The traditional function does not have access to a reference to this

For my web development project with Angular 9, I needed to add a typeahead feature using ng bootstrap typeahead. The code provided below worked perfectly:

search = (text$: Observable<string>) =>
    text$.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      switchMap(term =>
        this.GameService.getCode(term).pipe(
          catchError(() => {
            return of([]);
          }))
      ),
    )

However, I encountered an issue when testing in Internet Explorer due to lack of support for arrow functions. To address this problem, I made adjustments to the code as shown below:

search = function(text$: Observable<string>) {
    return text$.pipe(
      debounceTime(150),
      distinctUntilChanged(),
      switchMap(term => {
        let self = this;  
        return self.GameService.getCode(term).pipe(
          map((res) => {
            this.isSearching = false;
            return res;
          }),
          catchError(() => {
            return of([]);
          }))
      }
      ),
    )
  }

I now need to find a way to customize this code to ensure compatibility with Internet Explorer.

Answer №1

Consider setting up the variable let self = this prior to starting the function.

By utilizing a function expression, you risk losing the scope of your code and the ability to reference this - therefore, it's important to store your this before diving into your initial function.

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