Troubleshooting Drag and Drop problems in Angular

My list consists of simple elements created with the mat-card component. I want to be able to highlight the mat-card when dragging a file over it, and perform some action when the file is dropped. However, I'm facing two main issues:

  • At times, when I drag too quickly, the status of the mat-card does not update correctly, resulting in multiple cards being highlighted.
  • The e.preventDefault() function on the drop event doesn't work as expected - the file ends up opening in the browser instead of triggering the desired behavior.

I've tried various solutions, including manually adding and removing event listeners, but nothing seems to resolve the problem. Hopefully, someone will be able to provide some assistance :)

For easier debugging, I have set up a demo using stackblitz. You can access it here: https://stackblitz.com/edit/angular-material-with-angular-v5-d2uted

Update: Currently using Angular v5 and Angular Material 2

javascriptangulartypescriptdrag-and-dropangular-material

Answer №1

Through some investigation, it was discovered that in order to prevent the browser from opening the file, both the dragover and drop events need to be prevented. To resolve the issue of the class being applied multiple times, I switched to using ngClass instead of ngIf, resulting in more consistent functionality. Take a look at this stackblitz demo for reference.

Answer №2

To address the initial problem, it seems that the delay is caused by Angular's lifecycle not being sufficiently fast. One solution could be to refrain from using Angular's context for updating elements, or explore alternative methods of notifying the user about their interaction with the application.

As for the second issue, you can prevent the default behavior by adding a host listener for the window:dragover event:

@HostListener('window:dragover', ['$event'])
windowDragOver(event: Event) {
  event.preventDefault();
}

Check out this Stackblitz example for more information.

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