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Revision as of 19:14, 24 April 2013 by jasfox (Talk | contribs)

HERE Maps API - Map UI components

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This article shows how to use a static Nokia map and add interactive UI controls to it.

Tip.pngTip: The HERE Maps API for JavaScript is generally used to display an interactive map on screen. i.e. a map which is pannable, zoomable or clickable for further information. If you don't need any UI components, a simpler solution for displaying a non-interactive static map would be to use the RESTful Map API where the location of the map is encoded into the URL of the image. For example, the following URL will display a static map without using any JavaScript:

<img id="gmapcanvas" src="http://m.nok.it/?c=0,0&w=600&z=1&nord&nodot" 
alt="Hello World" />

Article Metadata
Tested with
Devices(s): Internet Explorer, Google Chrome, Firefox, Opera
Compatibility
Platform(s): Web
Dependencies: HERE Maps 2.2.4
Article
Keywords: HERE Maps, JavaScript, UI, components
Created: Maveric (21 Jun 2011)
Last edited: jasfox (24 Apr 2013)


Contents

Introduction

In this article we will make a static map interactive by adding some UI control components. By default, when the map is initiated without parameters or components, it will set the coordinates to 0,0 and zoom level to zero (0). We would be adding controls like zoom bar, scale bar and map type selector.

Prerequisites

HERE Maps API supported device and browser (basically any modern browser)

Implementation

To make the map 'intelligent', to be able to zoom it and move within the map, we need to add some components to it.

ZoomBar This will add a slider UI component, which enables the user to increase or decrease the map zoom level. The four zoom level bookmark buttons that also will appear, allow for setting predefined zoom levels.

Overview Defines a panel showing an overview of the map of the currently visible viewport.

TypeSelector Provides a user interface to change the current base map type (Satellite, Terrain, Map)

ScaleBar Defines a panel providing a scalebar. The scalebar is a ruler displaying distance measurements at different zoom levels of the map. By default, the scalebar is collapsed showing only one ruler section. When expanded, the scalebar shows more ruler sections. The measurement type can be changed from metric to imperial, which will be reflected in the distance measurements.


Example Static non-interactive map example code

The code below would show us a map which has no presets defined, so it will default to the map origin 0,0 and zoom level minimum (0) with no possibility for the user to interact with the map: it does not respond to the user mouse click and all the UI components are removed (Zoom Bar, Scale Bar, Map Type Selector).

Note.pngNote: As from HERE Maps API 2.2 The authorization token is now required

<!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>Static map</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript"
src="http://api.maps.nokia.com/2.2.4/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");
 
//
/////////////////////////////////////////////////////////////////////////////////////
var map = new nokia.maps.map.Display(document.getElementById("mapContainer"));
</script>
</body>
</html>

Example: Dynamic, interactive map with a predefined zoom level, map center point and map type

The example code contains HTML code and embedded JavaScript.

<!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>Dynamic, interactive map</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript"
src="http://api.maps.nokia.com/2.2.4/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");
 
//
/////////////////////////////////////////////////////////////////////////////////////
var map = new nokia.maps.map.Display(document.getElementById("mapContainer"), {
components: [
new nokia.maps.map.component.Behavior(),
new nokia.maps.map.component.ZoomBar(),
new nokia.maps.map.component.Overview(),
new nokia.maps.map.component.TypeSelector(),
new nokia.maps.map.component.ScaleBar() ],
zoomLevel: 8,
center: [19.119, 72.8957]
});
 
</script>
</body>
</html>

For more on the HERE Maps API

Please check out the HERE Maps API full documentation and API reference here:

You may also access the interactive API explorer

Tested on

  • Google Chrome 20.0x
  • Mozilla Firefox 13.0x
214 page views in the last 30 days.
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