angularjs - is it not possible to add ng- attributes on a directive? - angularjs

Question

What I would like to be able to do is "wrap" the behavior of an ng-hide for a "permissions" directive... so I can do the following
Hide me
All is fine if I decide to simply "remove" the element from the dom; however, if I try to add an ng-hide and then recompile the element. Unfortunately, this causes an infinite loop
angular.module('my.permissions', []).
directive 'permit', ($compile) ->
priority: 1500
terminal: true
link: (scope, element, attrs) ->
element.attr 'ng-hide', 'true' # ultimately set based on the user's permissions
$compile(element)(scope)
OR
angular.module('my.permissions', []).directive('permit', function($compile) {
return {
priority: 1500,
terminal: true,
link: function(scope, element, attrs) {
element.attr('ng-hide', 'true'); // ultimately set based on the user's permissions
return $compile(element)(scope);
}
};
});
I've tried it without the priority or terminal to no avail. I've tried numerous other permutations (including removing the 'permit' attribute to prevent it from continually recompiling, but what it seems to come down to is this: there doesn't seem to be a way to modify an element's attributes and recompile inline through a directive.
I'm sure there's something I'm missing.

Answer 1

This solution assumes that you want to watch the changes of the permit attribute if it changes and hide the element as if it was using the ng-hide directive. One way to do this is to watch the permit attribute changes and then supply the appropriate logic if you need to hide or show the element. In order to hide and show the element, you can replicate how angular does it in the ng-hide directive in their source code.
directive('permit', ['$animate', function($animate) {
return {
restrict: 'A',
multiElement: true,
link: function(scope, element, attr) {
scope.$watch(attr.permit, function (value){
// do your logic here
var condition = true;
// this variable here should be manipulated in order to hide=true or show=false the element.
// You can use the value parameter as the value passed in the permit directive to determine
// if you want to hide the element or not.
$animate[condition ? 'addClass' : 'removeClass'](element, 'ng-hide');
// if you don't want to add any animation, you can simply remove the animation service
// and do this instead:
// element[condition? 'addClass': 'removeClass']('ng-hide');
});
}
};
}]);

Answer 2

angular.module('my.permissions', []).directive('permit', function($compile) {
return {
priority: 1500,
terminal: true,
link: function(scope, element, attrs) {
scope.$watch(function(){
var method = scope.$eval(attrs.permit) ? 'show' : 'hide';
element[method]();
});
}
};
});

Answer 3

I'm using this directive. This works like ng-if but it checks for permissions.
appModule.directive("ifPermission", ['$animate', function ($animate) {
return {
transclude: 'element',
priority: 600,
terminal: true,
restrict: 'A',
$$tlb: true,
link: function ($scope, $element, $attr, ctrl, $transclude) {
var block, childScope;
var requiredPermission = eval($attr.ifPermission);
// i'm using global object you can use factory or provider
if (window.currentUserPermissions.indexOf(requiredPermission) != -1) {
childScope = $scope.$new();
$transclude(childScope, function (clone) {
clone[clone.length++] = document.createComment(' end ifPermission: ' + $attr.ngIf + ' ');
// Note: We only need the first/last node of the cloned nodes.
// However, we need to keep the reference to the jqlite wrapper as it might be changed later
// by a directive with templateUrl when it's template arrives.
block = {
clone: clone
};
$animate.enter(clone, $element.parent(), $element);
});
}
}
};
}]);
usage:
<div if-permission="requiredPermission">Authorized content</div>