angular - 如何配置 NgbDropdown 以显示下拉列表中的所选项目

Question

在ng-bootstrap NgbDropdown ，您将如何显示所选按钮的文本，以便用户选择的任何项目都会替换最初显示的默认文本？

在下面的示例中，目标是显示用户选择的任何排序选项。

<div ngbDropdown class="d-inline-block">

  <button class="btn btn-outline-primary" id="sortMenu" ngbDropdownToggle>Sort by...</button>

  <div class="dropdown-menu" aria-labelledby="sortMenu">
    <button class="dropdown-item">Year</button>
    <button class="dropdown-item">Title</button>
    <button class="dropdown-item">Author</button>
  </div>

</div>

感谢您的帮助!

Answer 1

在 this plunkr 中展示.

示例组件:

import {Component} from '@angular/core';

@Component({
  selector: 'dropdown-demo-sortby',
  template: `
    <div ngbDropdown class="d-inline-block">
      <button class="btn btn-outline-primary" id="sortMenu" ngbDropdownToggle>{{selectedSortOrder}}</button>
      <div class="dropdown-menu" aria-labelledby="sortMenu">
        <button class="dropdown-item" *ngFor="let sortOrder of sortOrders" (click)="ChangeSortOrder(sortOrder)" >{{sortOrder}}</button>
      </div>
    </div>
  `
})
export class DropdownDemoSortby {

  sortOrders: string[] = ["Year", "Title", "Author"];
  selectedSortOrder: string = "Sort by...";

  ChangeSortOrder(newSortOrder: string) { 
    this.selectedSortOrder = newSortOrder;
  }

}