<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript 自定义多级联动下拉菜单</title>
<script type="text/javascript">var $ = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
function addEventHandler(oTarget, sEventType, fnHandler) {
if (oTarget.addEventListener) {
oTarget.addEventListener(sEventType, fnHandler, false);
} else if (oTarget.attachEvent) {
oTarget.attachEvent("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = fnHandler;
}
};
function Each(arrList, fun) {
for (var i = 0,
len = arrList.length; i < len; i++) {
fun(arrList[i], i);
}
};
function GetOption(val, txt) {
var op = document.createElement("OPTION");
op.value = val;
op.innerHTML = txt;
return op;
};
var Class = {
create: function() {
return function() {
this.initialize.apply(this, arguments);
}
}
}
Object.extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
var CascadeSelect = Class.create();
CascadeSelect.prototype = {
//select集合,菜单对象
initialize: function(arrSelects, arrMenu, options) {
if (arrSelects.length <= 0 || arrMenu.lenght <= 0) return; //菜单对象
var oThis = this;
this.Selects = []; //select集合
this.Menu = arrMenu; //菜单对象
this.SetOptions(options);
this.Default = this.options.Default || [];
this.ShowEmpty = !!this.options.ShowEmpty;
this.EmptyText = this.options.EmptyText.toString();
//设置Selects集合和change事件
Each(arrSelects,
function(o, i) {
addEventHandler((oThis.Selects[i] = $(o)), "change",
function() {
oThis.Set(i);
});
});
this.ReSet();
},
//设置默认属性
SetOptions: function(options) {
this.options = { //默认值
Default: [],
//默认值(按顺序)
ShowEmpty: false,
//是否显示空值(位于第一个)
EmptyText: "请选择" //空值显示文本(ShowEmpty为true时有效)
};
Object.extend(this.options, options || {});
},
//初始化select
ReSet: function() {
this.SetSelect(this.Selects[0], this.Menu, this.Default.shift());
this.Set(0);
},
//全部select设置
Set: function(index) {
var menu = this.Menu
//第一个select不需要处理所以从1开始
for (var i = 1,
len = this.Selects.length; i < len; i++) {
if (menu.length > 0) {
//获取菜单
var value = this.Selects[i - 1].value;
if (value != "") {
Each(menu,
function(o) {
if (o.val == value) {
menu = o.menu || [];
}
});
} else {
menu = [];
}
//设置菜单
if (i > index) {
this.SetSelect(this.Selects[i], menu, this.Default.shift());
}
} else {
//没有数据
this.SetSelect(this.Selects[i], [], "");
}
}
//清空默认值
this.Default.length = 0;
},
//select设置
SetSelect: function(oSel, menu, value) {
oSel.options.length = 0;
oSel.disabled = false;
if (this.ShowEmpty) {
oSel.appendChild(GetOption("", this.EmptyText));
}
if (menu.length <= 0) {
oSel.disabled = true;
return;
}
Each(menu,
function(o) {
var op = GetOption(o.val, o.txt ? o.txt: o.val);
op.selected = (value == op.value);
oSel.appendChild(op);
});
},
//添加菜单
Add: function(menu) {
this.Menu[this.Menu.length] = menu;
this.ReSet();
},
//删除菜单
Delete: function(index) {
if (index < 0 || index >= this.Menu.length) return;
for (var i = index,
len = this.Menu.length - 1; i < len; i++) {
this.Menu[i] = this.Menu[i + 1];
}
this.Menu.pop()
this.ReSet();
}
};
window.onload = function() {
var menu = [
{
'val': '1',
'txt': 'value'
},
{
'val': '2 ->',
'menu': [
{
'val': '2_1'
},
{
'val': '2_2'
}
]
},
{
'val': '3 ->',
'menu': [
{
'val': '3_1 ->',
'menu': [
{
'val': '3_1_1'
},
{
'val': '3_1_2'
}
]
},
{
'val': '3_2'
}
]
},
{
'val': '4 ->',
'menu': [
{
'val': '4_1 ->',
'menu': [
{
'val': '4_1_1 ->',
'menu': [
{
'val': '4_1_1_1'
}
]
}
]
}
]
}
];
var sel = ["sel1", "sel2", "sel3", "sel4", "sel5"];
var val = ["3 ->", "3_1 ->", "3_1_2"];
var cs = new CascadeSelect(sel, menu, {
Default: val
});
$("btnA").onclick = function() {
cs.ShowEmpty = !cs.ShowEmpty;
}
$("btnB").onclick = function() {
cs.Add(
{
'val': '5 ->',
'menu': [
{
'val': '5_1 ->',
'menu': [
{
'val': '5_1_1 ->',
'menu': [
{
'val': '5_1_1_1 ->',
'menu': [
{
'val': '5_1_1_1_1'
}
]
}
]
}
]
}
]
}
)
}
$("btnC").onclick = function() {
cs.Delete(3)
}
}</script>
<style type="text/css">.sel select{ width:100px;}</style></head>
<body>
<div class="sel">
<select id="sel1"></select>
<select id="sel2"></select>
<select id="sel3"></select>
<select id="sel4"></select>
<select id="sel5"></select>
</div>
<br />
<div>
<input id="btnA" type="button" value="显示/不显示空值" />
<input id="btnB" type="button" value="添加菜单" />
<input id="btnC" type="button" value="减少菜单" /></div>
</body>
</html> 附件 duoji.zip ( 2.33 KB 下载:69 次 )
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