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jQuery实现高亮显示网页关键词的方法

PHPz

发布： 2018-09-29 11:39:04

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这篇文章主要介绍了jQuery实现高亮显示网页关键词的方法，涉及jquery针对页面字符串的遍历与正则替换的相关技巧，非常具有实用价值，需要的朋友可以参考下，具体如下：

这是一款基于jquery实现的高亮显示网页上搜索关键词的代码，当你在文本框中输入的时候，如果下面的正文中包括你输入的内容，也就是关键字，那么这些关键字是会高亮显示的，被动态添加成黄色，看上去很醒目，就像百度快照显示关键词的样子。

运行效果如下图所示：

具体代码如下：

<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jquery文字高亮显示</title>
<style type="text/css">
.highlight {
  background-color: #fff34d;
  -moz-border-radius: 5px; /* FF1+ */
  -webkit-border-radius: 5px; /* Saf3-4 */
  border-radius: 5px; /* Opera 10.5, IE 9, Saf5, Chrome */
  -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7); /* FF3.5+ */
  -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7); /* Saf3.0+, Chrome */
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.7); /* Opera 10.5+, IE 9.0 */
}
.highlight {
  padding:1px 4px;
  margin:0 -4px;
}
</style>
</head>
<body>
Search: <input type="text" id="text-search" />
<p>This can include web design, web content development, client liaison, client-side/server-side scripting, web server and network security configuration, and e-commerce development. However, among web professionals, "web development" usually refers to the main non-design aspects of building web sites: writing markup and coding. Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, or social ntwork services.</p>
(Text from Wikipedia)
<script type="text/javascript" src="jquery-1.6.2.min.js"></script>
<script type="text/javascript">
jQuery.fn.highlight = function(pat) {
 function innerHighlight(node, pat) {
 var skip = 0;
 if (node.nodeType == 3) {
  var pos = node.data.toUpperCase().indexOf(pat);
  if (pos >= 0) {
  var spannode = document.createElement(&#39;span&#39;);
  spannode.className = &#39;highlight&#39;;
  var middlebit = node.splitText(pos);
  var endbit = middlebit.splitText(pat.length);
  var middleclone = middlebit.cloneNode(true);
  spannode.appendChild(middleclone);
  middlebit.parentNode.replaceChild(spannode, middlebit);
  skip = 1;
  }
 }
 else if (node.nodeType == 1 && node.childNodes && !/(script|style)/i.test(node.tagName)) {
  for (var i = 0; i < node.childNodes.length; ++i) {
  i += innerHighlight(node.childNodes[i], pat);
  }
 }
 return skip;
 }
 return this.each(function() {
 innerHighlight(this, pat.toUpperCase());
 });
};
jQuery.fn.removeHighlight = function() {
 function newNormalize(node) {
  for (var i = 0, children = node.childNodes, nodeCount = children.length; i < nodeCount; i++) {
    var child = children[i];
    if (child.nodeType == 1) {
      newNormalize(child);
      continue;
    }
    if (child.nodeType != 3) { continue; }
    var next = child.nextSibling;
    if (next == null || next.nodeType != 3) { continue; }
    var combined_text = child.nodeValue + next.nodeValue;
    new_node = node.ownerDocument.createTextNode(combined_text);
    node.insertBefore(new_node, child);
    node.removeChild(child);
    node.removeChild(next);
    i--;
    nodeCount--;
  }
 }
return this.find("span.highlight").each(function() {
  var thisParent = this.parentNode;
  thisParent.replaceChild(this.firstChild, this);
  newNormalize(thisParent);
 }).end();
};
</script>
<script type="text/javascript">
$(function() {
  $(&#39;#text-search&#39;).bind(&#39;keyup change&#39;, function(ev) {
    // pull in the new value
    var searchTerm = $(this).val();
    // remove any old highlighted terms
    $(&#39;body&#39;).removeHighlight();
    // disable highlighting if empty
    if ( searchTerm ) {
      // highlight the new term
      $(&#39;body&#39;).highlight( searchTerm );
    }
  });
});
</script>
</body>
</html>

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