[英]RxJS: How does shareReplay not store null values ?
let btn = document.getElementById('btn')
let input = document.getElementById('input')
let input$ = defer(() => of(input.value)).pipe(
tap(v => console.log('tap', v)),
filter(v => v),
shareReplay(1)
)
let click$ = fromEvent(btn, 'click').pipe(
switchMap(_ => input$)
)
click$.subscribe(v => console.log(v))
我只想在輸入值不為null時存儲input $。 現在的問題是,如果輸入的值最初為null,則它已經存儲,過濾器無法正常工作。
演示鏈接
您可以嘗試一下,在輸入$之前輸入if-else
let btn = document.getElementById('btn')
let input = document.getElementById('input')
if (input != null){
let inputValue = input
}
let input$ = defer(() => of(inputValue.value)).pipe(
tap(v => console.log('tap', v)),
filter(v => v),
shareReplay(1)
)
let click$ = fromEvent(btn, 'click').pipe(
switchMap(_ => input$)
)
click$.subscribe(v => console.log(v))
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