Ensure ion-input values are accurate to two decimal places

Question

Ensure ion-input values are accurate to two decimal places

Is there a way to ensure that numbers are always displayed with two decimal places precision in ion-input? For example:

1.01
1.10
1.20
1.23

Instead of displaying as 1.1 and 1.2, they should appear as 1.10 and 1.20.

In my model:

export class HomePage {
   public myValue:number;
}

The corresponding html file looks like this:

<ion-content padding>
  <h3>Hello</h3>
  <ion-row margin-right="50px" margin-left="50px">
      <ion-input type="number" ng-pattern="/^[0-9]+(\.[0-9]{1,2})?$/" step="0.01"
                 [(ngModel)]="myValue" placeholder="0.00"></ion-input>
  </ion-row>
</ion-content>

I have also attempted using the following simpler code:

<ion-input type="number" step="0.01"
                     [(ngModel)]="myValue" placeholder="0.00"></ion-input>

This solution works on web browsers (MacOS, 55.0.2883.95) but fails on Android devices (tested on version 7.1).

Any ideas to resolve this issue?

angular typescript ionic-framework ionic2 ionic3

Answer 1

Answer №1

To preserve the entered number, apply formatting using the decimal pipe when displaying the value. This will consistently show 2 decimal places.

{{ myValue | number:'1.2-2' }}

If you need to utilize the pipe within the component itself, such as for validation purposes, you can inject it.

import { DecimalPipe } from '@angular/common';
class MyService {

    constructor(private decimalPipe: DecimalPipe) {}

    twoDecimals(number) {
        return this.decimalPipe.transform(number, '1.2-2');
    }
}

Note: Make sure to declare it as a provider in your app.module.ts

app.module.ts

import { DecimalPipe } from '@angular/common';

 providers: [
     DecimalPipe
  ]

Answer 2

To preserve the entered number, apply formatting using the decimal pipe when displaying the value. This will consistently show 2 decimal places.

{{ myValue | number:'1.2-2' }}

If you need to utilize the pipe within the component itself, such as for validation purposes, you can inject it.

import { DecimalPipe } from '@angular/common';
class MyService {

    constructor(private decimalPipe: DecimalPipe) {}

    twoDecimals(number) {
        return this.decimalPipe.transform(number, '1.2-2');
    }
}

Note: Make sure to declare it as a provider in your app.module.ts

app.module.ts

import { DecimalPipe } from '@angular/common';

 providers: [
     DecimalPipe
  ]

Answer 3

Answer №2

                  **HTML : **                
 <ion-input type="number" [(ngModel)]="defaultQuantity" formControlName="defaultQuantity" (ngModelChange)="changeQuantity($event)">


    ***Function : ***
    
    import { ChangeDetectorRef } from '@angular/core';

    export class OrderPage {

    constructor(public cdRef : ChangeDetectorRef ){}

          changeQuantity(value){
                    //trigger manual change detection
                    this.cdRef.detectChanges();
                    if(value.indexOf('.') !== -1)
                    {
                      this.defaultQuantity = value.substr(0, value.indexOf('.')+3);
                    } else {
                      this.defaultQuantity = value.length > 4 ? value.substring(0,4) : value;
                    }
                 }

    }


        **OUTPUT :** 

                1.01
                1.10
                1.20
                1.23

Answer 4

                  **HTML : **                
 <ion-input type="number" [(ngModel)]="defaultQuantity" formControlName="defaultQuantity" (ngModelChange)="changeQuantity($event)">


    ***Function : ***
    
    import { ChangeDetectorRef } from '@angular/core';

    export class OrderPage {

    constructor(public cdRef : ChangeDetectorRef ){}

          changeQuantity(value){
                    //trigger manual change detection
                    this.cdRef.detectChanges();
                    if(value.indexOf('.') !== -1)
                    {
                      this.defaultQuantity = value.substr(0, value.indexOf('.')+3);
                    } else {
                      this.defaultQuantity = value.length > 4 ? value.substring(0,4) : value;
                    }
                 }

    }


        **OUTPUT :** 

                1.01
                1.10
                1.20
                1.23

Ensure ion-input values are accurate to two decimal places

Answer №1

Answer №2

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