Why Does My Leaflet Map Fail to Load in a Data-Toggle Tab?
Nov 24, 2024 pm 06:50 PM
Leaflet Map Fails to Load in Data-toggle Tab
Issue
In a tabbed interface, a Leaflet map within a data-toggle tab fails to load correctly.
Code
Navbar:
<ul class="nav nav-tabs">
<li class="active"><a data-toggle="tab" href="#home">Données principales</a></li>
<li><a data-toggle="tab" href="#carte">Carte</a></li>
</ul>
Content Div:
<div class="tab-content">
<div>
Leaflet Script:
var map = new L.Map('carteBenef');
// Configure the map here
Cause
The issue arises because Leaflet reads the map container size at initialization. When the map is placed in a hidden tab, the container size is not yet valid, resulting in incomplete tile loading.
Solution
To resolve this, you can manually trigger a map size update when the tab containing the map is displayed. This can be achieved by calling map.invalidateSize() on the tab activation event.
Example:
$('a[href="#carte"]').on('shown.bs.tab', function () {
map.invalidateSize(true);
});
This will force Leaflet to re-evaluate the map container size and correctly load the tiles.
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