Unable to display HTML content using a custom directive

Question

Unable to display HTML content using a custom directive

Exploring the world of Angular directives, I am attempting to create a directive that can generate dynamic HTML elements. Let's take a look at the following code snippet:

<body ng-app="myApp" ng-controller="myCtrl">
    <my-directive></my-directive>
</body>

The desired outcome would be:

<span>My HTML<span>

Accompanied by this CSS style:

span {
  color:blue;
}

Here is my directive implementation:

myApp.directive("myDirective", ['$sce', function($sce) {
  return {
    restrict: "E",
    scope: {
      text: "="
    },
    template: '{{test}}',
    replace: true,
    transclude: false,
    link: function(scope, element, attrs) {
        scope.test  = "<span>My HTML<span>";
    }
  }
}]);

I have made multiple attempts but none have been successful. You can view my CodePen example. Any help or guidance on what I may be missing would be greatly appreciated. I suspect it could be related to using HTML content, so I attempted to utilize $sce without success.

Edit: I have also added CSS styling for the span tag. Once everything works, the text should appear in blue color.

javascript angularjs angular-directive

Answer 1

Answer №1

The preferred practice is to bind variables to the scope of your controller instead of the directive's scope. It is recommended to minimize the use of $scope as much as possible.

Example in index.html:

<body ng-app="myApp">
    <my-directive></my-directive>
</body>

Controller example:

myApp.controller("myCtrl", function() {
  var vm = this;
  vm.test = "Test";
});

And for the directive:

myApp.directive("myDirective", ['$sce', function($sce) {
  return {
    restrict: "E",
    template: '<span>{{vm.test}}</span>',
    replace: true,
    controller: "myCtrl",
    controllerAs: "vm"
  }
}]);

Note that the variable "test" is directly bound to the controller. The controller is referenced in the directive using "controller" and "controllerAs".

Let me know if you find this helpful.

EDIT: If you need to assign a variable value inside the link method, you can try this:

myApp.directive("myDirective", ['$sce', function($sce) {
  return {
    restrict: "E",
    scope: {
      text: "@"
    },
    replace: true,
    transclude: true,
    template: '<span ng-bind="text"></span>',
    link: function(scope, element, attrs){
        scope.text = "<span>...</span>";
    }
  }
}]);

Some key points to remember:

scope.text: "=" should be used when getting the text prop from the HTML element
Use "@" if assigning it inside the directive
Variables defined inside the scope are referred to by their variable names only within the template
Directives always require a single root element in the template
ng-bind or ng-bind-html (with $sceProvider) can be used to bind dynamic HTML to the root element

Answer 2

The preferred practice is to bind variables to the scope of your controller instead of the directive's scope. It is recommended to minimize the use of $scope as much as possible.

Example in index.html:

<body ng-app="myApp">
    <my-directive></my-directive>
</body>

Controller example:

myApp.controller("myCtrl", function() {
  var vm = this;
  vm.test = "Test";
});

And for the directive:

myApp.directive("myDirective", ['$sce', function($sce) {
  return {
    restrict: "E",
    template: '<span>{{vm.test}}</span>',
    replace: true,
    controller: "myCtrl",
    controllerAs: "vm"
  }
}]);

Note that the variable "test" is directly bound to the controller. The controller is referenced in the directive using "controller" and "controllerAs".

Let me know if you find this helpful.

EDIT: If you need to assign a variable value inside the link method, you can try this:

myApp.directive("myDirective", ['$sce', function($sce) {
  return {
    restrict: "E",
    scope: {
      text: "@"
    },
    replace: true,
    transclude: true,
    template: '<span ng-bind="text"></span>',
    link: function(scope, element, attrs){
        scope.text = "<span>...</span>";
    }
  }
}]);

Some key points to remember:

scope.text: "=" should be used when getting the text prop from the HTML element
Use "@" if assigning it inside the directive
Variables defined inside the scope are referred to by their variable names only within the template
Directives always require a single root element in the template
ng-bind or ng-bind-html (with $sceProvider) can be used to bind dynamic HTML to the root element

Unable to display HTML content using a custom directive

Answer №1

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