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锁定老帖子 主题:le阻止事件冒泡
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发表时间:2008-05-01
事件来源对象->上级对象->上上级对象->.....->body->document->window NS的事件传递是从上到下: window->document->body->....->事件来源对象实例源码如下: <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>event.cancelBubble</title> <style> <!-- * {font:menu} --> </style> </head> <body> <span onclick=alert("你好")>点我 <span>再点我</span></span><br><br> <span onclick=alert("你好")>点我 <span onclick=event.cancelBubble=true;>再点我</span></span> </body> </html> 实例2: <!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" lang="zh" xml:lang="zh"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <meta name="developer" content="Realazy" /> <title>Bubble in JavaScript DOM--JavaScript 的事件冒泡 demo </title> <style type="text/css" media="screen"> div * {display:block; margin:4px; padding:4px; border:1px solid white;} textarea {width:20em; height:2em;} </style> <script type="text/javascript"> //<![CDATA[ function init(){ var log = document.getElementsByTagName('textarea')[0]; var all = document.getElementsByTagName('div')[0].getElementsByTagName('*'); for (var i = 0, n = all.length; i < n; ++i){ all[i].onmouseover = function(e){ this.style.border = '1px solid red'; log.value = '鼠标现在进入的是: ' + this.nodeName; }; all[i].onmouseout = function(e){ this.style.border = '1px solid white'; }; } var all2 = document.getElementsByTagName('div')[1].getElementsByTagName('*'); for (var i = 0, n = all2.length; i < n; ++i){ all2[i].onmouseover = function(e){ this.style.border = '1px solid red'; if (e) //停止事件冒泡 e.stopPropagation(); else window.event.cancelBubble = true; log.value = '鼠标现在进入的是: ' + this.nodeName; }; all2[i].onmouseout = function(e){ this.style.border = '1px solid white';}; } } window.onload = init; //]]> </script> </head> <body> <h1>Bubble in JavaScript DOM</h1> <p>DOM树的结构是:</p> <pre><code> UL - LI - A - SPAN </code></pre> <div> <ul> <li><a href="#"><span>Bubbllllllllllllllle</span></a></li> <li><a href="#"><span>Bubbllllllllllllllle</span></a></li> </ul> </div> <textarea></textarea> <p>鼠标进入UL的任何一个子元素,如果不停止冒泡,我们从UL到SPAN都定义了鼠标悬停(<code>mouseover</code>)事件,这个事件会上升了UL,从而从鼠标所进入的元素到UL元素都会有红色的边。</p> <div> <ul> <li><a href="#"><span>Bubbllllllllllllllle</span></a></li> <li><a href="#"><span>Bubbllllllllllllllle</span></a></li> </ul> </div> <p>如果停止冒泡,事件不会上升,我们就可以获取精确的鼠标进入元素。</p> </body> 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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