javascript - ng-选择 : add an extra option

Question

如何向我的 ng-select 下拉列表中添加额外的项目，如 Create New in the following image :



这是我拥有的当前代码:

<ng-select
    [multiple]="true"
    [hideSelected]="true"
    [items]="robots"
    formControlName="RobotGUID"
    bindLabel="Name"
    bindValue="GUID"
>
    <ng-template ng-label-tmp let-item="item" let-clear="clear">
        <ng-container *ngIf="item.GUID">
            <span class="ng-value-icon left" (click)="onRobotEditClick($event, item.GUID)" aria-hidden="true">
                <i class="fas fa-edit btn-focus"></i>
            </span>
            <span class="ng-value-label">{{item.Name}}</span>
            <span class="ng-value-icon right" (click)="clear(item)" aria-hidden="true">×</span>
        </ng-container>
    </ng-template>
</ng-select>

我尝试使用 <ng-option>但该项目没有出现在下拉列表中。
如何从模板中添加额外的项目？

Answer 1

您可以使用[addTag]和 addTagText .

[addTag] :允许创建自定义选项。

addTagText :使用标记时设置自定义文本。

app.component.html :

<ng-select [items]="cities" 
      bindLabel="name" 
      placeholder="Select city"      
      [(ngModel)]="selectedCity" 
      addTagText="Create New" 
      [addTag]="CreateNew">
</ng-select>

app.component.ts :

export class AppComponent {

    cities = [
        {id: 1, name: 'City1'},
        {id: 2, name: 'City2'},
        {id: 3, name: 'City3'},
        {id: 4, name: 'City4'},
        {id: 5, name: 'City5'}
    ];
    
   CreateNew(city){
     alert("Create New Clicked : "+city)
   }
}

图片:
1.

2.