这里提供的解决方案非常糟糕。
- 您不能使用正则表达式，因为这样会在 html 标记中搜索/突出显示。
- 您不能使用正则表达式，因为它不适用于 UTF*（任何非拉丁/英文字符）。
- 你不能只做一个innerHTML.replace，因为当字符有一个特殊的HTML符号时，这不起作用，例如。
& for &, < for > for >, ä for ä, ö for ö ü for ü ß for ß，等等。
你需要做什么：
遍历 HTML 文档，查找所有文本节点，获取 textContent，使用 indexOf 获取突出显示文本的位置（如果不区分大小写，则使用可选的 toLowerCase），附加所有内容在indexof 和textNode 之前，将匹配的文本附加一个突出显示范围，并在文本节点的其余部分重复（突出显示字符串可能在textContent 字符串中出现多次）。
下面是代码：
var InstantSearch = {
"highlight": function (container, highlightText)
{
var internalHighlighter = function (options)
{
var id = {
container: "container",
tokens: "tokens",
all: "all",
token: "token",
className: "className",
sensitiveSearch: "sensitiveSearch"
},
tokens = options[id.tokens],
allClassName = options[id.all][id.className],
allSensitiveSearch = options[id.all][id.sensitiveSearch];
function checkAndReplace(node, tokenArr, classNameAll, sensitiveSearchAll)
{
var nodeVal = node.nodeValue, parentNode = node.parentNode,
i, j, curToken, myToken, myClassName, mySensitiveSearch,
finalClassName, finalSensitiveSearch,
foundIndex, begin, matched, end,
textNode, span, isFirst;
for (i = 0, j = tokenArr.length; i < j; i++)
{
curToken = tokenArr[i];
myToken = curToken[id.token];
myClassName = curToken[id.className];
mySensitiveSearch = curToken[id.sensitiveSearch];
finalClassName = (classNameAll ? myClassName + " " + classNameAll : myClassName);
finalSensitiveSearch = (typeof sensitiveSearchAll !== "undefined" ? sensitiveSearchAll : mySensitiveSearch);
isFirst = true;
while (true)
{
if (finalSensitiveSearch)
foundIndex = nodeVal.indexOf(myToken);
else
foundIndex = nodeVal.toLowerCase().indexOf(myToken.toLowerCase());
if (foundIndex < 0)
{
if (isFirst)
break;
if (nodeVal)
{
textNode = document.createTextNode(nodeVal);
parentNode.insertBefore(textNode, node);
} // End if (nodeVal)
parentNode.removeChild(node);
break;
} // End if (foundIndex < 0)
isFirst = false;
begin = nodeVal.substring(0, foundIndex);
matched = nodeVal.substr(foundIndex, myToken.length);
if (begin)
{
textNode = document.createTextNode(begin);
parentNode.insertBefore(textNode, node);
} // End if (begin)
span = document.createElement("span");
span.className += finalClassName;
span.appendChild(document.createTextNode(matched));
parentNode.insertBefore(span, node);
nodeVal = nodeVal.substring(foundIndex + myToken.length);
} // Whend
} // Next i
}; // End Function checkAndReplace
function iterator(p)
{
if (p === null) return;
var children = Array.prototype.slice.call(p.childNodes), i, cur;
if (children.length)
{
for (i = 0; i < children.length; i++)
{
cur = children[i];
if (cur.nodeType === 3)
{
checkAndReplace(cur, tokens, allClassName, allSensitiveSearch);
}
else if (cur.nodeType === 1)
{
iterator(cur);
}
}
}
}; // End Function iterator
iterator(options[id.container]);
} // End Function highlighter
;
internalHighlighter(
{
container: container
, all:
{
className: "highlighter"
}
, tokens: [
{
token: highlightText
, className: "highlight"
, sensitiveSearch: false
}
]
}
); // End Call internalHighlighter
} // End Function highlight
};
那么你可以这样使用它：
function TestTextHighlighting(highlightText)
{
var container = document.getElementById("testDocument");
InstantSearch.highlight(container, highlightText);
}
这是一个 HTML 文档示例
<!DOCTYPE html>
<html>
<head>
<title>Example of Text Highlight</title>
<style type="text/css" media="screen">
.highlight{ background: #D3E18A;}
.light{ background-color: yellow;}
</style>
</head>
<body>
<div id="testDocument">
This is a test
<span> This is another test</span>
äöüÄÖÜäöüÄÖÜ
<span>Test123äöüÄÖÜ</span>
</div>
</body>
</html>
顺便说一句，如果你在数据库中搜索LIKE，
例如WHERE textField LIKE CONCAT('%', @query, '%') [你不应该这样做，你应该使用全文搜索或 Lucene]，然后你可以用 \ 转义每个字符并添加 SQL-escape-statement，这样你会找到 LIKE- 的特殊字符表达式。
例如
WHERE textField LIKE CONCAT('%', @query, '%') ESCAPE '\'
而@query 的值不是'%completed%' 而是'%\c\o\m\p\l\e\t\e\d%'
（经过测试，可与 SQL-Server 和 PostgreSQL 以及所有其他支持 ESCAPE 的 RDBMS 系统一起使用）
修改后的打字稿版本：
namespace SearchTools
{
export interface IToken
{
token: string;
className: string;
sensitiveSearch: boolean;
}
export class InstantSearch
{
protected m_container: Node;
protected m_defaultClassName: string;
protected m_defaultCaseSensitivity: boolean;
protected m_highlightTokens: IToken[];
constructor(container: Node, tokens: IToken[], defaultClassName?: string, defaultCaseSensitivity?: boolean)
{
this.iterator = this.iterator.bind(this);
this.checkAndReplace = this.checkAndReplace.bind(this);
this.highlight = this.highlight.bind(this);
this.highlightNode = this.highlightNode.bind(this);
this.m_container = container;
this.m_defaultClassName = defaultClassName || "highlight";
this.m_defaultCaseSensitivity = defaultCaseSensitivity || false;
this.m_highlightTokens = tokens || [{
token: "test",
className: this.m_defaultClassName,
sensitiveSearch: this.m_defaultCaseSensitivity
}];
}
protected checkAndReplace(node: Node)
{
let nodeVal: string = node.nodeValue;
let parentNode: Node = node.parentNode;
let textNode: Text = null;
for (let i = 0, j = this.m_highlightTokens.length; i < j; i++)
{
let curToken: IToken = this.m_highlightTokens[i];
let textToHighlight: string = curToken.token;
let highlightClassName: string = curToken.className || this.m_defaultClassName;
let caseSensitive: boolean = curToken.sensitiveSearch || this.m_defaultCaseSensitivity;
let isFirst: boolean = true;
while (true)
{
let foundIndex: number = caseSensitive ?
nodeVal.indexOf(textToHighlight)
: nodeVal.toLowerCase().indexOf(textToHighlight.toLowerCase());
if (foundIndex < 0)
{
if (isFirst)
break;
if (nodeVal)
{
textNode = document.createTextNode(nodeVal);
parentNode.insertBefore(textNode, node);
} // End if (nodeVal)
parentNode.removeChild(node);
break;
} // End if (foundIndex < 0)
isFirst = false;
let begin: string = nodeVal.substring(0, foundIndex);
let matched: string = nodeVal.substr(foundIndex, textToHighlight.length);
if (begin)
{
textNode = document.createTextNode(begin);
parentNode.insertBefore(textNode, node);
} // End if (begin)
let span: HTMLSpanElement = document.createElement("span");
if (!span.classList.contains(highlightClassName))
span.classList.add(highlightClassName);
span.appendChild(document.createTextNode(matched));
parentNode.insertBefore(span, node);
nodeVal = nodeVal.substring(foundIndex + textToHighlight.length);
} // Whend
} // Next i
} // End Sub checkAndReplace
protected iterator(p: Node)
{
if (p == null)
return;
let children: Node[] = Array.prototype.slice.call(p.childNodes);
if (children.length)
{
for (let i = 0; i < children.length; i++)
{
let cur: Node = children[i];
// https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
if (cur.nodeType === Node.TEXT_NODE)
{
this.checkAndReplace(cur);
}
else if (cur.nodeType === Node.ELEMENT_NODE)
{
this.iterator(cur);
}
} // Next i
} // End if (children.length)
} // End Sub iterator
public highlightNode(n:Node)
{
this.iterator(n);
} // End Sub highlight
public highlight()
{
this.iterator(this.m_container);
} // End Sub highlight
} // End Class InstantSearch
} // End Namespace SearchTools
用法：
let searchText = document.getElementById("txtSearchText");
let searchContainer = document.body; // document.getElementById("someTable");
let highlighter = new SearchTools.InstantSearch(searchContainer, [
{
token: "this is the text to highlight" // searchText.value,
className: "highlight", // this is the individual highlight class
sensitiveSearch: false
}
]);
// highlighter.highlight(); // this would highlight in the entire table
// foreach tr - for each td2
highlighter.highlightNode(td2); // this highlights in the second column of table