Angular 6:如何在mat-autocomplete下拉列表中访问所有选项值?

时间:2018-09-17 06:43:02

标签: javascript angular angular-material angular6

给定Angular文档you can see here中的示例并在下面重复,如何访问options中的其余对象数据?

例如,如果该对象不仅仅是一个简单的key:value格式的名称列表,而是更复杂的东西,例如来自API的数据:

dataObject = {
  name: 'someName',
  nameID: 'someId',
  foo: 'bar'
  }

文档中的示例太简单了,没有告诉我如何获取name才能在输入字段中显示,以及如何在ts文件中获取相应的nameId通过API返回PUT请求。

<form class="example-form">
  <mat-form-field class="example-full-width">
    <input type="text" placeholder="Assignee" aria-label="Assignee" matInput [formControl]="myControl" [matAutocomplete]="auto">
    <mat-autocomplete #auto="matAutocomplete" [displayWith]="displayFn">
      <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
        {{option.name}}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
</form> 

component.ts:

export class AutocompleteDisplayExample implements OnInit {
  myControl = new FormControl();
  options: User[] = [
    {name: 'Mary'},
    {name: 'Shelley'},
    {name: 'Igor'}
  ];
  filteredOptions: Observable<User[]>;

  ngOnInit() {
    this.filteredOptions = this.myControl.valueChanges
      .pipe(
        startWith<string | User>(''),
        map(value => typeof value === 'string' ? value : value.name),
        map(name => name ? this._filter(name) : this.options.slice())
      );
  }

  displayFn(user?: User): string | undefined {
    return user ? user.name : undefined;
  }

  private _filter(name: string): User[] {
    const filterValue = name.toLowerCase();

    return this.options.filter(option => option.name.toLowerCase().indexOf(filterValue) === 0);
  }
}

1 个答案:

答案 0 :(得分:1)

我认为您正在寻找onSelectionChange选项:

您可以简单地添加到mat-option中:

(onSelectionChange)="setID(option.nameID)"

每次选择一个值时,都会触发该事件。