Using service inside directive? - javascript

I am learning how to create custom directives.
My service looks like that:
myApp.service('myService',function(){
this.myFunction=function(myParam){
// do something
}
});
Here is my directive:
myApp.directive('myDirective',function(myService){
return {
restrict: 'E',
scope: {
param: '=myParam',
},
template: '<button ng-click="myService.myFunction(param)">Do action</button>',
}
});
In HTML, when I use <my-directive my-param="something"></my-directive> it properly renders as a button. However when I click it, myService.myFunction, doesn't get executed.
I suppose I am doing something wrong. Can someone give me a direction?
I guess this has something to do with the directive's scope.

The service wont be available directly inside the template. You'll have to use a function attached to the directive's scope and call the service function from within this function.
myApp.directive('myDirective',function(myService){
return {
restrict: 'E',
scope: {
param: '=myParam',
},
template: '<button ng-click="callService(param)">Do action</button>',
link: function(scope, element, attrs) {
scope.callService = function() {
myService.myFunction();
}
}
}
});

It doesn't work because in your example a directive doesn't actually know what is myService. You have to explicitly inject it e.g.:
myApp.directive('myDirective', ['myService', function(myService){ ... }]);
See also this question or this question.

You should use a controller to do all DOM-modifications.
See this plunkr: https://plnkr.co/edit/HbfD1EzS0av5BG6NgtIv?p=preview
.directive('myFirstDirective', [function() {
return {
'restrict': 'E',
'controller': 'MyFirstController',
'controllerAs': 'myFirstCtrl',
'template': '<h1>First directive</h1><input type="text" ng-model="myFirstCtrl.value">'
};
}

You can inject the service in the controller and then call that function inside your template:
Inject myService into controller:
myApp.controller("ctrl", function($scope, myService) {
$scope.doService = function(myParam) {
return myService.myFunction(myParam);
};
});
Call doService method of the controller inside your template:
myApp.directive('myDirective',function(){
return {
restrict: 'E',
scope: {
param: '=myParam',
},
template: '<button ng-click="doService(param)">Do action</button>',
}
});

Related

How to pass a value into a directives controller in angular?

My directive has a controller and I am trying to figure out how to pass a value from the directive that was passed in. In the example below 'name' is not valid posted to the console but it shows in the html when rendered. Obviously my example is an over simplication, but you get the point.
angular.module('myApp')
.directive('helpLabel', function() {
return {
restrict: 'E',
scope: {
name: '#',
},
template: '<span>{{name}}</span>',
controller: function ($scope) {
console.log(name);
}
};
});
<helpLabel name="test"></helpLabel>
The answer I found is to use bindToController along with controllerAs now effective angular 1.4.
angular.module('myApp')
.directive('helpLabel', function() {
return {
restrict: 'E',
scope:{},
bindToConroller: {
name: '#',
},
template: '<span>{{cntrl.name}}</span>',
controller: function () {
console.log(cntrl.name);
},
controllerAs: "cntrl"
};
});
http://blog.thoughtram.io/angularjs/2015/01/02/exploring-angular-1.3-bindToController.html
This is because when it is being rendered to the html, you encapsulated name within {{}}. If you wan't to access the name property within your directive you have to change your code.
angular.module('myApp')
.directive('helpLabel', function() {
return {
restrict: 'E',
scope: {
name: '#',
},
template: '<span>{{name}}</span>',
controller: function ($scope) {
console.log($scope.name);
}
};
});
In your code, console.log(name);, the variable name is not known your directive and hence not able to access it, but since angular has done binding to 'name' variable, it can render {{name}}.
You should access variable name as $scope.name as variable name is present inside current scope.
Modify your code as follow:
angular.module('myApp')
.directive('helpLabel', function() {
return {
restrict: 'E',
scope: {
name: '#',
},
template: '<span>{{name}}</span>',
controller: function ($scope) {
console.log($scope.name);
}
};
});

Proper "Angular" way to pass behavior to directive?

When looking for information regarding Angular directives and passing behavior to directives, I get ended up being pointed in the direction of method binding on an isolate scope, i.e.
scope: {
something: '&'
}
The documentation for this functionality is a bit confusing, and I don't think it'll end up doing what I want.
I ended up coming up with this snippet (simplified for brevity), that works by passing a scope function in HomeCtrl, and the directive does it's work and calls the function. (Just incase it matters, the real code passes back a promise from the directive).
angular.module('app', []);
angular.module('app')
.directive('passingFunction',
function() {
var changeFn,
bump = function() {
console.log('bump() called');
internalValue++;
(changeFn || Function.prototype)(internalValue);
},
internalValue = 42;
return {
template: '<button ng-click="bump()">Click me!</button>',
scope: {
onChange: '<'
},
link: function(scope, element, attrs) {
if (angular.isFunction(scope.onChange)) {
changeFn = scope.onChange;
}
scope.bump = bump;
}
};
})
.controller('HomeCtrl',
function($scope) {
$scope.receive = function(value) {
console.log('receive() called');
$scope.receivedData = value;
};
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.4/angular.min.js"></script>
<div ng-app="app" ng-controller="HomeCtrl">
<passing-function on-change="receive"></passing-function>
<p>Data from directive: {{receivedData}}</p>
</div>
Is this a proper "Angular" way of achieving this? This seems to work.
What you need is to pass the function to the directive. I'll make a very small example.
On controller:
$scope.thisFn = thisFn(data) { console.log(data); };
In html:
<my-directive passed-fn="thisFn()"></my-directive>
On directive:
.directive('myDirective', [
() => {
return {
restrict: 'E',
scope: {
passFn: '&'
},
template: '<div id="myDiv" ng-click="passFn(data)"></div>',
link: (scope) => {
scope.data = "test";
}
}
}]);

Call function defined in isolated scope in directive

Am I missing something here?
Shouldn't I be able to access the function showHelp() from the template ng-click ?
I've been fighting with this for hours and I can't get it right
angular.module('starter.directives', [])
.directive('errorMessage', function() {
return {
restrict: 'E',
require: '^form',
scope: true,
template:'<button ng-click="showHelp()" class="button icon ion-android-alert button-outline button-assertive"></button>',
link: function(scope, element, attrs, formCtrl) {
scope.showHelp = function(){
console.log('hello');
}
}
};
});
There's nothing wrong with your code. I am guessing you just forgot to include the module in your HTML. Something that looks like
<div ng-app="starter.directives">
....
</div>
Here's your code that is working properly in jsFiddle
You should add it in controller not link function. link function runs after everything was rendered.
angular.module('starter.directives').directive('errorMessage', function() {
return {
restrict: 'E',
scope: true,
template:'<button ng-click="showHelp()" class="button icon ion-android-alert button-outline button-assertive">Test</button>',
controller: function($scope) {
$scope.showHelp = function(){
console.log('hello');
}
}
};
});
I think the problem is that you reinitialize your module by passing [] here
angular.module('starter.directives', []) If you pass a second parameter to angular.module, it would think that you pass an array of dependecies and will reinit the module.

AngularJS - accessing the directive object inside the controller

Let's say that I have define a simple directive:
app.directive('someDirective', [function() {
return {
restrict: 'E',
link: function() {
},
controller: [function() {
// Access directive object here...
}]
}
}]);
Can I access the generated someDirective object inside someDirective's controller function? I know that the this property reference the directive object inside the compile and template functions, but i don't know how to access the directive object inside the controller function. Any tricks?
Thanks.
Sure you can, not sure why you'd want too though...
app.directive('someDirective', [function() {
var directiveObject = {
restrict: 'E',
link: function() {
},
controller: [function() {
// Access directive object here...
directiveObject.whatever
}]
}
return directiveObject;
}]);

Inject a variable into an Angular Controller from a Angular Directive

Updating as there is some confusion as to what I am asking. I would like to use a directive to inject a variable into the controller used by that directive. I realize I can use the $scope for that, but I don't find that an intuitive solution.
Essentially I want my controller to have the proposal variable injected into it.
My intended usage:
<blah-directive proposal="proposal"></blah-directive>
The directive (so far):
app.directive('blahDirective', function () {
return {
restrict: 'E'
, transclude: true
, replace: true
, scope: {
proposal: '='
}
, templateUrl: 'blahTemp.html'
, controller: blahController
};
});
blahTemp.html
<form class="form-horizontal" role="form" name="myBidForm">
**{{ proposal }}**
</form>
this is displaying the value proposal variable in the $scope fine, but it is not what I want. Essentially I would like to define my controller like:
var blahController = function($scope, SomeOtherResource, proposal) {
}
If you want to inject locals into a controller use $controller.
Here is an example (plunker):
app.directive('blahDirective', function ($controller) {
return {
restrict: 'E',
scope: {
proposal : "="
},
transclude: true,
replace: true,
templateUrl: 'blahTemp.html',
link : function (scope, elm, attrs){
scope.proposal = {};
var locals = {
$scope: scope ,
proposal: scope.proposal
};
$controller('blahController', locals);
}
};
});

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