Angularjs使用下拉列表过滤数据

Question

我是angularjs和javascript的新人,所以请善待,我有两个下拉项目(离子选择)他们都持有服务数据.问题是我需要过滤它们才能一起工作:如果我在第一个下拉列表中选择一个公司,那么只有该公司内部的代表应显示在另一个下拉列表中.

我| filter: byID在Angularjs文档中尝试使用,但我不认为这是不正确的做法.

HTML:

<label class="item item-input item-select"">
    <div class="input-label">
      Company:
    </div>
    <select>
      <option ng-repeat="x in company">{{x.compname}}</option>
      <option selected>Select</option>      
    </select>
  </label>
   <div class="list">
  <label class="item item-input item-select">
    <div class="input-label">
      Rep:
    </div>
    <select>
       <option ng-repeat="x in represent">{{x.repname}}</option>
      <option selected>Select</option>
    </select>
  </label>

使用Javascript:

/*=========================Get All Companies=========================*/
 $http.get("http://localhost:15021/Service1.svc/GetAllComp")
      .success(function(data) {

        var obj = data;
        var SComp = [];


    angular.forEach(obj, function(index, element) {

    angular.forEach(index, function(indexN, elementN) {        

        SComp.push({compid: indexN.CompID, compname: indexN.CompName});

        $scope.company = SComp;
    });    

    });          
            })
/*=========================Get All Companies=========================*/

/*=========================Get All Reps=========================*/
 $http.get("http://localhost:15021/Service1.svc/GetAllReps")
      .success(function(data) {

        var obj = data;
        var SReps = [];


    angular.forEach(obj, function(index, element) {

    angular.forEach(index, function(indexN, elementN) {        

        SReps.push({repid: indexN.RepID, repname: indexN.RepName, fkc :indexN.fk_CompID});

        $scope.represent = SReps;
    });    

    });          
            })
/*=========================Get All Reps=========================*/

Answer 1

你可以解决这个问题,就像我的解决方案一样:我的解决方案就像你的问 根据选定的区域,首先显示区域列表并显示Thana列表.使用过滤表达式

在HTML中:

<div>
        <form class="form-horizontal">
            <div class="form-group">
                <div class="col-md-3"><label><i class="fa fa-question-circle fa-fw"></i> District List</label></div>
                <div class="col-md-4">
                    <select class="form-control" ng-model="selectedDist" ng-options="district.name for district in districts">
                        <option value="">Select</option>
                    </select>
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-3"><label><i class="fa fa-question-circle fa-fw"></i> Thana List</label></div>
                <div class="col-md-4">
                    <select class="form-control" ng-model="selectedThana" ng-options="thana.name for thana in thanas | filter: filterExpression">
                        <option value="">Select</option>
                    </select>
                </div>
            </div>
        </form>
    </div>

在控制器中:

            $scope.selectedDist={};
            $scope.districts = [
                {id: 1, name: 'Dhaka'},
                {id: 2, name: 'Goplaganj'},
                {id: 3, name: 'Faridpur'}
            ];

            $scope.thanas = [
                {id: 1, name: 'Mirpur', dId: 1},
                {id: 2, name: 'Uttra', dId: 1},
                {id: 3, name: 'Shahabag', dId: 1},
                {id: 4, name: 'Kotalipara', dId: 2},
                {id: 5, name: 'Kashiani', dId: 2},
                {id: 6, name: 'Moksedpur', dId: 2},
                {id: 7, name: 'Vanga', dId: 3},
                {id: 8, name: 'faridpur', dId: 3}
            ];
            $scope.filterExpression = function(thana) {
                return (thana.dId === $scope.selectedDist.id );
            };

注意:这里 filterExpression是一个自定义函数,当选择的区域id等于dId时返回值.