在输入的每 4 位数字后添加空格 [英] Add space after every 4th digit in input

问题描述

我需要在输入的每 4 个数字后添加一个空格，我在控制台中得到了这个，我如何才能实现这一点以在 Angular 5 中更改输入.

I need to add a space after every 4th digit I enter, I am getting this in the console, how can I can achieve this to change in the input in Angular 5.

我使用的代码如下 .ts

Code I used given below .ts

  mychange(val) {
    const self = this;
    let chIbn = val.split(' ').join('');
    if (chIbn.length > 0) {
      chIbn = chIbn.match(new RegExp('.{1,4}', 'g')).join(' ');
    }
    console.log(chIbn);
    this.id = chIbn;
  }

HTML

<input class="customerno" (ngModelChange)="mychange($event)" [formControl]="inputFormControl" (keydown.backspace)="onKeydown($event)" maxlength="{{digit}}" (keyup)="RestrictNumber($event)" type="tel" matInput [(ngModel)]="id" placeholder="Customer No. ">

控制台:

1
11
111
1111
1111 1
1111 11
1111 111
1111 1111
1111 1111 1
1111 1111 11
1111 1111 111
1111 1111 1111

我改编自 Angular 2 : input 中每 4 位后加连字符，卡号输入.但我把连字符改成了空格.

I adapted it from Angular 2 : add hyphen after every 4 digit in input , card number input. but I changed the hypen to a space.

推荐答案

我建议查看此指令

import { Directive, HostListener, ElementRef } from '@angular/core';

@Directive({
  selector: '[credit-card]'
})
export class CreditCardDirective {

@HostListener('input', ['$event'])
  onKeyDown(event: KeyboardEvent) {
    const input = event.target as HTMLInputElement;

    let trimmed = input.value.replace(/\s+/g, '');
    if (trimmed.length > 16) {
      trimmed = trimmed.substr(0, 16);
    }

    let numbers = [];
    for (let i = 0; i < trimmed.length; i += 4) {
      numbers.push(trimmed.substr(i, 4));
    }

    input.value = numbers.join(' ');

  }
}

并在您的 html 模板中用作

and use in your html template as

<input type="text" credit-card>

这里是源代码

更新:(2019 年 10 月 10 日)输入类型应仅为 text(默认类型)

UPDATE: (10/10/2019) Input type should be only text (default type)

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