<!DOCTYPE >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript">
var childCreate = false;
function Offset(e) {
//取标签的绝对位置
var t = e.offsetTop;
var l = e.offsetLeft;
var w = e.offsetWidth;
var h = e.offsetHeight - 2;
while ( e = e.offsetParent) {
t += e.offsetTop;
l += e.offsetLeft;
}
return {
top : t,
left : l,
width : w,
height : h
}
}
function loadselect(obj) {
//第一步：取得select所在的位置
var offset = Offset(obj);
//第二步：将真的select隐藏
obj.style.display = "none";
//第三步：虚拟一个div出来代替select
var iDiv = document.createElement("div");
iDiv.id = "selectof" + obj.name;
iDiv.style.position = "absolute";
iDiv.style.width = offset.width + "px";
iDiv.style.height = offset.height + "px";
iDiv.style.top = offset.top + "px";
iDiv.style.left = offset.left + "px";
iDiv.style.background = "url(http://www.zcool.com.cn/pic/png5/130/pixelicious_001.png) no-repeat right -6px";
iDiv.style.border = "1px solid #ccc";
iDiv.style.fontSize = "12px";
iDiv.style.lineHeight = offset.height + "px";
iDiv.style.textIndent = "4px";
document.body.appendChild(iDiv);
//第四步：将select中默认的选项显示出来
var tValue = obj.options[obj.selectedIndex].innerHTML;
iDiv.innerHTML = tValue;
//第五步：模拟鼠标点击
iDiv.onmouSEOver = function() {//鼠标移到
iDiv.style.background = "url('image/test.jpg') no-repeat right -6px";
}
iDiv.onmouseout = function() {//鼠标移走
iDiv.style.background = "url('image/test.jpg') no-repeat right -6px";
}
iDiv.onclick = function() {//鼠标点击
if (document.getElementById("selectchild" + obj.name)) {
//判断是否创建过div
if (childCreate) {
//判断当前的下拉是不是打开状态，如果是打开的就关闭掉。是关闭的就打开。
document.getElementById("selectchild" + obj.name).style.display = "none";
childCreate = false;
} else {
document.getElementById("selectchild" + obj.name).style.display = "";
childCreate = true;
}
} else {
//初始一个div放在上一个div下边，当options的替身。
var cDiv = document.createElement("div");
cDiv.id = "selectchild" + obj.name;
cDiv.style.position = "absolute";
cDiv.style.width = offset.width + "px";
cDiv.style.height = obj.options.length * 20 + "px";
cDiv.style.top = (offset.top + offset.height + 2) + "px";
cDiv.style.left = offset.left + "px";
cDiv.style.background = "#f7f7f7";
cDiv.style.border = "1px solid silver";
var uUl = document.createElement("ul");
uUl.id = "uUlchild" + obj.name;
uUl.style.listStyle = "none";
uUl.style.margin = "0";
uUl.style.padding = "0";
uUl.style.fontSize = "12px";
cDiv.appendChild(uUl);
document.body.appendChild(cDiv);
childCreate = true;
for (var i = 0; i < obj.options.length; i++) {
//将原始的select标签中的options添加到li中
var lLi = document.createElement("li");
lLi.id = obj.options[i].value;
lLi.style.textIndent = "4px";
lLi.style.height = "20px";
lLi.style.lineHeight = "20px";
lLi.innerHTML = obj.options[i].innerHTML;
uUl.appendChild(lLi);
}
var liObj = document.getElementById("uUlchild" + obj.name).getElementsByTagName("li");
for (var j = 0; j < obj.options.length; j++) {
//为li标签添加鼠标事件
liObj[j].onmouseover = function() {
this.style.background = "gray";
this.style.color = "white";
}
liObj[j].onmouseout = function() {
this.style.background = "white";
this.style.color = "black";
}
liObj[j].onclick = function() {
//做两件事情，一是将用户选择的保存到原始select标签中，要不做的再好看表单递交后也获取不到select的值了。
obj.options.length = 0;
obj.options[0] = new Option(this.innerHTML, this.id);javascript 美化上拉列表一
日期：2014-05-16 浏览次数：20357 次
javascript 美化下拉列表一
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