How to Bind Multiple Checkbox Values to a List in AngularJS?

How to Bind to a List of Checkbox Values in AngularJS?

Introduction

When dealing with a set of checkboxes, it can be crucial to bind their values to a list in the controller for effective management. However, AngularJS's ng-model property seems to be limited to binding a single checkbox value. This article explores two approaches to resolving this issue, leveraging either a simple array or an array of objects as input data.

Approach 1: Simple Array

HTML:

<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>

Controller:

app.controller('SimpleArrayCtrl', ['$scope', function SimpleArrayCtrl($scope) {

  // Fruits
  $scope.fruits = ['apple', 'orange', 'pear', 'naartjie'];

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

  // Toggle selection
  $scope.toggleSelection = function toggleSelection(fruitName) {
    var idx = $scope.selection.indexOf(fruitName);

    if (idx > -1) {
      $scope.selection.splice(idx, 1);
    } else {
      $scope.selection.push(fruitName);
    }
  };
}]);

Pros:

• Simple data structure
• Easy toggling by name

Cons:

• Cumbersome add/remove operations

Approach 2: Object Array

HTML:

<label ng-repeat="fruit in fruits">
  <input
    type="checkbox"
    name="selectedFruits[]"
    value="{{fruit.name}}"
    ng-model="fruit.selected"
  > {{fruit.name}}
</label>

Controller:

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 for 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);
}]);

Pros:

• Easy add/remove operations

Cons:

• More complex data structure
• Cumbersome toggling by name

Demo: http://jsbin.com/ImAqUC/1/

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