MediaWiki:Common.js

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$(document).on('change', 'input[name="address"]', function() {
    const addr = $(this);
    const lat  = $('input[name="latitude"]');
    const lon  = $('input[name="longitude"]');

    const q = encodeURIComponent(addr.val());
    if (!q) return;

    const url = 'https://nominatim.openstreetmap.org/search?format=json&q=' + q;

    $.getJSON(url, function(data) {
        if (data && data.length > 0) {
            lat.val(data[0].lat);
            lon.val(data[0].lon);
        }
    });
});