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Revision as of 18:25, 31 December 2011 by rahulvala (Talk | contribs)

HERE Maps API - Create map markers from XML data

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This article explains how to read a structured XML file and create map markers based on the data.

Article Metadata
Compatibility
Platform(s): Web browser
Article
Created: ()
Updated: avnee.nathani (31 Dec 2011)
Last edited: rahulvala (31 Dec 2011)

Contents

Introduction

Sometimes it would be useful to have the data for map, e.g. for markers, to reside on a separate file. In this article, an example is presented, using which you can yourself utilize a separate XML file for creating map content. The example will use Javascript and jQuery.

Prerequisites

  • Nokia Maps API supported web browser (basically any modern web browser).
  • JQuery downloaded and installed.
  • Change the directory names for your own version of the example, if needed.

Example code

Note that the example code leaves you room to implement your own infoBubbles and some other functionality is there if you need it, otherwise you can remove it; for e.g. the behaviour of the map and availability of components. Feel free to copy and modify for your own purposes!

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<head>
<title>Nokia Maps API example - Multiple markers created from XML data</title>
</head>
<p>
<body onLoad="init();">
<p style="text-align: center;">- Nokia MAPS API EXAMPLE -</p>
<p style="text-align: center;">READ DATA OF MULTIPLE MARKERS FROM XML FILE AND PUT THE MARKERS ON THE MAP</p>
<center>
<div id="map" style="width:600px; height:400px; position: relative"></div>
</center>
<p>
<script type="text/javascript"
src="http://api.maps.nokia.com/2.0.0/jsl.js" charset="utf-8">
</script>
<script type="text/javascript" src="js/jquery-1.4.1.min.js"></script>
<script type="text/javascript" src="js/markers.js"></script>
</p>
<p>&nbsp;</p>
</body>
</html>
 
var markerCoords;
var mapContainer;
var container;
var myMap;
var bubbles=new Array();
 
// When the HTML page body section is loaded this function will be called.
 
function init(){
 
// Here we create an Nokia Maps within a Container.
 
mapContainer = document.getElementById("map");
 
myInfoBubbles = new nokia.maps.map.component.InfoBubbles();
 
myMap = nokia.maps.map,
map = new myMap.Display(mapContainer, {
center: [52.59, 13.3], zoomLevel: 10,
components: [ new myMap.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(),
myInfoBubbles ]
});
 
container = new nokia.maps.map.Container();
 
// Define the XML filename to read that contains the marker data
placeMarkersOnMaps('uploads/markers.xml');
 
}
 
// This function gets passed the marker XML data file name
function placeMarkersOnMaps(filename)
{
var counter = 0;
$.get(filename, function(xml){
$(xml).find("marker").each(function()
{
//Read the name, address, latitude and longitude for each Marker
var name = $(this).find('name').text();
var address = $(this).find('address').text();
var lat = $(this).find('lat').text();
var lng = $(this).find('lng').text();
//Used for testing:
//alert("Name:"+name+" Address:"+address+" Lat:"+lat+" Lon:"+lng);
//Put each marker on the map as the data has been read.
 
markerCoords = new nokia.maps.geo.Coordinate(parseFloat(lat), parseFloat(lng));
 
marker = new nokia.maps.map.StandardMarker(markerCoords,
 
{text:name, brush:"#FF69B4", pen:"#09F911", textPen:"#00009C", shape: "star"});
 
container.objects.add(marker);
 
// Used for testing:
// myInfoBubbles.addBubble(name, markerCoords);
// counter ++ 1;
// alert(counter);
 
});
 
// Add the marker container .
 
map.objects.add(container);
 
});
// Zoom into the markers.
 
alert("Markers have been loaded. Hit OK to zoom the map into the area covering the markers.");
 
map.zoomTo(container.getBoundingBox(), false);
 
}

Example XML file

<?xml version="1.0"?>
 
<markers>
<marker>
<name>M1</name>
<address>ADDRESS 1</address>
<lat>52.516617</lat>
<lng>13.377675</lng>
</marker>
 
<marker>
<name>M2</name>
<address>ADDRESS 2</address>
<lat>52.525286</lat>
<lng>13.369499</lng>
</marker>
 
<marker>
<name>M3</name>
<address>ADDRESS 3</address>
<lat>52.518506</lat>
<lng>13.375082</lng>
</marker>
 
<marker>
<name>M4</name>
<address>ADDRESS 4</address>
<lat>52.52446</lat>
<lng>13.381562</lng>
</marker>
 
<marker>
<name>M5</name>
<address>ADDRESS 5</address>
<lat>52.523572</lat>
<lng>13.378451</lng>
</marker>
 
<marker>
<name>M6</name>
<address>ADDRESS 6</address>
<lat>52.530386</lat>
<lng>13.385189</lng>
</marker>
 
<marker>
<name>M7</name>
<address>ADDRESS 7</address>
<lat>52.518545</lat>
<lng>13.363709</lng>
</marker>
 
<marker>
<name>M8</name>
<address>ADDRESS 8</address>
<lat>52.515738</lat>
<lng>13.378515</lng>
</marker>
 
</markers>

Summary

Edit the script and file for your own purposes, hope you find this article useful.

Tested with

Microsoft XP Pro and the following browsers:

  • Opera 5.0.5 & Firefox 5.0

For more on Nokia Maps API

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

You may also access the interactive Nokia Maps API playground,

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