AngularJS：如何绑定到复选框值列表？ [英] AngularJS : How to bind to list of checkbox values?

问题描述

我有几个复选框：

<input type='checkbox' value="apple" checked>
<input type='checkbox' value="orange">
<input type='checkbox' value="pear" checked>
<input type='checkbox' value="naartjie">

这是我想绑定到一个列表，我的控制器，使得每当一个复选框被改变控制器例如维护所有的检查值的列表 ['苹果'，'鸭梨'] 。

That I would like to bind to a list in my controller such that whenever a checkbox is changed the controller maintains a list of all the checked values e.g. ['apple', 'pear'].

纳克模型似乎只能单一复选框的值绑定到所述控制器的变量。

ng-model seems to only be able to bind the value of one single checkbox to a variable in the controller.

有另一种方式做到这一点，这样我可以在四个复选框绑定到contrller列表？

Is there another way to do it so that I can bind the four checkboxes to a list in the contrller?

推荐答案

有两种方法来解决这个问题。无论是使用一个简单的数组或对象的数组。每个解决方案都有其优点和缺点。下面你会发现一个每个案例。

There are two ways to approach this problem. Either use a simple array or an array of objects. Each solution has it pros and cons. Below you'll find one for each case.

在HTML可能看起来像：

the html could look like:

<label ng-repeat="fruitName in fruits">
  <input
    type="checkbox"
    name="selectedFruits[]"
    value="{{fruitName}}"
    ng-checked="selection.indexOf(fruitName) > -1"
    ng-click="toggleSelection(fruitName)"
  > {{fruitName}}
</label>

和适当的控制器code将是：

and the appropriate controller code would be:

app.controller('SimpleArrayCtrl', ['$scope', function SimpleArrayCtrl($scope) {
  // fruits
  $scope.fruits = ['apple', 'orange', 'pear', 'naartjie'];

  // selected fruits
  $scope.selection = ['apple', 'pear'];

  // toggle selection for a given fruit by name
  $scope.toggleSelection = function toggleSelection(fruitName) {
    var idx = $scope.selection.indexOf(fruitName);

    // is currently selected
    if (idx > -1) {
      $scope.selection.splice(idx, 1);
    }

    // is newly selected
    else {
      $scope.selection.push(fruitName);
    }
  };
}]);

赞成：按名称简单的数据结构，并反复容易处理

Pros: simple data structure and toggling by name is easy to handle

缺点：添加/删除是很麻烦的两个列表（输入和选择）必须进行管理。

Cons: add/remove is cumbersome as two lists (the input and selection) have to be managed

在HTML可能看起来像：

the html could look like:

<label ng-repeat="fruit in fruits">
  <!--
    - use `value="{{fruit.name}}"` to give the input a real value, in case the form gets submitted
      traditionally

    - use `ng-checked="fruit.selected"` to have the checkbox checked based on some angular expression
      (no two-way-data-binding)

    - use `ng-model="fruit.selected"` to utilize two-way-data-binding. Note that `.selected`
      is arbitrary. The property name could be anything and will be created on the object if not present.
  -->
  <input
    type="checkbox"
    name="selectedFruits[]"
    value="{{fruit.name}}"
    ng-model="fruit.selected"
  > {{fruit.name}}
</label>

和适当的控制器code将是：

and the appropriate controller code would be:

app.controller('ObjectArrayCtrl', ['$scope', 'filterFilter', function ObjectArrayCtrl($scope, filterFilter) {
  // fruits
  $scope.fruits = [
    { name: 'apple',    selected: true },
    { name: 'orange',   selected: false },
    { name: 'pear',     selected: true },
    { name: 'naartjie', selected: false }
  ];

  // selected fruits
  $scope.selection = [];

  // helper method to get selected fruits
  $scope.selectedFruits = function selectedFruits() {
    return filterFilter($scope.fruits, { selected: true });
  };

  // watch fruits for changes
  $scope.$watch('fruits|filter:{selected:true}', function (nv) {
    $scope.selection = nv.map(function (fruit) {
      return fruit.name;
    });
  }, true);
}]);

赞成：添加/删除是很容易的。

Pros: add/remove is very easy

缺点：较为复杂的数据结构，并反复用的名字是累赘还是需要一个助手方法

Cons: somewhat more complex data structure and toggling by name is cumbersome or requires a helper method

演示： http://jsbin.com/ImAqUC/1/

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