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Change Marker based on zoom level in HERE Maps

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|platform= Web
 
|platform= Web
 
|devicecompatability= <!-- Compatible devices e.g.: All* (must have internal GPS) -->
 
|devicecompatability= <!-- Compatible devices e.g.: All* (must have internal GPS) -->
|dependencies=Nokia Maps 2.2.1
+
|dependencies=Nokia Maps 2.2.3
 
|signing=<!-- Signing requirements - empty or one of: Self-Signed, DevCert, Manufacturer -->
 
|signing=<!-- Signing requirements - empty or one of: Self-Signed, DevCert, Manufacturer -->
 
|capabilities=<!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
 
|capabilities=<!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
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{{SeeAlso|
 
{{SeeAlso|
*   [http://api.maps.nokia.com/en/maps/intro.html Nokia Maps API]  
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* [http://developer.here.net/javascript_api Nokia Maps API]
* [http://api.maps.nokia.com/en/playground/examples/maps/map_essentials/zooming.html Zooming the Map]
+
* [http://developer.here.net/apiexplorer/examples/api-for-js/map/zooming-the-map.html Zooming the Map]
* [http://api.maps.nokia.com/en/playground/examples/maps/observability/dualdisplays.html Observing Map Properties]
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* [http://developer.here.net/apiexplorer/examples/api-for-js/events/map-observe-to-control-2nd-map.html Observing Map Properties]
 
  }}
 
  }}
  
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       <title>Changing Marker on Zoom</title>
 
       <title>Changing Marker on Zoom</title>
 
       <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 
       <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
       <script type="text/javascript" src="http://api.maps.nokia.com/2.2.1/jsl.js" charset="utf-8"></script>
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       <script type="text/javascript" src="http://api.maps.nokia.com/2.2.3/jsl.js" charset="utf-8"></script>
 
     </head>
 
     </head>
 
     <body>
 
     <body>

Revision as of 18:18, 3 January 2013

This article shows how to control the display of map markers based on zoom level. This can be useful both to ensure that markers are not distorted as the map level changes, or indeed to ensure that those displayed are still relevant.

Article Metadata
Code Example
Source file: marker.html
Tested with
Devices(s): Internet Explorer, Firefox, Google Chrome, Opera
Compatibility
Platform(s): Web
Dependencies: Nokia Maps 2.2.3
Article
Keywords: Nokia Maps, JavaScript, Zoom, markers
Created: jackdenial (30 Dec 2011)
Last edited: jasfox (03 Jan 2013)


Adding map observer

In this code snippet, we are adding zoomLevel property of the map to monitor the zoom and we will change the marker accordingly.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Changing Marker on Zoom</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="http://api.maps.nokia.com/2.2.3/jsl.js" charset="utf-8"></script>
</head>
<body>
 
<div id="mapContainer" style="z-index: -1; left:0px; top:0px; width: 100%; height: 80%; position: absolute;"></div>
<script type="text/javascript">
/////////////////////////////////////////////////////////////////////////////////////
// Don't forget to set your API credentials
//
// Replace with your appId and token which you can obtain when you
// register on http://api.developer.nokia.com/
//
nokia.Settings.set( "appId", "YOUR APP ID GOES HERE");
nokia.Settings.set( "authenticationToken", "YOUR AUTHENTICATION TOKEN GOES HERE");
 
//
/////////////////////////////////////////////////////////////////////////////////////
 
// Get the DOM node to which we will append the map
var mapContainer = document.getElementById("mapContainer");
var map = new nokia.maps.map.Display(mapContainer, {
// Initial center and zoom level of the map
center: [52.51, 13.4],
zoomLevel: 3,
components: [
// ZoomBar provides an UI to zoom the map in & out
new nokia.maps.map.component.ZoomBar(),
// We add the behavior component to allow panning / zooming of the map
new nokia.maps.map.component.Behavior(),
// Creates UI to easily switch between street map satellite and terrain mapview modes
new nokia.maps.map.component.TypeSelector()
]
});
 
var la=52.51;
var lo=13.4;
var standardMarker = new nokia.maps.map.StandardMarker(new nokia.maps.geo.Coordinate(parseFloat(la), parseFloat(lo)));
var standardMarkerProps =
{
text: "42",
brush: {
color: "#F80"
}
};
 
map.objects.add(standardMarker);
 
var arrColor = ["#0C0101","#220202","#320303","#410505","#520707","#640909","#7A0C0C","#910F0F",
"#AB0E0E","#D21313","#FC1111","#9DA008","#F4F80E","#0EF82A","#6ADB78","#0C0101","#220202",
"#320303","#410505","#520707","#640909","#AB0E0E","#D21313","#FC1111","#9DA008"];
 
map.addObserver("zoomLevel",function(){
map.objects.clear();
standardMarkerProps.text = map.zoomLevel;
standardMarkerProps.brush.color = arrColor[map.zoomLevel];
map.objects.add(new nokia.maps.map.StandardMarker(
new nokia.maps.geo.Coordinate(parseFloat(la), parseFloat(lo)),
standardMarkerProps
));
});
 
</script>
</body>
</html>

Output

The output of the above code would look like the screenshot below. Whenever you double click the map, it will zoom in, and the marker will show zoomLevel in the balloon and its color will also get changed accordingly.

ZoomLevel.jpg

Demo

  • Double click to zoom-in
  • Double right-click to zoom-out
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