timeout) {
timeout = setTimeout(function() {
timeout = null;
fn.apply(ctx, args);
}, wait);
}
};
}
function displayResults(res) {
$bookSearchResults.addClass('open');
var noResults = res.count == 0;
$bookSearchResults.toggleClass('no-results', noResults);
// Clear old results
$searchList.empty();
// Display title for research
$searchResultsCount.text(res.count);
$searchQuery.text(res.query);
// Create an <li> element for each result
res.results.forEach(function(res) {
var $li = $('<li>', {
'class': 'search-results-item'
});
var $title = $('<h3>');
var $link = $('<a>', {
'href': gitbook.state.basePath + '/' + res.url,
'text': res.title
});
var content = res.body.trim();
if (content.length > MAX_DESCRIPTION_SIZE) {
content = content.slice(0, MAX_DESCRIPTION_SIZE).trim()+'...';
}
var $content = $('<p>').html(content);
$link.appendTo($title);
$title.appendTo($li);
$content.appendTo($li);
$li.appendTo($searchList);
});
}
function launchSearch(q) {
// Add class for loading
$body.addClass('with-search');
$body.addClass('search-loading');
// Launch search query
throttle(gitbook.search.query(q, 0, MAX_RESULTS)
.then(function(results) {
displayResults(results);
})
.always(function() {
$body.removeClass('search-loading');
}), 1000);
}
function closeSearch() {
$body.removeClass('with-search');
$bookSearchResults.removeClass('open');
}
function launchSearchFromQueryString() {
var q = getParameterByName('q');
if (q && q.length > 0) {
// Update search input
$searchInput.val(q);
// Launch search
launchSearch(q);
}
}
function bindSearch() {
// Bind DOM
$searchInput = $('#book-search-input input');
$bookSearchResults = $('#book-search-results');
$searchList = $bookSearchResults.find('.search-results-list');
$searchTitle = $bookSearchResults.find('.search-results-title');
$searchResultsCount = $searchTitle.find('.search-results-count');
$searchQuery = $searchTitle.find('.search-query');
// Launch query based on input content
function handleUpdate() {
var q = $searchInput.val();
if (q.length == 0) {
closeSearch();
}
else {
launchSearch(q);
}
}
// Detect true content change in search input
// Workaround for IE < 9
var propertyChangeUnbound = false;
$searchInput.on('propertychange', function(e) {
if (e.originalEvent.propertyName == 'value') {
handleUpdate();
}
});
// HTML5 (IE9 & others)
$searchInput.on('input', function(e) {
// Unbind propertychange event for IE9+
if (!propertyChangeUnbound) {
$(this).unbind('propertychange');
propertyChangeUnbound = true;
}
handleUpdate();
});
// Push to history on blur
$searchInput.on('blur', function(e) {
// Update history state
if (usePushState) {
var uri = updateQueryString('q', $(this).val());
history.pushState({ path: uri }, null, uri);
}
});
}
gitbook.events.on('page.change', function() {
bindSearch();
closeSearch();
// Launch search based on query parameter
if (gitbook.search.isInitialized()) {
launchSearchFromQueryString();
}
});
gitbook.events.on('search.ready', function() {
bindSearch();
// Launch search from query param at start
launchSearchFromQueryString();
});
function getParameterByName(name) {
var url = window.location.href;
name = name.replace(/[\[\]]/g, '\\$&');
var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)', 'i'),
results = regex.exec(url);
if (!results) return null;
if (!results[2]) return '';
return decodeURIComponent(results[2].replace(/\+/g, ' '));
}
function updateQueryString(key, value) {
value = encodeURIComponent(value);
var url = window.location.href;
var re = new RegExp('([?&])' + key + '=.*?(&|#|$)(.*)', 'gi'),
hash;
if (re.test(url)) {
if (typeof value !== 'undefined' && value !== null)
return url.replace(re, '$1' + key + '=' + value + '$2$3');
else {
hash = url.split('#');
url = hash[0].replace(re, '$1$3').replace(/(&|\?)$/, '');
if (typeof hash[1] !== 'undefined' && hash[1] !== null)
url += '#' + hash[1];
return url;
}
}
else {
if (typeof value !== 'undefined' && value !== null) {
var separator = url.indexOf('?') !== -1 ? '&' : '?';
hash = url.split('#');
url = hash[0] + separator + key + '=' + value;
if (typeof hash[1] !== 'undefined' && hash[1] !== null)
url += '#' + hash[1];
return url;
}
else
return url;
}
}
});