Why Does My Leaflet Map Fail to Load Within a Data-Toggle Tab Structure?

Data-toggle Tab Interfering with Leaflet Map Initialization

Leaflet maps are known for their ability to display interactive maps on web pages. However, an issue can arise when using Leaflet maps within a data-toggle tab structure, resulting in the map failing to load correctly.

Understanding the Problem

The issue stems from the way Leaflet initializes its maps. It calculates the container size during map creation. If the container is hidden at initialization (e.g., within a hidden tab in the case of data-toggle tabs), Leaflet may not accurately determine its size. This can lead to incorrect tile downloads and incomplete map rendering.

Solution: Manually Updating Container Size

To address this issue, you can manually trigger a container size update using the map.invalidateSize() method. This forces Leaflet to recalculate the container size, allowing it to download tiles correctly and display the map as expected.

Here's how to implement this solution using jQuery:

$(document).on('shown.bs.tab', '#carte', function () {
  map.invalidateSize();
});

In this code, the shown.bs.tab event listener is used to detect when the 'carte' tab is displayed. When this happens, it triggers the map.invalidateSize() function, ensuring the container size is updated and the map is displayed properly.

Additional Notes

• The map.invalidateSize() method should be called only once, when the container is shown for the first time with the correct dimensions.
• This solution is applicable to any situation where the map is initialized within a hidden or dynamically changing container.

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