Using functions from directive controller within link function of same directive
Both controller's $scope (defined in the controller, not in the sayHi
function) and link scope
are the same. Setting something in the controller will be usable from the link or viceversa.
The problem you have is that sayHi
is a function that is never fired so myVar
is never set.
Since sayHi
is not in the scope, you need a reference to the controller and to do it, you can add a fourth parameter like this:
link: function(scope, element, attr, ctrl) {}
Then you could do a ctrl.sayHi()
(But again, those params of sayHi
belongs to the controller function.)
If you ever need to require another controller and still wanting to use its own directive, then you will need to require it too. So if this coolDirective
needs to access to the controller of notCoolAtAll
you could do:
require: ['coolDirective', 'notCoolAtAll']
That will do the trick. The link
function will receive then an array of controllers as the fourth param and in this case the first element will be coolDirective
ctrl and the second one the notCoolAtAll
one.
Here is a little example: http://plnkr.co/edit/JXahWE43H3biouygmnOX?p=preview
Melbourne2991
Updated on July 13, 2020Comments
-
Melbourne2991 almost 4 years
Perhaps I have a fundamental misunderstanding of how directive controllers work, from what I understand they are used as a sort of API to be exposed to other directives & controllers. I am trying to get the controller and link function to communicate internally.
For example I would like to be able to set a variable via the controller function and then use it in the link function:
var app = angular.module('test-app', []); app.directive('coolDirective', function () { return { controller: function () { this.sayHi = function($scope, $element, $attrs) { $scope.myVar = "yo" } }, link: function(scope, el, attrs) { console.log(scope.myVar); } } });
How can I access myVar or sayHi within the link function? Or have I just missed the point completely?
-
Melbourne2991 over 10 yearsperfect thanks heaps, makes much more sense to me now!
-
dsdsdsdsd over 8 yearshello ... if I add
console.log( scope.name ) ;
within your link function, it returnsundefined
... how can I access MainCtrl's.name
property ... thanks ... (see forked plunker: plnkr.co/edit/STVVT5Vj9tkV9t0LFxKu?p=preview) -
Buddybear over 7 yearsPerfect answer. Not able to figure out how to do until I see your answer :)
-
Aashish Kumar over 2 yearsIs there any way to access the "element" variable from link function in the controller??