取消ngFormControl事件触发

Question

我有一个搜索字段的ngFormControl，我订阅了如下：

this.searchTerm.valueChanges
  .debounceTime(400)
  .distinctUntilChanged()
  .switchMap(searchTerm => this.locationSearchService.search(searchTerm))
  .subscribe(items => { doSomethingPartiallyInteresting() })

在某些情况下，我想取消.valueChanges事件触发。有谁知道这是不可能的吗？

Answer 1

也许您可以利用filter运算符：

this.searchTerm.valueChanges
  .debounceTime(400)
  .distinctUntilChanged()
  .filter(() => { // <------------
    return !(this.address === 'don't handle this address'); 
  })
  .switchMap(searchTerm =>  this.locationSearchService.search(searchTerm))
  .subscribe(items => { doSomethingPartiallyInteresting() })