本文整理匯總了TypeScript中rxjs/BehaviorSubject.BehaviorSubject.switchMap方法的典型用法代碼示例。如果您正苦於以下問題：TypeScript BehaviorSubject.switchMap方法的具體用法？TypeScript BehaviorSubject.switchMap怎麽用？TypeScript BehaviorSubject.switchMap使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類rxjs/BehaviorSubject.BehaviorSubject的用法示例。
在下文中一共展示了BehaviorSubject.switchMap方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
示例1: it
it('should handle dynamic queries that return empty sets', async (done) => {
const ITEMS = 10;
let count = 0;
let firstIndex = 0;
let pricefilter$ = new BehaviorSubject<number|null>(null);
const randomCollectionName = randomName(afs.firestore);
const ref = afs.firestore.collection(`${randomCollectionName}`);
let names = await createRandomStocks(afs.firestore, ref, ITEMS);
const sub = pricefilter$.switchMap(price => {
return afs.collection(randomCollectionName, ref => price ? ref.where('price', '==', price) : ref).valueChanges()
}).subscribe(data => {
count = count + 1;
// the first time should all be 'added'
if(count === 1) {
expect(data.length).toEqual(ITEMS);
pricefilter$.next(-1);
}
// on the second round, we should have filtered out everything
if(count === 2) {
expect(data.length).toEqual(0);
sub.unsubscribe();
deleteThemAll(names, ref).then(done).catch(done.fail);
}
});
});示例2: it
it('should handle dynamic queries that return empty sets', done => {
const ITEMS = 10;
let count = 0;
let firstIndex = 0;
let namefilter$ = new BehaviorSubject<number|null>(null);
const aref = createRef(rando());
aref.set(batch);
namefilter$.switchMap(name => {
const filteredRef = name ? aref.child('name').equalTo(name) : aref
return snapshotChanges(filteredRef);
}).take(2).subscribe(data => {
count = count + 1;
// the first time should all be 'added'
if(count === 1) {
expect(Object.keys(data).length).toEqual(3);
namefilter$.next(-1);
}
// on the second round, we should have filtered out everything
if(count === 2) {
expect(Object.keys(data).length).toEqual(0);
}
}).add(done);
});