plotly / plotly/plotly.js

Hovertemplate not using single text value for all data points

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bug P3
Dominant language
JavaScript
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Merged PRs (30d)
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Description

Hi there 👋, stumbled across this issue while playing around with hovertemplates in Plotly.NET.

The text property can be either set with an array of values (-> every data point gets its own text for hover display), or with a single value (-> every data point gets the same text)

This works well unless the text is used in a hover template. When using an array of text, these values are displayed correctly. But when using a single text for all datums, it does not display on hover.

Expected behavior: Hover template uses the single string of the text property for each hoverlabel
Actual behavior: Hoverlabels display %text

Here is a jsfiddle: https://jsfiddle.net/vsm79h3q/

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the hovertemplate behavior in the linked jsfiddle, comparing an array-valued text property with a single string. Trace the hovertemplate handling for scalar text values and verify that the completed change displays that same string in every hoverlabel instead of %text.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
data-visualization
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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