使用指令Angular 2更改输入的ngModel值

Question

我坚持如何ngModel使用指令访问和更改输入值.问题的结果是,当我选择所需的地址时,模型的地址值不会更新...它只是设置为我实际键入输入的内容,而不是输入的最终值.

我键入'830':

我选择'8300 Fauntleroy Way Southwest,Seattle,WA,United States':

结果价值:

{
  address: '830'
}

期望值:

{
  address: '8300 Fauntleroy Way Southwest, Seattle, WA, United States'
}

在AngularJS中,我可以这样做:

(function() {
  'use strict';

  angular
  .module('casemanagerApp')
  .directive('googleplace', googleplace);

  function googleplace() {

    var directive = {
      require: 'ngModel',
      link: link
    };

    return directive;

    function link(scope, element, attrs, model) {
      var options = {
        types: [],
        componentRestrictions: {}
      };
      scope.gPlace = new google.maps.places.Autocomplete(element[0], options); // jshint ignore:line

      google.maps.event.addListener(scope.gPlace, 'place_changed', function() { // jshint ignore:line
        scope.$apply(function() {
          model.$setViewValue(element.val());
        });
      });
    }
  }

})();

但是现在我正在尝试将它转换为Angular 2,我有点卡住了.这是我到目前为止转换的内容:

/// <reference path="../../../../typings/browser/ambient/googlemaps/index.d.ts"/>

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

@Directive({
  selector: '[google-places]'
})
export class GooglePlaces implements OnInit {

  constructor(private _el: ElementRef) { }

  ngOnInit() {
    let gPlace = new google.maps.places.Autocomplete(this._el.nativeElement);
    google.maps.event.addListener(gPlace, 'place_changed', () => console.log(this._el.nativeElement));
  }

}

用法:

<input type="text"
       ngControl="address"
       placeholder="Enter a location"
       [(ngModel)]="subject.address"
       #address="ngForm"
       google-places
       required>

问题的核心是我不明白如何model.$setViewValue(element.val());在Angular 2中做相同的事情.

任何帮助将不胜感激.

Plunker

Answer 1

我最终使它起作用，尽管我不明白为什么它起作用，因为我没有绑定ngModelChange到元素...但是它起作用了。

指示：

/// <reference path="../../../../typings/browser/ambient/googlemaps/index.d.ts"/>

import { Directive, ElementRef, Output, EventEmitter, OnInit, NgZone } from '@angular/core';

@Directive({
  selector: '[google-places]'
})
export class GooglePlaces implements OnInit {
  @Output() ngModelChange: EventEmitter<any> = new EventEmitter(false);

  options = {
    types: ['address'],
    componentRestrictions: { country: "us" }
  };

  constructor(
    private _el: ElementRef,
    private _ngZone: NgZone) { }

  ngOnInit() {
    let gPlace = new google.maps.places.Autocomplete(this._el.nativeElement, this.options);
    google.maps.event.addListener(gPlace, 'place_changed', () => {
      this._ngZone.run(() =>
        this.ngModelChange.emit(this._el.nativeElement.value));
    });
  }

}

组件模板：

<input type="text"
            class="form-control"
            ngControl="address"
            id="subjectAddress"
            placeholder="Enter a location"
            [(ngModel)]="subject.address"
            #address="ngForm"
            google-places
            required>