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How to use pipe with ngModel on input elements in angular 

Prashant Surya  |   Mar 21, 2020  |  Views: 1793

Description:

How to use pipe with ngModel on input elements in angular


To use pipe with NgModel of an input , you have to seperate the two way binding of the ngModel.
First will be one way binding and second will be event binding.

[ngModel]="modalName | pipeName" (ngModelChange)="item.value=$event"
<input [ngModel]="item.value | pipeName" 
      (ngModelChange)="item.value=$event" name="inputField" type="text" />
Pipe only works with one way binding, so splitting the two way binding solves the problem.

You can pass arguments like this if required in pipe transformation.

<input [ngModel]="item.value | pipeName:'arg1': arg2" 
      (ngModelChange)="item.value=$event" name="inputField" type="text" />


If you are getting the error:

ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked.



Then you can use function to use pipe class using typescript

<input [ngModel]="item.value" 
  (ngModelChange)="getNewValue($event)" name="inputField" type="text" />

import { UseMyPipeToFormatThatValuePipe } from './path';
constructor({
    private UseMyPipeToFormatThatValue: UseMyPipeToFormatThatValuePipe,
})
getNewValue(ev: any): any {
    item.value= this.useMyPipeToFormatThatValue.transform(ev);
}

Comments:
Content Contributor
Prashant Surya

Prashant Surya

Software developer at Uniserve Data Technologies Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a software developer, freelancer and trainer working on technologies likes. MEAN stack, MERN Stack, ASP.NET full stack, WebRTC, socket.io ,PWA, SQL, JavaScript, jQuery, HTML, CSS, SEO, responsive UI/UX designing... having 7 years of experience in development in multiple domains like, eCommerce, RTA, capital markets, education, real estate...


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