使用指令角2更改输入的ngModel值

Question

我一直在研究如何使用指令访问和更改输入ngModel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……它只是设置为我在输入中实际输入的内容，而不是输入的最终值。

I输入'830':

​

​

I选择‘8300FauntleroyWay西南，西雅图，美国，美国’：

​

​

结果值：

{
  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());
        });
      });
    }
  }

})();

但是现在我想把它转换成2角，我有点卡住了。到目前为止，我对转换的看法如下：

/// <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，我不明白如何在角2中实现等效的model.$setViewValue(element.val());。

如能提供任何协助，将不胜感激。

柱塞

Answer 1

我最终让它工作了，尽管我不明白为什么它会工作，因为我没有将ngModelChange绑定到element...but --它可以工作。

指令：

/// <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>

Answer 2

我将注入与您的输入相关联的ControlValueAccessor。以下是一个示例：

@Directive({
  selector: '[test]'
})
export class TestDirective {
  constructor(@Inject(NG_VALUE_ACCESSOR) private valueAccessor:ControlValueAccessor) {
    setTimeout(() => {
      this.valueAccessor[0].writeValue('test');
    }, 1000);
  }
}

参见这个柱塞，例如：https://plnkr.co/edit/owhBHdBncAxlzwJ8xkfq?p=preview。

Answer 3

这就是我用我的数据机所做的，也许会有帮助。

//Create a method in your component to change the model
dateChanged(date) {
   this.hero.bday = date;
}

public ngOnInit() {
    //CREATE A REFERERENCE TO YOUR COMPONENT
    var component:CreateEventComponent = this;
    $("#bday").datepicker({
        dateFormat: "dd-mm-yy",
        altFormat: "dd-mm-yy",
        onSelect: function (dateText, datePicker) {
            //UPDATE YOUR MODEL FORM JQUERY CODE.
            component.dateChanged(dateText);
        }
    });
}