forked from mrlan/EnglishPal
79 lines
3.7 KiB
JavaScript
79 lines
3.7 KiB
JavaScript
let isHighlight = true;
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function cancelBtnHandler() {
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cancelHighlighting();
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document.getElementById("text-content").removeEventListener("click", fillInWord, false);
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document.getElementById("text-content").removeEventListener("touchstart", fillInWord, false);
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document.getElementById("text-content").addEventListener("click", fillInWord2, false);
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document.getElementById("text-content").addEventListener("touchstart", fillInWord2, false);
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}
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function showBtnHandler() {
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document.getElementById("text-content").removeEventListener("click", fillInWord2, false);
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document.getElementById("text-content").removeEventListener("touchstart", fillInWord2, false);
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document.getElementById("text-content").addEventListener("click", fillInWord, false);
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document.getElementById("text-content").addEventListener("touchstart", fillInWord, false);
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highLight();
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}
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function getWord() {
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return window.getSelection ? window.getSelection() : document.selection.createRange().text;
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}
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function highLight() {
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if (!isHighlight) return;
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let articleContent = document.getElementById("article").innerHTML; // 相比innerText，innerHTML保留HTML标签，来保持文章原先的格式，且适配不同的浏览器。
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let pickedWords = document.getElementById("selected-words"); // words picked to the text area
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let dictionaryWords = document.getElementById("selected-words2"); // words appearing in the user's new words list
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let allWords = dictionaryWords === null ? pickedWords.value + " " : pickedWords.value + " " + dictionaryWords.value;
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const list = allWords.split(" "); // 将所有的生词放入一个list中。
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let totalSet = new Set(); // 通过集合存储所有单词，通过判断重复单词，以及最后只遍历一次的方法，提高运行效率。
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for (let i = 0; i < list.length; ++i) {
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list[i] = list[i].replace(/(^\W*)|(\W*$)/g, ""); // 消除单词两边的非单词字符。
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if (list[i] != "" && !totalSet.has(list[i])) {
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// 返回所有匹配单词的集合, 正则表达式RegExp()中, "\b"匹配一个单词的边界, g 表示全局匹配, i 表示对大小写不敏感。
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let matches = new Set(articleContent.match(new RegExp("\\b" + list[i] + "\\b", "gi")));
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if (matches.has("mark")) {
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// 优先处理单词为 "mark" 的情况，防止和标签<mark>产生冲突。
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totalSet = new Set(["mark", ...totalSet]);
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}
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totalSet = new Set([...totalSet, ...matches]);
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}
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}
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// 删除所有的mark标签,防止标签发生嵌套
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articleContent = articleContent.replace(/<(mark)[^>]*>/gi, "");
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articleContent = articleContent.replace(/<(\/mark)[^>]*>/gi, "");
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// 将文章中所有出现该单词word的地方改为："<mark>" + word + "<mark>"。
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for (let word of totalSet) {
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articleContent = articleContent.replace(new RegExp("\\b" + word + "\\b", "g"), "<mark>" + word + "</mark>");
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}
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document.getElementById("article").innerHTML = articleContent;
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}
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function cancelHighlighting() {
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// 通过innerHTML获取文章后，去掉<mark>标签即可实现取消高亮的功能，不需要遍历单词逐个修改。
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let articleContent = document.getElementById("article").innerHTML;
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articleContent = articleContent.replace(/<(mark)[^>]*>/gi, "");
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articleContent = articleContent.replace(/<(\/mark)[^>]*>/gi, "");
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document.getElementById("article").innerHTML = articleContent;
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}
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function fillInWord() {
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highLight();
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}
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function fillInWord2() {
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cancelHighlighting();
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}
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function toggleHighlighting() {
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if (isHighlight) {
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isHighlight = false;
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cancelHighlighting();
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} else {
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isHighlight = true;
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highLight();
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}
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}
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showBtnHandler(); |