angular-ui/ui-grid

CellNav - multi cell selection gets cleared after scrolling

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#4,936 opened on Jan 7, 2016

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help wanted

Description

Hi,

There is an issue with MultiSelectCells functionality of CellNav module. I can select multiple cells using CTRL + cell selection, however after scrolling the grid (up or down) the multi-selection gets cleared and only the first cell from the collection remains highlighted.

It can be reproduced in the CellNav tutorial: http://ui-grid.info/docs/#/tutorial/202_cellnav

  1. Select multiple cells using CTRL + selection
  2. Scroll the grid up/down
  3. Observe the selections disappearing.

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of AngularFamiliarity with ui grid CellNav module
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
The bug is that multi cell selection clears after scrolling. The issue likely lies in the CellNav module's scroll event handling. Examine the 'cellnav.js' file for selection state management during scroll. The fix should preserve the selected cells set when rows are re rendered or viewport changes. No comments or PRs exist, so the exact cause needs investigation.