将参数传递给输入上的Angular 4指令 [英] Pass parameter to Angular 4 directive on input

问题描述

我有一个这样的输入文本字段

I have an input text field like this

<input type="text" class="form-control"  [inputTextFilter]="A" [ngModel]="name">

我的指令是:

import { Directive, Input, HostListener } from '@angular/core';

@Directive({
  selector: '[inputTextFilter]'
})

export class InputTextFilterDirective {
  @Input('inputTextFilter') params: string;

  @HostListener('keypress', ['$event'])
  onKeyUp(event: KeyboardEvent) {
    console.log('got parameters: '+this.params);
  }
}

，并且我创建了一个名为"inputTextFilter"的指令，我要将"A"参数传递给该指令.我传递的参数始终显示为undefined.

and I have created a Directive called "inputTextFilter" to which I want to pass the "A" parameter. My passed parameter always shows as undefined.

推荐答案

尝试一下.

import {Directive, SimpleChanges} from '@angular/core';

@Directive({
  selector: '[inputTextFilter]'
})
export class MyDirective {
  @Input('inputTextFilter') params: string;
  constructor(){}
  ngOnInit(){
     console.log(this.params)
  }
}

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