[英]Rxjs combinelatest observable value is undefined
我有以下代碼,其中 Obs2 依賴於 Obs1。 但是,當我使用 combineLatest 時,Obs1 的值一直未定義。 我怎樣才能讓它工作? 我基本上只需要 Obs2$ 來過濾掉 Obs1$ 中存在的值。
this.Obs2$ = this.dataService.getObs2(this.id);
this.Obs1$ = this.dataService.getObs1(this.id)
.pipe(
map(item => {
return item.prop1
}),
tap( val => console.log('the tapped value: ', val)) // shows undefined
);
this.CombinedObs$ =
combineLatest(this.Obs1$,this.Obs2$)
.pipe(
map(([Obs1,Obs2]) => {
return Obs2
.filter(t => !Obs1.includes(t.prop1)) //obs1 keeps coming in as undefined
.map(item => {
return {
entityId: item.teamId,
entityName: item.teamName,
entityCategory: ''
}})
})
)
我得到了你做錯的問題是在 map pipe,如果返回結果,請告訴我:
this.Obs2$ = this.dataService.getObs2(this.id);
this.Obs1$ = this.dataService.getObs1(this.id)
.pipe(
map(items => items.map(item => item.prop1)), // Issue was here
tap( val => console.log('the tapped value: ', val)) // It will not show undefinded now
);
this.CombinedObs$ =
combineLatest(this.Obs1$,this.Obs2$)
.pipe(
map(([Obs1,Obs2]) => {
return Obs2
.filter(t => !Obs1.includes(t.prop1)) //obs1 keeps coming in as undefined
.map(item => {
return {
entityId: item.teamId,
entityName: item.teamName,
entityCategory: ''
}}) // I'm sure you will get error over here so please review and handle that accordingly
})
)
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