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Revati S Misra

Revati S Misra

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Aryan Kumar

Aryan Kumar

05-Oct-2023

Creating custom directives in AngularJS is a fundamental part of extending HTML with your own custom functionality. AngularJS allows you to define your own HTML tags or attributes, and when the browser encounters them, it invokes custom JavaScript code that you provide. Here's how you can create custom directives in AngularJS:

1. Create an AngularJS Module:

Start by creating an AngularJS module that will contain your custom directive(s). This is done using the angular.module function.

angular.module('myApp', []);

2. Define the Directive:

To define a custom directive, use the directive method of your AngularJS module. The directive method takes two arguments: the name of the directive and a factory function that returns a configuration object.

angular.module('myApp').directive('myDirective', function () {
  return {
    // Configuration options go here
  };
});

3. Configure the Directive:

Inside the configuration object, you specify various options for your directive:

restrict: Defines how the directive can be used. Common values are 'E' (element), 'A' (attribute), and 'C' (class). You can also use a combination, like 'EA'.

template or templateUrl: Defines the HTML template for your directive. You can provide the template directly as a string or load it from an external file using templateUrl.

scope: Defines the scope of the directive. By default, directives use the parent scope, but you can create an isolated scope to encapsulate the directive's behavior.

controller: Specifies a controller for the directive, which can contain business logic and functions.

link: Defines a function that is executed when the directive is linked to the DOM. This is where you can interact with the DOM and add event handlers.

4. Use the Directive in HTML:

Once your custom directive is defined, you can use it in your HTML code. Use the name of the directive as an element, attribute, class, or comment, depending on the restrict option you defined.

<my-directive></my-directive>
<!-- or -->
<div my-directive></div>
<!-- or -->
<div class="my-directive"></div>

5. Configure the Module:

Don't forget to include your custom directive module in your main AngularJS application module.

angular.module('app', ['myApp']);

Example:

Here's an example of a simple custom directive that displays a message:

angular.module('myApp').directive('myDirective', function () {
  return {
    restrict: 'E',
    template: '<div>This is my custom directive!</div>',
  };
});

In your HTML, you can use this directive like this:

<my-directive></my-directive>

When AngularJS encounters <my-directive></my-directive>, it replaces it with the template defined in your custom directive configuration.

This is a basic introduction to creating custom directives in AngularJS. You can make directives more complex by adding controllers, transclusion, and more, depending on your requirements.

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