forked from mrlan/EnglishPal
108 lines
5.2 KiB
JavaScript
108 lines
5.2 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").innerText; //将原来的.innerText改为.innerHtml，使用innerText会把原文章中所包含的<br>标签去除，导致处理后的文章内容失去了原来的格式
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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 = ""; //初始化allWords的值，避免进入判断后编译器认为allWords未初始化的问题
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if(dictionaryWords != null){//增加一个判断，检查生词本里面是否为空，如果为空，allWords只添加选中的单词
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allWords = pickedWords.value + " " + dictionaryWords.value;
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}
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else{
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allWords = pickedWords.value + " ";
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}
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const list = allWords.split(" ");//将所有的生词放入一个list中，用于后续处理
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for (let i = 0; i < list.length; ++i) {
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list[i] = list[i].replace(/(^\s*)|(\s*$)/g, ""); //消除单词两边的空字符
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list[i] = list[i].replace('|', "");
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list[i] = list[i].replace('?', "");
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if (list[i] !== "" && "<mark>".indexOf(list[i]) === -1 && "</mark>".indexOf(list[i]) === -1) {
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//将文章中所有出现该单词word的地方改为："<mark>" + word + "<mark>"。 正则表达式RegExp()中，"\\b"代表单词边界匹配。
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//修改代码
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let articleContent_fb = articleContent; //文章副本
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let count = 1000; //简单计数器，防止陷入死循环。
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while(articleContent_fb.toLowerCase().indexOf(list[i].toLowerCase()) !== -1 && list[i]!=""){
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//针对同一篇文章中可能存在相同单词的不同大小写问题，采用while循环判断副本中是否还存在匹配单词。
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count--;
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if(count <= 0)break; //TimeOut!
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//找到副本中和list[i]匹配的第一个单词(第一种匹配情况),并赋值给list[i]。
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list[i] = articleContent_fb.substr(articleContent_fb.toLowerCase().indexOf(list[i].toLowerCase()),list[i].length);
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articleContent_fb = articleContent_fb.replace(list[i],""); //删除副本中和list[i]匹配的单词
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articleContent = articleContent.replace(new RegExp("\\b"+list[i]+"\\b","g"),"<mark>" + list[i] + "</mark>");
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}
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}
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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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let articleContent = document.getElementById("article").innerText;//将原来的.innerText改为.innerHtml，原因同上
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let pickedWords = document.getElementById("selected-words");
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const dictionaryWords = document.getElementById("selected-words2");
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const list = pickedWords.value.split(" ");
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if (pickedWords != null) {
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for (let i = 0; i < list.length; ++i) {
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list[i] = list[i].replace(/(^\s*)|(\s*$)/g, "");
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if (list[i] !== "") { //原来判断的代码中，替换的内容为“list[i]”这个字符串，这明显是错误的，我们需要替换的是list[i]里的内容
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articleContent = articleContent.replace(new RegExp("<mark>"+list[i]+"</mark>", "g"), list[i]);
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}
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}
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}
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if (dictionaryWords != null) {
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let list2 = pickedWords.value.split(" ");
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for (let i = 0; i < list2.length; ++i) {
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list2 = dictionaryWords.value.split(" ");
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list2[i] = list2[i].replace(/(^\s*)|(\s*$)/g, "");
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if (list2[i] !== "") { //原来代码中，替换的内容为“list[i]”这个字符串，这明显是错误的，我们需要替换的是list[i]里的内容
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articleContent = articleContent.replace(new RegExp("<mark>"+list2[i]+"</mark>", "g"), list2[i]);
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}
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}
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}
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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();
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