当我首先过滤然后对表格进行分组时，垫表中的行消失

问题描述

当我不过滤时，mat-table 中的分组工作正常.
当过滤或将焦点放在搜索栏上时，表格会被过滤，但是如果我取消组合它，垫表的行就会消失.
请帮助我提供一个解决方案，即使在我对其进行过滤后，该解决方案也可以对表格进行分组或取消分组.
当我首先将焦点放在过滤器搜索栏上时，即使在分组时也会出现此问题.
当我为搜索栏设置过滤器时，我认为问题在于过滤器谓词.

Grouping in mat-table works fine when I don't filter it.
When filtered or put focus on search bar, the table gets filtered but then if I ungroup it, the rows of mat table disappear.
Please help me with a solution which groups or ungroups the table even after I filter it.
This problem occurs even while grouping when I put focus on filter search bar first.
I think the problem is with filter predicate when I setup filter for search bar.

这是工作堆栈闪电战链接:
https://stackblitz.com/edit/xwcnz?file=src%2Fapp%2Fapp.component.ts

Here is the working stack blitz link:
https://stackblitz.com/edit/xwcnz?file=src%2Fapp%2Fapp.component.ts

推荐答案

StackBlitz.

我已经删除了你的过滤器分配，然后它就可以工作了.

I've removed your filter assignment and then it's working.

this.dataSource.filter = performance.now().toString();

我很困惑.什么是性能?

无论如何，我认为您的过滤和分组现在都运行良好.

Anyways, I think your filtering and grouping both are working perfectly now.

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