Using ngModel instead of value to bind a custom Angular directive for currency input

Currently, I am using a specialized mat-input-currency format directive to automatically convert my field inputs into currency. You can find the npm repository here.

However, the directive binds the element data to [value] of the input, and I require it to be 2-way bound to [(ngModel)]. The binding functions correctly, but the currency format display is not visible when first loaded; it only appears after clicking on the input and then clicking out. When bound to [value], however, it displays in currency format upon loading.

Here is the StackBlitz that I created from the Demo. I attempted to write a function to possibly tap into an onload event for the input, but I am unsure how to proceed. Is there a way to have it load with the ngModel formatted? The event does not appear to trigger on onload.

  <mat-form-field *ngIf="mpPatient.ssissdiawardLetter=='Y'" appearance="standard">
          <mat-label>SSI/SSDI Award Amount</mat-label>
          <input matInput type="text"
         (onload)="onLoadCurrencyEvent($event, mpPatient.ssissdiawardAmount)"
          mvndrMatCurrencyFormat [allowNegative]="false" [currencyCode]="'USD'"
          [(ngModel)]="mpPatient.ssissdiawardAmount"
          (blur)="updateUSAmount($event, mpPatient.ssissdiawardAmount)">
        </mat-form-field>
javascriptangulartypescriptangular-materialangular-ngmodel

Answer №1

It seems like the custom directive you used is not available on Github, so I am unable to inspect its source code to understand what might be causing issues. Based on your code snippet, I suggest utilizing Angular's CurrencyPipe for formatting purposes.

<mat-form-field class="example-full-width">
            <input matInput type="text"
      [value]="testvalue | currency:'USD'" />
</mat-form-field>

I have forked your demo for reference: https://stackblitz.com/edit/angular-3gatlt?file=src/app/app.component.html

Answer №2

Shortly after posting my query, I stumbled upon the solution. It was as simple as deconstructing the ngModel into property binding and event binding. So instead of using 

 [(ngModel)]="mpPatient.ssissdiawardAmount"
, I now use

[value]="mpPatient.ssissdiawardAmount"
(input)="mpPatient.ssissdiawardAmount = $event.target.value"

Alternatively, Kevin Zhang's suggestion also does the trick.

Hoping this can assist someone else in the future.

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