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HERE Maps API - Create map markers from XML data

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[[Category:Ovi]][[Category:Web]][[Category:Browser]]
+
[[Category:Nokia Maps]][[Category:Code Examples]][[Category:JavaScript]][[Category:XML]]
''Delete instructional text in italic''
+
{{Abstract|This article explains how to read a structured XML file and create map markers based on the data.}}
  
{{Abstract|This article explains how to read a structured XML file and create map markers based on the data }}  
+
{{ArticleMetaData
 +
|sourcecode=  [[Media:Markersxml.zip|Markersxml.zip]]
 +
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 +
|devices=Internet Explorer, Firefox, Opera, Google Chrome
 +
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
 +
|platform= Web browser
 +
|devicecompatability= <!-- Compatible devices e.g.: All* (must have internal GPS) -->
 +
|dependencies=Nokia Maps 2.2.3
 +
|signing=<!-- Signing requirements - empty or one of: Self-Signed, DevCert, Manufacturer -->
 +
|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
 +
|keywords= Nokia Maps, jQuery, JavaScript, XML, KML
 +
|id= <!-- Article Id (Knowledge base articles only) -->
 +
|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
 +
|translated-by= <!-- [[User:XXXX]] -->
 +
|translated-from-title= <!-- Title only -->
 +
|translated-from-id= <!-- Id of translated revision -->
 +
|review-by=<!-- After re-review: [[User:username]] -->
 +
|review-timestamp= <!-- After re-review: YYYYMMDD -->
 +
|update-by=[[User:jasfox]]
 +
|update-timestamp=20111231
 +
|creationdate=20110627
 +
|author=[[User:Maveric]]
 +
}}
 +
{{SeeAlso|
 +
* [http://developer.here.net/javascript_api Nokia Maps API] 
 +
* [http://developer.here.net/apiexplorer/examples/api-for-js/markers/marker.html Adding a Marker]
 +
* [http://developer.here.net/apiexplorer/examples/api-for-js/data-visualization/map-with-interactive-kml-objects.html Loading a KML file example]
 +
* [[Nokia Maps API - How to display KML file data on the map]]
 +
* [[Reading XML Map Marker data with the Maps API for Java ME]]
 +
}}
  
 
== Introduction ==
 
== 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
+
Sometimes it is useful to have the data for a map, e.g. markers, in a separate file. This article provides an example which you can use to generate map content from an XML file. The example uses '''JavaScript''' and '''jQuery''', and processes an XML data file of the following format:
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.  
+
<code xml>
 +
<?xml version="1.0"?>
 +
    <markers>
 +
        <marker>
 +
            <name>M1</name>
 +
            <address>ADDRESS 1</address>
 +
            <lat>52.516617</lat>
 +
            <lng>13.377675</lng>
 +
      </marker>
 +
...etc
 +
</code>
  
 
== Prerequisites ==
 
== Prerequisites ==
  
Ovi Maps API supported web browser (basically any modern web browser).
+
* Nokia Maps API supported web browser (basically any modern web browser).
 
+
* '''jQuery''' downloaded and installed.  
JQuery downloaded and installed.  
+
* Change the directory names for your own version of the example, if needed.
 
+
Change the directory names for your own version of the example, if needed.
+
 
+
 
+
  
 
== Example code ==
 
== Example code ==
  
<code java>
+
Note that the example code - [[Media:Markersxml.zip|Markersxml.zip]] - leaves you room to implement your own {{Icode|InfoBubbles}}, and some other functionality (for e.g. the behaviour of the map and availability of components) is there if you need it, otherwise you can remove it. 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>Ovi Maps API example - Multiple markers created from XML data</title>
+
</head>
+
<p>
+
<body onLoad="init();">
+
<p style="text-align: center;">- OVI 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 src="http://api.maps.ovi.com/jsl.js" type="text/javascript" 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;
+
=== Header ===
var mapContainer;
+
Both the Nokia Maps API for JavaScript and the jQuery library need to be referenced in the header.
var container;
+
<code javascript>
var myMap;
+
<script type="text/javascript" src="http://api.maps.nokia.com/2.2.3/jsl.js" charset="utf-8"></script>
var bubbles=new Array();
+
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
 
+
</code>
// When the HTML page body section is loaded this function will be called.
+
  
 +
=== Body ===
 +
The Map is set up in {{Icode|init()}} the usual manner.
 +
<code javascript>
 
function init(){
 
function init(){
  
// Here we create an Ovi Maps within a Container.
+
// Here we create an instance of Nokia Maps within a Container.  
 
+
 
mapContainer = document.getElementById("map");
 
mapContainer = document.getElementById("map");
 
+
myInfoBubbles = new nokia.maps.map.component.InfoBubbles();
myInfoBubbles = new ovi.mapsapi.map.component.InfoBubbles();
+
 
+
myMap = nokia.maps.map,     
myMap = ovi.mapsapi.map,     
+
 
                 map = new myMap.Display(mapContainer, {
 
                 map = new myMap.Display(mapContainer, {
 
                     center: [52.59, 13.3], zoomLevel: 10,
 
                     center: [52.59, 13.3], zoomLevel: 10,
 
                     components: [ new myMap.component.Behavior(),
 
                     components: [ new myMap.component.Behavior(),
                                   new ovi.mapsapi.map.component.ZoomBar(),
+
                                   new nokia.maps.map.component.ZoomBar(),
                                   new ovi.mapsapi.map.component.Overview(),                             
+
                                   new nokia.maps.map.component.Overview(),                             
                                   new ovi.mapsapi.map.component.TypeSelector(),     
+
                                   new nokia.maps.map.component.TypeSelector(),     
                                   new ovi.mapsapi.map.component.ScaleBar(),
+
                                   new nokia.maps.map.component.ScaleBar(),
 
                   myInfoBubbles ]
 
                   myInfoBubbles ]
 
                 });
 
                 });
 
+
container = new ovi.mapsapi.map.Container();
+
 
+
 
// Define the XML filename to read that contains the marker data
 
// Define the XML filename to read that contains the marker data
placeMarkersOnMaps('uploads/markers.xml');
+
placeMarkersOnMaps('markers.xml');  
 +
}</code>
  
}
+
When the HTML page body section is loaded the  {{Icode|placeMarkersOnMaps()}} method will be called.
 +
This function gets passed the marker XML data file name. The location of the XML file is relative to the URL of the HTML page.
 +
{{Note|'''Both''' files must be hosted on a server for this function to work. The {{Icode|err}} method will fire if the file cannot be accessed. }}
  
// This function gets passed the marker XML data file name
+
<code javascript>
 
function placeMarkersOnMaps(filename)  
 
function placeMarkersOnMaps(filename)  
 
{
 
{
 
var counter = 0;
 
var counter = 0;
    $.get(filename, function(xml){
+
$.ajax({
              $(xml).find("marker").each(function()
+
    type: "GET",
        {
+
    url: filename ,
        //Read the name, address, latitude and longitude for each Marker
+
    dataType: "xml",
            var name = $(this).find('name').text();
+
    success: parseXml,
            var address = $(this).find('address').text();
+
              error : err
            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 ovi.mapsapi.geo.Coordinate(parseFloat(lat), parseFloat(lng));  
+
}
 
+
function err (){
            marker = new ovi.mapsapi.map.StandardMarker(markerCoords,
+
alert("An Error has occurred.");
 +
}
 +
</code>
  
            {text:name, brush:"#FF69B4", pen:"#09F911", textPen:"#00009C", shape: "star"});
+
The {{Icode|parseXml()}} function is the meat of the example. It uses standard '''jQuery''' parsing to retrieve the elements from the XML file.
                     
+
<code javascript>
              container.objects.add(marker);    
+
function parseXml(xml)
 
+
{
              // Used for testing:
+
var container = new nokia.maps.map.Container();
              // myInfoBubbles.addBubble(name, markerCoords);
+
$(xml).find("marker").each(function(){
              // counter ++ 1;
+
              // alert(counter);
+
//Read the name, address, latitude and longitude for each Marker
 +
var nme = $(this).find('name').text();
 +
var address = $(this).find('address').text();
 +
var lat = $(this).find('lat').text();
 +
var lng = $(this).find('lng').text();
 +
 +
//Put each marker on the map as the data has been read.
 +
 +
var markerCoords = new nokia.maps.geo.Coordinate(parseFloat(lat), parseFloat(lng));   
 +
 +
var marker = new nokia.maps.map.StandardMarker(markerCoords, {text:nme});
 +
container.objects.add(marker);    
 +
 +
});
 +
// Add the marker container .
 +
map.objects.add(container);
 +
// Zoom into the markers.
 
   
 
   
    });
 
 
// 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.");
 
alert("Markers have been loaded. Hit OK to zoom the map into the area covering the markers.");
 
+
 
map.zoomTo(container.getBoundingBox(), false);
 
map.zoomTo(container.getBoundingBox(), false);
  
Line 122: Line 144:
 
</code>
 
</code>
  
 
+
=== Example XML file ===
== Example XML file ==
+
The file to be parsed is in the following format - the full XML file can be found  in  [[Media:Markersxml.zip]]
<code java>
+
<code xml>
 
+
 
<?xml version="1.0"?>
 
<?xml version="1.0"?>
 +
    <markers>
 +
        <marker>
 +
            <name>M1</name>
 +
            <address>ADDRESS 1</address>
 +
            <lat>52.516617</lat>
 +
            <lng>13.377675</lng>
 +
        </marker>
  
<markers>
+
        .... etc
<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>
 
</markers>
 
 
</code>
 
</code>
  
 
== Summary ==
 
== Summary ==
 +
The following screenshot shows how the XML has been parsed
 +
 +
[[File:MarkersXMLexample.png]]
  
 
Edit the script and file for your own purposes, hope you find this article useful.
 
Edit the script and file for your own purposes, hope you find this article useful.
  
== Tested with ==
+
== Alternative  Solution ==
 +
Since the latest version of the Nokia Maps API is able to natively render KML files, it would make sense to transform the XML into KML using XSLT. You can copy the ''markers.xml'' file from  [[Media:Markersxml.zip]]
 +
into an [http://www.w3schools.com/xsl/tryxslt.asp?xmlfile=cdcatalog&xsltfile=cdcatalog XSLT Editor] and use the the XSLT stylesheet described below.The KML can then be loaded directly onto a map
 +
using the code from the [http://developer.here.net/apiexplorer/examples/api-for-js/data-visualization/map-with-interactive-kml-objects.html Loading a KML file example] on the [http://developer.here.net/javascript_api_explorer API explorer]
  
Microsoft XP Pro and the following browsers:
+
<code xml>
 +
<?xml version="1.0" encoding="ISO-8859-1"?>
 +
<!-- Edited by XMLSpy® -->
 +
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
Opera 5.0.5 & Firefox 5.0
+
<xsl:template match="markers">
 +
  <Document>
 +
      <xsl:for-each select="marker">
 +
      <Placemark>
 +
        <name><xsl:value-of select="name"/></name>
 +
        <address><xsl:value-of select="address"/></address>
 +
        <coordinates>
 +
          <xsl:value-of select="lat"/>,<xsl:value-of select="lng"/>,0
 +
        </coordinates>
 +
      </Placemark>
 +
      </xsl:for-each>
 +
  </Document>
 +
</xsl:template>
 +
</xsl:stylesheet>
 +
 
 +
</code>
  
== See the example live here ==
+
==For more on the Nokia Maps API==
  
http://mapswidgets.com/markers.html
+
Please check out the Nokia Maps API full documentation and API reference here:
 +
* [http://developer.here.net/javascript_api Nokia Maps API]
  
== For more on Ovi Maps API ==
+
You may also access the interactive API explorer
Please go to http://api.maps.ovi.com
+
* [http://developer.here.net/javascript_api_explorer API explorer]

Revision as of 18:15, 3 January 2013

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

Article Metadata
Code Example
Source file: Markersxml.zip
Tested with
Devices(s): Internet Explorer, Firefox, Opera, Google Chrome
Compatibility
Platform(s): Web browser
Dependencies: Nokia Maps 2.2.3
Article
Keywords: Nokia Maps, jQuery, JavaScript, XML, KML
Created: Maveric (27 Jun 2011)
Updated: jasfox (31 Dec 2011)
Last edited: jasfox (03 Jan 2013)

Contents

Introduction

Sometimes it is useful to have the data for a map, e.g. markers, in a separate file. This article provides an example which you can use to generate map content from an XML file. The example uses JavaScript and jQuery, and processes an XML data file of the following format:

<?xml version="1.0"?>
<markers>
<marker>
<name>M1</name>
<address>ADDRESS 1</address>
<lat>52.516617</lat>
<lng>13.377675</lng>
</marker>
...etc

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 - Markersxml.zip - leaves you room to implement your own InfoBubbles, and some other functionality (for e.g. the behaviour of the map and availability of components) is there if you need it, otherwise you can remove it. Feel free to copy and modify for your own purposes!

Header

Both the Nokia Maps API for JavaScript and the jQuery library need to be referenced in the header.

<script type="text/javascript" src="http://api.maps.nokia.com/2.2.3/jsl.js" charset="utf-8"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

Body

The Map is set up in init() the usual manner.

function init(){
 
// Here we create an instance of 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 ]
});
 
// Define the XML filename to read that contains the marker data
placeMarkersOnMaps('markers.xml');
}

When the HTML page body section is loaded the placeMarkersOnMaps() method will be called. This function gets passed the marker XML data file name. The location of the XML file is relative to the URL of the HTML page.

Note.pngNote: Both files must be hosted on a server for this function to work. The err method will fire if the file cannot be accessed.

function placeMarkersOnMaps(filename) 
{
var counter = 0;
$.ajax({
type: "GET",
url: filename ,
dataType: "xml",
success: parseXml,
error : err
});
 
}
function err (){
alert("An Error has occurred.");
}

The parseXml() function is the meat of the example. It uses standard jQuery parsing to retrieve the elements from the XML file.

function parseXml(xml)
{
var container = new nokia.maps.map.Container();
$(xml).find("marker").each(function(){
 
//Read the name, address, latitude and longitude for each Marker
var nme = $(this).find('name').text();
var address = $(this).find('address').text();
var lat = $(this).find('lat').text();
var lng = $(this).find('lng').text();
 
//Put each marker on the map as the data has been read.
 
var markerCoords = new nokia.maps.geo.Coordinate(parseFloat(lat), parseFloat(lng));
 
var marker = new nokia.maps.map.StandardMarker(markerCoords, {text:nme});
container.objects.add(marker);
 
});
// 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

The file to be parsed is in the following format - the full XML file can be found in Media:Markersxml.zip

<?xml version="1.0"?>
<markers>
<marker>
<name>M1</name>
<address>ADDRESS 1</address>
<lat>52.516617</lat>
<lng>13.377675</lng>
</marker>
 
.... etc
</markers>

Summary

The following screenshot shows how the XML has been parsed

MarkersXMLexample.png

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

Alternative Solution

Since the latest version of the Nokia Maps API is able to natively render KML files, it would make sense to transform the XML into KML using XSLT. You can copy the markers.xml file from Media:Markersxml.zip into an XSLT Editor and use the the XSLT stylesheet described below.The KML can then be loaded directly onto a map using the code from the Loading a KML file example on the API explorer

<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- Edited by XMLSpy® -->
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 
<xsl:template match="markers">
<Document>
<xsl:for-each select="marker">
<Placemark>
<name><xsl:value-of select="name"/></name>
<address><xsl:value-of select="address"/></address>
<coordinates>
<xsl:value-of select="lat"/>,<xsl:value-of select="lng"/>,0
</coordinates>
</Placemark>
</xsl:for-each>
</Document>
</xsl:template>
</xsl:stylesheet>

For more on the Nokia Maps API

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

You may also access the interactive API explorer

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