firebase - >日期顺序反转 [英] firebase -> date order reverse
问题描述
我目前正在使用Firebase制作应用。
这是其中一个可以在网络上看到的公告板。
但是有一个问题。
这是日期排序问题。
<我想先看看最近的日期,但我总是只看到我先创建的数据。
postRef.orderByChild('createData')。startAt(reverseDate).limitToFirst(1).on('child_added',( data)=> {
console.log(data.val()。name + data.val()。createData);
})
结果 - > hello1496941142093
我的火力基地树
我的代码与上述代码相同。
如何查看我最近的帖子?
如何订购firebase数据库的反转?
Firebase数据库将始终按升序返回结果。没有办法扭转它们。
这有两种常见的解决方法:
- 让数据库进行过滤,然后反转客户端的结果。
- 向数据库添加反转值,并使用它进行查询。
这些选项之前已被覆盖过很多次。因此,我不会重复,而是列出以前的答案:
- 以降序发布的顺序显示帖子
- 使用负时间戳按降序对firebase数据进行排序
- firebase sort reverse order
- 是否可以撤销Firebase列表?
- 此列表中的更多内容: https:// www.google.com/search?q=site:stackoverflow.com+firebase+reverse%20sort%20javascript
I am currently making an app using Firebase.
It is one of those bulletin boards that can be seen anywhere on the web.
But there was one problem.
This is a matter of date sorting.
I want to look at the recent date first, but I always see only the data I created first.
postRef.orderByChild('createData').startAt(reverseDate).limitToFirst(1).on('child_added',(data)=>{
console.log(data.val().name + data.val().createData);
})
result - >hello1496941142093
My firebase tree
My code is the same as above.
How can I check my recent posts first?
How Do I order reverse of firebase database?
The Firebase Database will always return results in ascending order. There is no way to reverse them.
There are two common workaround for this:
- Let the database do the filtering, but then reverse the results client-side.
- Add an inverted value to the database, and use that for querying.
These options have been covered quite a few times before. So instead of repeating, I'll give a list of previous answers:
- Display posts in descending posted order
- Sort firebase data in descending order using negative timestamp
- firebase sort reverse order
- Is it possible to reverse a Firebase list?
- many more from this list: https://www.google.com/search?q=site:stackoverflow.com+firebase+reverse%20sort%20javascript
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