“撤消删除”在网络应用程序中？
我看到越来越多的网站在按下删除按钮后提供撤消选项。按钮背后的逻辑是如何完成的？
该项目是否被 javascript 删除并从用户屏幕中“消失”，并添加了计划删除，以便用户有时间撤消它，或者它是如何工作的？
为用户提供撤消功能的其他选项有哪些？
I have seen more and more of the websites that offers a undo option after pressing a delete button. How is the logic done behind the button?
Is the item deleted by javascript and "dissapears" from the users screen and a scheduled delete added, that gives the user time to undo it or how does it work?
What are the other options to offer the users an undo feature?
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这实际上取决于应用程序的结构。
一种常见的方法是不删除记录/项目，而是在内部将其标记为已删除（使用布尔列），将其从所有查询和列表中排除。
如果您有节点结构，您可能希望将项目移至“回收站”节点，从该节点可以将项目恢复到其原始位置。
在这两种变体中，已删除的项目都会不时地被清除 - 根据时间（3 周后删除）或数量（最多保留 50 个已删除的项目，然后开始删除最旧的项目。）
That really depends on the application's structure.
One common way is to not delete a record/an item, but mark it as deleted internally (using a boolean column), excluding it from all queries and lists.
If you have a node structure, you may want to move an item into a "recycle bin" node from where it can be restored to its original location.
In both variations, deleted items would be cleaned out from time to time - either based on time (delete after 3 weeks) or volume (keep max. 50 deleted items, then start deleting the oldest ones.)
我同意 Pekka 的观点，但另外建议您将相关列设为日期时间字段，而不是布尔值（称其为“删除日期”或其他字段）。
这将轻松启用“n 周后删除”功能，并让您真正“撤消”而不是简单地“撤消删除”。
I would agree with Pekka, but additionally suggest that you make the column in question a datetime field, as opposed to boolean (call it "deleted on" or something).
This would easily enable the "delete after n weeks" functionality, as well as let you actually "undo" rather than simply "undelete".
在 HTML5 中将会有一个撤消实现！
但无论如何，正如佩卡所说，您的应用程序必须跟踪“撤消”它所做的事情。一种技术解决方案是保存文档或数据的修订。因此，当用户想要撤消某些操作时，只需加载先前的修订版本。
In HTML5 there will be a Undo implementation!
But nevertheless as Pekka said, your application must track what is done to "undo" it. One technical solution is, to save revisions of a document or of data. So when a user wants to undo something, just the previous revision is loaded.