js 关键词高亮(根据ID/tag高亮关键字)案例介绍

时间：2021-05-26

复制代码 代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>JS 关键词高亮</title>
<script type="text/javascript">
/*
* 参数说明:
* obj: 对象, 要进行高亮显示的html标签节点.
* hlWords: 字符串, 要进行高亮的关键词词, 使用 竖杠(|)或空格分隔多个词 .
* bgColor: 背景颜色，默认为红色.
*/
function MarkHighLight(obj, hlWords, bgColor) {
hlWords = AnalyzeHighLightWords(hlWords);
if (obj == null || hlWords.length == 0)
return;
if (bgColor == null || bgColor == "") {
bgColor = "red";
}
MarkHighLightCore(obj, hlWords);
//执行高亮标记的核心方法
function MarkHighLightCore(obj, keyWords) {
var re = new RegExp(keyWords, "i");
var style = ' style="background-color:' + bgColor + ';" '
for (var i = 0; i < obj.childNodes.length; i++) {
var childObj = obj.childNodes[i];
if (childObj.nodeType == 3) {
if (childObj.data.search(re) == -1) continue;
var reResult = new RegExp("(" + keyWords + ")", "gi");
var objResult = document.createElement("span");
objResult.innerHTML = childObj.data.replace(reResult, "<span" + style + ">$1</span>");
if (childObj.data == objResult.childNodes[0].innerHTML) continue;
obj.replaceChild(objResult, childObj);
} else if (childObj.nodeType == 1) {
MarkHighLightCore(childObj, keyWords);
}
}
}
//分析关键词
function AnalyzeHighLightWords(hlWords) {
if (hlWords == null) return "";
hlWords = hlWords.replace(/\s+/g, "|").replace(/\|+/g, "|");
hlWords = hlWords.replace(/(^\|*)|(\|*$)/g, "");
if (hlWords.length == 0) return "";
var wordsArr = hlWords.split("|");
if (wordsArr.length > 1) {
var resultArr = BubbleSort(wordsArr);
var result = "";
for (var i = 0; i < resultArr.length; i++) {
result = result + "|" + resultArr[i];
}
return result.replace(/(^\|*)|(\|*$)/g, "");
} else {
return hlWords;
}
}
//利用冒泡排序法把长的关键词放前面
function BubbleSort(arr) {
var temp, exchange;
for (var i = 0; i < arr.length; i++) {
exchange = false;
for (var j = arr.length - 2; j >= i; j--) {
if ((arr[j + 1].length) > (arr[j]).length) {
temp = arr[j + 1]; arr[j + 1] = arr[j]; arr[j] = temp;
exchange = true;
}
}
if (!exchange) break;
}
return arr;
}
}
//end
function search() {
var obj = document.getElementById("waiDiv");
var keyWord = document.getElementById("keyWord");
MarkHighLight(obj, keyWord.value, "Orange");
}
</script>
</head>
<body>
<div id="waiDiv">
<input type="text" id="keyWord" />
<input type="button" value="搜索" onclick="search()" /><br />
<br />
<div id="contentDiv">
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</div>
</div>
</body>
</html>

改进版
复制代码 代码如下:
function highlightWord(node, word) {
// Iterate into this nodes childNodes
if (node.hasChildNodes) {
var hi_cn;
for (hi_cn = 0; hi_cn < node.childNodes.length; hi_cn++) {
highlightWord(node.childNodes[hi_cn], word);
}
}
// And do this node itself
if (node.nodeType == 3) { // text node
tempNodeVal = node.nodeValue.toLowerCase();
tempWordVal = word.toLowerCase();
if (tempNodeVal.indexOf(tempWordVal) != -1) {
pn = node.parentNode;
if (pn.className != "highlight") {
// word has not already been highlighted!
nv = node.nodeValue;
ni = tempNodeVal.indexOf(tempWordVal);
// Create a load of replacement nodes
before = document.createTextNode(nv.substr(0, ni));
docWordVal = nv.substr(ni, word.length);
after = document.createTextNode(nv.substr(ni + word.length));
hiwordtext = document.createTextNode(docWordVal);
hiword = document.createElement("span");
hiword.className = "highlight";
hiword.appendChild(hiwordtext);
pn.insertBefore(before, node);
pn.insertBefore(hiword, node);
pn.insertBefore(after, node);
pn.removeChild(node);
}
}
}
}
//根据Tag名高亮关键字
function SearchHighlightTag(node, key) {
if (!document.createElement) return;
if (key.length === 0) return false;
var array = new Array();
array = key.split(" ");
var element = document.getElementsByTagName(node);
for (var i = 0; i < array.length; i++) {
for (var j = 0; j < element.length; j++) {
highlightWord(element[j], array[i]);
}
}
}
//根据ID高亮关键字
function SearchHighlightID(node, key) {
if (!document.createElement) return;
if (key.length === 0) return false;
var array = new Array();
array = key.split(" ");
var element = document.getElementById(node);
for (var i = 0; i < array.length; i++) {
for (var j = 0; j < element.length; j++) {
highlightWord(element, array[i]);
}
}
}

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