ng g m directive

cd directive

ng g d numberinput

import { NgModule, ModuleWithProviders } from '@angular/core';
import { CommonModule } from '@angular/common';
import { NumberinputDirective } from './numberinput.directive';
@NgModule({
 imports: [
  CommonModule
 ],
 declarations: [NumberinputDirective],
 exports:[ // 使引用該模塊的類可以使用該指令
  NumberinputDirective
 ]
})
export class DirectiveModule { }

@Directive({
 selector: 'input[numberInput]'
})
export class NumberInputDirective {
 // tslint:disable-next-line: no-input-rename
 @Input('numberInput') numberType: string;
 constructor(private el: ElementRef) {}

 @HostListener('input', ['$event.target.value'])
 onChange(value: string): void {
  if (this.numberType.length < 1) {
   this.updateIntegerValue(value);
  } else {
   this.el.nativeElement.value = value.replace(/[^\d.]/g, '');
  }
 }
 @HostListener('blur', ['$event.target.value']) onBlur(value: number): void {
  if (this.numberType.length >= 1) {
   this.updateFloatValue(value);
  }
 }
 updateIntegerValue(value: string): void {
  this.el.nativeElement.value = value.replace(/[^\d]/g, '');
 }
 updateFloatValue(floatValue: number): void {
  const value = String(floatValue);
  const reg = /^-?(0|[1-9][0-9]*)(\.[0-9]*)?$/.test(value);
  const numBegin = /^\d/.test(value);
  const numEnd = /\d$/.test(value);
  if (reg && numBegin && numEnd) {
   this.el.nativeElement.value = value;
  } else {
   this.el.nativeElement.value = 0;
  }
 }
}