Tips for implementing ngChange within a personalized directive

Question

Tips for implementing ngChange within a personalized directive

Looking to create a directive for a toggle button, here is the code I want to include in the directive:

<div class="toggle-button" ng-class="{true: toggleTrue === true, false: toggleTrue === false}">
    <button class="true" ng-click="toggleTrue = true">Y</button><button class="false" ng-click="toggleTrue = false">N</button>
</div>

(My focus is on style changes only, hence only the class change)

I am hoping for something like:

<toogle ng-change="SomeFunction()" ng-model="someValue" />

How can I utilize ng-change in my directive? Should I simply parse the attribute or use a scope attribute, or is there a code similar to ngModel that needs to be used in conjunction with ngChange.

javascript angularjs angularjs-directive

Answer 1

Answer №1

After experimenting with different approaches, I finally discovered a code snippet that effectively utilizes both ngModel and ngChange:

return {
    restrict: 'E',
    require: 'ngModel',
    scope: {},
    template: '<div class="toggle-button" ng-class="{true: toggleValue === true, false: toggleValue === false}">'+
        '<button class="true" ng-click="toggle(true)">Y</button>'+
        '<button class="false" ng-click="toggle(false)">N</button>'+
        '</div>',
    link: function(scope, element, attrs, ngModel) {
        ngModel.$viewChangeListeners.push(function() {
            scope.$eval(attrs.ngChange);
        });
        ngModel.$render = function() {
            scope.toggleValue = ngModel.$modelValue;
        };
        scope.toggle = function(toggle) {
            scope.toggleValue = toggle;
            ngModel.$setViewValue(toggle);
        };
    }
};

Interestingly, scope: true did not work as expected (when using $scope.toggle variable as a model, it attempted to interpret the boolean value instead of treating it as a function).

Answer 2

After experimenting with different approaches, I finally discovered a code snippet that effectively utilizes both ngModel and ngChange:

return {
    restrict: 'E',
    require: 'ngModel',
    scope: {},
    template: '<div class="toggle-button" ng-class="{true: toggleValue === true, false: toggleValue === false}">'+
        '<button class="true" ng-click="toggle(true)">Y</button>'+
        '<button class="false" ng-click="toggle(false)">N</button>'+
        '</div>',
    link: function(scope, element, attrs, ngModel) {
        ngModel.$viewChangeListeners.push(function() {
            scope.$eval(attrs.ngChange);
        });
        ngModel.$render = function() {
            scope.toggleValue = ngModel.$modelValue;
        };
        scope.toggle = function(toggle) {
            scope.toggleValue = toggle;
            ngModel.$setViewValue(toggle);
        };
    }
};

Interestingly, scope: true did not work as expected (when using $scope.toggle variable as a model, it attempted to interpret the boolean value instead of treating it as a function).

Answer 3

Answer №2

Consider approaching it this manner:

controller:

$scope.handleFunction = function(){...};
$scope.switchValue = false;

view:

<toggle switch="handleFunction" value="switchValue"/>

directive (for scenarios where switchValue is always either true or false):

app.directive('toggle', function(){
    return{
        restrict: 'E',
        replace: true,
        template: ''+ 
            '<div class="toggle-switch" ng-class="toggleValue">'+
                '<button ng-class="toggleValue" ng-click="switch()">{{toggleValue&&\'On\'||\'Off\'}}</button>'+
            '</div>',
        scope: {
            toggleValue: '=value',
            toggleSwitch: '=switch'
        },
        link: function(scope){
            scope.switch = function(){
                scope.toggleValue = !scope.toggleValue;
                scope.toggleSwitch();
            }
        }
    };
})

Answer 4

Consider approaching it this manner:

controller:

$scope.handleFunction = function(){...};
$scope.switchValue = false;

view:

<toggle switch="handleFunction" value="switchValue"/>

directive (for scenarios where switchValue is always either true or false):

app.directive('toggle', function(){
    return{
        restrict: 'E',
        replace: true,
        template: ''+ 
            '<div class="toggle-switch" ng-class="toggleValue">'+
                '<button ng-class="toggleValue" ng-click="switch()">{{toggleValue&&\'On\'||\'Off\'}}</button>'+
            '</div>',
        scope: {
            toggleValue: '=value',
            toggleSwitch: '=switch'
        },
        link: function(scope){
            scope.switch = function(){
                scope.toggleValue = !scope.toggleValue;
                scope.toggleSwitch();
            }
        }
    };
})

Tips for implementing ngChange within a personalized directive

Answer №1

Answer №2

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