forked from mrlan/EnglishPal
95 lines
4.1 KiB
JavaScript
95 lines
4.1 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;
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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 = pickedWords.value + " " + dictionaryWords.value;
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const list = allWords.split(" ");
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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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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，"\\s"代表单词前后必须要有空格，以防止只对单词中的部分字符高亮的情况出现。
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let articleContent_fb = articleContent; //文章副本
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while(articleContent_fb.toLowerCase().indexOf(list[i]) !== -1){
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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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//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]),list[i].length);
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articleContent_fb = articleContent_fb.replace(new RegExp("\\s"+list[i]+"\\s","g"),""); //删除副本中和list[i]匹配的单词
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articleContent = articleContent.replace(new RegExp("\\s"+list[i]+"\\s", "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;
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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] !== "") {
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articleContent = articleContent.replace("<mark>" + list[i] + "</mark>", "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] !== "") {
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articleContent = articleContent.replace("<mark>" + list[i] + "</mark>", "list[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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