Question

如何使用angularJS填充下拉列表？

我已在两个下拉列表中成功设置了该选项。

在我的下拉列表中，一个依赖于另一个，即父母有相应的孩子

假设在我的数据库中，我存储的父名是London，子名是London State2，

在我的html页面中，当我点击编辑此内容时，我需要在我的下拉框中填充整个数据，选择此特定父名称为“London”，子名称为“London State2”

编辑内容将在drobdown菜单中选择的内容时唯一的事情..

即。我想在打开此页面时默认选择父名称作为伦敦，子名称是伦敦州名称

当我打开此页面时，我的问题是默认为父名称是--Select--而子名称是--Select--

这是我的script.js

的script.js

var app=angular.module('TestApp', ['angular.filter','ui.router']);

app.config(function($stateProvider, $urlRouterProvider) {

    $urlRouterProvider.otherwise('/');

    $stateProvider
    .state('category',
    {
    views : {  
        "body" :
    {
        url : '/category',
        templateUrl : 'category.html',
        controller : 'TestController'
    }
    }  

    })

    .state('category.subcategory',
    {
    url : '/subcategory',
    views : {                             
    "subbody@category" :
    {
    templateUrl : 'sample.html',
    controller : 'SampleController'             
    }
    }
    })
});

app.controller('MainController', MainController);

function MainController($scope,$state)
{
    alert("This is MainController")

    $scope.getCategory=function()
    {
    $state.go('category');
    }


}

app.controller('TestController', TestController);

//TestController.$inject['dataservice'];

function TestController($scope, $state){


    $scope.data=[
     {
      "parentName": "India",
      "childName": "India State1"         
     },
     {
      "parentName": "USA",
      "childName": "USA State1"        
     },
     {
      "parentName": "London",
      "childName": "London State1"         
     },

     {
      "parentName": "India",
      "childName": "India State2"         
     },
     {
      "parentName": "USA",
      "childName": "USA State2"        
     },
     {
      "parentName": "USA",
      "childName": "USA State3"         
     },
     {
      "parentName": "London",
      "childName": "London State2"         
     }
    ];

    $scope.selectedParent="London";
    $scope.selectedChild="London State2";

    function onParentChange(parent){
      if(!parent){
    $scope.child = undefined;
      }
    }


    $scope.getValue=function()
    {
    alert("Call to Sample Controller")

    var currentState = $state.current.name;
    var targetState = 'category.subcategory';

    if(currentState === targetState)
      $state.go($state.current, {}, {reload: true});
    else
    $state.go(targetState);
    $state.go(".subcategory");

    //$state.go('category.subcategory');
    }
}


app.controller('SampleController', SampleController);

function SampleController($scope,$state)
{
    alert("This is SampleController")

}

的index.html

<!DOCTYPE html>
<html ng-app="TestApp">

  <head>
    <link rel="stylesheet">
        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>
          <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular-route.min.js"></script>
          <script src="https://cdnjs.cloudflare.com/ajax/libs/angular-filter/0.5.8/angular-filter.js"></script>
          <script src="angular-ui-router.js"></script>     
        <script src="script.js"></script>
        <script src="angular-filter.js"></script>
  </head>

    <body ng-controller="MainController">
        <a href="#" ng-click="getCategory()">Click to Category</a>
        <div ui-view="body"></div>   
    </body>
</html>

category.html

  <div>   
    <hr>

    <div class="col-md-3">
      <form>
    <div class="form-group">
      <label for="exampleSelect1"><b>Parent</b></label>
      <select ng-model="selectedParent"
        ng-init="selectedParent = null"
        ng-change="onParentChange(selectedParent)"
        class="form-control" id="data">
        <option value="">--Select--</option>
        <option ng-repeat="(key,value) in data | orderBy:'parentName'| groupBy:'parentName'">{{key}}</option>          
      </select>
    </div>             
      </form> 
    </div>     
    <div class="col-md-3">     
      <form>   
    <div class="form-group">
      <label for="exampleSelect1"><b>Child Names</b></label>
      <select class="form-control" id="childnames" ng-model="child"
        ng-disabled="!selectedParent"
        ng-options="data.childName for data in data| filter: {parentName:selectedParent} | removeWith:{childName : 'Infant Food'}" ng-change="getValue()">
        <option value="">--Select--</option>
      </select>
    </div>         

      </form>    
  </div>
    <div ui-view="subbody"></div>
  </div>

sample.html

<div>
    Sample Controller
</div>

Answer 1

从您的示例中，您希望伦敦应该是您下拉列表中的默认值..您可以通过这样的方式实现此目的而不是ng-init，

$scope.selectedParent = 'London'
$scope.selectedParent = $scope.data[2]['parentName'] // it will show london according to your eg data file.

//for child,
$scope.child = 'London State1'
$scope.child = $scope.data[2]['childName']

当您从前端的下拉列表中选择值时，这将自动更新。

如何使用angularJS填充下拉列表中的值？

1 个答案: