Features not displayed with style_function
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 38/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- jupyter-notebook, python
- Domain
- data-visualization
Research direction
Start by running the issue's GeoJSON reproduction in Jupyter Notebook with and without style_function, using the attached demo.json data. Trace the Folium GeoJson styling path and verify completion when LineString features render with the requested color, weight, opacity, and dashArray.
Written by the indexing model from the issue text.
Description
Describe the bug
When loading a set of GeoJSON LineString features, they are not displayed on the Folium map in my Jupyter Notebook (GColab, as well) when using style_function. If style_function=style_functions is removed from the following code, the features are displayed correctly, even though without styling.
To Reproduce
import folium
import json
# Load the GeoJSON file
with open('demo.json') as f:
data = json.load(f)
# Create a Folium map centered on a location of your choice
m = folium.Map(location=[37.982759260869564, 23.901986296376812], zoom_start=18)
# Define a style function that changes the color of LineString features
def style_functions(feature):
color = 'red' # Change the color to your desired color or use a custom logic
return {
'color': 'blue',
'weight': 3,
'opacity': 0.7,
'dashArray': [5, 10]
}
# Add the GeoJSON data to the map with the style function applied
folium.GeoJson(data, style_function=style_functions).add_to(m)
# Display the map
m
Demo GeoJSON has been attached. Please remove the .txt extension for it to load.
demo.json.txt
Expected behavior
style_function should not hide the features, but display them with the styling specified.
Environment (please complete the following information):
- Browser [e.g. firefox]
- Jupyter Lab & Google Colab
- Python 3.10.12
- folium 0.14.0
- branca 0.6.0
Additional context
In a similar test, PointString features were correctly displayed, with or without the style_function argument.
- Dominant language
- Python
- Stars
- 7.4k
- Forks
- 2.3k
- Avg merge
- 17h 22m
- Merged PRs (30d)
- 11
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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