你必须创建自定义组件来做到这一点。
或者只使用这样的角材料:
HTML
<mat-form-field>
<mat-select placeholder="Toppings" [formControl]="toppings" multiple>
<mat-option *ngFor="let topping of toppingList" [value]="topping">{{topping}}</mat-option>
</mat-select>
</mat-form-field>
TS
import {Component} from '@angular/core';
import {FormControl} from '@angular/forms';
/** @title Select with multiple selection */
@Component({
selector: 'select-multiple-example',
templateUrl: 'select-multiple-example.html',
styleUrls: ['select-multiple-example.css'],
})
export class SelectMultipleExample {
toppings = new FormControl();
toppingList: string[] = ['Extra cheese', 'Mushroom', 'Onion', 'Pepperoni', 'Sausage', 'Tomato'];
}
示例:https ://stackblitz.com/angular/egkdgobgevx?file=app%2Fselect-multiple-example.ts