分页使用AngularFire2 [英] Pagination using AngularFire2
问题描述
从AngularFire2的文档中,我得到了如下的东西:
$ b $
const queryObservable = af.database.list('/ items',{
query:{
orderByChild:'size ',
equalTo:subject
}
});
这个效果很好。我有大约300-400条记录,但是我无法在一个API调用中完成。所以我正在尝试实现分页。我尝试了很多东西。我想实现的是这个:
StartAt(),endAt()
我试图通过查询对象,但它没有工作。
AngularFire2是否有这个实现?
如果没有,我怎样才能得到Firebase的ref,这样我就可以编写我自己的实现了?
AngularFire2不会根据 startAt 和 endAt
blob / master / src / database / firebase_list_factory.tsrel =nofollow>源代码。以下是你如何限制你的查询基于一个列表大小
:
let queryObservable = this.af.database.list('/ items',{
query:{
orderByChild:'size',
startAt:50,
endAt:100
}
});
这应该将所有具有 注意我注意到如果我将一个引用对象传入AngularFire2的查询路径,查询将 NOT 工作!所以下面的代码仍然会返回项目列表,但不会被正确排序。 I am building an Ionic2 project, that uses Firebase and I am using AngularFire2. From AngularFire2 documentation, I was able to get things like: This works well. I have around 300-400 records, but I can't pull it all in one API call. So I am trying to implement pagination. I tried many things. What I want to implement is this: I tried to pass it through the query object, but it did not work.
Does AngularFire2 have an implementation for this?
If not, how can I get the Firebase ref so that I can write my own implementation? AngularFire2 does support This should pull all the items that have a child key of NOTE I have noticed that if I were to pass in a reference object into AngularFire2 instead of a reference path, the query will NOT work! So the code below will still return the list of items but it will not be sorted properly.
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定义在50到100之间。
let ref = firebase.database( ).REF( '/项目');
this.af.database(ref,{query:{orderByChild:'size'}});
const queryObservable = af.database.list('/items', {
query: {
orderByChild: 'size',
equalTo: subject
}
});
StartAt(), endAt()
startAt
and endAt
according to their source code. Here's how you would limit your query based on a list with a child key of size
:let queryObservable = this.af.database.list('/items', {
query: {
orderByChild: 'size',
startAt: 50,
endAt: 100
}
});
size
defined between 50 to 100.let ref = firebase.database().ref('/items');
this.af.database(ref, { query: { orderByChild: 'size' } });