Google Maps API not popping up - google-maps

Question

So I have a website: terpconnect.umd.edu/~ybencheq and I basically wanted to feature a Google Maps at the bottom of my page. I generated an API key and I have it passed in the key parameter. The URL's in my credentials are: https://terpconnect.umd.edu/~ybencheq/, https://www.terpconnect.umd.edu/~ybencheq/, .terpconnect.umd.edu/ and none of these will work. I get the RefererNotAllowedMapError and sometimes I don't even get an error in my console; it just turns up blank on that part of the page).
Here's what I have:
<!-- Add Google Maps -->
<script>
function myMap()
{
myCenter=new google.maps.LatLng(38.9869, 76.9426);
var mapOptions= {
center:myCenter,
zoom:12, scrollwheel: false, draggable: false,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
var map=new google.maps.Map(document.getElementById("googleMap"),mapOptions);
var marker = new google.maps.Marker({
position: myCenter,
});
marker.setMap(map);
}
And:
<script src="https://maps.googleapis.com/maps/api/js?key=[insertkeyhere]"
type="text/javascript"></script>

Answer 1

You need to call the myMap function somewhere. Either call it onload:
google.maps.event.addDomListener(window,'load',myMap);
Or in the call back of the API load:
<script async defer src="https://maps.googleapis.com/maps/api/js?callback=myMap&key=[insertkeyhere]" type="text/javascript"></script>
(but not both)
proof of concept fiddle
code snippet:
function myMap() {
myCenter = new google.maps.LatLng(38.9869, 76.9426);
var mapOptions = {
center: myCenter,
zoom: 12,
scrollwheel: false,
draggable: false,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"), mapOptions);
var marker = new google.maps.Marker({
position: myCenter,
});
marker.setMap(map);
}
google.maps.event.addDomListener(window, "load", myMap);
html,
body,
#googleMap {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="googleMap"></div>