是否可以同时使用 mat-select 和 mat-chips? [英] Is it possible to use mat-select and mat-chips together?

问题描述

我想知道是否可以混合"mat-select 和 mat-chip-list.在 chip-list 中，我想显示从 mat-select 中选择的选项.

如果是，我该怎么做?

解决方案

是的，这是可能的.您需要在 中使用 .在 中放置 .

在您的 HTML 模板中，您需要如下内容:

<mat-label>Toppings</mat-label><mat-select [formControl]="toppingsControl" 多个><mat-select-trigger><mat-chip-list><mat-chip *ngFor="let topping of toppingsControl.value"[removable]="true" (removed)="onToppingRemoved(topping)">{{ 配料 }}<mat-icon matChipRemove>取消</mat-icon></mat-chip></mat-chip-list></mat-select-trigger><mat-option *ngFor="let topping of toppingList" [value]="topping">{{topping}}</mat-option></mat-select></mat-form-field><br/><!-- 仅用于调试-->{{ 配料控制.value |json }}

在你的 ts 中:

@Component({选择器:'选择多个示例'，templateUrl: 'select-multiple-example.html',styleUrls: ['select-multiple-example.css'],})导出类 SelectMultipleExample {顶部控件 = 新表单控件([]);顶部列表:字符串[] = ['额外的奶酪'，'蘑菇'，'洋葱'，'意大利辣香肠'，'香肠'，'番茄'];onToppingRemoved(顶部:字符串){const toppings = this.toppingsControl.value as string[];this.removeFirst(浇头，浇头)；this.toppingsControl.setValue(浇头)；//触发变化检测}private removeFirst(array: T[], toRemove: T): void {const index = array.indexOf(toRemove);如果(索引！== -1){array.splice(index, 1);}}}

I wanna know if it's possible have a "mix" of mat-select and mat-chip-list. In the chip-list, I want to show the selected options from mat-select.

If it is, how can I do it?

解决方案

Yes, it is possible. You need to use <mat-select-trigger> within <mat-select>. Inside <mat-select-trigger> place <mat-chip-list>.

In your HTML template you need something like:

<mat-form-field>
  <mat-label>Toppings</mat-label>
  <mat-select [formControl]="toppingsControl" multiple>

    <mat-select-trigger>
      <mat-chip-list>
        <mat-chip *ngFor="let topping of toppingsControl.value"
          [removable]="true" (removed)="onToppingRemoved(topping)">
          {{ topping }}
          <mat-icon matChipRemove>cancel</mat-icon>
        </mat-chip>
      </mat-chip-list>
    </mat-select-trigger>

    <mat-option *ngFor="let topping of toppingList" [value]="topping">{{topping}}</mat-option>

  </mat-select>
</mat-form-field>

<br/> <!-- only for debug -->
{{ toppingsControl.value | json }}

And in your ts:

@Component({
  selector: 'select-multiple-example',
  templateUrl: 'select-multiple-example.html',
  styleUrls: ['select-multiple-example.css'],
})
export class SelectMultipleExample {
  toppingsControl = new FormControl([]);
  toppingList: string[] = ['Extra cheese', 'Mushroom', 'Onion', 'Pepperoni', 'Sausage', 'Tomato'];

  onToppingRemoved(topping: string) {
    const toppings = this.toppingsControl.value as string[];
    this.removeFirst(toppings, topping);
    this.toppingsControl.setValue(toppings); // To trigger change detection
  }

  private removeFirst<T>(array: T[], toRemove: T): void {
    const index = array.indexOf(toRemove);
    if (index !== -1) {
      array.splice(index, 1);
    }
  }

}

Here is a complete example with Angular Material 9, but it works the same in version 6.

I hope this helps!

这篇关于是否可以同时使用 mat-select 和 mat-chips?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！