Question

我看到无限的帖子试图在下拉菜单中默认选择一个选项。但我无法实现它。我有一些国家。

$scope.regions = 
 [
      {
        name: "COLOMBIA",
        code: 5
      },
      {
        name: "ARGENTINA",
        code: 6
      },
      {
        name: "BRAZIL",
        code: 7
      }
  ];

我有这个变量：

$scope.selectThisId={
    "id":6,
    "animal":'dog',
    "variable":'xxx32'
 };

我需要下拉值等于

的id属性

$scope.region=$scope.selectThisId.id;

变量。

http://plnkr.co/edit/nmc8iLz6BIFac0Swfth8?p=preview

Answer 1

工作演示：http://plnkr.co/edit/zhye91pDUEMgaZnXZGWE?p=preview

您基本上可以通过

创建默认区域

$scope.select = $scope.selectThisId.id;
$scope.regionSelected = {};

然后使用select创建ng-options标记，将其绑定到模型，并在模型上调用ng-init。

<select ng-options="item as item.name for item in regions track by item.code" 
        ng-model="regionSelected" ng-init="regionSelected.code = select">
</select>

Answer 2

您可以向控制器添加过滤器以获取默认区域（不要忘记在$filter之后添加$scope）：

$scope.defaultValue = $filter('filter')($scope.regions, {code: $scope.selectThisId.id}, true)[0];

然后将其添加到您视图中的选择

ng-init="select = defaultValue"

Demo

Answer 3

DEMO

var myapp = angular.module('myapp', []);
myapp.controller('FirstCtrl', function ($scope) {
    $scope.regions = 
 [
      {
        name: "COLOMBIA",
        code: 5
      },
      {
        name: "ARGENTINA",
        code: 6
      },
      {
        name: "BRAZIL",
        code: 7
      }
  ];
  
  $scope.selectThisId={
    "id":6,
    "animal":'dog',
    "variable":'xxx32'
 };
 
 $scope.region=$scope.selectThisId.id;
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myapp">
    <fieldset ng-controller="FirstCtrl">
        <select 
            ng-options="item.code as item.name for item in regions"
            ng-model="region"></select>
    </fieldset>
</div>

在下拉列表中选择默认选项，将值保存在下拉列表的value属性中。 Angular.js。 Angular.js

3 个答案:

DEMO