Binding a Directive Controller's method to its parent $scope - javascript

I will explain what exactly I'm trying to do before explaining the issue. I have a Directive which holds a form, and I need to access that form from the parent element (where the Directive is used) when clicking on a submit button to check fi the form is valid.
To do this, I am trying to use $scope.$parent[$attrs.directiveName] = this; and then binding some methods to the the Directive such as this.isValid which will be exposed and executable in the parent.
This works fine when running locally, but when minifying and building my code (Yeoman angular-fullstack) I will get an error for aProvider being unknown which I traced back to a $scopeProvider error in the Controller.
I've had similar issues in the past, and my first thought was that I need to specifically say $inject for $scope so that the name isn't lost. But alas.....no luck.
Is something glaringly obvious that I am doing wrong?
Any help appreciated.
(function() {
'use strict';
angular
.module('myApp')
.directive('formDirective', formDirective);
function formDirective() {
var directive = {
templateUrl: 'path/to/template.html',
restrict: 'EA',
scope: {
user: '='
},
controller: controller
};
return directive;
controller.$inject = ['$scope', '$attrs', 'myService'];
function controller($scope, $attrs, myService) {
$scope.myService = myService;
// Exposes the Directive Controller on the parent Scope with name Directive's name
$scope.$parent[$attrs.directiveName] = this;
this.isValid = function() {
return $scope.myForm.$valid;
};
this.setDirty = function() {
Object.keys($scope.myForm).forEach(function(key) {
if (!key.match(/\$/)) {
$scope.myForm[key].$setDirty();
$scope.myForm[key].$setTouched();
}
});
$scope.myForm.$setDirty();
};
}
}
})();

Change the directive to a component and implement a clear interface.
Parent Container (parent.html):
<form-component some-input="importantInfo" on-update="someFunction(data)">
</form-component>
Parent controller (parent.js):
//...
$scope.importantInfo = {data: 'data...'};
$scope.someFunction = function (data) {
//do stuff with the data
}
//..
form-component.js:
angular.module('app')
.component('formComponent', {
template:'<template-etc>',
controller: Controller,
controllerAs: 'ctrl',
bindings: {
onUpdate: '&',
someInput: '<'
}
});
function Controller() {
var ctrl = this;
ctrl.someFormThing = function (value) {
ctrl.onUpdate({data: value})
}
}
So if an event in your form triggers the function ctrl.someFormThing(data). This can be passed up to the parent by calling ctrl.onUpdate().

Related

AngularJS rootScope.$emit from within Directive

I have a directive for users to like (or "fave") posts in my application. Throughout my controllers I use $rootScope.$emit('name-of-function', some-id) to update user data when they like a new post, as this is reflected throughout my application. But I can't seem to use $rootScope.$emit in the directive. I receive an error
$rootScope.$emit is not a function
Presumably the $rootScope.$on event which corresponds with this command has not been called yet, so this function does not yet exist? What can be done about this? Is there a better way to arrange this?
var module = angular.module('directives.module');
module.directive('postFave', function (contentService, $rootScope) {
return {
restrict: 'E',
templateUrl: 'directives/post-fave.html',
scope: {
contentId: '#',
slug: '#'
},
link: function ($scope, $rootScope, element) {
$scope.contentFavToggle = function (ev) {
contentId = $scope.contentId;
contentService.contentFavToggle(contentId, ev).then(function (response) {
$rootScope.$emit('dataUpdated', $scope.slug);
if (response) {
$scope.favourite[contentId] = response;
} else {
$scope.favourite[contentId] = null;
}
});
};
console.log("track fave directive called");
}
};
});
from controller:
var dataUpdatedListener = $rootScope.$on('dataUpdated', function (event, slug) {
dataService.clearData(slug);
dataControllerInit();
});
How can I access this rootscope function from within the directive? Thanks.
FYI - "link" has been used in the directive because this is related to an instance of an HTML element which will be used a number of times on the page
link has the following signature, there is no need to add $rootScope injection into link function:
function link(scope, element, attrs, controller, transcludeFn) { ... }
Remove it from link and it will work.

How to get access to controller function from directive in AngularJS

So, this is my controller with some tiny function:
class DashboardCtrl {
constructor ($scope, $stateParams) {
"ngInject";
this.$scope = $scope;
this.title = 'Dashboard';
}
loadCharts () {
// some logic here
}
}
export default DashboardCtrl;
And now my directive:
class TreeNodeTooltip {
constructor ($scope, $state) {
"ngInject";
this.$scope = $scope;
this.$state = $state;
this.scope = {
loadCharts: '&'
};
}
link (scope, elem, attrs) {
$(elem).on('click', '.node-name', (e) => {
console.log(this.$scope.loadCharts());
console.log(this.scope.loadCharts());
console.log(this.$scope.main.loadCharts());
}
}
}
This is not working, i've tried couple of ways but ... How to get access to controller from directive, to controller function? Thx for help.
I think you are not fully understanding what Angular's .directive() is doing. It is not registering class for directive instances, but it is registering directive factory class.
I guess that TreeNodeTooltip from your question is what you register as the directive factory. In that case $injector can inject services in the constructor, but not any actual $scope (not sure how it is possible you are not getting error from that).
The actual directive instance is being initialized through the postLink / link function. There you also have directive's scope available. However you are accessing scope from the directive definition this.scope and that does not make sense.
The following modification provides a bit sense to the provided code:
class TreeNodeTooltip {
constructor () {
this.scope = {
loadCharts: '&'
};
}
link (scope, elem, attrs) {
$(elem).on('click', '.node-name', (e) => {
console.log(scope.loadCharts());
}
}
}
And then in the template:
<!-- ngController only required if it is not registered as state controller -->
<div ng-controller="DashboardCtrl as dashboardCtrl">
<tree-node-tooltip load-charts="dashboardCtrl.loadCharts()" />
</div>

Passing data from controller to directive

I 'm trying to handle data that is coming from my database in a directive , however these data are being pulled by a controller and being assigned to scope like this:
Calendar Controller:
'use strict';
var CalendarController = ['$scope', 'EventModel', function(scope, EventModel) {
scope.retrieve = (function() {
EventModel.Model.find()
.then(function(result) {
scope.events = result;
}, function() {
});
}());
}];
adminApp.controller('CalendarController', CalendarController);
Calendar Directive:
'use strict';
var calendarDirective = [function($scope) {
var Calendar = {
init: function(events) {
console.log(events);
}
};
return {
link: function(scope) {
Calendar.init(scope.events);
}
};
}];
adminApp.directive('calendarDirective', calendarDirective);
But the data is undefined in the directive, and in the controller the data appears to be ok.
Thanks!
This is a common error for people starting out with AngularJS. This is a load order issue. The events scope variable is not defined when the directive link function is executed. One solution is to use a watch on the variable passed into the directive and load once it is defined.
return {
link: function(scope) {
scope.$watch('events', function() {
if(scope.events === undefined) return;
Calendar.init(scope.events);
});
}
};
In the above scenario controller and directives have isolated scope. One solution will be to use factory/service to communicate with the server and inject the service to controller and directive. Since service/factory is singleton you can cache the data & share is between controllers & directives.
try this way.
Directive html
<calendar-directive objEvent="events" ></calendar-directive >
JS :
'use strict';
var calendarDirective = [function($scope) {
return {
scope : { objEvent : '=objEvent'}
template: '<div>{{ objEvent }}</div>',
};
}];
Use angular isolated scopes.

AngularJS: How do I call a function defined in a directive's scope from a controller?

I need to call a function which belongs to the $scope of a ng-directive used in my Angular application.
Let's say the directive is defined like this:
.directive('my-directive', ['$document', '$timeout', function ($document, $timeout) {
return {
restrict: 'E',
replace: true,
scope: {
// ....
},
controller: ['$scope', function ($scope) {
$scope.myFunction= function (mouseEnter) {
// ...
};
}
};
}]);
I need to call myFunction from my controller (let's call it my-controller) which is the controller of the view where my directive is placed.
Is it possible to do it? (eventually modifying the directive)
EDIT : The already answered question provided (proposed for edit) is similar to mine by it's not clear to me or it doesn't apparently solve the specific problem I proposed.
EDIT 2: starting from Dan M. answer (without taking mouseenter/mouseleave in consideration. just trying to make the two controllers communicate with each other), I broadcasted my event to my directive's controller through $rootScope (as there is there is no parent-child relation between the two controllers) by:
console.log("let's broadcast the event.."); // this is printed
$rootScope.$broadcast('callDirectiveControllersFunction'); // I even tried with $scope in place of $rootScope and $emit in place of $broadcast
and by receving it (within the directive's controller) by:
var myFunction = function(){
// ...
}
$scope.$on('callDirectiveControllersFunction', function (){
console.log("event received"); // this is not printed
callMyFunction();
});
// I even tried using $rootScope in place of $scope
However in no case (see comments in code) the event is received
You can call a controller function inside the link block. You can also $emit an event in the directive and listen to the it in the controller (maybe there is a use case for that).
It seems that you want to call it on mouseenter. You can do that by binding to the mouseenter event in the directive link. The catch is you need to $apply the changes.
Take a look at the following piece of code, which contains all 3 examples: http://jsbin.com/cuvugu/8/. (also pasted below)
Tip: You might want to pay attention to how you name your directives. To use a directive as my-directive you need to name it as myDirective.
var app = angular.module('App', []);
app.directive('myDirective', function () {
function directiveLink(scope){
scope.$emit('customEvent');
}
return {
restrict: 'EA',
scope: {},
link: directiveLink,
controller: function ($scope) {
$scope.bar = 'bar';
$scope.myFunction = function () {
$scope.bar = 'foobar1';
};
$scope.$on('customEvent', function (){
$scope.myFunction();
});
},
template: "Foo {{bar}}"
};
});
app.directive('anotherDirective', function () {
function directiveLink(scope){
scope.myFunction();
}
return {
restrict: 'EA',
scope: {},
link: directiveLink,
controller: function ($scope) {
$scope.bar = 'bar';
$scope.myFunction = function () {
$scope.bar = 'foobar2';
};
},
template: "Foo {{bar}}"
};
});
app.directive('mouseDirective', function () {
function directiveLink(scope, element){
element.bind('mouseenter', function(){
scope.$apply(function(){
scope.myFunction();
});
});
element.bind('mouseleave', function(){
scope.$apply(function(){
scope.myOtherFunction();
});
});
}
return {
restrict: 'EA',
link: directiveLink,
controller: function ($scope) {
$scope.bar = 'no';
$scope.myFunction = function () {
$scope.bar = 'yes';
};
$scope.myOtherFunction = function () {
$scope.bar = 'no';
};
},
template: "Mouse Enter: {{bar}}"
};
});
I also included an example with a distinct controller in the JS Bin link. That doesn't really change anything, but it seems to be an important part of your question. Here's the code block:
var app = angular.module('App', []);
app.controller('myController', function($scope){
$scope.bar = 'foo';
$scope.myFunction = function(){
$scope.bar = 'foobar3';
};
});
app.directive('lastDirective', function () {
function directiveLink(scope){
scope.myFunction();
}
return {
restrict: 'EA',
scope: {},
link: directiveLink,
controller: 'myController',
template: "Foo {{bar}}"
};
});

angular.js directive two-way-binding scope updating

I wanted to use a directive to have some click-to-edit functionality in my front end.
This is the directive I am using for that: http://icelab.com.au/articles/levelling-up-with-angularjs-building-a-reusable-click-to-edit-directive/
'use strict';
angular.module('jayMapApp')
.directive('clickToEdit', function () {
return {
templateUrl: 'directives/clickToEdit/clickToEdit.html',
restrict: 'A',
replace: true,
scope: {
value: '=clickToEdit',
method: '&onSave'
},
controller: function($scope, $attrs) {
$scope.view = {
editableValue: $scope.value,
editorEnabled: false
};
$scope.enableEditor = function() {
$scope.view.editorEnabled = true;
$scope.view.editableValue = $scope.value;
};
$scope.disableEditor = function() {
$scope.view.editorEnabled = false;
};
$scope.save = function() {
$scope.value = $scope.view.editableValue;
$scope.disableEditor();
$scope.method();
};
}
};
});
I added a second attribute to the directive to call a method after when the user changed the value and then update the database etc. The method (´$onSave´ here) is called fine, but it seems the parent scope is not yet updated when I call the method at the end of the directive.
Is there a way to call the method but have the parent scope updated for sure?
Thanks in advance,
Michael
I believe you are supposed to create the functions to attach inside the linking function:
Take a look at this code:
http://plnkr.co/edit/ZTx0xrOoQF3i93buJ279?p=preview
app.directive('clickToEdit', function () {
return {
templateUrl: 'clickToEdit.html',
restrict: 'A',
replace: true,
scope: {
value: '=clickToEdit',
method: '&onSave'
},
link: function(scope, element, attrs){
scope.save = function(){
console.log('save in link fired');
}
},
controller: function($scope, $attrs) {
$scope.view = {
editableValue: $scope.value,
editorEnabled: false
};
$scope.enableEditor = function() {
$scope.view.editorEnabled = true;
$scope.view.editableValue = $scope.value;
};
$scope.disableEditor = function() {
$scope.view.editorEnabled = false;
};
$scope.save = function() {
console.log('save in controller fired');
$scope.value = $scope.view.editableValue;
$scope.disableEditor();
$scope.method();
};
}
};
});
I haven't declared the functions inside the controller before, but I don't see why it wouldn't work.
Though this question/answer explain it Link vs compile vs controller
From my understanding:
The controller is used to share data between directive instances, not to "link" functions which would be run as callbacks.
The method is being called but angular doesn't realise it needs to run the digest cycle to update the controller scope. Luckily you can still trigger the digest from inside your isolate scope just wrap the call to the method:
$scope.$apply($scope.method());

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