如何使用角度材料 6 自动完成数据服务器 [英] How to use angular material 6 autocomplete with data server

问题描述

我正在使用 Angular 6 和 Material 6 开发一个简单的页面.我想使用 Material 的自动完成功能从服务中恢复数据，但我不知道如何做好.

I'm developing a simple page with Angular 6 and Material 6. I want to recover data from a service using the autocomplete of Material, but I don´t know how to do it well.

来自官方示例https://material.angular.io/components/autocomplete/overview 我不明白如何使用服务将其与自动完成功能集成.

From the official example https://material.angular.io/components/autocomplete/overview I don't understand how to use a service to integrate it with the autocomplete.

有人可以帮我吗?

谢谢

推荐答案

最后，我找到了我想做的事情的解决方案！要将 FormArray 绑定到 mat-table dataSource，您必须:简而言之，示例如下:

Finally, I found a solution to what I wanted to do! To bind a FormArray to mat-table dataSource you have to: Briefly, the example is this:

<table mat-table [dataSource]="itemsDataSource">
  <ng-container matColumnDef="itemName">
    <td mat-cell *matCellDef="let element">{{ element.value.material?.name }}</td>
  </ng-container>
  <ng-container matColumnDef="itemCount">
    <td mat-cell *matCellDef="let element">{{ element.value.itemCount }}</td>
  </ng-container>
  <tr mat-row *matRowDef="let row; columns: itemColumns;"></tr>
</table>

和代码:

export class ItemListComponent implements OnInit {
  constructor(
    private fb: FormBuilder
  ) { }
  itemColumns = ['itemName', 'count'];
  itemForm: FormGroup;
  itemsDataSource = new MatTableDataSource();
  get itemsForm() {
    return this.itemForm.get('items') as FormArray;
  }
  newItem() {
    const a = this.fb.group({
      material: new FormControl(), //{ name:string }
      itemCount: new FormControl() // number 
    });
    this.itemsForm.push(a);
    this.itemsDataSource._updateChangeSubscription(); //neccessary to render the mat-table with the new row
  }
  ngOnInit() {
    this.itemForm = this.fb.group({
      items: this.fb.array([])
    });
    this.newItem();
    this.itemsDataSource.data = this.itemsForm.controls;
  }
}

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