Directives scopes and inheritance

by Abdul Rawoof A R Updated: Jan 22, 2024

Guide Kit

Accessing any data in the parent scope requires passing the data at two places. These places are the directive scope and the directive tag. The directive scope makes use of prefixes to acquire that.

Using prefixes enables set up a two-manner or one-manner binding among discern and directive scopes. It also makes calls to parent scope methods. Why are directives used in Angular? Extended HTML attributes with the prefix ng- are the Angular directives. The ng-app directive initializes an AngularJS application. The ng-init directive initializes application data. The ng-version directive binds the price of HTML controls to software data. It works with input, select, and text area. You can create a component directive many times. Every component in Angular will have a @Component decorator attached. We cannot practice multiple structural directives to the identical HTML element.

Directives are classes that add extra behavior to elements in your Angular applications. Use Angular's integrated directives to manipulate forms, lists, styles, and what customers 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.

FAQ

1. What are Angular directives?

Angular directives are like special instructions for HTML elements. They help add behavior, manage forms, lists, and styles in Angular applications. They also control how things look.

2. What does the ng-app directive do?

The ng-app directive kicks off an AngularJS application. It's like saying, "Hey Angular, start jogging here!

3. How does ng-model help in Angular?

The ng-model directive creates a link between what users type in HTML controls. It links them to the data in your Angular app. It's a way of keeping things connected.

4. Can we have many instances of a component directive in Angular?

You can use a component directive many times. Each one usually comes with a @Component decorator in Angular.

5. What's the purpose of using prefixes in Angular directives?

Prefixes, like ng-, are like labels for Angular directives. They help establish connections between the parent and directive scopes. This allows data to flow and makes calls to methods in the parent scope.

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