angular7项目中开箱即用的指令

1、去除input首尾的空格

import { Directive, ElementRef, HostListener, Input } from '@angular/core';
import { FormGroup, FormControl, NgControl } from '@angular/forms';

@Directive({
  // tslint:disable-next-line:directive-selector
  selector: '[input-noSpace]'
})

export class InputNoSpaceDirective {
  constructor(private elementRef: ElementRef, private control: NgControl) {
  }
  @HostListener('keydown', ['$event'])
  keydownFun(evt) {
    if (evt.key.trim() === '') {
      evt.preventDefault();
    }
  }

  @HostListener('keyup', ['$event', '$event.target'])
  keyupFun(evt, target) {
    if (target.value) {
      this.control.control.setValue(target.value.replace(/(\s*)/g, ''));
    }
  }
}

2、input限制仅数字输入

import { Directive, ElementRef } from '@angular/core';
import { HostListener } from '@angular/core';
@Directive({
  // tslint:disable-next-line:directive-selector
  selector: '[input-number]'
})

export class NumberinputDirective {
  constructor(element: ElementRef) {}
  @HostListener('input', ['$event'])
  onInput(event) {
    const inputValNumber = /^[0-9]*$/;
    if (inputValNumber.test(event.target.value) === false) {
      event.target.value = '';
    }
  }
}