Combining Angular subscriptions to fetch multiple data streams

Question

Combining Angular subscriptions to fetch multiple data streams

I am looking to retrieve the most recent subscription from a group of subscriptions.

Whenever the value of my FormControl changes, I want to capture only the latest value after the user has finished typing. Below is the code snippet I am using -

let control = this.register.controls['email'];
control.valueChanges.debounceTime(300).pipe(take(1)).subscribe(newValue => {
  console.log(newValue);
})

However, this code returns multiple Subscriptions. How can I ensure that I only get the latest one?

Thank you!

javascript angular typescript rxjs

Answer 1

Answer №1

To solve this issue, consider utilizing either withLatestFrom or combineLatest. However, the recommended approach is to employ withLatestFrom

The usage of take(1) will only capture the initial value before ceasing observation.

this.formGroup.get('nom').valueChanges
.pipe(
  debounceTime(300),
  // combineLatest()
  withLatestFrom()
).subscribe(updatedValue => {
  console.log(updatedValue);
});

Take a look at: https://stackblitz.com/edit/angular-formcontrol-example-seyfto

Answer 2

To solve this issue, consider utilizing either withLatestFrom or combineLatest. However, the recommended approach is to employ withLatestFrom

The usage of take(1) will only capture the initial value before ceasing observation.

this.formGroup.get('nom').valueChanges
.pipe(
  debounceTime(300),
  // combineLatest()
  withLatestFrom()
).subscribe(updatedValue => {
  console.log(updatedValue);
});

Take a look at: https://stackblitz.com/edit/angular-formcontrol-example-seyfto

Answer 3

Answer №2

One option is to implement the withlatestfrom method.

let inputField = this.formGroup.controls['input'];
inputField.valueChanges.debounceTime(300).pipe(withLastestForm(inputField.valueChanges)).subscribe(updatedValue => {
  console.log(updatedValue);
})

Feel free to modify this code as needed

Answer 4

One option is to implement the withlatestfrom method.

let inputField = this.formGroup.controls['input'];
inputField.valueChanges.debounceTime(300).pipe(withLastestForm(inputField.valueChanges)).subscribe(updatedValue => {
  console.log(updatedValue);
})

Feel free to modify this code as needed

Combining Angular subscriptions to fetch multiple data streams

Answer №1

Answer №2

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