How directives are invoked If an element that contains a directive is added dynamically through an angular controller?

问题

After doing some search I haven't found much information in this bad practice. Let's say I have a controller that behaves like that (I know it should have been a directive and that in controllers we never do DOM manipulation but I am curious..)

angular.module('app').controller('test', ['$scope',
    function($scope) {
        $scope.addElement = function() {

            var input = document.createElement('input');
            input.type = "text";
            //directive
            input.setAttribute("autosize","autosize");
            input.setAttribute("ng-model","dummy");
            //[ append code ]
            input.focus();



        }
    }
]);

and let's assume that I have a button that triggers addElement() with ng-click. How the existing autosize directive will be "triggered" to actually work. In contrast input elements that preexist and have the autosize directive work fine. I also tried $scope.apply(function() { }); around the indented code that creates the input element and it causes TypeError: undefined is not a function :/

回答1:

Based on Mohammad Shahrouri's comment above, I had to inject the $compile dependency in the controller and I had to add $compile(input)($scope); at the end:

angular.module('app').controller('test', ['$scope','$compile',
    function($scope, $compile) {
        $scope.addElement = function() {

            var input = document.createElement('input');
            input.type = "text";
            //contains directive
            input.setAttribute("autosize","autosize");
            input.setAttribute("ng-model","dummy");
            //[ append code ]
            input.focus();
            $compile(input)($scope);

        }
    }
]);

来源：https://stackoverflow.com/questions/26447885/how-directives-are-invoked-if-an-element-that-contains-a-directive-is-added-dyna