leaflet only renders into one corner

Question

I have a leafletmap that only renders into one corner. When I resize the browser window, the whole map renders.

That is how I invoce the map

var map = L.map('map', 
{ crs: L.CRS.EPSG3857 }
).setView([105.2, 100], 6);

var tiles = L.tileLayer('http://stamen-tiles-{s}.a.ssl.fastly.net/toner/{z}/{x}/{y}.{ext}', {
attribution: 'Map tiles by <a href="http://stamen.com">Stamen Design</a>, <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> &mdash; Map data &copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>',
    subdomains: 'abcd',
    ext: 'png'
}).addTo(map);

And this is my css

.myContainer {
    width: 1024px;
    height: 800px;
    position: relative;
}

.map {
    width: 1024px; 
    height: 800px; 
    z-index: 0;
}

The map is wrapped in a container. Everything I found online regarding this problem points to relative sizes in the map- or its parent container. However, I have absolute sizes. I load the .css before the .js (where I initialize the map). The map will be displayed not on the startpage, but when you click on a submenue point.

Why is the map not rendered properly?

Answer 1

The map will be displayed not on the startpage, but when you click on a submenue point.

You're initializing the map on a hidden or zero-size container, which makes this question a duplicate of 2nd leaflet map not rendering correctly

The answer is the same: run map.invalidateSize() whenever the map should become visible, or when you change its dimensions or visibility.

Answer 2

As IvanSanchez stated, map.invalidateSize() is indeed the way to go.

A useful code example for map refresh every 2 seconds in Javascript would be:

//Using setInterval can help the reloading or refreshing of the map itself.
  setInterval(function() {
     map.invalidateSize();
  }, 2000);

...Note that setInterval() counts time in milliseconds so for example , 2000 are 2 seconds.

map in map.invalidateSize() is the name of the variable you set your map to when you initialized it:

Map initialization example:

var map = L.map(...