http://riedberg-edu.eu/components/vitalets/angular-xeditable/libs/checklist-model.js

1/**
2 * Checklist-model
3 * AngularJS directive for list of checkboxes
4 */
5
6angular.module('checklist-model', [])
7.directive('checklistModel', function($parse, $compile) {
8  // contains
9  function contains(arr, item) {
10    if (angular.isArray(arr)) {
11      for (var i = 0; i < arr.length; i++) {
12        if (angular.equals(arr[i], item)) {
13          return true;
14        }
15      }
16    }
17    return false;
18  }
19
20  // add
21  function add(arr, item) {
22    arr = angular.isArray(arr) ? arr : [];
23    for (var i = 0; i < arr.length; i++) {
24      if (angular.equals(arr[i], item)) {
25        return;
26      }
27    }    
28    arr.push(item);
29  }  
30
31  // remove
32  function remove(arr, item) {
33    if (angular.isArray(arr)) {
34      for (var i = 0; i < arr.length; i++) {
35        if (angular.equals(arr[i], item)) {
36          arr.splice(i, 1);
37          return;
38        }
39      }
40    }
41  }  
42
43  return {
44    restrict: 'A',
45    scope: true,
46    link: function(scope, elem, attrs) {
47      if (elem[0].tagName !== 'INPUT' || !elem.attr('type', 'checkbox')) {
48        throw 'checklist-model should be applied to `input[type="checkbox"]`.';
49      }
50
51      if (!attrs.checklistValue) {
52        throw 'You should provide  `checklist-value`.';
53      }
54
55      var modelGet = $parse(attrs.checklistModel);
56      var modelSet = modelGet.assign;
57      var model = modelGet(scope);
58      var value = $parse(attrs.checklistValue)(scope);
59
60      // local var storing individual checkbox model
61      scope.checked = contains(model, value);
62
63      // exclude recursion
64      elem.removeAttr('checklist-model');
65      elem.attr('ng-model', 'checked');
66      $compile(elem)(scope);
67
68      // watch UI checked change
69      scope.$watch('checked', function(newValue, oldValue) {
70        if (newValue === oldValue) { 
71          return;
72        } if (newValue === true) {
73          add(model, value);
74          modelSet(scope.$parent, model);
75        } else if (newValue === false) {
76          remove(model, value);
77          modelSet(scope.$parent, model);
78        }
79      });
80
81      // watch element destroy to remove from model
82      elem.bind('$destroy', function() {
83        remove(model, value);
84        modelSet(scope.$parent, model);
85      });      
86
87      // watch model change
88      scope.$watch(function ngModelWatch() {
89        var curModel = modelGet(scope);
90        if (model !== curModel) {
91          model = curModel;
92          scope.checked = contains(model, value);
93        }
94      });
95    }
96  };
97});