palantir/blueprint

Overflow list: add option to keep children mounted

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#3,016 opened on Oct 11, 2018

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Package: coreType: feature requesthelp wanted

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Description

Environment

  • Package version(s): 3.7.0

Feature request

Current overflow list removes children from DOM when its invisible, and they will be loaded again if they be visible again.

Sometimes the operation of remove and create elements costs too much performance and affects other components, like css animation.

If there is an option that allows keep children in the DOM tree (e.g. just set display: none to them), overflow list will have better performance.

Contributor guide

Research direction
Examine the OverflowList component source in the Blueprint repository. Add a prop, e.g., `keepChildrenMounted`, that when true, sets `display: none` on hidden children instead of removing them from the DOM. Ensure the component's layout calculations still work correctly with visible children only.
Tech stack
typescriptreact
Domain
frontend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ReactGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75