針對全文透過JS來做重點標示

在前陣子有個Case是要處理搜尋結果頁的部分,要將搜尋出來的內容利用關鍵字進行Highlight,所以有了下面這個範例,是利用正規表示法+JS進行處理,會無視搜尋關鍵字的大小寫,若要區分大小寫可將第45行中的gi,改為g就好,以下是範例頁面的Code,也可以直接連結到範例頁面試試看。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Highlight Text Sample</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
    <style>
        .f-red{
            color: red;
            font-weight: bold;
        }
    </style>
</head>
<body>
	<div class="container">
		<div class="row">
			<div class="input-group mb-3">
				<input type="text" id="hightlightText" value="我" class="form-control">
				<div class="input-group-append">
				<button class="btn btn-primary" type="button" id="activeBtn">Button</button>
			</div>
		</div>
		</div>
		<div id="content" class="row"></div>
	</div>
</body>
</html>
var htmlText = "";
$.ajax({
    url: "highLightText.txt",
    async: false,
    success: function(response){
        htmlText = response;
    }
});
$("#content").html(htmlText);

var hightlightText = $("#hightlightText").val();
$.fn.highlight = function(what,spanClass) {
    return this.each(function(){
        var container = this,
            content = container.innerHTML,
            pattern = new RegExp('([<.]*)(' + what + ')([<.]*)','gi'),
            replaceWith = '$1<span ' + ( spanClass ? 'class="' + spanClass + '"' : '' ) + '">$2</span>$3',
            highlighted = content.replace(pattern,replaceWith);
        container.innerHTML = highlighted;
    });
}
$('#content').highlight(hightlightText,'f-red');

$("#activeBtn").click(function(){
    $("#content").html(htmlText);
    var hightlightText = $("#hightlightText").val();
    $('#content').highlight(hightlightText,'f-red');
});
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