在 AngularJS 中使 ng-options 动态化

Question

我有一个数组如下：

$scope.age = 2;
$scope.people = [{name:"Sam",age:2},{name:"Pam",age:3},{name:"Ham",age:4}]

我希望 ng-options 是动态的，即如果年龄为 2，则在 ng-options 中显示所有对象。如果年龄为 1，则显示名称为 "Sam".

的对象

$scope.age 的值可以是 1 或 2。

如何在 AngularJS 中执行此操作而不编写不同的 select 语句块？

Answer 1

ng-options指令也可以解析filters，所以你可以这样做：

<select ng-options="person as person for person in people | filter:{age:age}">
</select>

见this jsfiddle

Answer 2

您可以将 select 绑定到函数的结果：

<select ng-options="person as person for person in getPersons()">
</select>

然后像这样设置你的示波器：

$scope.age = 2;
$scope.people = [{name:"Sam",age:2},{name:"Pam",age:3},{name:"Ham",age:4}]
$scope.getPersons = function() {
    if ($scope.age = 1)
        return $scope.people.filter(function(item) {
            item.name == "Sam";
        });
    else
        return $scope.people;
};

Answer 3

您可以使用 AngularJS filter 如下所示的自定义函数。

工作示例：（在下面的文本框中键入 1 或 2 以测试此）

var app = angular.module('app', []);

app.controller('TestController', function($scope) {
  $scope.age = 2;
  $scope.people = [{name:"Sam",age:2},{name:"Pam",age:3},{name:"Ham",age:4}];
  $scope.filterPeople = function(person) {
     return $scope.age === 2 || person.name === "Sam";
  };
});

angular.bootstrap(document, ['app']);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-controller="TestController">
  Age: <input type="text" ng-model="age" />
  <select ng-options="person as person.name for person in people | filter:filterPeople" ng-model="selected">
  </select>
</div>

在 AngularJS 中使 ng-options 动态化

Making ng-options dynamic in AngularJS

javascript

angularjs

select

ng-options