当用户点击时用新元素展开 li

Question

我有一个列表，每行都有删除按钮。当用户单击删除按钮时，li 应该展开并显示一条确认消息和仅用于该 li 的两个按钮。目前，当我单击任何删除按钮时，都会显示所有 li 的确认消息

我已将我的代码粘贴到下面的 stackblitz 中。 https://stackblitz.com/edit/angular-oxnnhv

提前致谢

Answer 1

显示变量在所有项目之间共享。所以所有的 li ui 都被启用了。使用索引进行修复，如下所示

<li fxLayout="column" class="field-list-item filters" *ngFor="let eachColumn of fieldViewList;let i = index"
                    (click)="fieldSelect(eachColumn)">
                    <div fxLayout="row">
                    <div class="title-container">
                        <span class="title">{{eachColumn}}</span>
                    </div>
                    <div class="delete-field hide" (click)="showDeleteConfirmation(i)">Del</div>
                    </div>
                    <div fxLayout="column" *ngIf="show === i" id="{{i}}">
                    <span> Please confirm if you want to delete this field view. This operations can not be undone. </span>
                    <div class="confirmation-button-container">
                        <button (click)="cancelConfirmation($event)">Cancel</button>
                        <button (click)="deleteField($event,eachColumn)">Delete</button>
                    </div>
                    </div>
                </li>

组件应该这样修改

export class AppComponent  {
  name = 'Angular';
  fieldViewList = ['field1','field2','field3','field4','field5'];
   public show: number;

   deleteField(e, column) {
    e.stopPropagation();
    console.log('deleteField() : ', e);
    console.log('column : ', column);

  }

  showDeleteConfirmation(index: number) {
    console.log('showDeleteConfirmation');
    this.show = index;
  }

  cancelConfirmation(index: number) {
    console.log('cancelConfirmation');
    this.show = index;
  }

  fieldSelect(column) {
    console.log('FieldSelect() : ', column);
  }
}

Answer 2

见updated stackblitz。像这样为每个 item 使用一个 show 变量：

fieldViewList = [
  {
      title: 'field1',
      show: false
  },
  {
      title: 'field2',
      show: false
  },
  {
      title: 'field3',
      show: false
  },
  {
      title: 'field4',
      show: false
  },
  {
      title: 'field5',
      show: false
  }
];

这允许您单独切换每个项目。

不要忘记像这样修改视图：*ngIf="eachColumn.show" 和 {{eachColumn.title}} 并使用组件中的 column.show = true; 访问列。

Answer 3

修改下面的代码应该可以了。现在，您可以指定要显示的项目，而不是设置显示。

  showDeleteConfirmation(e, eachColumn) {
    e.stopPropagation();
    console.log('showDeleteConfirmation');
    this.show = eachColumn;
  }
 <div fxLayout="column" *ngIf="show === eachColumn">

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