Why is the map not showing up right away?

Question

JavaScript

Faced such a problem. I made two maps on the site, only they are displayed by clicking on a certain button. But the problem is that by clicking on the button I get a block with information, but the map is not displayed, it is only necessary to make some manipulations with the browser window, for example, slightly reduce it, and the map appears immediately. Tell me where to dig so that it is immediately displayed?

<button type="button" id="lar-btn-voronez" onclick="document.getElementById('voronez-map').style.display='block';document.getElementById('samara-map').style.display='none'">Воронеж</button>
<button type="button" id="lar-btn-samara" onclick="document.getElementById('voronez-map').style.display='none';document.getElementById('samara-map').style.display='block'">Самара</button>

Answer 1

As far as I remember, in the case of Google Maps, you need to call
after the block appears.