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/**
* 增强搜索功能
* 支持搜索历史、自动建议和智能搜索
*/
class EnhancedSearch {
constructor() {
this.searchHistoryKey = 'search-history';
this.maxHistoryItems = 10;
this.searchHistory = this.loadSearchHistory();
this.suggestionsCache = {};
this.searchData = [];
this.init();
}
/**
* 初始化
*/
init() {
this.loadSearchData();
this.setupSearchUI();
this.setupKeyboardShortcuts();
}
/**
* 加载搜索数据
*/
async loadSearchData() {
try {
// 从 JSON 数据加载
const response = await fetch('./data/search-index.json');
if (response.ok) {
this.searchData = await response.json();
console.log(`加载了 ${this.searchData.length} 条搜索数据`);
} else {
// 如果没有搜索索引，使用导航数据
const navResponse = await fetch('./data/nav.json');
const navData = await navResponse.json();
this.searchData = this.extractSearchData(navData);
console.log(`从导航数据提取了 ${this.searchData.length} 条搜索数据`);
}
} catch (error) {
console.error('加载搜索数据失败:', error);
}
}
/**
* 从导航数据提取搜索数据
*/
extractSearchData(navData) {
const results = [];
if (navData.categories) {
navData.categories.forEach((category) => {
if (category.links) {
category.links.forEach((link) => {
results.push({
title: link.name,
url: link.url,
category: category.name,
description: link.description || `来自 ${category.name}`,
keywords: [link.name, category.name].join(' '),
type: 'link',
});
});
}
});
}
return results;
}
/**
* 加载搜索历史
*/
loadSearchHistory() {
try {
const history = localStorage.getItem(this.searchHistoryKey);
return history ? JSON.parse(history) : [];
} catch (error) {
console.error('加载搜索历史失败:', error);
return [];
}
}
/**
* 保存搜索历史
*/
saveSearchHistory() {
try {
localStorage.setItem(this.searchHistoryKey, JSON.stringify(this.searchHistory));
} catch (error) {
console.error('保存搜索历史失败:', error);
}
}
/**
* 添加搜索历史
*/
addSearchHistory(query) {
const trimmedQuery = query.trim();
if (!trimmedQuery) return;
// 移除重复项
this.searchHistory = this.searchHistory.filter((item) => item !== trimmedQuery);
// 添加到开头
this.searchHistory.unshift(trimmedQuery);
// 限制数量
if (this.searchHistory.length > this.maxHistoryItems) {
this.searchHistory = this.searchHistory.slice(0, this.maxHistoryItems);
}
this.saveSearchHistory();
}
/**
* 清除搜索历史
*/
clearSearchHistory() {
this.searchHistory = [];
this.saveSearchHistory();
}
/**
* 设置搜索 UI
*/
setupSearchUI() {
// 查找或创建搜索框
const searchInput =
document.getElementById('search-input') || document.querySelector('.search-input');
if (searchInput) {
this.setupSearchInput(searchInput);
}
// 创建搜索建议容器
this.createSuggestionsContainer();
}
/**
* 设置搜索输入框
*/
setupSearchInput(input) {
this.searchInput = input;
// 输入事件
input.addEventListener('input', (e) => {
this.handleInput(e.target.value);
});
// 焦点事件
input.addEventListener('focus', () => {
this.showSuggestions();
});
// 失去焦点事件（延迟隐藏）
input.addEventListener('blur', () => {
setTimeout(() => this.hideSuggestions(), 200);
});
// 键盘事件
input.addEventListener('keydown', (e) => {
this.handleKeydown(e);
});
}
/**
* 创建建议容器
*/
createSuggestionsContainer() {
const container = document.createElement('div');
container.className = 'search-suggestions-container';
container.id = 'search-suggestions';
document.body.appendChild(container);
this.suggestionsContainer = container;
}
/**
* 处理输入
*/
handleInput(value) {
if (value.trim()) {
this.showSuggestions(value);
} else {
this.showSuggestions();
}
}
/**
* 显示建议
*/
showSuggestions(query = '') {
if (!this.suggestionsContainer) return;
let suggestionsHTML = '';
// 搜索建议
if (query.trim()) {
const suggestions = this.getSuggestions(query);
if (suggestions.length > 0) {
suggestionsHTML += `
<div class="suggestions-section">
<div class="suggestions-header">搜索建议</div>
<div class="suggestions-list">
${suggestions.map((item) => this.renderSuggestionItem(item)).join('')}
</div>
</div>
`;
}
}
// 搜索历史
if (this.searchHistory.length > 0 && !query.trim()) {
suggestionsHTML += `
<div class="suggestions-section">
<div class="suggestions-header">
<span>搜索历史</span>
<button class="clear-history-btn" onclick="enhancedSearch.clearSearchHistory()">
<i class="fa fa-trash-o"></i> 清除
</button>
</div>
<div class="suggestions-list history-list">
${this.searchHistory.map((item) => this.renderHistoryItem(item)).join('')}
</div>
</div>
`;
}
// 热门搜索
if (!query.trim()) {
const popularSearches = this.getPopularSearches();
if (popularSearches.length > 0) {
suggestionsHTML += `
<div class="suggestions-section">
<div class="suggestions-header">热门搜索</div>
<div class="suggestions-list popular-list">
${popularSearches.map((item) => this.renderPopularItem(item)).join('')}
</div>
</div>
`;
}
}
this.suggestionsContainer.innerHTML = suggestionsHTML;
this.suggestionsContainer.style.display = 'block';
}
/**
* 隐藏建议
*/
hideSuggestions() {
if (this.suggestionsContainer) {
this.suggestionsContainer.style.display = 'none';
}
}
/**
* 获取搜索建议
*/
getSuggestions(query) {
const lowerQuery = query.toLowerCase();
return this.searchData
.filter(
(item) =>
item.title.toLowerCase().includes(lowerQuery) ||
(item.description && item.description.toLowerCase().includes(lowerQuery)) ||
(item.keywords && item.keywords.toLowerCase().includes(lowerQuery))
)
.slice(0, 5);
}
/**
* 获取热门搜索
*/
getPopularSearches() {
return [
{ title: 'Python', url: '#' },
{ title: 'JavaScript', url: '#' },
{ title: 'React', url: '#' },
{ title: 'Vue.js', url: '#' },
{ title: 'Docker', url: '#' },
];
}
/**
* 渲染建议项
*/
renderSuggestionItem(item) {
return `
<a href="${item.url}" class="suggestion-item" onclick="enhancedSearch.performSearch('${item.title}')">
<div class="suggestion-icon">
<i class="fa fa-${item.type === 'link' ? 'link' : 'search'}"></i>
</div>
<div class="suggestion-content">
<div class="suggestion-title">${this.highlightMatch(item.title)}</div>
<div class="suggestion-description">${item.description || ''}</div>
</div>
</a>
`;
}
/**
* 渲染历史项
*/
renderHistoryItem(query) {
return `
<div class="suggestion-item history-item" onclick="enhancedSearch.performSearch('${query}')">
<div class="suggestion-icon">
<i class="fa fa-clock-o"></i>
</div>
<div class="suggestion-content">
<div class="suggestion-title">${query}</div>
</div>
</div>
`;
}
/**
* 渲染热门项
*/
renderPopularItem(item) {
return `
<a href="${item.url}" class="suggestion-item popular-item">
<div class="suggestion-icon">
<i class="fa fa-fire"></i>
</div>
<div class="suggestion-content">
<div class="suggestion-title">${item.title}</div>
</div>
</a>
`;
}
/**
* 高亮匹配文本
*/
highlightMatch(text, query) {
if (!this.searchInput) return text;
const queryText = this.searchInput.value.trim();
if (!queryText) return text;
const regex = new RegExp(`(${queryText})`, 'gi');
return text.replace(regex, '<mark>$1</mark>');
}
/**
* 执行搜索
*/
performSearch(query) {
if (!query) return;
// 添加到搜索历史
this.addSearchHistory(query);
// 更新搜索框
if (this.searchInput) {
this.searchInput.value = query;
}
// 隐藏建议
this.hideSuggestions();
// 执行实际搜索
this.executeSearch(query);
}
/**
* 执行搜索
*/
executeSearch(query) {
// 调用原有的搜索功能
if (window.performSearch) {
window.performSearch(query);
} else {
// 默认搜索行为
const results = this.searchData.filter(
(item) =>
item.title.toLowerCase().includes(query.toLowerCase()) ||
(item.description &&
item.description.toLowerCase().includes(query.toLowerCase()))
);
console.log(`搜索 "${query}" 找到 ${results.length} 个结果`);
this.displaySearchResults(results);
}
}
/**
* 显示搜索结果
*/
displaySearchResults(results) {
const resultsContainer =
document.getElementById('search-results') || document.querySelector('.search-results');
if (resultsContainer) {
if (results.length === 0) {
resultsContainer.innerHTML = '<div class="no-results">未找到相关结果</div>';
} else {
resultsContainer.innerHTML = `
<div class="results-count">找到 ${results.length} 个结果</div>
<div class="results-list">
${results
.map(
(item) => `
<a href="${item.url}" class="result-item">
<div class="result-title">${item.title}</div>
<div class="result-description">${item.description || ''}</div>
<div class="result-category">${item.category || ''}</div>
</a>
`
)
.join('')}
</div>
`;
}
}
}
/**
* 处理键盘事件
*/
handleKeydown(e) {
const suggestions = this.suggestionsContainer?.querySelectorAll('.suggestion-item');
if (!suggestions || suggestions.length === 0) return;
if (e.key === 'ArrowDown') {
e.preventDefault();
// 移动到下一个建议
} else if (e.key === 'ArrowUp') {
e.preventDefault();
// 移动到上一个建议
} else if (e.key === 'Enter') {
e.preventDefault();
// 执行搜索
this.performSearch(this.searchInput.value);
} else if (e.key === 'Escape') {
// 隐藏建议
this.hideSuggestions();
}
}
/**
* 设置键盘快捷键
*/
setupKeyboardShortcuts() {
document.addEventListener('keydown', (e) => {
// Cmd/Ctrl + K 打开搜索
if ((e.metaKey || e.ctrlKey) && e.key === 'k') {
e.preventDefault();
if (this.searchInput) {
this.searchInput.focus();
this.showSuggestions();
}
}
// Escape 关闭搜索
if (e.key === 'Escape' && this.searchInput === document.activeElement) {
this.searchInput.blur();
this.hideSuggestions();
}
});
}
/**
* 获取搜索统计
*/
getSearchStats() {
return {
totalSearches: this.searchHistory.length,
recentSearches: this.searchHistory.slice(0, 5),
dataCount: this.searchData.length,
};
}
}
// 创建全局实例
const enhancedSearch = new EnhancedSearch();
// 导出供其他模块使用
if (typeof module !== 'undefined' && module.exports) {
module.exports = EnhancedSearch;
}
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