Javascript Course

The code snippet presented in this page can be used to add a google map image in web page with the location of the visitor's internet connection, using the geolocation JavaScript object.


Script code

<h4>Example Google Map with Geolocation JavaScript</h4>
<p>Click on this button to show a map with geolocation of your internet connection.</p>

<button id="get_geoloc">Show Geolocation</button>
<div id="geoloc_resp"></div>
<script>
function showGeoLoc(){
 var geoloc_resp = document.getElementById('geoloc_resp'); //element to add geolocation response

 //if the browser not support geolocation, show message
 if(!navigator.geolocation){
 geoloc_resp.innerHTML ='Geolocation is not supported by your browser';
 return;
 }

 geoloc_resp.innerHTML ='LOADING...';

 //get latitude and longitude position
 navigator.geolocation.getCurrentPosition(function(position){
 var latt = position.coords.latitude;
 var long = position.coords.longitude;
 var img_size = {w:400, h:350}; //image size

 //add in #geoloc_resp google map image with location
 geoloc_resp.innerHTML ='Latitude is: '+ latt +'<br>Longitude is: '+ long +'<br><img src="https://maps.googleapis.com/maps/api/staticmap?center='+ latt +','+ long +'&zoom=14&size='+ img_size.w +'x'+ img_size.h +'&markers=color:red|size:mid|'+ latt +','+ long +'" alt="Google map location" width=""'+ img_size.w +'" height="'+ img_size.h +'" />';
 }, function(err){
 //in case or error, show error message and its code
 geoloc_resp.innerHTML ='Unable to retrieve your location.<br>Error code: '+ err.code +'<br>Error message: '+ err.message;
 });
}

//register click event to button to call showGeoLoc() function
var get_geoloc = document.getElementById('get_geoloc');
if(get_geoloc) get_geoloc.addEventListener('click', showGeoLoc);
</script>

Demo

Click on this button to show a map with geolocation of your internet connection.

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag defines the clickable areas inside the image map?
<map> <img> <area>
<img src="image.jpg" usemap="#map1">
<map name="map1">
  <area shape="rect" coords="9, 120, 56, 149" href="#">
  <area shape="rect" coords="100, 200, 156, 249" href="#">
</map>
Which CSS property defines what is done if the content in a box is too big for its defined space?
display overflow position
#id {
  overflow: auto;
}
Click on the event which is triggered when the mouse is positioned over an object.
onclick onmouseover onmouseout
document.getElementById("id").onmouseover = function(){
  document.write("Have Good Life");
}
Indicate the PHP variable that contains data added in URL address after the "?" character.
$_SESSION $_GET $_POST
if(isset($_GET["id"])) {
  echo $_GET["id"];
}
Show Google Map image with Geolocation JavaScript object

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