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HERE Maps API - How to find the nearest Marker

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{{ArticleMetaData
 
{{ArticleMetaData
|sourcecode= [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]]  
+
|sourcecode= [[https://github.com/heremaps/examples/blob/master/JavaScript%20API/find-nearest-marker.html find-nearest-marker.html]]
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 
|devices= Firefox , Internet Explorer, Google Chrome, Opera
 
|devices= Firefox , Internet Explorer, Google Chrome, Opera
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}}
 
}}
 
{{SeeAlso|
 
{{SeeAlso|
* [http://developer.here.net/javascript_api HERE Maps API]
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* [http://developer.here.com/javascript_api HERE Maps API]
* [http://developer.here.net/apiexplorer/examples/api-for-js/markers/marker.html Adding a Marker]}}
+
* [http://developer.here.com/apiexplorer/examples/api-for-js/markers/marker.html Adding a Marker]}}
  
 
== Introduction ==
 
== Introduction ==
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After setting up five markers, the code continues by adding a {{Icode|click}} event to the map.
 
After setting up five markers, the code continues by adding a {{Icode|click}} event to the map.
 
<code javascript>
 
<code javascript>
var eventTarget = nokia.maps.dom.EventTarget;       
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function addClickEventListenerToMap(map){
var eventCheck = document.getElementById("map");               
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map.addListener("click", function(evt){
eventTarget(eventCheck);       
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var coords = map.pixelToGeo(evt.targetX , evt.targetY);
eventCheck.addListener("click", function(evt)        
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findNearestMarker (coords);
  {    var coords = map.pixelToGeo(evt.targetX , evt.targetY);          
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}, false);
        findNearestMarker (coords);      
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}       
    }, false);          
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</code>
 
</code>
 
The {{Icode|findNearestMarker()}} method iterates through each {{Icode|marker}} on the map and calculates the distance. The lowest distance so far is kept.
 
The {{Icode|findNearestMarker()}} method iterates through each {{Icode|marker}} on the map and calculates the distance. The lowest distance so far is kept.
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</code>
 
</code>
  
The fully coded example can be found here : [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]]
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The fully working example can be found at:
 +
 
 +
http://htmlpreview.github.io/?https://github.com/heremaps/examples/blob/master/JavaScript%20API/find-nearest-marker.html

Revision as of 11:17, 15 August 2013

This code example shows how to find the nearest Marker from any point on the map. The code is useful for finding the Markers that are located close to the user's current position or destination.

Article Metadata
Code ExampleTested with
Devices(s): Firefox , Internet Explorer, Google Chrome, Opera
Compatibility
Platform(s): Web Browser
Dependencies: HERE Maps API 2.2.3
Article
Keywords: HERE Maps, JavaScript, Marker
Created: Maveric (13 Nov 2011)
Last edited: jasfox (15 Aug 2013)

Introduction

This example demonstrates how to find the nearest map Marker from any point on the map. In the example there are five Markers on the Nokia Map and you can click anywhere on the map. Based on where you clicked, the script will calculate the distance to the Marker that is located closest to the point of your click. To display the result, the label text of the Marker is retrieved and shown on the page.

NearestMarkerExample..png

Example code

After setting up five markers, the code continues by adding a click event to the map.

function addClickEventListenerToMap(map){
map.addListener("click", function(evt){
var coords = map.pixelToGeo(evt.targetX , evt.targetY);
findNearestMarker (coords);
}, false);
}

The findNearestMarker() method iterates through each marker on the map and calculates the distance. The lowest distance so far is kept.

function findNearestMarker(coords) { 
var minDist = 1000;
var nearest_text = "*None*";
for (i=0; i< map.objects.getLength(); i++)
{
if ( map.objects.get(i) instanceof nokia.maps.map.StandardMarker ) {
var markerDist = map.objects.get(i).coordinate.distance(coords);
if (markerDist < minDist) {
minDist = markerDist;
nearest_text = map.objects.get(i).text
}
}
}
 
alert (nearest_text);
}

The fully working example can be found at:

http://htmlpreview.github.io/?https://github.com/heremaps/examples/blob/master/JavaScript%20API/find-nearest-marker.html

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