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如何从扩展面板拖放元素，即使拖放元素也应显示在扩展面板中。我需要 Angular 7 中的代码。
请帮我解决我的问题

我尝试从列表中拖放元素，但一旦拖动的元素未显示在列表中。

TS

import {Component} from '@angular/core';
import {CdkDragDrop, moveItemInArray, transferArrayItem} from '@angular/cdk/drag-drop';

/**
 * @title Drag&Drop connected sorting
 */
@Component({
  selector: 'cdk-drag-drop-connected-sorting-example',
  templateUrl: 'cdk-drag-drop-connected-sorting-example.html',
  styleUrls: ['cdk-drag-drop-connected-sorting-example.css'],
})
export class CdkDragDropConnectedSortingExample {
  todo = [
    'Get to work',
    'Pick up groceries',
    'Go home',
    'Fall asleep'
  ];

  done = [
    'Get up',
    'Brush teeth',
    'Take a shower',
    'Check e-mail',
    'Walk dog'
  ];

  drop(event: CdkDragDrop<string[]>) {
    if (event.previousContainer === event.container) {
      moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
    } else {
      transferArrayItem(event.previousContainer.data,
                        event.container.data,
                        event.previousIndex,
                        event.currentIndex);
    }
  }
}

HTML

<div class="example-container">
  <h2>To do</h2>

  <div
    cdkDropList
    #todoList="cdkDropList"
    [cdkDropListData]="todo"
    [cdkDropListConnectedTo]="[doneList]"
    class="example-list"
    (cdkDropListDropped)="drop($event)">
    <div class="example-box" *ngFor="let item of todo" cdkDrag>{{item}}</div>
  </div>
</div>

<div class="example-container">
  <h2>Done</h2>

  <div
    cdkDropList
    #doneList="cdkDropList"
    [cdkDropListData]="done"
    [cdkDropListConnectedTo]="[todoList]"
    class="example-list"
    (cdkDropListDropped)="drop($event)">
    <div class="example-box" *ngFor="let item of done" cdkDrag>{{item}}</div>
  </div>
</div>

CSS

.example-container {
  width: 400px;
  max-width: 100%;
  margin: 0 25px 25px 0;
  display: inline-block;
  vertical-align: top;
}

.example-list {
  border: solid 1px #ccc;
  min-height: 60px;
  background: white;
  border-radius: 4px;
  overflow: hidden;
  display: block;
}

.example-box {
  padding: 20px 10px;
  border-bottom: solid 1px #ccc;
  color: rgba(0, 0, 0, 0.87);
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  cursor: move;
  background: white;
  font-size: 14px;
}

.cdk-drag-preview {
  box-sizing: border-box;
  border-radius: 4px;
  box-shadow: 0 5px 5px -3px rgba(0, 0, 0, 0.2),
              0 8px 10px 1px rgba(0, 0, 0, 0.14),
              0 3px 14px 2px rgba(0, 0, 0, 0.12);
}

.cdk-drag-placeholder {
  opacity: 0;
}

.cdk-drag-animating {
  transition: transform 250ms cubic-bezier(0, 0, 0.2, 1);
}

.example-box:last-child {
  border: none;
}

.example-list.cdk-drop-list-dragging .example-box:not(.cdk-drag-placeholder) {
  transition: transform 250ms cubic-bezier(0, 0, 0.2, 1);
}

实际结果是我可以拖放元素，但一旦删除它们就不会保留在列表中

预期的结果是我需要元素留在后面，即使它被拖放

4

2 回答 2

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您可以查看以下完美解决方案的拖放示例。

https://github.com/choudharymahipal/ToDoList

于 2021-09-21T17:49:12.377 回答
0

嗨，我已将您的整个源代码复制到 stackblitz 中，并设法让一切正常工作。您确定您没有处理缓存或缺少任何参考吗？看看这个并比较你是否错过了任何东西：https ://stackblitz.com/edit/angular-tzg1sk

于 2019-09-20T13:20:55.707 回答