Tips on leveraging pipes in Angular 8 for bidirectional data binding in inputs

As a newcomer to Angular, I am currently working on an Angular application where I need to format an input field for user income. The desired format includes a GBP symbol before the value and commas separating thousands.

For example, if a user enters their income as 34000, it should be displayed as £34,000.

I have been attempting to achieve this using pipes. I tried both the CurrencyPipe and regular Pipes, but encountered similar issues with both. When using the number pipe, my code snippet looks like this:

<input type="number" (change)="getApp1income()" (keyup)="getApp1income()" [(ngModel)]="app1income | number" [ngModelOptions]="{standalone: true}" min="0" step="500" data-number-to-fixed="2" data-number-stepfactor="500" />

Unfortunately, this results in the following error:

Uncaught Error: Template parse errors:
Parser Error: Cannot have a pipe in an action expression at column 14 in [app1income | number=$event]

The same error occurs when trying to use the CurrencyPipe. It seems that the issue lies in the fact that ngModel is utilizing two-way data binding due to my usage of the entered value elsewhere. Despite researching similar problems, I have yet to find a solution.

Any assistance on this matter would be greatly appreciated.

angulartypescriptangular-pipeangular8

Answer №1

If you are open to using an external library, consider implementing ng2-currency-mask

  1. npm install ng2-currency-mask --save
  2. Include CurrencyMaskModule in the imports Array of the Module where you want to apply this functionality.
  3. To use it: 
    <input currencyMask [(ngModel)]="value" [options]="{ prefix: '£ ', thousands: ',', precision: 0 }"/>

Explore a Live Example on StackBlitz for better understanding.

Answer №2

If you're looking for a convenient way to add masking to your input fields, I suggest checking out ngx-mask: https://www.npmjs.com/package/ngx-mask
It's easy to implement and offers plenty of examples on its documentation page:


For your specific scenario, you can use the following code snippet: 

<input type='text' prefix="£" mask="comma_separator.2" >
Then convert it to a number type in your programming logic

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