跪求js高手有100分赠送
js高手你好,我写了个菜单,功能是点击键盘的方向键-> 打开它的子菜单,点击键盘的方向键 <-关闭它的子菜单;我想实现 "向键-> "打开子菜单时子菜单能够自动获取焦点(我的菜单是text做的),并且点击ENTER时子菜单能够打开一个URL链接(弹出窗口).
我的代码如下,望高手指点改正:
<html>
<head>
<style type= "text/css ">
<!--
input {border:1px solid #fff; background:#fff; }
input {star : expression(
onmouseover=function(){this.style.backgroundColor= "#eee "},
onmouseout=function(){this.style.backgroundColor= "#fff "})}
.in40 {width:40px;}
.in80 {width:80px;}
.in120 {width:120px;}
.in200 {width:200px;}
-->
</style>
</head>
<body>
<script defer>
var obj=document.getElementsByTagName( "input ");
var urlpath = " ";
for(var i=0;i <obj.length;i++)
if(obj[i].input)
{
obj[i].focus();
break;
}
document.onkeydown=function()
{
try{
//alert(event.keyCode);
if(event.keyCode==13){
//alert( "现在访问URL ");
window.open();
}
//按esc键退出
if(event.keycode == 27)
window.closed();
if(event.keyCode==40){
event.srcElement.nextSibling.nextSibling.focus();
showNone();
}
else if(event.keyCode==38){
event.srcElement.previousSibling.previousSibling.focus();
showNone();
}
else if(event.keyCode==37){
var xxx = event.srcElement;//event.srcElement就是指向触发事件的元素，他是什么就有什么的属性;srcElement 是事件初始目标的html元素对象引用,因为事件通过元素容器层次冒泡,可以在任一层进行处理,所以由一个属性指向产生初始事件的元素是很有帮助的.有了元素的引用,就可以读/写改元素的属性,并调用他的任何方法.
if(xxx.id == "bb "){
bbb.style.display = "none ";
}else if(xxx.id == "cc "){
ccc.style.display = "none ";
}else if(xxx.id == "dd "){
ddd.style.display = "none ";
}
}
else if(event.keyCode==39){
var xxx = event.srcElement;
if(xxx.id == "bb "){
bbb.style.display = "block ";
}else if(xxx.id == "cc "){
ccc.style.display = "block ";
}else if(xxx.id == "dd "){
ddd.style.display = "block ";
}
}
}catch(e){}
}
function url(obj){
urlpath =obj.value;
//window.location.href=obj;
//alert(obj.value);
}
function showNone(){
bbb.style.display = "none ";
ccc.style.display = "none ";
ddd.style.display = "none ";
}
</script>
<table>
<tr> <td>
<div id= "aaa ">
<input type=text class= "in200 " value= "http://www.google.com " onfocus= "this.select();url(this) " size= "40 " id= "bb "> <br/>
<input type=text class= "in80 " value= "菜单2 " onfocus= "this.select();url(this) " id= "cc "> <br/>
<input type=text class= "in80 " value= "菜单3 " onfocus= "this.select();url(this) " id= "dd ">
</div>
</td>
<td>
<div style= "display:none " id= "bbb "> <input type=text class= "in80 " value= "菜单4 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单5 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单6 " onfocus=this.select() > </div>
<div style= "display:none " id= "ccc ">
<input type=text class= "in80 " value= "菜单7 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单8 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单9 " onfocus=this.select() > </div>
<div style= "display:none " id= "ddd ">
<input type=text class= "in80 " value= "菜单10 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单11 " onfocus=this.select() > <br/>
<input type=text class= "in80 " value= "菜单12 " onfocus=this.select() > </div>
</td> </tr>
</table>
</body>
</html>
[解决办法]
else if(event.keyCode==39){
var xxx = event.srcElement;
if(xxx.id == "bb "){
bbb.style.display = "block ";
}else if(xxx.id == "cc "){
ccc.style.display = "block ";
}else if(xxx.id == "dd "){
ddd.style.display = "block ";
}
}
把这个改成（还有你的选择一个后，再选下一个，之前那个也没消失，也帮你改了下，你的代码这样写有点不好）：
else if(event.keyCode==39){
var xxx = event.srcElement;
if(xxx.id == "bb "){
ccc.style.display = "none ";
ddd.style.display = "none ";
bbb.style.display = "block ";
document.getElementById( "bbb ").getElementsByTagName( "input ")[0].select();
}else if(xxx.id == "cc "){
ddd.style.display = "none ";
bbb.style.display = "none ";
ccc.style.display = "block ";
document.getElementById( "ccc ").getElementsByTagName( "input ")[0].select();
}else if(xxx.id == "dd "){
ccc.style.display = "none ";
bbb.style.display = "none ";
ddd.style.display = "block ";
document.getElementById( "ddd ").getElementsByTagName( "input ")[0].select();
}
}
[解决办法]
else if(event.keyCode==39){
var xxx = event.srcElement;
if(xxx.id == "bb "){
bbb.style.display = "block ";
bbb.childNodes[0].focus();
}else if(xxx.id == "cc "){
ccc.style.display = "block ";
ccc.childNodes[0].focus();
}else if(xxx.id == "dd "){
ddd.style.display = "block ";
ccc.childNodes[0].focus();
}
}
这样子菜单能自动获取焦点
