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Revision as of 17:20, 13 November 2011 by Maveric (Talk | contribs)

HERE Maps API - How to find the nearest Marker

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This article explains how to find the nearest Marker on the map.

Introduction

This example will demonstrate 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.

Summary

This method is useful when you need to determine what is located close to e.g. the user's current position, e.g. that of a walking distance.

Example code

<html>
<head>
<title>Nokia Maps API - Find the nearest Marker example</title>
<script type="text/javascript" charset="UTF-8" src="http://api.maps.nokia.com/2.0.0/jsl.js"></script>
</head>
<body>
<center><div id="map" style="z-index: -1; left:1px; top:100px; width:640px; height:480px;></div></center>
<div style="
z-index: -1; left:40px; top:450px; width: 800px; position: absolute;">
<p>Click anywhere on the Map to find out which of the five Markers is the nearest to that spot.</p>
<p>You can also drag and drop any Marker to a new position.
<p>The nearest marker is: <span id="
nearestMarker">*None*</span><br></div>
<script type="
text/javascript">
 
var nearestMarker = document.getElementById("
nearestMarker");
 
var map = new nokia.maps.map.Display(document.getElementById("
map"),
{components: [ new nokia.maps.map.component.Behavior() ]});
 
map.setCenter([60.1697768639186, 24.82923586371288]);
map.setZoomLevel(16);
map.set("
baseMapType", map.SATELLITE);
 
var marker1 = new nokia.maps.map.StandardMarker([60.1697768639186, 24.82923586371288],
{
text: "
Marker 1",
draggable: true,
});
var marker2 = new nokia.maps.map.StandardMarker([60.170497332447866, 24.828592133548653 ],
{
text: "
Marker 2",
draggable: true,
});
var marker3 = new nokia.maps.map.StandardMarker([60.17093227431904, 24.827707004572943 ],
{
text: "
Marker 3",
draggable: true,
});
 
var marker4 = new nokia.maps.map.StandardMarker([60.170057048001865, 24.826505374933163 ],
{
text: "
Marker 4",
draggable: true,
});
 
var marker5 = new nokia.maps.map.StandardMarker([60.170025027084705, 24.82839365008141],
{
text: "
Marker 5",
draggable: true,
});
 
map.objects.add(marker1);
map.objects.add(marker2);
map.objects.add(marker3);
map.objects.add(marker4);
map.objects.add(marker5);
 
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);
 
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
}
}
}
 
nearestMarker.innerHTML = nearest_text;
}
</script>
</body>
</html>
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