Question

我有一个下拉列表，可以获取一些json数据。我通过获取所有API来获取数据。所以我还没有对任何数据进行硬编码。我正在用角度

<td>
  <mat-form-field>
    <mat-label>Customer</mat-label>
    <mat-select formControlName="custom">
      <mat-option *ngFor="let customer of customerList" [value]="customer.id">
        {{customer.name}}
      </mat-option>
    </mat-select>
  </mat-form-field>
</td>

所以在这里，我有一个名为customerList的列表，其中的数据为json格式。因此，我必须在下拉菜单中显示名称字段，并将ID传递给后端。因此，我的任务是对该下拉列表进行自动填充搜索

Answer 1

您可以使用Angular Material中的AutoComplete。

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

在组件中，您可以编写自己的过滤器逻辑

filteredOptions: Observable<string[]>;

  ngOnInit() {
    this.filteredOptions = this.myControl.valueChanges
      .pipe(
        startWith(''),
        map(value => this._filter(value))
      );
  }

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

    return this.options.filter(option => option.toLowerCase().includes(filterValue));
  }

Answer 2

@Joe Rishwanth您需要添加mat-autocomplete进行下拉

您的客户列表的HTML文件：

<form class="example-form">
<mat-form-field>
    <input type="text"
       placeholder="Enter Customer name"
       aria-label="Number"
       matInput
       [formControl]="custom"
       [matAutocomplete]="auto">
    <mat-autocomplete autoActiveFirstOption #auto="matAutocomplete">
        <mat-option *ngFor="let customer of customerFilter | async" [value]="customer">
            {{customer.name}}
        </mat-option>
    </mat-autocomplete>
</mat-form-field>

Ts文件：

export class AutocompleteAutoActiveFirstOptionExample implements OnInit {
  custom = new FormControl();
  customerList = [{ id: 1, name: "kumar" }, { id: 2, name: "mukesh" }];
  customerFilter: Observable<any>;

  ngOnInit() {
    this.customerFilter = this.custom.valueChanges.pipe(
      startWith(""),
      map(value => this._filter(value))
    );
  }

  private _filter(value: string): any {
    const filterValue = value;
    return this.customerList.filter(customer => {
      return customer.name.toLowerCase().indexOf(filterValue) === 0;
    });
  }
}

关于堆栈闪电的参考文献：https://stackblitz.com/edit/angular-ih4c5r?file=src%2Fapp%2Fautocomplete-auto-active-first-option-example.ts

自动完成搜索下拉角度

2 个答案: