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Redraw a figure in JupyterLab when its output is updated #5865

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Redraw a figure in JupyterLab when its output is updated #5865

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a96f833
Redraw a figure in JupyterLab when its output is updated
AllenDowney Nov 2, 2026
ae2f196
Changelog entry for #5865
AllenDowney Nov 2, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
- Add support for converting matplotlib reference lines (`axhline`, `axvline`, and horizontal/vertical `axline`) as well as axes-coordinate lines into Plotly layout shapes in `mpl_to_plotly`, including support for date axes [[#5719](https://github.com/plotly/plotly.py/pull/5719)], with thanks to @robertoffmoura for the contribution!

### Fixed
- Fix figures in JupyterLab not redrawing when their output is updated with `update_display_data` (for example `DisplayHandle.update`), which also kept animations in other kernels on their first frame [[#5865](https://github.com/plotly/plotly.py/pull/5865)]
- Fix `mpl_to_plotly` tick marker mirroring, axis positioning, and trace visibility for twinned and overlaid subplots (such as `twinx` and `twiny`) [[#5310](https://github.com/plotly/plotly.py/pull/5310)], with thanks to @robertoffmoura for the contribution!
- Fix `mpl_to_plotly` losing matplotlib axis line colors by exporting the color of each axis's displayed spine to the plotly x and y axis `linecolor` [[#5311](https://github.com/plotly/plotly.py/pull/5311)], with thanks to @robertoffmoura for the contribution!
- Fix concurrent first access to lazily initialized graph object properties, which could raise `ValueError("Invalid value")` [[#5691](https://github.com/plotly/plotly.py/pull/5691)], with thanks to @hb1915 for the contribution!
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12 changes: 10 additions & 2 deletions js/src/mimeExtension.ts
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Expand Up @@ -54,8 +54,16 @@ export class RenderedPlotly extends Widget implements IRenderMime.IRenderer {
*/
renderModel(model: IRenderMime.IMimeModel): Promise<void> {
if (this.hasGraphElement()) {
// We already have a graph, don't overwrite it
return Promise.resolve();
// We already have a graph. Redraw it only if the figure has changed,
// as it does when a kernel sends update_display_data. (createGraph
// stores a PNG of the figure in the model, which calls renderModel
// again with the same figure.)
const previous = this._model?.data[this._mimeType];
if (JSON.stringify(previous) === JSON.stringify(model.data[this._mimeType])) {
return Promise.resolve();
}
this._model = model;
return this.createGraph(model);
}

// Save off reference to model so that we can regenerate the plot later
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