jQuery如何实现高亮显示网页关键词？
本文实例讲述了jQuery实现高亮显示网页关键词的方法。分享给大家供大家参考。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('span');
spannode.className = 'highlight';
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() {
$('#text-search').bind('keyup change', function(ev) {
// pull in the new value
var searchTerm = $(this).val();
// remove any old highlighted terms
$('body').removeHighlight();
// disable highlighting if empty
if ( searchTerm ) {
// highlight the new term
$('body').highlight( searchTerm );
}
});
});
</script>
</body>
</html>
希望本文所述对大家的jquery程序设计有所帮助。
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