javascript實現百度翻譯可折疊的分享按鈕列表

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編輯：JavaScript綜合知識

這篇文章主要介紹了javascript實現百度翻譯可折疊的分享按鈕列表的方法,需要的朋友可以參考下

自從開始學習前端後，平時看到浏覽器上的一些出彩的控件都想自己實現一下O(∩_∩)O，不知大家有沒有這個感覺。接下來就和大家分享一個，原控件來自百度翻譯右下方，大家仔細找找應該能找到，如圖所示：

javascript實現百度翻譯可折疊的分享按鈕列表

感覺蠻有意思的，實現起來也不復雜，比較適合練手。好吧，廢話不多說了，直接上代碼吧。

html代碼：

代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta charset = 'utf-8'/>
<title>zoom</title>
<link rel="stylesheet" type="text/css" href="zoom.css"/>
</head>
<body onload = "zoom()">
<div id = 'zoom'>
<span title = "分享....."></span>
<ul>
<li title="QQ空間" class="li1"></li>
<li title="騰訊微博" class="li2"></li>
<li title="新浪微博" class="li3"></li>
<li title="人人網" class="li4"></li>
<li title="百度" class="li5"></li>
<li title="豆瓣網" class="li6"></li>
<li title="搜狐" class="li7"></li>
<li title="開心網" class="li8"></li>
</ul>
</div>
<script type="text/javascript" src = "zoom.js"></script>
</body>
</html>

css代碼：

代碼如下:
*{
margin:0px;
padding:0px;
}
#zoom{
position: absolute;
top: 20px;
right: 200px;
border: 1px solid rgb(38,147,255);
height: 40px;
width: 40px;
}
#zoom > span{
display: inline-block;
position: absolute;
top: 0px;
bottom: 0px;
left: 0px;
width: 40px;
background-image: url(sprite.png);
background-repeat: no-repeat;
background-position: -5px -7px;
opacity: 0.8;
filter:Alpha(opacity=50);/*IE78*/
}
#zoom ul{
display: none;
position: absolute;
top: 0px;
bottom: 0px;
left: 50px;
list-style: none;
}
#zoom ul li{
display: inline-block;
*display: inline;/*IE7*/
*zoom:1;/*IE7*/
*margin-left: 5px;/*IE7*/
width: 16px;
height: 16px;
margin-top: 12px;
background-image: url(sprite.png);
background-repeat: no-repeat;
}
#zoom .li1{
background-position: -57px -20px;
}
#zoom .li2{
background-position: -77px -20px;
}
#zoom .li3{
background-position: -98px -20px;
}
#zoom .li4{
background-position: -119px -20px;
}
#zoom .li5{
background-position: -140px -20px;
}
#zoom .li6{
background-position: -161px -20px;
}
#zoom .li7{
background-position: -182px -20px;
}
#zoom .li8{
background-position: -203px -20px;
}

#zoom li:hover{
cursor: pointer;
opacity: 0.8;
filter:Alpha(opacity=50);/*IE78*/
}
#zoom span:hover{
cursor: pointer;
opacity: 1;
filter:Alpha(opacity=100);/*IE78*/
}

js代碼：

代碼如下:
var zoom = (function(){
var zoomDom = document.getElementById('zoom'),
state = {opened: false, onaction: false, length: 0},
showSpan,
ul;
if (zoomDom.firstElementChild) {
showSpan = zoomDom.firstElementChild;
ul = showSpan.nextElementSibling;
}else{ /*IE*/
showSpan = zoomDom.firstChild;
ul = showSpan.nextSibling;
}
/*兼容IE78的注冊事件方法*/
var addEvent = function(el, eventType, eventHandler){
if(el.addEventListener){
el.addEventListener(eventType, eventHandler,false);
} else if(el.attachEvent){
el.attachEvent('on' + eventType, eventHandler);/*IE78*/
}
};
/*兼容IE的阻止默認事件方法*/
var stopDefault = function(e){
if(e&&e.preventDefault){
e.preventDefault();
} else {
window.event.returnValue = false;/*IE*/
}
};
/*展開控件*/
var onOpen = function(){
if(state.length>250){
ul.style.display = 'inline-block';
state.onaction = false; state.opened = true;
}else{
if(!state.onaction){ state.onaction = true;}
state.length += 10;
zoomDom.style.width = state.length + 'px';
setTimeout(onOpen, 0)
}
};
/*關閉控件*/
var onCollapse = function(){
if(state.length<41){
state.onaction = false; state.opened = false;
}else{
if(!state.onaction){ state.onaction = true;}
state.length -= 10;
zoomDom.style.width = state.length + 'px';
setTimeout(onCollapse, 0);
}
};
/*點擊觸發按鈕的回調*/
var onSpanClick = function(e){
stopDefault(e);
if(!state.onaction){
if(!state.opened){
onOpen();
}else{
ul.style.display = 'none';
onCollapse();
}
}
};
return function(){
addEvent(showSpan, 'click', onSpanClick);
};
})();

下圖是css中用到的圖片（直接從百度翻譯上截的圖^_^）：