Add support for reactive Plotly bar chart. #7733
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Pull request overview
This pull request adds support for reactive bar chart selections in Plotly visualizations. Similar to the existing support for scatter plots, heatmaps, and other chart types, users can now select bars in Plotly bar charts using box selection and retrieve the selected bar data as a list of dictionaries in Python.
Key changes:
- Added bar chart extraction logic with both numpy-optimized and fallback implementations
- Comprehensive test coverage with 15 new test cases covering various bar chart scenarios
- Included a detailed example demonstrating the feature with multiple bar chart types
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| marimo/_plugins/ui/_impl/plotly.py | Core implementation: added _extract_bars_numpy, _extract_bars_fallback, _extract_bars_from_range, and _append_bar_items_to_selection functions to handle bar chart selection logic for both vertical and horizontal bars with categorical and numeric axes |
| tests/_plugins/ui/_impl/test_plotly.py | Comprehensive test suite with 15 tests covering basic selection, horizontal/vertical orientation, categorical/numeric axes, stacked/grouped bars, edge cases, and numpy/fallback parity |
| examples/third_party/plotly/bar_chart.py | Example notebook demonstrating reactive bar chart selections with simple vertical, stacked, grouped, and horizontal bar charts |
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mscolnick
approved these changes
Jan 8, 2026
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🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.18.5-dev182 |
mscolnick
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Jan 8, 2026
## 📝 Summary <!-- Provide a concise summary of what this pull request is addressing. If this PR fixes any issues, list them here by number (e.g., Fixes #123). --> Similar to #7546, we also want Plotly line charts to be reactive. (Also see #7733) ## 🔍 Description of Changes <!-- Detail the specific changes made in this pull request. Explain the problem addressed and how it was resolved. If applicable, provide before and after comparisons, screenshots, or any relevant details to help reviewers understand the changes easily. --> <img width="1013" height="1006" alt="image" src="https://github.com/user-attachments/assets/f4b7f497-c46c-4313-8dbc-a5bcff592964" /> ## 📋 Checklist - [x] I have read the [contributor guidelines](https://github.com/marimo-team/marimo/blob/main/CONTRIBUTING.md). - [ ] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on [Discord](https://marimo.io/discord?ref=pr), or the community [discussions](https://github.com/marimo-team/marimo/discussions) (Please provide a link if applicable). - [x] I have added tests for the changes made. - [x] I have run the code and verified that it works as expected.
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📝 Summary
Similar to #7546, we also want Plotly bar charts to be reactive
🔍 Description of Changes
I tried to stay as close as possible to how this works in Altair.
Happy to address any remarks you might have.
📋 Checklist