AngularJS : ng-controller on directive does not work on transcluded elements within directive
Question
Here is my script:
angular.module('MyApp',[])
.directive('mySalutation',function(){
return {
restrict:'E',
scope:true,
replace:true,
transclude:true,
template:'<div>Hello<div ng-transclude></div></div>',
link:function($scope,$element,$attrs){
}
};
})
.controller('SalutationController',['$scope',function($scope){
$scope.target = "StackOverflow";
}])
and the html:
<body ng-app="MyApp">
<my-salutation ng-controller="SalutationController">
<strong>{{target}}</strong>
</my-salutation>
</body>
The problem is , when SalutationController is applied on my-salutation directive, $scope.target is not visible for transcluded element.But if I put ng-controller on <body> or on <strong> element, it works. As docs says, ng-controller creates new scope.
Who can explain, how that scope and the scope of the directive are interfering with each other in this case?
How can I put controller on directive? Any hints will be appreciated.
2 answers
solution1
9 ACCPTED 2014-03-22 09:11:31
1) The problem is ng-transclude 's scope is the sibling scope of your directive. When you put the ng-controller to a parent element, the scope created by ng-controller is parent scope of both your directive and ng-transclude . Due to scope inheritance, the transcluded element is able to bind the {{target}} correctly.
2) You could do that using custom transclusion to bind the scope yourself
.directive('mySalutation',function(){
return {
restrict:'E',
scope:true,
replace:true,
transclude:true,
template:'<div>Hello<div class="transclude"></div></div>',
compile: function (element, attr, linker) {
return function (scope, element, attr) {
linker(scope, function(clone){
element.find(".transclude").append(clone); // add to DOM
});
};
}
};
})
Or using the transclude function in the link function:
.directive('mySalutation',function(){
return {
restrict:'E',
scope:true,
replace:true,
transclude:true,
template:'<div>Hello<div class="transclude"></div></div>',
link: function (scope, element, attr,controller, linker) {
linker(scope, function(clone){
element.find(".transclude").append(clone); // add to DOM
});
}
};
})
solution2
2 2014-03-22 09:16:40
To have the same scope for the directive, and the controller, you can invoke the transcludeFn manually:
angular.module('MyApp',[])
.directive('mySalutation',function(){
return {
restrict:'E',
scope:true,
replace:true,
transclude:true,
template:'<div>Hello<div class="trans"></div></div>',
link:function(scope, tElement, iAttrs, controller, transcludeFn){
console.log(scope.$id);
transcludeFn(scope, function cloneConnectFn(cElement) {
tElement.after(cElement);
});
}
};
})
.controller('SalutationController',['$scope',function($scope){
console.log($scope.$id);
$scope.target = "StackOverflow";
}]);
You can see that '003' is logged out every time, and your code works as expected with this minor adjustment.
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