AngularJs：将ng-model绑定到单选按钮列表

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问题描述

我试图将单选按钮列表中的选定值绑定到 ng-model

Im trying to bind the selected value in a list of radio buttons to an ng-model

I拥有：

<!DOCTYPE html>

<html ng-app="testApp">
    <head>
        <script src="./bower_components/angular/angular.min.js"></script>
        <script src="test.js"></script>
    </head>
    <body ng-controller="testController">
        <form>
            <div ng-repeat="option in occurrenceOptions">
                <input type="radio" name="occurrence" ng-value="option" ng-model="selectedOccurrence" /><label>{{ option }}</label>
            </div>
        </form>
        <div>The selected value is : {{ selectedOccurrence }}</div>

        <!-- This works -->
        <input type="radio" ng-model="selected2" ng-value="'1'"> 1
        <input type="radio" ng-model="selected2" ng-value="'2'"> 2
        <input type="radio" ng-model="selected2" ng-value="'3'"> 3

        <div>This selected value is : {{ selected2 }} </div>
    </body>
</html>

对于我的控制器：

(function () {

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

    app.controller('testController', function($scope) {
        $scope.occurrenceOptions = [];

        $scope.occurrenceOptions.push('previous');
        $scope.occurrenceOptions.push('current');
        $scope.occurrenceOptions.push('next');

        $scope.selected2;
    });
}());

在第一部分中，我尝试重复所有 occurrence事件并将它们全部绑定到同一个模型。但是，每次选择 selectedOccurrence 值时都不会改变。

In the first section, I tried to ng-repeat all the occurrenceOptions and bind them all to the same model. However, each time I select something the selectedOccurrence value does not change.

请参阅plunkr：

See plunkr: https://plnkr.co/edit/k1pMgkLdrMUG1blktQx1?p=preview

没有 ng-repeat ，只需输入所有单选按钮，我就可以使用它。为什么 ng-repeat 版本不起作用？

without the ng-repeat and just typing out all the radio buttons, I am able to get this to work. Why is the ng-repeat version not working?

推荐答案

原因它背后不起作用，你正在使用 ng-repeat &你在其中定义 ng-model 变量。 ng-repeat 的工作方式是，它在每次迭代的集合中创建一个新的子范围（原型继承）。因此，位于 ng-repeat 模板中的 ng-model 属于新创建的范围。这里 ng-model =selectedOccurrence在 ng-的每次迭代中创建 selectedOccurrence 范围变量重复。

The reason behind it is not working is, you are using ng-repeat & you are defining ng-model variable in it. The way ng-repeat works is, it create a new child scope(prototypically inherited) on each iteration of collection. So the ng-model which resides in ng-repeat template, belongs that newly created scope. Here ng-model="selectedOccurrence" create selectedOccurrence scope variable on each iteration of ng-repeat.

要解决此类问题，您需要在定义时遵循点规则 AngularJS中的模型

To overcome such a problem you need to follow dot rule while defining model in AngularJS

加价

<body ng-controller="testController">
  <form>
    <div ng-repeat="option in occurrenceOptions track by $index">
      <input type="radio" name="occurrences" ng-value="option" ng-model="model.selectedOccurrence" />
      <label>{{ option }}</label>
    </div>
  </form>
  <div>The selected value is : {{ model.selectedOccurrence }}</div>
</body>

代码

$scope.model = {}; //defined a model object
$scope.model.selectedOccurrence = 'current'; //and defined property in it

或者另一个首选方式是在声明控制器时使用 controllerAs 模式（使用此而不是 $ scope 内部控制器。）

OR Another preferred way would be using controllerAs pattern while declaring controller(use this instead of $scope inside controller).

HTML

<body ng-controller="testController as vm">
    <form>
        <div ng-repeat="option in vm.occurrenceOptions">
            <input type="radio" name="occurrence" ng-value="option" ng-model="vm.selectedOccurrence" /><label>{{ option }}</label>
        </div>
    </form>
</body>

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