javascript - 以 Angular 2 格式化货币输入

Question

我想在您键入时将输入格式化为美元货币。输入将有 2 个小数位，并且将从右到左输入。假设如果我输入 54.60，它将输入为 $0.05-->$0.54-->$5.46-->$54.60。这PLUNKER正是这样做的，但它是在 Angular js 中。到目前为止，我的指令看起来像:

import {Directive, Output, EventEmitter} from '@angular/core';
import {NgControl} from '@angular/forms';

@Directive({
  selector: '[formControlName][currency]',
  host: {
    '(ngModelChange)': 'onInputChange($event)',
    '(keydown.backspace)':'onInputChange($event.target.value, true)'
  }
})
export class CurrencyMask {
  constructor(public model: NgControl) {}

  @Output() rawChange:EventEmitter<string> = new EventEmitter<string>();

  onInputChange(event: any, backspace: any) {
    // remove all mask characters (keep only numeric)
    var newVal = event.replace(/\D/g, '');
    var rawValue = newVal;
    var str = (newVal=='0'?'0.0':newVal).split('.');
    str[1] = str[1] || '0';
    newVal= str[0].replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1,') + '.' + (str[1].length==1?str[1]+'0':str[1]);



    // set the new value
    this.model.valueAccessor.writeValue(newVal);
    this.rawChange.emit(rawValue)
  }
}

在 html 中它被用作:

<input  name="cost" placeholder="cost" class="form-control"  type="text" currency formControlName="cost" (rawChange)="rawCurrency=$event">

更新:

最终对我有用的是:

onInputChange(event: any, backspace: any) {
    var newVal = (parseInt(event.replace(/[^0-9]/g, ''))/100).toLocaleString('en-US', { minimumFractionDigits: 2 });
    var rawValue = newVal;

    if(backspace) {
      newVal = newVal.substring(0, newVal.length - 1);
    }

    if(newVal.length == 0) {
      newVal = '';
    }
    else  {
      newVal = newVal;
    }
    // set the new value
    this.model.valueAccessor.writeValue(newVal);
    this.rawChange.emit(rawValue)
  }

Answer 1

在输入更改时使用以下内容

// remove dot and comma's, 123,456.78 -> 12345678
var strVal = myVal.replace(/\.,/g,'');
// change string to integer
var intVal = parseInt(strVal); 
// divide by 100 to get 0.05 when pressing 5 
var decVal = intVal / 100;
// format value to en-US locale
var newVal = decVal.toLocaleString('en-US', { minimumFractionDigits: 2 });

// or in singel line
var newVal = (parseInt(myVal.replace(/\.,/g, '')) / 100).toLocaleString('en-US', { minimumFractionDigits: 2 });

或

仅使用货币管道格式化为美元格式

var newVal = (parseInt(myVal.replace(/\.,/g, '')) / 100)

希望这对您有所帮助。