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Category: Kendo grid virtual scrolling

Kendo grid virtual scrolling

Kendo grid virtual scrolling

When virtual scrolling is enabled, the Grid loads data from its remote data source while the user scrolls vertically. In virtual scrolling, the HTML output is different from the standard scrolling functionality—the data table of the Grid is not placed inside a scrollable container. The scrollbar belongs to a separate div. When the user scrolls a Grid in its virtual-scrolling mode, the Grid renders the table rows for the reached scroll position on the fly.

If the Gris uses local data or if its remote data has already been loaded and cached, the rendering rate and performance of the widget depend on:. If the total number of items is large and the scrolling is fast, the table of the Grid can be re-rendered frequently.

Kendo grid virtual scrolling

If, additionally, the page size is huge, the user might observe issues with the smoothness of the scrolling. In such cases, reduce the page size and increase the Grid height to improve the scrolling performance. Virtual scrolling relies on a fake scrollbar. Its size is not determined by the browser but is calculated based on the average row height of the data that is already loaded. As a result, variable row heights may cause unexpected behavior such as an inability to scroll to the last rows on the last page.

To ensure that all table rows have the same heights, use either of the following options:. On mobile devices where a scrollbar that can be grabbed and dragged is not visible, virtual scrolling of a large number of data items for example thousands might hinder the easy access to all table rows because the large number of data items will require a great deal of touch scrolling. On the other hand, using virtual scrolling with a very small number of items for example, less than does not make much sense.

Virtual scrolling on touch devices relies on drag-and-drop events, which are slower than native scrolling. This might lead to performance issues. When virtual scrolling is not supported or recommended and depending on the number of data items, either revert to standard paging or to non-virtual scrolling without paging.

All Rights Reserved. See Trademarks for appropriate markings. Kendo UI for jQuery. In this article. Not finding the help you need? Contact support. Was this article helpful? Tell us how we can improve this article. Submit Skip.

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Community Forums Blogs Feedback Portal.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. It looks like, whenever i scroll up or down, there's this weird refresh, in which i see for a sec the old detail item opened, replaced right after with the new items.

This "glitch" is observable for a second until the table is repainted.

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Maybe we can show loading panel or something while scrolling? Same behavior here What i would like to say is that i think a loading panel is not a solution. User would like just to scroll, not see loading panel. So thanks. Loading panel would be great. I repeat: a loading panel is not a solution. Fix that issue introducing a new graphical element is not correct. We have all data already available.

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We just need a callback that works not showing wrong values. I see what you mean. I agree that it should continue to scroll while loading, but if you reach the end of the current batch of items before your webservice answers it could be nice for the user to know that data is going to be displayed soon.

Maybe just a text info "loading data We have already done some improvements in this area. I agree with meriturva. I've tried it with a remote web api and the behavior is too annoying. It's unusable by the final user. Is it possible to have a timing for a next release with at least a loading panel? Thanks in advance. About behavior for the user, after a bit of testing I think virtual scrolling is not a good solution. Infinite scroll is much better in most cases. Agreeing with meriturva and FedericoGalfright now virtual scrolling with a remote api is not really usable, the behavior of the grid under these circumstances really needs to be improved.

We've added a demo on how to Debounce pageChange Events. This should make remote calls practical. Tracking in Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.Posted 10 Feb Link to this post. I am evaluating Kendo UI Grid trial version to replace a third party grid control being used in one existing web forms application. Environment : ASP.

NET Framework 4. NET Framework 2. Browser : IE I am trying to implement Virtual scrolling with Remote data. But it is not working. Data is only visible up to the height of the grid. Scroll bar is not appearing.

Setting serverPaging: true, serverSorting: true does not show any data. Could anyone tell me where I am going wrong? The server side function GetData invokes database stored procedure which returns all data. It will not be possible to implement paging in the store procedures as there are a very large number of different grids aka stored procedures.

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If this is the cause of Virtual Scrolling not working, please suggest me the work around. SerializeObject dvw. Posted 11 Feb Link to this post. Posted 11 Feb in reply to Peter Filipov Link to this post. Posted 15 Feb Link to this post. Posted 15 Feb in reply to Peter Filipov Link to this post.

SerializeObject ds. Posted 16 Feb in reply to Madhuchhanda Link to this post. Posted 17 Feb Link to this post.

kendo grid virtual scrolling

Posted 24 Jan Link to this post. For me the scrolling is very buggy, my configuration is fairly standard, is this a known issue?

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Posted 26 Jan Link to this post. Posted 30 Mar Link to this post. I know this is an old post from but I am having issues with virtual scrolling not working after sorting on a column. Only the pagesize is returned and after that scrolling does not get back more results.

Posted 01 Apr Link to this post. Based on the provided information, I cannot be sure what might be causing the issue. The following live demo implements the virtual scrolling functionality along with the sorting. Is it possible for you to modify the example in order to replicate the faulty behavior on your side and send it back to me?

All Products. Feed for this thread. Member since: Feb Posted 10 Feb Link to this post I am evaluating Kendo UI Grid trial version to replace a third party grid control being used in one existing web forms application.

DataSetLoad "A", 0. ToTable. The converted JSon data is as follows:.Posted 14 Sep Link to this post. In Kendo grid,if i enable virtual scrolling also,I could not see the loading progress bar in my application.

But in the demo i could see. Kindly help me.

Kendo grid scroll issue

Below is my code. Name "grid". Virtual true. PageSize My another doubt is I need to show,loading symbol with text like ,loading symbol - 1 to 50 records are loading,If i scroll again it should show with loading symbol and records are loading.

Kindly help me out. One more clarification is kindly provide the disadvantages of virtual scolling of kendo grid. Not technical perspective. Usablity perspective. Posted 15 Sep Link to this post.

I assume that the PageSize might be the reason why the loading icon is not shown. Could it be possible that the number of total items is less or equal to ? I prepared a sample project that implements virtual scrolling and it works fine.

Due to the nature of the virtualization such functionality could not be implemented. The main idea of virtualization is to pre-fetch the data so the items will be loaded before they are actually needed. For example the user has not reached the 3rd page of items when they are requested. Given this if you try to implement such logic it is quite possible to face significant differences between the data that is being requested and the data that is currently shown in the grid.

All Products. Kendo grid virtual scrolling Cancel The title field is required! Feed for this thread. Member since: Jul Kindly help me out 3.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am working on a kendo web aaplication. I have a kendo grid and virtual scrolling is enabled.

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Last row is missing while scrolling the grid but i can see that record by filtering. In IE it is working perfectly. If a change total row number to 12 last row is missing in chrome but still IE is perfect.

I was face an issue line initially scroll bar is not visible but I fix that issue by using below code. Virtual scrolling relies on calculations about the average row height, which is used to calculate the height of the fake vertical scrollbar. Learn more. Asked 4 years, 8 months ago. Active 3 years, 3 months ago. Viewed 2k times. Inital scroll is ok now. Any help for last row missing? Active Oldest Votes.

I also faced similar issue. It got resolved after specifying height of grid. TheCoder TheCoder 11 4 4 bronze badges. Sign up or log in Sign up using Google.

Kendo Grid Virtual Scrolling not working

Sign up using Facebook.While the user is scrolling the table, the Grid requests and displays only the visible pages. To define the virtual scrolling functionality, set scrollable to virtual. Generally, to determine when a pageChange event has to be fired so that the Grid obtains and displays the next or the previous portion page of data items, the virtual scrolling functionality of the Grid relies on calculations that are based on the fixed and equal rowHeight of the rows, the set pageSize of the Grid, and the scrollTop position of the scrollable data table container.

In master-detail scenarios, you have to predefine both rowHeight and detailRowHeight to ensure the proper functioning of the data virtualization, loading, and rendering of the correct items. You can use virtual scrolling in combination with grouped data by utilizing the kendoGridGroupBinding directive. The directive supports only the processing of in-memory data and you have to provide the full set of data that will be processed.

The virtual scrolling functionality requires that all Grid rows have an equal, predefined height. However, you can still keep virtual scrolling and use responsive columns which have different cell templates based on the column width. When configured for virtualization, the Grid fires the pageChange event as often as possible. This behavior allows for a smoother scrolling experience when the data is available in memory. If the data is requested from a remote service, it is advisable to debounce or otherwise limit the page changes.

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kendo grid virtual scrolling

Progress enables you to rapidly develop and deliver applications that drive customer success. Kendo UI for Angular. Start Theming. In this article. Was this article helpful? Other By checking this box you consent to Progress contacting you by email about your response on this page.For runnable examples, refer to the demo on virtualization of remote data by the Grid. When virtual scrolling is enabled, the Grid loads data from its remote data source while the user scrolls vertically.

In virtual scrolling, the HTML output is different from the standard scrolling functionality—the data table of the Grid is not placed inside a scrollable container.

The scrollbar belongs to a separate div. When the user scrolls a Grid in its virtual-scrolling mode, the Grid renders the table rows for the reached scroll position on the fly. If the Gris uses local data or if its remote data has already been loaded and cached, the rendering rate and performance of the widget depend on:.

If the total number of items is large and the scrolling is fast, the table of the Grid can be re-rendered frequently. If, additionally, the page size is huge, the user might observe issues with the smoothness of the scrolling.

In such cases, reduce the page size and increase the Grid height to improve the scrolling performance. Virtual scrolling relies on a fake scrollbar. Its size is not determined by the browser but is calculated based on the average row height of the data that is already loaded. As a result, variable row heights may cause unexpected behavior such as an inability to scroll to the last rows on the last page.

To ensure that all table rows have the same heights, use either of the following options:. On mobile devices where a scrollbar that can be grabbed and dragged is not visible, virtual scrolling of a large number of data items for example thousands might hinder the easy access to all table rows because the large number of data items will require a great deal of touch scrolling.

On the other hand, using virtual scrolling with a very small number of items for example, less than does not make much sense. Virtual scrolling on touch devices relies on drag-and-drop events, which are slower than native scrolling. This might lead to performance issues.

When virtual scrolling is not supported or recommended and depending on the number of data items, either revert to standard paging or to non-virtual scrolling without paging. All Rights Reserved. See Trademarks for appropriate markings.

kendo grid virtual scrolling

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