Map Simple

by Lawrence Ross

HTML

<div style="display:none;"  id="divMap">
<div id="map" style="width:300px; height:300px;"></div>
</div>
<button onclick="showMap();">show map</button>

<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap" async defer></script>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

var map;
var mapCenter = {lat: -34.397, lng: 150.644};
function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    center: mapCenter,
    zoom: 8
  });
  var marker = new google.maps.Marker({
  map:map,
  position: map.getCenter()
  })
}

function showMap(){

document.getElementById("divMap").style.display = 'block'
google.maps.event.trigger(map, 'resize');
map.setCenter(mapCenter);

}