Request created for backend are inefficient and really difficult when doing lazy loading with Grid
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- Dominant language
- Java
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Description
Vaadin version: 8.0.5
Grid requests same rows multiple times. This log is from a simple test app that fits 17 rows on the initial screen, then scrolled down. The backend has 100 rows in total. First three requests to the backend comes without scrolling, rest while scrolling down:
Request: offset 0 limit40
Request: offset 40 limit50
Request: offset 50 limit40
Request: offset 80 limit19
Request: offset 95 limit5
Reproducible with this:
https://github.com/mstahv/lazy-loading-spring-demo/tree/bugreport (note, no mysql needed for this special branch)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked lazy-loading-spring-demo bugreport branch and reproduce the logged request sequence while scrolling a 100-row dataset. Trace the Grid lazy-loading request path; done means avoiding repeated or inefficient row requests without breaking initial rendering or scrolling.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- backend, frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100