为什么在select处添加onchange事件无效？？
本帖最后由 dengjiejie1990 于 2013-05-26 23:57:29 编辑
JavaScript select
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>图片+JavaScript+CSS打造漂亮的select下拉选择框
- www.webdm.cn</title>
<style type="text/css">
body{margin:20px auto;font-family:Arial,Helvetica,sans-serif;font-size:12px;width:950px;height:400px;border:solid 1px #aaa;position:relative;padding:10px;}
h1{font-size:12px;color:#444;}
ul{margin:0;padding:0;list-style:none;}
.dropDownList{position:absolute;left:100px;top:100px;}
.dropDownList div.dropdown{float:left;margin-right:120px;}
.dropDownList span{display:block;width:146px;height:26px;background:url(http://www.webdm.cn/images/20100411/selectbg.gif) left top no-repeat;line-height:26px;text-indent:12px;border:solid 1px #83BBD9;cursor:default;}
.dropDownList span.over{background-position:left bottom;border-color:#B4C91A;}
.dropDownList ul{width:200px;display:none;position:absolute;}
.dropDownList ul li{background:#eee;height:20px;width:100%;padding:3px 0;text-indent:12px;cursor:default;line-height:20px;}
/*普通状态下的样式*/
.dropDownList ul li.normal{background:#eee;}
/*鼠标移上的样式*/
.dropDownList ul li.over{background:#ccc;}
/*被选中的样式*/
.dropDownList ul li.current{background:#c2c2c2;font-weight:bold;}
.dropDownList ul.show{display:block;}
</style>
</head>
<body>
<form action="#" method="get">
<div class="dropDownList">
<div id="dropDownList1" class="dropdown">
<select name="birthday" style="display: none">
<option>请选择</option>
<option>1986</option>
<option>1987</option>
<option selected="selected" onchange="javascript:alert('aaaaa')">1988</option>
<option>1989</option>
<option>1990</option>
</select>
<span>请选择年份</span>
<ul></ul>
</div>
<div id="dropDownList2" class="dropdown">
<select name="sex" style="display: none">
<option>性别</option>
<option>男</option>
<option selected="selected">女</option>
<option>不是男，也不是女</option>
</select>
<span>请选择性别</span>
<ul></ul>
</div>
<div id="dropDownList3" class="dropdown">
<select name="student" style="display: none">
<option>aaa</option>
<option>小学</option>
<option selected="selected">初中</option>
<option>高中</option>
</select>
<span>请选择学历</span>
<ul></ul>
</div>
</div>
</form>
<script type="text/javascript">
var ____configArray;
function __initDropDownList(configArray) {
//获取Select菜单
____configArray = configArray;
var existArray = configArray.split("|");
for (var i = 0; i < existArray.length; i++) {
if (existArray[i].length < 1) { return; }
//根据参数分别获取div，并分别添加事件
var parentContainer = document.getElementById(existArray[i]);
if (!parentContainer) { return; }
//获取下面的select，且获取其中的option
var selectObj = parentContainer.getElementsByTagName("select");
if (selectObj.length < 1) { return; }
var optionArray = selectObj[0].getElementsByTagName("option");
//获取option，并分别添加到各个li
var optionLength = optionArray.length;
for (var j = 0; j < optionLength; j++) {
//获取ul，以便能够添加项目
var ulObj = parentContainer.getElementsByTagName("ul");
if (ulObj.length < 1) { return; }
//获取span，以便能显示当前选择的项目
var spanObj = parentContainer.getElementsByTagName("span");
if (spanObj.length < 1) { return; }
var liObj = document.createElement("li");
var textNode = document.createTextNode(optionArray[j].firstChild.nodeValue)
liObj.appendChild(textNode);
liObj.setAttribute("currentIndex", j);
//如果option的selected="selected"
if (optionArray[j].selected) {
selectCurrentItem(ulObj[0], liObj);
}
//给每个liObj添加事件
liObj.onclick = function () {
selectCurrentItem(this.parentNode, this);
}
liObj.onmouseover = function () { if (this.className.indexOf("current") < 0) { this.className = "over"; } }
liObj.onmouseout = function () { if (this.className.indexOf("current") < 0) { this.className = "normal"; } }
ulObj[0].appendChild(liObj);
spanObj[0].onclick = function (event) {
//如果当前是显示的，就隐藏，反之亦然
showHiddenUl(this);
}
spanObj[0].onmouseover = function () { this.className = 'over'; }
spanObj[0].onmouseout = function () { this.className = ""; };
ulObj[0].onclick = function () { this.className = ""; }
}
parentContainer.onclick = function (event) {
if (!event) { event = window.event; }
event.cancelBubble = true;
var eventUlObj = this.getElementsByTagName("ul")[0];
bodyClickHiddenUl(eventUlObj);
}
}
}
function selectCurrentItem(ulObj, currentObj) {
var parentObj = ulObj.parentNode;
var spanObj = parentObj.getElementsByTagName("span")[0];
spanObj.firstChild.nodeValue = currentObj.firstChild.nodeValue;
var selectObj = parentObj.getElementsByTagName("select")[0];
selectObj.selectedIndex = parseInt(currentObj.getAttribute("currentIndex"));
var ulLiObj = ulObj.getElementsByTagName("li");
var length = ulLiObj.length;
var currentLiObj = null;
for (var i = 0; i < length; i++) {
currentLiObj = ulLiObj[i];
currentLiObj.className = "normal";
}
currentObj.className = "current";
}
function showHiddenUl(currentObj) {
var parentNode = currentObj.parentNode;
var ulObj = parentNode.getElementsByTagName("ul")[0];
if (ulObj.className == "") {
ulObj.className = "show";
} else {
ulObj.className = "";
}
}
//点击body区域（非“下拉菜单”）隐藏菜单
function addBodyClick(func) {
var bodyObj = document.getElementsByTagName("body")[0];
var oldBodyClick = bodyObj.onclick;
if (typeof bodyObj.onclick != 'function') {
bodyObj.onclick = func;
} else {
bodyObj.onclick = function () {
oldBodyClick();
func();
}
}
}
//隐藏所有的UL
function bodyClickHiddenUl(eventUlObj) {
var existArray = ____configArray.split("|");
for (var i = 0; i < existArray.length; i++) {
if (existArray[i].length < 1) { return; }
//寻找所有UL并且隐藏
var parentContainer = document.getElementById(existArray[i]);
if (!parentContainer) { return; }
var ulObj = parentContainer.getElementsByTagName("ul");
if (eventUlObj != ulObj[0]) {
ulObj[0].className = "";
}
}
}
var __dropDownList = "dropDownList1|dropDownList2|dropDownList3";
__initDropDownList(__dropDownList);
//添加这个可以确保点击body区域的时候 也可以隐藏菜单
addBodyClick(bodyClickHiddenUl);
</script>
<br />
</body>
</html>
[解决办法]
<select onchange=''></select>
只能在这个标签里
而且选择列表的change事件放在 选择项上 也没意义把
[解决办法]
奇怪的是你为什么要写在opation 里面?
你如果非要是做 opation 的值是1988的时候弹出 aaaa 的话，你在select 的change 里面判断下当前值 如果是 1988 就弹出来就好，你这个问题应该是从想法上 来解决