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when do we need to create custom directives in angular?

Amit Pandey

ngFor, ngIf, ngSwitch :- structural or

ngClass, ngStyle :- attribute

What are the things that we can't do with the above mentioned directive? And there will be a real need of custom directive?

2 Replies

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Sachin Singh5y ago
Accepted answer
Yes, you can do almost everything with the above-mentioned built-in directives.
But, when the purpose of the directive is reusability with business logic then you will need to create the custom directives.
some examples are
1. Resize TextArea.
2.AutoFocus
3.Ripple effect on click events.
4.Async email/username validators (mostly used one)
5.Show hide elements based on User Roles.

There might be 100 others, but yes 90% of times built-in ones will be sufficient.
Dinesh D5y ago
We can use attribute directives to change the style of DOM elements. These are the directives also used to hide or show particular DOM elements conditionally. Angular provides many built-in Attribute Directives like NgStyle, NgClass, etc. We can also create our own custom Attribute Directives for our desired functionality

https://angular.io/guide/built-in-directives