Problem with virtual scroll data grid angular

Hi Gaylord, 

Thanks for contacting Syncfusion support. 

We suspect that you are mentioning the delay between scroller release and content rendering. If you are mentioning that delay, We would like to inform you that we have used debouncing technique in Virtual scroll. In which we will render the rows, after the scroller is released. Until the Current requested records loaded, translation will be showed. Due to this Remote Data Binding performance will be high and DOM usage will be optimized. 

If you are not mentioning this scenario, please share the video demonstration of the problem, which will help us to validate, and provide a better solution as soon as possible. 

Regards, 

Hello,

Thank you for your reply.

As you can see on the video I just added to you in ZIP, the second scroll and the fifth jump once we stop the scroll. A display jump is very unpleasant to use when scrolling quickly and we do not see how to solve this problem. Can you understand the problem?

Thank you

Hi Gaylord, 

 

Thanks for your update. 

 

Yes, we can understand your problem. As we mentioned earlier,  debouncing technique used in Our Virtual scroll, there might me a fraction of seconds delay. For that delay we applied the translation, that will be showed until the current block records are loaded. While translation removed and the current block records appended to grid, you will see the change in the content( you are mentioning this as jump). This is the default behavior. 

 

Please let us know, if you need further assistance. 

 

Regards, 

Balaji Sekar. 

The jump is very noticeable and it's impossible to know how far the user has scrolled as IDs or any keys will not be loaded until the scrolling has finished. This defeats the illusion of a seamless scrolling list.

Is there a way to disable the debouncing and rather load the next batch before the end of the block is reached?

Thank you.

Hi flo, 

By default in EJ2 Grid Virtual Scrolling we have used debouncing technique, so there might me a fraction of seconds delay. For that delay we applied the translation that will be showed until the current block records are loaded. While translation removed and the current block records appended to grid, you will see the change in the content. This is the default behavior. 

From validating your query we suspect that you like to load the data when the scrollbar reaches the end of the scroller. So we suggest you to use the Infinite Scrolling feature instead of VirtualScroll. To enable Infinite scrolling, set enableInfiniteScrolling property as true. Please refer the below Sample demos and documentation for more information. 

Sample Demo: https://ej2.syncfusion.com/angular/demos/#/material/grid/infinite-scrolling 

Documentation: https://ej2.syncfusion.com/angular/documentation/grid/infinite-scroll/ 

Regards,