javascript - 如何在 Angular 7 中设置 ng 自动完成的初始值和验证？

Question

在我的项目中，我想要进行验证并将初始值设置为自动完成。假设:如果用户没有在自动完成框中选择任何内容，我们应该显示验证错误:“请选择国家/地区”。

代码:

<div style="text-align:center">
  <h1>
    Angular autocomplete
  </h1>
  <img width="100" alt="Angular Logo"
       src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg==">
</div>

<div class="ng-autocomplete">
  <ng-autocomplete
    [data]="countries"
    [searchKeyword]="keyword"
    placeHolder="Enter the Country Name"
    (selected)='selectEvent($event)'
    (inputChanged)='onChangeSearch($event)'
    (inputFocused)='onFocused($event)'
    historyIdentifier="countries"
    [itemTemplate]="itemTemplate"
    [notFoundTemplate]="notFoundTemplate">
  </ng-autocomplete>

  <ng-template #itemTemplate let-item>
    <a [innerHTML]="item.name"></a>
  </ng-template>

  <ng-template #notFoundTemplate let-notFound>
    <div [innerHTML]="notFound"></div>
  </ng-template>
</div>

组件.ts:

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  keyword = 'name';
  public countries = [
    {
      id: 1,
      name: 'Albania',
    },
    {
      id: 2,
      name: 'Belgium',
    },
    {
      id: 3,
      name: 'Denmark',
    },
    {
      id: 4,
      name: 'Montenegro',
    },
    {
      id: 5,
      name: 'Turkey',
    },
    {
      id: 6,
      name: 'Ukraine',
    },
    {
      id: 7,
      name: 'Macedonia',
    },
    {
      id: 8,
      name: 'Slovenia',
    },
    {
      id: 9,
      name: 'Georgia',
    },
    {
      id: 10,
      name: 'India',
    },
    {
      id: 11,
      name: 'Russia',
    },
    {
      id: 12,
      name: 'Switzerland',
    }
  ];
    selectEvent(item) {
    // do something with selected item
  }

  onChangeSearch(search: string) {
    // fetch remote data from here
    // And reassign the 'data' which is binded to 'data' property.
  }

  onFocused(e) {
    // do something
  }
}

查看完整项目链接:https://stackblitz.com/edit/angular-ng-autocomplete

Answer 1

我也遇到了类似的问题。我必须在 http 调用的 subscribe() 中设置 ng-autocomplete 的值。 我在 .ts 文件中声明我的自动完成功能: @ViewChild('aziendaAutocomplete') aziendaAutocomplete: 任意; 然后我设置初始值和输入值:

this.aziendaAutocomplete.initialValue = this.aziendeList[0]?.FirmName;
this.aziendaAutocomplete.searchInput.nativeElement.value = this.aziendeList[0]?.FirmName;

就我而言，keyword='FirmName' 并且有效!

           <div class="ng-autocomplete">
            <ng-autocomplete
              #aziendaAutocomplete
              id="aziendaAutocompleteID"
              [data]="aziendeList"
              placeHolder="Cerca un produttore..."
              [searchKeyword]="keyword"
              (selected)='selectEvent($event)'
              (inputChanged)='onChangeSearch($event)'
              (inputCleared)="onClearSearch()"
              [itemTemplate]="itemTemplate"
              [notFoundTemplate]="notFoundTemplate"
              minQueryLength="3"
              [notFoundText]="notFoundText">
            </ng-autocomplete>
            <input type="number" formControlName="azienda" style="visibility: hidden"/>
            <div *ngIf="submitted && formParamsControl.azienda.errors" [ngClass]="(submitted && formParamsControl.azienda.errors) ? 'invalid-feedback d-block' : '' ">
              <div *ngIf="formParamsControl.azienda.errors.required">Selezionare il produttore</div>
            </div>

            <ng-template #itemTemplate let-item>
              <a [innerHTML]="item.FirmName"></a>
            </ng-template>

            <ng-template #notFoundTemplate let-notFound>
              <div [innerHTML]="notFoundText"></div>
            </ng-template>
          </div>