Why Can't I Download My Leaflet Map When It's Inside a Data-Toggle Tab?

Data-Toggle Tab Hinders Leaflet Map Download

This question arises when a Leaflet map within a data-toggle tab fails to download properly. The map previously functioned when displayed outside the tab.

Cause

Leaflet initializes the map upon reading the container size. When the container is initially hidden or its dimensions are altered, Leaflet remains unaware of the changes, leading to incorrect tile downloads. This issue is common when using tab or modal panels in frameworks such as Bootstrap.

Solution

Trigger a container size update by calling map.invalidateSize() when the tab panel is displayed. This can be done through a listener on the tab button click.

Tab Button Click Listener Implementation

For implementation of the tab button click listener, refer to Stack Overflow or framework-specific documentation.

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