Angular Attribute Directive表单输入

Question

I'm struggling to get @Directive to work as intended.

I would like the Attr Directive to be able to access the model.password in the directive constructor and set variable varpassword with the current password.

I would also like to be able to retrieve all other inputs within the form field, how would i go about this?

The documentation for a lot of this is not complete since being in Beta i know.

I've been trying to figure this out for days with limited success. I've removed the imports that i have tried to get it working on because i think I'm confused how to use them properly within the directive i have tried "NgModel, NgControl, ControlGroup, NgFormModel, FormBuilder...".

My test example code below.

login-form.html

<form #testForm="ngForm">
    Email Address: 
    <input type="text" name="username" size="50" required="required" [(ngModel)]="model.username" ngControl="username" #username="ngForm" />

    Password: 
    <input type="password" name="password" size="20" required="required" [(ngModel)]="model.password" ngControl="password" #password="ngForm" testdir />

    <input type="submit" value="Login" />
</form>

app.ts

import {Component} from 'angular2/core';

import {TestDirective} from '../../directives/test.directive';

@Component({
    selector: 'test-app',
    templateUrl: 'login-form.html',
    directives: [TestDirective]
})
export class TestApp {}

test.directive.ts

import {Directive} from 'angular2/core';

@Directive({
    selector: '[testdir]',
    host: {
        '(keydown)': 'run()'
    }
})
export class TestDirective {

    varpassword: string;

    constructor() {
        this.varpassword = [******]
    }

    run() {
        console.log( this.varpassword );
    }

}

If anyone can point me in the right direction would be much appreciated.

Answer 1

You need to inject NgControl into your directive:

@Directive({
  (...)
})
export class TestDirective {
  varpassword: string;

  constructor(private ctrl:NgControl) {
  }

  ngOnInit() {
    this.varpassword = this.ctrl.value;
  }
}

Se this plunkr: https://plnkr.co/edit/3y4Qf7M4hb3zDIEJ773Q?p=preview .

Answer 2

Example of input directive with commas when focus out.

import {Directive, ElementRef} from '@angular/core';
    @Directive({
      selector: '[numberInput]',
      host: {
        '(focus)': '_onFocus()',
        '(blur)': '_onBlur()',
        '(keydown)': '_onKeypress($event)'
      }
    })
    export class InputNumberDirective {
      inputElement: ElementRef;

      constructor(el: ElementRef) {
        this.inputElement = el;
      }

      _onBlur() {
         this.inputElement.nativeElement.value = this.inputElement.nativeElement.value.length > 0 ? parseInt(this.inputElement.nativeElement.value).toString().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,") : '';
      }

      _onKeypress(event: KeyboardEvent) {
          if((event.which>= 58 && event.which<=126) || (event.keyCode >= 33  && event.which<= 47)){
            event.preventDefault();
       }
          return event;
      }
    }