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ES6 101 - Map

ES6 101 - Map
ES6 Map is the topic of today’s post which also is the 11th in the ES6 101 Series. Map is going to be fairly easy, so before jumping into it, if you want to look at other features we have covered so far, here is a quick list for your reference.Fat Arrow FunctionsLexical Declarations - LetLexical Declarations - ConstSpread OPeratorTemplate LiteralRest OperatorDefault parametersDestructuringFor…ofSetNow let’s see what Map has to offer. As opposed to Set (which by the way, I highly recommend reading), Map saves values as key-value pair. Let’s see for ourselves how this works!Example of ES6 Mapvar dummyMap = newMap(); dummyMap.set("1"); // Method is set as against add in ES6 Setconsole.log(dummyMap); // [["1",null]] dummyMap.set("1", "one"); console.log(dummyMap); // [["1","one"]] dummyMap.set("2", "two").set("3","three"); console.log(dummyMap); // [["1","one&…

Retriving co-ordinates...

         We have seen 2 Google Maps API v3 examples wherein we have retrieved the latitude-longitude co-ordinates of the point of click on the map. In the first example we have displayed the co-ordinates in the information window and in the second, we have displayed the co-ordinates in a form in the information window.

        Today we will create a code to retrieve the latitude longitude co-ordinates in a text box while simultaneously a marker appears on the map as well. So, here goes the code.

<html>
<head>
<title>
Google Maps API v3 - Adding marker on Click and retrieving the co-ordinates in a text box
</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var map;    //When using event as a parameter to a function declare map, strictly as a global variable
function initialize()
{
    var myLatlng = new google.maps.LatLng(28.635157,77.22496);
      map = new google.maps.Map(document.getElementById("map_canvas"),
    {
        zoom: 14,
        center: myLatlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    google.maps.event.addListener(map, 'click', function(event)
    {
        placeMarker(event.latLng);
    });
}
 
function placeMarker(location)
{
    var marker = new google.maps.Marker(
    {
        position: location,
        map: map
    });
    var coords= location.lat().toFixed(6) + ', ' + location.lng().toFixed(6);
    document.getElementById("points").value = coords;
}
</script>
</head>
<body onload="initialize()" onunload=GUnload()>
<div id="map_canvas" style="width: 500px; height: 300px"></div>
<div id="text_coords" style="position: absolute; top:60px; left:600px; width:360px; height:600px; text-align:left">
<input type="text" id="points">
</div>
</body>
</html>

          The output of the code will look as seen in the image below!


         If you have any doubts or queries or suggestions about the codes and posts on the blog please leave a comment here or feel free to drop me a mail!

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