6.4.3 HTML 事件
<script language = "javascript">
window.onload = function(){
alert("Page Loaded.")
}
</script>
6.6 伸缩的两级菜单
【例6.14】制作伸缩的两级菜单
<html>
<head>
<style type = "text/css">
#navigation>ul{
list-style-type:none;
margin:0px;
padding:0px;
}
#navigation>ul>li{
border-bottom:1px solid #ED9F9F;
}
#navigation>ul>li>a{
display:block;
padding:5px 5px 5px 0.5em;
text-decoration:none;
border-left:12px solid #711515;
border-right:2px solid #711515;
}
#navigation>ul>li>a:link,#navigation>ul>li>a:visited{
background-color:#c11136;
color:#FFFFFF;
}
#navigation>ul>li>a:hover{
background-color:#990020;
color:#FFFF00;
}
/*×Ӳ˵¥µÄCSSÑùʽ*/
#navigation ul li ul{
list-style-type:none;
margin:0px
padding:0px 0px 0px 0px;
}
#navigation ul li ul li{
border-top:1px solid#ED9F9F;
}
#navigation ul li ul li a{
display:block;
padding:3px 3px 3px 0.5em;
text-decoration:none;
border-left:28px solid #a71f1f;
border-right:1px solid #711515;
}
#navigation ul li ul li a:link,#navigation ul li ul li a:visited{
background-color:#e85070;
color:#FFFFFF;
}
#navigation ul li ul li a:hover{
background-color:#c2425d;
color:#FFFF00;
}
#navigation ul li ul.myHide{ /*Òþ²Ø×Ӳ˵¥*/
display:none;
}
#navigation ul li ul.myShow{ /*ÏÔʾ×Ӳ˵¥*/
display:block;
}
</style>
<script type = "text/javascript">
window.onload = function(){
var oUl = document.getElementById("listUL");
var aLi = oUl.childNodes; //子元素
var oA;
for(var i=0; i<aLi.length; i++)
{ //如果子元素为li，且这个li有子菜单ul
if(aLi[i].tagName =="LI"&&aLi[i].getElementsByTagName("ul").length){
oA = aLi[i].firstChild; //找到超链接
oA.onclick = change; //动态添加单击函数
}
}
}
function change(){
//通过父元素li，找到兄弟元素ul
var oSecondDiv = this.parentNode.getElementsByTagName("ul")[0];
//CSS 交替更换来实现显、隐
if(oSecondDiv.className=="myHide")
oSecondDiv.className = "myShow";
else
oSecondDiv.className = "myHide";
}
</script>
</head>
<body>
<div id = "navigation">
<ul id = "listUL">
<li><a href="#">Home</a></li>
<li><a href="#">News</a>
<ul class="myHide">
<li><a href="#">Lastest News</a></li>
<li><a href="#">All News</a></li>
</ul></li>
<li><a href = "#">Sports</a>
<ul class = "myShow">
<li><a href="#">Basketball</a></li>
<li><a href="#">Football</a></li>
<li><a href="#">Volleyball</a></li>
</ul></li>
<li><a href = "#">Weather</a>
<ul class = "myHide">
<li><a href="#">Today's Weather</a></li>
<li><a href="#">Forecast</a></li>
</ul></li>
<li><a href = "#">Contact Me</a></li>
</ul>
</div>
</body>
</html>
