CODEWITHSUNDEEP
angularrxjs
alchi baucha
alchi baucha

Reputation: 1040

Conditional distinctUntilChanged in angular 2

I have a filter class that I inherit wherever I want filter functionality.

export class FilterUtil{
…
  public extFilterSubject = new Subject<any>();
  constructor(){
    this.extFilterSubject
      .pipe(map(event => event)
        , debounceTime(300)
        , distinctUntilChanged())
      .subscribe((searchKeyword) => {
         //filter logic here.
      })
   }
}

This works.

The thing I want to accomplish is to apply distinctUntilUnchanged conditionally. I have come across one of the cases where I don't want distinctUntilUnchanged operator.

I looked into the official docs for distinctUntilUnchanged. But I couldnot find anything relevant.

Thanks.

Upvotes: 0

Views: 1538

Answers (1)

Nugu
Nugu

Reputation: 848

It can only compare current value with the last value emitted. If you would want to apply your own condition.

distinctUntilChanged((valueOne: any, valueTwo: any) => {
            if (Your Condition) {
                return true; // This means values are equal, it will not emit the current value
            } else {
                return false;// This means the values are different, so it will emit
            }
        })

Upvotes: 6

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