HERE Maps API - How to find the nearest Marker
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|sourcecode= [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]] | |sourcecode= [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]] | ||
|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 | + | |devices= Firefox , Internet Explorer, Google Chrome, Opera |
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) --> | |sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) --> | ||
|platform= Web Browser | |platform= Web Browser | ||
|devicecompatability= <!-- Compatible devices e.g.: All* (must have internal GPS) --> | |devicecompatability= <!-- Compatible devices e.g.: All* (must have internal GPS) --> | ||
| − | |dependencies= | + | |dependencies= Nokia Maps API 2.2 |
|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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| − | The fully coded example can be found here : [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]] | + | The fully coded example can be found here : [[Media:NearestMarkerExample.zip|NearestMarkerExample.zip]] |
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Revision as of 15:56, 13 April 2012
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 Example
Tested with
Compatibility
Article
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 Nokia Maps 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.
Example code
After setting up five markers, the code continues by adding a click event to the map.
var eventTarget = nokia.maps.dom.EventTarget;
var eventCheck = document.getElementById("map");
eventTarget(eventCheck);
eventCheck.addListener("click", function(evt)
{ var coords = map.pixelToGeo(evt.targetX , evt.targetY);
findNearestMarker (coords);
}, false);
The findNearestMarker function 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 coded example can be found here : NearestMarkerExample.zip
