`

三级联动 多级联动 JavaScript

JavaScriptprototypeHTMLXHTML 
阅读更多 
<%@ page contentType="text/html;charset=utf-8"%>
<!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=gb2312" />
<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'},
                    {'val': '4_1_1_2'}
                ]}
            ]}
        ]}
    ];
    
    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>
<%String sel1 = request.getParameter("sel1"); System.out.println(sel1);%>
<%String sel2 = request.getParameter("sel2"); System.out.println(sel2);%>
<%String sel3 = request.getParameter("sel3"); System.out.println(sel3);%>
<%String sel4 = request.getParameter("sel4"); System.out.println(sel4);%>
<%String sel5 = request.getParameter("sel5"); System.out.println(sel5);%>
<%out.println(sel1);%>|
<%out.println(sel2);%>|
<%out.println(sel3);%>|
<%out.println(sel4);%>|
<%out.println(sel5);%>
<form action="">
<div class="sel">
<select id="sel1" name="sel1"></select>
<select id="sel2" name="sel2"></select>
<select id="sel3" name="sel3"></select>
<select id="sel4" name="sel4"></select>
<select id="sel5" name="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>
<input type="submit" value="提 交"/>
</form>

</body>
</html>


引自：http://www.cnblogs.com/cloudgamer/archive/2008/06/24/1228736.html
也可参见附件（引自作者原文）！
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