在循环中删除？角

如何解决在循环中删除？角

示例：

所有问题都是因为我需要 stopPropagation() 并尝试这个：

打开第一个下拉菜单 然后打开第二个下拉菜单

两个下拉菜单仍然打开... 如果打开第二个下拉菜单，我需要先关闭。

我会尽量解释得更好。

我需要并且必须使用 stopPropagation 而这就是这里的全部问题。

我需要一个关于如何使用 stopPropagation 并防止同时打开多个下拉菜单的解决方案

解决方法

您可以存储上次打开的下拉列表并在下次单击时关闭它：

import { BsDropdownDirective } from 'ngx-bootstrap/dropdown';

@Component({
  // eslint-disable-next-line @angular-eslint/component-selector
  selector: 'demo-dropdown-autoclose',templateUrl: './autoclose.html'
})
export class DemoDropdownAutoCloseComponent {

  private lastOpened: BsDropdownDirective = null;
  
  arr: any = [
    { id: 1,name: 'Test one' },{ id: 2,name: 'Test two' },{ id: 3,name: 'Test three' }
  ];

  clickDropdown(event: Event,dropdown: BsDropdownDirective): void {
    event.stopPropagation();

    if (!!this.lastOpened) {
      this.lastOpened.hide();
    }
    this.lastOpened= dropdown;
  }
}

<div class="row" *ngFor="let singleArr of arr">
  <div class="col-xs-12 col-12 col-sm-6 mb-3">
    <p>Default behavior: dropdown closes after outside click or pressing ESC</p>
    <div class="btn-group" dropdown #dropdown="bs-dropdown">
      <button id="button-autoclose1" dropdownToggle  type="button" class="btn btn-primary dropdown-toggle"
      (click)="clickDropdown($event,dropdown)">
        Button dropdown <span class="caret"></span>
      </button>
      <ul id="dropdown-autoclose1" *dropdownMenu class="dropdown-menu" role="menu" aria-labelledby="button-autoclose1">
        <li role="menuitem"><a class="dropdown-item" href="#">Action</a></li>
        <li role="menuitem"><a class="dropdown-item" href="#">Another action</a></li>
        <li role="menuitem"><a class="dropdown-item" href="#">Something else here</a></li>
      </ul>
    </div>
  </div>

,

// 避免下拉的 JavaScript 代码 // 菜单关闭

    // Clicking dropdown button will toggle display
    function btnToggle() {
        document.getElementById("Dropdown").classList.toggle("show");
    }
      
    // Prevents menu from closing when clicked inside
    document.getElementById("Dropdown").addEventListener('click',function (event) {
        alert("click outside");
        event.stopPropagation();
    });
      
    // Closes the menu in the event of outside click
    window.onclick = function(event) {
        if (!event.target.matches('.dropbutton')) {
          
            var dropdowns = 
            document.getElementsByClassName("dropdownmenu-content");
              
            var i;
            for (i = 0; i < dropdowns.length; i++) {
                var openDropdown = dropdowns[i];
                if (openDropdown.classList.contains('show')) {
                    openDropdown.classList.remove('show');
                }
            }
        }
    }

你能试试这个流程吗