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/**
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* Checklist-model
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* AngularJS directive for list of checkboxes
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* https://github.com/vitalets/checklist-model
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* License: MIT http://opensource.org/licenses/MIT
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*/
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/* commonjs package manager support (eg componentjs) */
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if (typeof module !== "undefined" && typeof exports !== "undefined" && module.exports === exports){
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module.exports = 'checklist-model';
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}
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angular.module('checklist-model', [])
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.directive('checklistModel', ['$parse', '$compile', function($parse, $compile) {
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// contains
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function contains(arr, item, comparator) {
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if (angular.isArray(arr)) {
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for (var i = arr.length; i--;) {
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if (comparator(arr[i], item)) {
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return true;
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}
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}
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}
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return false;
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}
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// add
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function add(arr, item, comparator) {
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arr = angular.isArray(arr) ? arr : [];
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if(!contains(arr, item, comparator)) {
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arr.push(item);
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}
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return arr;
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}
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// remove
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function remove(arr, item, comparator) {
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if (angular.isArray(arr)) {
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for (var i = arr.length; i--;) {
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if (comparator(arr[i], item)) {
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arr.splice(i, 1);
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break;
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}
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}
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}
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return arr;
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}
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// http://stackoverflow.com/a/19228302/1458162
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function postLinkFn(scope, elem, attrs) {
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// exclude recursion, but still keep the model
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var checklistModel = attrs.checklistModel;
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attrs.$set("checklistModel", null);
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// compile with `ng-model` pointing to `checked`
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$compile(elem)(scope);
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attrs.$set("checklistModel", checklistModel);
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// getter for original model
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var checklistModelGetter = $parse(checklistModel);
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var checklistChange = $parse(attrs.checklistChange);
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var checklistBeforeChange = $parse(attrs.checklistBeforeChange);
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var ngModelGetter = $parse(attrs.ngModel);
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var comparator = function (a, b) {
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if(!isNaN(a) && !isNaN(b)) {
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return String(a) === String(b);
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} else {
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return angular.equals(a,b);
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}
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};
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if (attrs.hasOwnProperty('checklistComparator')){
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if (attrs.checklistComparator[0] == '.') {
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var comparatorExpression = attrs.checklistComparator.substring(1);
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comparator = function (a, b) {
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return a[comparatorExpression] === b[comparatorExpression];
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};
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} else {
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comparator = $parse(attrs.checklistComparator)(scope.$parent);
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}
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}
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// watch UI checked change
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var unbindModel = scope.$watch(attrs.ngModel, function(newValue, oldValue) {
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if (newValue === oldValue) {
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return;
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}
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if (checklistBeforeChange && (checklistBeforeChange(scope) === false)) {
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ngModelGetter.assign(scope, contains(checklistModelGetter(scope.$parent), getChecklistValue(), comparator));
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return;
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}
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setValueInChecklistModel(getChecklistValue(), newValue);
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if (checklistChange) {
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checklistChange(scope);
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}
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});
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// watches for value change of checklistValue
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var unbindCheckListValue = scope.$watch(getChecklistValue, function(newValue, oldValue) {
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if( newValue != oldValue && angular.isDefined(oldValue) && scope[attrs.ngModel] === true ) {
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var current = checklistModelGetter(scope.$parent);
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checklistModelGetter.assign(scope.$parent, remove(current, oldValue, comparator));
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checklistModelGetter.assign(scope.$parent, add(current, newValue, comparator));
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}
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}, true);
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var unbindDestroy = scope.$on('$destroy', destroy);
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function destroy() {
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unbindModel();
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unbindCheckListValue();
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unbindDestroy();
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}
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function getChecklistValue() {
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return attrs.checklistValue ? $parse(attrs.checklistValue)(scope.$parent) : attrs.value;
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}
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function setValueInChecklistModel(value, checked) {
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var current = checklistModelGetter(scope.$parent);
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if (angular.isFunction(checklistModelGetter.assign)) {
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if (checked === true) {
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checklistModelGetter.assign(scope.$parent, add(current, value, comparator));
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} else {
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checklistModelGetter.assign(scope.$parent, remove(current, value, comparator));
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}
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}
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}
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// declare one function to be used for both $watch functions
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function setChecked(newArr, oldArr) {
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if (checklistBeforeChange && (checklistBeforeChange(scope) === false)) {
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setValueInChecklistModel(getChecklistValue(), ngModelGetter(scope));
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return;
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}
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ngModelGetter.assign(scope, contains(newArr, getChecklistValue(), comparator));
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}
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// watch original model change
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// use the faster $watchCollection method if it's available
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if (angular.isFunction(scope.$parent.$watchCollection)) {
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scope.$parent.$watchCollection(checklistModel, setChecked);
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} else {
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scope.$parent.$watch(checklistModel, setChecked, true);
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}
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}
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return {
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restrict: 'A',
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priority: 1000,
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terminal: true,
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scope: true,
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compile: function(tElement, tAttrs) {
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if (!tAttrs.checklistValue && !tAttrs.value) {
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throw 'You should provide `value` or `checklist-value`.';
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}
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// by default ngModel is 'checked', so we set it if not specified
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if (!tAttrs.ngModel) {
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// local scope var storing individual checkbox model
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tAttrs.$set("ngModel", "checked");
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}
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return postLinkFn;
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}
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};
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}]);
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