将一千个分隔符添加到angular4中的输入字段

时间:2018-05-03 05:49:56

标签: angular

我使用角度4作为我的前端。我想在输入字段中插入一个千位分隔符。我试过这段代码,但它不能正常工作



   <input type="number" class="form-control" id="amount" placeholder="Amount" name="Amount" [ngModel]="Amount | number:'3.2-2'" (keypress)="onlyNumberKey($event)">
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这是我的component.ts代码

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export class CustomerDepositApplicationComponent implements OnInit {

Amount: any;
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请帮帮我..

3 个答案:

答案 0 :(得分:2)

你无法添加这样的管道。您需要做的是,在 ts 中正确格式化您的号码并绑定它。

对于这种情况,

numeraljs是一个非常好的库。

让我用它创建一个stackblitz。

<强>更新

我创建了简单的stackblitz。请看一看。由于stackblitz需要问题,我无法将数字包导入stackblitz。但如果使用数字,这会更容易。

在此示例中,我使用了.toLocaleString();功能,其中JS自动检测浏览器区域并适当地转换您的号码。例如,如果您的浏览器区域设置为 en-US ,则数字格式将为15,000。如果它是nb-NO号可能看起来不同。

答案 1 :(得分:0)

您可以添加ngx-currency模块并按以下方式使用它:

<input id="valueInput" class="input amount" placeholder="Amount" [(ngModel)]="amount" value="0" currencyMask min="0" (ngModelChange)="amountChanged($event)" >

答案 2 :(得分:0)

我有类似的问题。为了解决这个问题,我使用了这个article。我创建了一个略微修改的版本以满足我的需求。

import { Directive, ElementRef, forwardRef, HostListener, Input, OnDestroy } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { MAT_INPUT_VALUE_ACCESSOR } from '@angular/material';
import { Subscription } from 'rxjs';
import { formatNumber } from '@angular/common';

@Directive({
  selector: 'input[localizedNumericInput]',
  providers: [
    { provide: MAT_INPUT_VALUE_ACCESSOR, useExisting: LocalizedNumericInputDirective },
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => LocalizedNumericInputDirective),
      multi: true
    }
  ]
})
export class LocalizedNumericInputDirective implements ControlValueAccessor, OnDestroy {
  locale = 'en';
  decimalMarker: string;

  constructor(private element: ElementRef<HTMLInputElement>) {
  }

  private _value: string | null;

  get value(): string | null {
    return this._value;
  }

  @Input('value')
  set value(value: string | null) {
    this._value = value;
    this.formatValue(value);
  }

  @HostListener('input', ['$event.target.value'])
  input(value) {
    //Find all numerics, decimal marker(, or .) and -
    //It will delete thousandSeparator cos it's always opposite to decimal marker
    const regExp = new RegExp(`[^\\d${this.decimalMarker}-]`, 'g');
    //Separate value on before and after decimal marker
    const [integer, decimal] = value.replace(regExp, '').split(this.decimalMarker);

    //Send non localized value, with dot as decimalMarker to API
    this._value = decimal ? integer.concat('.', decimal) : integer;

    // If decimal separator is last character don't update
    // because it will delete . || ,
    if (this.isLastCharacterDecimalSeparator(value)) {
      this._value = value;
    }

    // here to notify Angular Validators
    this._onChange(this._value);
  }

  @HostListener('blur')
  _onBlur() {
    /**
     * Adding thousand separators
     */
    this.formatValue(this._value);
  }

  @HostListener('focus')
  onFocus() {
    this.unFormatValue();
  }

  _onChange(value: any): void {}

  /**
   * @param value
   * apply formatting on value assignment
   */
  writeValue(value: any) {
    this._value = value;
    this.formatValue(this._value);
  }

  registerOnChange(fn: (value: any) => void) {
    this._onChange = fn;
  }

  registerOnTouched() {}

  isLastCharacterDecimalSeparator(value: any) {
    return isNaN(value[value.length - 1]);
  }


  private formatValue(value: string | null) {
    if (value === null) {
      this.element.nativeElement.value = '';
      return;
    }

    if (this.isLastCharacterDecimalSeparator(value)) {
      this.element.nativeElement.value = value;
      return;
    }

    // Conclude the decimal and thousand separators from locale
    const [thousandSeparator, decimalMarker] = formatNumber(1000.99, this.locale).replace(/\d/g, '');
    this.decimalMarker = decimalMarker;

    //Here value should always come with . as decimal marker thus any other behavior is bug
    const [integer, decimal] = value.split('.');

    //Group every three elements, and add thousandSeparator after them
    this.element.nativeElement.value = integer.replace(/\B(?=(\d{3})+(?!\d))/g, thousandSeparator);

    //Add decimals and decimalMarker if any
    if (decimal) {
      this.element.nativeElement.value = this.element.nativeElement.value.concat(decimalMarker, decimal);
    }
  }

  private unFormatValue() {
    const value = this.element.nativeElement.value;
    if (this.isLastCharacterDecimalSeparator(value)) {
      return;
    }
    const regExp = new RegExp(`[^\\d${this.decimalMarker}-]`, 'g');
    const [integer, decimal] = value.replace(regExp, '').split(this.decimalMarker);

    this._value = integer.concat('.', decimal);
    if (value) {
      this.element.nativeElement.value = this._value;
    } else {
      this.element.nativeElement.value = '';
    }
  }
}

要使用此指令,您的html应该如下所示:

<mat-form-field>
<mat-label>Value</mat-label>
<input
        type="text"
        localizedNumericInput
        matInput
        autocomplete="off"
        formControlName="value"
      />
</mat-form-field>