Is there an alternative method to invoke the function aside from setTimeOut()?

Question

Is there an alternative method to invoke the function aside from setTimeOut()?

if(i==1){
        this.resetScreens();
        this.editJobScreen1 = true;
    if(this.selectedLocations.length > 0){
        this.locationService.getLocationByInput({
          maxResultCount:16,
          skipCount: 0
        }).subscribe((ele)=>{
          this.Regions = ele.items;
          this.Regions.forEach((element) => {
          this.HiringRegionMapComponent.list.push(element.id);
        });
        })
        for(let i=0;i<this.selectedLocations.length;i++){
          setTimeout(() => {
            this.HiringRegionMapComponent?.addColor(this.selectedLocations[i].id);
          }, 150);
        }

      }
    }

Concern

An issue arises when attempting to color regions on an SVG map based on their ID. This problem occurs within a specific function triggered by the user pressing the back button. The use of setTimeOut() appears to resolve the issue, but occasionally leads to the function addColor() breaking (approximately 2 out of 20 times). A stable solution is sought to avoid these intermittent failures.

Anticipated Solution

Technologies:

Angular (11.0.0)
.NET Core (5.0)

A viable approach to address the predicament

angular typescript svg

Answer 1

Answer №1

It seems like the issue may be due to nearing the end of Angular's context.

Instead of relying on setTimeout or other methods that are monkey-patched for change detection, consider using NgZone for better control. Alternatively, triggering the change detection manually can also be a more effective approach. Lastly, it's advisable to stay within Angular's context as much as possible to avoid potential problems.

// NgZone

constructor(private zone: NgZone) {}

// ...

this.zone.run(() => {
  if (i == 1) 
  // ...
});

// Change detector

constructor(private cdRef: ChangeDetectorRef) {}

// ...

for(let i=0;i<this.selectedLocations.length;i++) {
  // ...
}
this.cdRef.detectChanges();

Answer 2

It seems like the issue may be due to nearing the end of Angular's context.

Instead of relying on setTimeout or other methods that are monkey-patched for change detection, consider using NgZone for better control. Alternatively, triggering the change detection manually can also be a more effective approach. Lastly, it's advisable to stay within Angular's context as much as possible to avoid potential problems.

// NgZone

constructor(private zone: NgZone) {}

// ...

this.zone.run(() => {
  if (i == 1) 
  // ...
});

// Change detector

constructor(private cdRef: ChangeDetectorRef) {}

// ...

for(let i=0;i<this.selectedLocations.length;i++) {
  // ...
}
this.cdRef.detectChanges();

Answer 3

Answer №2

It seems like your approach may not work effectively if the response time of your service is slower than the designated timeout period.
Consider moving the for loop inside the subscribe function to ensure smoother execution.

Answer 4

It seems like your approach may not work effectively if the response time of your service is slower than the designated timeout period.
Consider moving the for loop inside the subscribe function to ensure smoother execution.

Is there an alternative method to invoke the function aside from setTimeOut()?

Concern

Anticipated Solution

Answer №1

Answer №2

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