如何格式化数字输入角度

Question

我有这样的数字输入

我想要这样的东西（无论分隔符是什么）

我的实际代码如下：

<div class="row center-xs" *ngFor="let item of listItem;let i=index">
    <div class="col-xs-12 col-md-10">
        <mat-form-field>
            <input [disabled]="item.lock!=0" type="number" matInput [placeholder]="item.name" [(ngModel)]="item.concept" >                                      
        </mat-form-field>
    </div>
</div>

我怎样才能做到这一点？

Answer 1

我有类似的问题。为了解决这个问题，我使用了这篇文章。我创建了一个稍微修改的版本来满足我的需要。

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 = '';
    }
  }
}

Answer 2

我修复了指令代码中的一些错误。

我还解决了从字符串转换为数字的问题。链接到输入的变量被分配了一个字符串值而不是数字，这会在向 API 发送数据时导致错误。

ngModule 将不再被使用，它可以被使用，但它是多余的。

它的使用将保持这种方式。

<input type="text" matInput [(localizedNumericInput)]="invoice.value">

import { formatNumber } from '@angular/common';
import { Directive, ElementRef, EventEmitter, forwardRef, HostListener, Input, Output } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { MAT_INPUT_VALUE_ACCESSOR } from '@angular/material/input';


@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 {
  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);
  }

  @Input('localizedNumericInput') set valor(valor:number) {
    if (!valor) {valor = 0;}

    this.formatValue(valor.toString());
  }
  @Output('localizedNumericInputChange') valorChange = new EventEmitter<number>();


  @Input('objeto') objeto: any;
  @Input('propiedad') propiedad: string;

  @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
    let [integer, decimal] = value.replace(regExp, '').split(this.decimalMarker);

    if (!integer) { integer = 0; }
    if (!decimal) { decimal = 0; }

    //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);

    this.valorChange.emit(parseFloat(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.toString())) {
      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
    let [integer, decimal] = value.toString().split('.');

    if (!integer) { integer = '0'; }
    if (!decimal) { decimal = '00'; }

    //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');
    let [integer, decimal] = value.replace(regExp, '').split(this.decimalMarker);

    if (!integer) { integer = '0'; }
    if (!decimal) { decimal = '00'; }

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