Carto multiple maps single HTML

Question

I need to display two or multiple Carto Maps on the same HTML. No problem with the first map but the second is not displayed properly. I don't understand it. What's the right way to do it? Here is my html prototype http://pixelius.es/labs/servmet with the following code:

var mapDimarts;
var mapDimecres;

function servmet(){
    mapDimarts = new L.Map('cartodbDimarts', {
        center: [41.75, 2.18],
        zoom: 7
    });

    mapDimecres = new L.Map('cartodbDimecres', {
        center: [41.75, 2.18],
        zoom: 7
    });

L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
    attribution: 'Mapbox <a href="http://mapbox.com/about/maps" target="_blank">Terms &amp; Feedback</a>'
}).addTo(mapDimarts);

L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
    attribution: 'Mapbox <a href="http://mapbox.com/about/maps" target="_blank">Terms &amp; Feedback</a>'
}).addTo(mapDimecres);

cartodb.createLayer(mapDimarts, 'https://pixelius.carto.com/api/v2/viz/1f0fd8ee-9c22-4571-8b25-ef549d716c8f/viz.json')
    .addTo(mapDimarts)
    .on('error', function(err) {
  alert("some error occurred: " + err);
});

cartodb.createLayer(mapDimecres, 'https://pixelius.carto.com/api/v2/viz/6f8ec189-c208-4c5f-9aa2-6cc9ebbc52ac/viz.json')
    .addTo(mapDimecres)
    .on('error', function(err) {
  alert("some error occurred: " + err);
});

}

window.onload = servmet;

Answer 1

The map is initialised when the map container is not visible. So the map is present but of an incorrect size.

I would set up a trigger on the tab to resize the map when/if the tab is clicked...

function predicDia(e,a){
   mapDimecres.invalidateSize(true);