hugo-book-theme/assets/search.js

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'use strict';
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{{ $searchDataFile := printf "%s.search-data.json" .Language.Lang }}
{{ $searchData := resources.Get "search-data.json" | resources.ExecuteAsTemplate $searchDataFile . | resources.Minify | resources.Fingerprint }}
{{ $searchConfig := i18n "bookSearchConfig" | default "{}" }}
(function () {
const searchDataURL = '{{ $searchData.RelPermalink }}';
const indexConfig = Object.assign({{ $searchConfig }}, {
doc: {
id: 'id',
field: ['title', 'content'],
store: ['title', 'href', 'section']
}
});
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const input = document.querySelector('#book-search-input');
const results = document.querySelector('#book-search-results');
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if (!input) {
return
}
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input.addEventListener('focus', init);
input.addEventListener('keyup', search);
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document.addEventListener('keypress', focusSearchFieldOnKeyPress);
/**
* @param {Event} event
*/
function focusSearchFieldOnKeyPress(event) {
if (event.target.value !== undefined) {
return;
}
if (input === document.activeElement) {
return;
}
const characterPressed = String.fromCharCode(event.charCode);
if (!isHotkey(characterPressed)) {
return;
}
input.focus();
event.preventDefault();
}
/**
* @param {String} character
* @returns {Boolean}
*/
function isHotkey(character) {
const dataHotkeys = input.getAttribute('data-hotkeys') || '';
return dataHotkeys.indexOf(character) >= 0;
}
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function init() {
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input.removeEventListener('focus', init); // init once
input.required = true;
fetch(searchDataURL)
.then(pages => pages.json())
.then(pages => {
window.bookSearchIndex = FlexSearch.create('balance', indexConfig);
window.bookSearchIndex.add(pages);
})
.then(() => input.required = false)
.then(search);
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}
function search() {
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while (results.firstChild) {
results.removeChild(results.firstChild);
}
if (!input.value) {
return;
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}
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const searchHits = window.bookSearchIndex.search(input.value, 10);
searchHits.forEach(function (page) {
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const li = element('<li><a href></a><span></span><small></small></li>');
const a = li.querySelector('a'), small = li.querySelector('small'),span = li.querySelector('span');
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a.href = page.href;
a.textContent = page.title;
small.textContent = page.section;
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// 使用 Promise+async 实现
async function asyncFn() {
let returnData = await getSomething(page.href)
return returnData
}
// 因为asyncFn()返回的是 Promise对象而不是直接返回值所以需要.then来获取值进行操作
asyncFn().then(content => {
// 去除html标签
content = content.replace(/(<([^>]+)>)/ig, '');
// 按换行符分割成数组
let contentArray = lengthCutting(content, 15);
console.log(contentArray)
contentArray.forEach(line => {
if (line.match(/^\s+$/) || line.match(/^[ ]+$/) || line.match(/^[ ]*$/) || line.match(/^\s*$/)) {
console.log(1+line);
return;
}
if (line.search(input.value) != -1 && span.textContent == '') {
console.log(2 + line);
span.textContent = line;
return;
}
})
if (span.textContent == '') {
contentArray.forEach(line => {
if (line.match(/^\s+$/) || line.match(/^[ ]+$/) || line.match(/^[ ]*$/) || line.match(/^\s*$/)) {
console.log(3 + line);
return;
}
input.value.split('').forEach(s => {
console.log(1111 + s)
console.log(2222 +line)
if (line.search(s) != -1 && span.textContent == '') {
console.log(4 + line);
span.textContent = line;
return;
}
})
})
}
console.log(888+span.textContent)
})
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results.appendChild(li);
});
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}
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function lengthCutting(str, num) {
let strArr = [];
for (let i = 0; i < str.length; i += num) strArr.push(str.slice(i, i + num));
return strArr;
}
// 封装数据请求方法(异步)
function getSomething(link) {
return new Promise(resolve => {
var xhr = new XMLHttpRequest();
xhr.open('GET', link, true);
xhr.send();
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
resolve(xhr.responseText);
}
}
})
}
/**
* @param {String} content
* @returns {Node}
*/
function element(content) {
const div = document.createElement('div');
div.innerHTML = content;
return div.firstChild;
}
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})();