Extjs4.0 ComboBox如何实现三级联动

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我是靠谱客的博主独特雪糕，这篇文章主要介绍Extjs4.0 ComboBox如何实现三级联动，现在分享给大家，希望可以做个参考。

很多网友在问，Extjs4.0 ComboBox如何实现，好在之前用3.x实现过一个三级联动，如今用Extjs4.0来实现同样的联动效果。其中注意的一点就是，3.x中的model:'local'在Extjs4.0中用queryMode: 'local'来表示，而且在3.x中Load数据时用reload，但是在extjs4.0中要使用load来获取数据。如下图：

代码部分

先看HTML代码：

复制代码

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<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>MHZG.NET-城市三级联动实例</title>
<link rel="stylesheet" type="text/css" href="../../resources/css/ext-all.css" />
<script type="text/javascript" src="../../bootstrap.js"></script>
<script type="text/javascript" src="../../locale/ext-lang-zh_CN.js"></script>
<script type="text/javascript" src="combobox.js"></script>
</head>

<body>
</body>
</html>

简单的很，就是加载了基本的CSS文件和JS文件，并且加载自定义的combobox.js文件。

combobox.js：

复制代码

Ext.require('Ext.*');
Ext.onReady(function(){
 //定义ComboBox模型
 Ext.define('State', {
   extend: 'Ext.data.Model',
   fields: [
     {type: 'int', name: 'id'},
     {type: 'string', name: 'cname'}
   ]
 });
 
 //加载省数据源
 var store = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=sheng&n='+new Date().getTime()+''
   },
   autoLoad: true,
   remoteSort:true
 });
 //加载市数据源
 var store1 = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=shi&n='+new Date().getTime()+''
   },
   autoLoad: false,
   remoteSort:true
 });
 //加载区数据源
 var store2 = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=qu&n='+new Date().getTime()+''
   },
   autoLoad: false,
   remoteSort:true
 });
  
 
 
 Ext.create("Ext.panel.Panel",{
  renderTo: document.body,
  width:290,
  height:220,
  title:"城市三级联动",
  plain: true,
  margin:'30 10 0 80',
  bodyStyle: "padding: 45px 15px 15px 15px;",
  defaults :{
    autoScroll: true,
    bodyPadding: 10
  },
  items:[{
    xtype:"combo",
    name:'sheng',
    id : 'sheng',
    fieldLabel:'选择省',
    displayField:'cname',
    valueField:'id',
    store:store,
    triggerAction:'all',
    queryMode: 'local', 
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择省',
    blankText : '请选择省',
    listeners:{  
      select:function(combo, record,index){
         try{
           //userAdd = record.data.name;
           var parent=Ext.getCmp('shi');
           var parent1 = Ext.getCmp("qu");
           parent.clearValue();
           parent1.clearValue();
           parent.store.load({params:{param:this.value}});
         }
         catch(ex){
           Ext.MessageBox.alert("错误","数据加载失败。");
         }
      }
    }
    },
    {
    xtype:"combo",
    name:'shi',
    id : 'shi',
    fieldLabel:'选择市',
    displayField:'cname',
    valueField:'id',
    store:store1,
    triggerAction:'all',
    queryMode: 'local',
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择市',
    blankText : '请选择市',
    listeners:{  
      select:function(combo, record,index){
         try{
           //userAdd = record.data.name;
           var parent = Ext.getCmp("qu");
           parent.clearValue();
           parent.store.load({params:{param:this.value}});
         }
         catch(ex){
           Ext.MessageBox.alert("错误","数据加载失败。");
         }
      }
    }
    },
    {
    xtype:"combo",
    name:'qu',
    id : 'qu',
    fieldLabel:'选择区',
    displayField:'cname',
    valueField:'id',
    store:store2,
    triggerAction:'all',
    queryMode: 'local',
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择区',
    blankText : '请选择区',
    }
  ]
 })
});

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Ext.require('Ext.*');
Ext.onReady(function(){
 //定义ComboBox模型
 Ext.define('State', {
   extend: 'Ext.data.Model',
   fields: [
     {type: 'int', name: 'id'},
     {type: 'string', name: 'cname'}
   ]
 });
 
 //加载省数据源
 var store = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=sheng&n='+new Date().getTime()+''
   },
   autoLoad: true,
   remoteSort:true
 });
 //加载市数据源
 var store1 = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=shi&n='+new Date().getTime()+''
   },
   autoLoad: false,
   remoteSort:true
 });
 //加载区数据源
 var store2 = Ext.create('Ext.data.Store', {
   model: 'State',
   proxy: {
     type: 'ajax',
     url: 'city.asp?act=qu&n='+new Date().getTime()+''
   },
   autoLoad: false,
   remoteSort:true
 });
  
 
 
 Ext.create("Ext.panel.Panel",{
  renderTo: document.body,
  width:290,
  height:220,
  title:"城市三级联动",
  plain: true,
  margin:'30 10 0 80',
  bodyStyle: "padding: 45px 15px 15px 15px;",
  defaults :{
    autoScroll: true,
    bodyPadding: 10
  },
  items:[{
    xtype:"combo",
    name:'sheng',
    id : 'sheng',
    fieldLabel:'选择省',
    displayField:'cname',
    valueField:'id',
    store:store,
    triggerAction:'all',
    queryMode: 'local', 
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择省',
    blankText : '请选择省',
    listeners:{  
      select:function(combo, record,index){
         try{
           //userAdd = record.data.name;
           var parent=Ext.getCmp('shi');
           var parent1 = Ext.getCmp("qu");
           parent.clearValue();
           parent1.clearValue();
           parent.store.load({params:{param:this.value}});
         }
         catch(ex){
           Ext.MessageBox.alert("错误","数据加载失败。");
         }
      }
    }
    },
    {
    xtype:"combo",
    name:'shi',
    id : 'shi',
    fieldLabel:'选择市',
    displayField:'cname',
    valueField:'id',
    store:store1,
    triggerAction:'all',
    queryMode: 'local',
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择市',
    blankText : '请选择市',
    listeners:{  
      select:function(combo, record,index){
         try{
           //userAdd = record.data.name;
           var parent = Ext.getCmp("qu");
           parent.clearValue();
           parent.store.load({params:{param:this.value}});
         }
         catch(ex){
           Ext.MessageBox.alert("错误","数据加载失败。");
         }
      }
    }
    },
    {
    xtype:"combo",
    name:'qu',
    id : 'qu',
    fieldLabel:'选择区',
    displayField:'cname',
    valueField:'id',
    store:store2,
    triggerAction:'all',
    queryMode: 'local',
    selectOnFocus:true,
    forceSelection: true,
    allowBlank:false,
    editable: true,
    emptyText:'请选择区',
    blankText : '请选择区',
    }
  ]
 })
});

上述代码中，如果在ComboBox直接定义store数据源，会出现这样一种情况，那就是当选择完第一个省，点击第二个市的时候，会闪一下，再点击，才会出现市的数据。那么要解决这样的情况，那么必须先要定义好省、市、区的数据源。那么再点击的时候，就不会出现上述情况了。

代码中，使用store为省的数据，设置其autoLoad为true，那么页面第一次加载的时候，就会自动加载省的数据，然后给省和市添加了监听select，作用在于当点击省的时候，要清空市和区的数据，并根据当前选定的值去加载对应的数据到市的数据源中。当然store1和store2原理是一样的。

最后，服务端要根据传的值进行数据检索及返回正确数据，这里没有从数据库中查询数据，而只是简单的写了一些测试代码，相信extjs代码没有任何的问题了，那么服务端返回数据，就不是一件很重要的事情了。

City.asp：

复制代码

<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<%
  Response.ContentType = "text/html"
  Response.Charset = "UTF-8"
%>
<%
  Dim act:act = Request("act")
  Dim param : param = Request("param")
  If act = "sheng" Then
    Response.Write("[")
    Response.Write("{""cname"":""北京市"",""id"":""110000""},")
    Response.Write("{""cname"":""内蒙古自治区"",""id"":""150000""}")
    Response.Write("]")
  End If
  If act = "shi" Then
    If param = "110000" Then
      Response.Write("[")
      Response.Write("{""cname"":""市辖区"",""id"":""110100""},")
      Response.Write("{""cname"":""市辖县"",""id"":""110200""}")
      Response.Write("]")
    ElseIf param = "150000" Then
      Response.Write("[")
      Response.Write("{""cname"":""呼和浩特市"",""id"":""150100""},")
      Response.Write("{""cname"":""包头市"",""id"":""150200""}")
      Response.Write("]")
    End If
  End If
  If act = "qu" Then
    If param = "110100" Then
      Response.Write("[")
      Response.Write("{""cname"":""朝阳区"",""id"":""110101""},")
      Response.Write("{""cname"":""昌平区"",""id"":""110102""}")
      Response.Write("]")
    ElseIf param = "110200" Then
      Response.Write("[")
      Response.Write("{""cname"":""密云县"",""id"":""110201""},")
      Response.Write("{""cname"":""房山县"",""id"":""110202""}")
      Response.Write("]")
    ElseIf param = "150100" Then
      Response.Write("[")
      Response.Write("{""cname"":""回民区"",""id"":""150101""},")
      Response.Write("{""cname"":""新城区"",""id"":""150102""}")
      Response.Write("]")
    ElseIf param = "150200" Then
      Response.Write("[")
      Response.Write("{""cname"":""青山区"",""id"":""150201""},")
      Response.Write("{""cname"":""东河区"",""id"":""150202""}")
      Response.Write("]")
    End If
  End If
%>

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<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<%
  Response.ContentType = "text/html"
  Response.Charset = "UTF-8"
%>
<%
  Dim act:act = Request("act")
  Dim param : param = Request("param")
  If act = "sheng" Then
    Response.Write("[")
    Response.Write("{""cname"":""北京市"",""id"":""110000""},")
    Response.Write("{""cname"":""内蒙古自治区"",""id"":""150000""}")
    Response.Write("]")
  End If
  If act = "shi" Then
    If param = "110000" Then
      Response.Write("[")
      Response.Write("{""cname"":""市辖区"",""id"":""110100""},")
      Response.Write("{""cname"":""市辖县"",""id"":""110200""}")
      Response.Write("]")
    ElseIf param = "150000" Then
      Response.Write("[")
      Response.Write("{""cname"":""呼和浩特市"",""id"":""150100""},")
      Response.Write("{""cname"":""包头市"",""id"":""150200""}")
      Response.Write("]")
    End If
  End If
  If act = "qu" Then
    If param = "110100" Then
      Response.Write("[")
      Response.Write("{""cname"":""朝阳区"",""id"":""110101""},")
      Response.Write("{""cname"":""昌平区"",""id"":""110102""}")
      Response.Write("]")
    ElseIf param = "110200" Then
      Response.Write("[")
      Response.Write("{""cname"":""密云县"",""id"":""110201""},")
      Response.Write("{""cname"":""房山县"",""id"":""110202""}")
      Response.Write("]")
    ElseIf param = "150100" Then
      Response.Write("[")
      Response.Write("{""cname"":""回民区"",""id"":""150101""},")
      Response.Write("{""cname"":""新城区"",""id"":""150102""}")
      Response.Write("]")
    ElseIf param = "150200" Then
      Response.Write("[")
      Response.Write("{""cname"":""青山区"",""id"":""150201""},")
      Response.Write("{""cname"":""东河区"",""id"":""150202""}")
      Response.Write("]")
    End If
  End If
%>