I am creating reusable UI components with AngularJS directives. I would like to have a controller that contains my business logic with the nested components (directives). I want the directives to be able to manipulate a single property on the controller scope. The directives need to have an isolate scope because I might use the same directive more than once, and each instance needs to be bound to a particular controller scope property.
So far, the only way I can apply changes back to the controller's scope is to call scope.$apply() from the directive. But this breaks when I'm inside of an ng-click callback because of rootScope:inprog (scope operation in progress) errors.
So my question: What is the best way to make my controller aware when a child directive has updated a value on the controller's scope?
I've considered having a function on the controller that the directive could call to make an update, but that seems heavy to me.
Here is my code that breaks on an ng-click callback. Keep in mind that I don't just want to solve the ng-click issue. I want the best overall solution to apply reusable directives to modify a parent scope/model.
html
<div ng-controller="myCtrl">
<my-directive value="val1"></my-directive>
</div>
controller
...
.controller('myCtrl', ['$scope', function ($scope) {
$scope.val1 = 'something';
}});
directive
...
.directive('myDirective', [function () {
return {
link: function(scope) {
scope.buttonClick = function () {
var val = 'new value';
scope.value = val;
scope.$apply();
};
},
scope: {
value: '='
},
template: '<button ng-click="buttonClick()"></button>'
};
}]);
The purpose of two-way data binding in directives is exactly what you're asking about -- to "[allow] directives to modify a parent scope/model."
First, double-check that you have set up two-way data binding correctly on the directive attribute which exposes the variable you want to share between scopes. In the controller, you can use $watch to detect updates if you need to do something when the value changes. In addition, you have the option of adding an event-handler attribute to the directive. This allows the directive to call a function when something happens. Here's an example:
<div ng-controller="myCtrl">
<my-directive value="val1" on-val-change="myFunc"> <!-- Added on-change binding -->
<button ng-click="buttonClick()"></button>
</my-directive>
</div>
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