Angularjavascript如何实现下拉框联动的示例代码

  <select ng-model="s1" ng-options="selectData.name for selectData in selectDatas">
    <option value="">--产品类目--</option>
  </select>
  <select ng-model="s2" ng-options="util.name for util in s1.utils">
    <option value="">--产品类型--</option>
  </select>

   $scope.selectDatas = [{
        code: 01,
        name: "监控安全类",
        utils: [
          { code: 0101, name: "遥控门锁" },
          { code: 0102, name: "声光报警器" },
          { code: 0103, name: "摄像头" }
        ]
      },
      {
        code: 02,
        name: "大家电",
        utils: [
          { code: 0201, name: "空调" },
          { code: 0202, name: "洗衣机" },
          { code: 0203, name: "洗碗机" }
        ]
      }
    ]

<select ng-model="devicetype" ng-options="x.category for x in devices" ng-change="changeType(devicetype)">
  <option value="">--设备--</option>
</select>

$scope.devices = [
   {"category":"大家电"},
     {"category":"红外感应"},
   {"category":"监控"},
   {"category":"灯光"},
]
// 根据大类来获取设备列表
$scope.changeType = function(x){
  $log.log(x.category)
  //TODO: 真正使用肯定是要用$http来请求设备列表
  //暂时测试使用下面的
  switch(x.category){
  case "大家电":
      $scope.yourdevices = [
        {"dev":"电视机(mac:32309fsaf)"},
        {"dev":"洗衣机(mac:32309fsaf)"},
        {"dev":"冰箱(mac:32309dqsq)"},
        {"dev":"空调(mac:32309fsaf)"}
      ];
      break;
  }
}

<select ng-model="yourdevice" ng-options="x.dev for x in yourdevices" ng-change="changeDev(yourdevice)">
  <option value="">--你的设备--</option>
</select>

$scope.changeDev = function (x) {
 $log.log(x.dev)
 switch (x.dev) {
  case '电视机(mac:32309fsaf)':
   $scope.params = [
    {
     'display_name': '开关',
     'data_type': 'bool',
     'data_range': [ '开','关']
    },
    {
     'display_name': '温度',
     'data_type': 'num',
     'data_range': [30]
    }
   ]
   //此处将json转换成对象，方便下面的属性相关操作，例如“开关”属性，要找去其相关的类型数据和值
   var paramsarr = $scope.params;
   var paramobj = {
   };
   paramsarr.forEach(function (v, i) {
    paramobj[v.display_name] = v;
   })
   $scope.paramobjs = paramobj;
 }
}

<select ng-model="param" ng-options="p.display_name for p in params" ng-change="changeParam(param.display_name)">
  <option value="">--属性--</option>
</select>

//获取数据类型和数据值
$scope.changeParam = function (x) {
 var pobj = $scope.paramobjs;
 $scope.views = pobj[x];
 $scope.type = $scope.views.data_type
 $log.log($scope.views)
}

<div ng-switch="type">
    <div ng-switch-when="bool" style="margin: -20px auto auto 90px;">
      <label ng-repeat="x in views.data_range">
        <input type="radio" name="radio" value="{{x}}">{{x}}
      </label>
    </div>
    <div ng-switch-when="num" style="margin: -20px auto auto 90px;">
      <select ng-model="compare">
        <option value="0">&lt;</option>
        <option value="1">=</option>
        <option value="2">&gt;</option>
      </select>
      {{views.data_range}}
      <input type="text">
    </div>
  </div>