Directives scopes and inheritance

by Abdul Rawoof A R Updated: Mar 20, 2023

Guide Kit

Accessing any data in the parent scope requires passing the data at two places – the directive scope and the directive tag. The directive scope uses prefixes to achieve that. Using prefixes helps establish a two-way or one-way binding between parent and directive scopes and also makes calls to parent scope methods.

Why are directives used in Angular? Extended HTML attributes with the prefix ng- are the Angular directives, and the ng-app directive initializes an AngularJS application. The ng-init directive initializes application data. The ng-model directive binds the value of HTML controls (input, select, textarea) to application data. A component directive can be created multiple times. Every component in Angular will have a @Component decorator attached, while we cannot apply more than one structural directive to the same HTML element.

Directives are classes that add additional behavior to elements in your Angular applications. Use Angular's built-in directives to manage forms, lists, styles, and what users see.

Here is an example of how to implement directive scope and inheritance in Angular:

Fig: Preview of the output that you will get on running this code from your IDE.

Code

Directives scopes and inheritance

Lines of Code : 72License : Strong Copyleft (CC BY-SA 4.0)

<html ng-app="myApp">
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.min.js"></script>   

<body>
   <div ng-controller="myController"> 
       {{message}}
    <div ng-if=true>
        {{message}}
        <div outer   style="background:yellow;padding:20px">
            {{message}}    
        </div>
    </div>  

   </div>
<script>
   angular.module('myApp',[])
   .controller('myController', function ($scope,$rootScope){   
       $scope.message="Football game";
   })
   .directive('outer',  function() {
            return {  

               scope: {}, 
               link:{
                   post:function(scope,element){ 
                       scope.message="Basketball.game";                                           
                    }
               },
               template: "<div>This is directive {{message}}</div>",
               
            }
    });
</script> 

</body>
</html>
<html ng-app="myApp">
 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.min.js"></script>   

<body>
   <div ng-controller="myController"> 
       {{message}}
    <div ng-if=true>
        {{message}}
        <div outer   style="background:yellow;padding:20px">
            {{message}}    
        </div>
    </div>  

   </div>
<script>
   angular.module('myApp',[])
   .controller('myController', function ($scope,$rootScope){   
       $scope.message="Football game";
   })
   .directive('outer',  function() {
            return {  

               scope: true, 
               link:{
                   post:function(scope,element){ 
                       scope.message="Basketball.game";                                           
                    }
               },

            }

    });
</script> 

</body>
</html>

Instructions

Follow the steps carefully to get the output easily.

Install Visual Studio Code on your computer.
Then open the folder from File->Open Folder.
Create a new HTML file(eg: index.html).
Copy the snippet using 'copy' button and paste it into that HTML file.
Save and run the file directly from the file location to get the output.

I hope you found this helpful.

I found this code snippet by searching for 'scope and inheritance in directives' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

The solution is created and tested in Visual Studio Code 1.74.1.

Using this solution, we are able to implement directive scope and inheritance in Angular with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to implement directive scope and inheritance in Angular.

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