在Google Earth API KML文件中搜索String Value placemarker？

Question

Trying to create search box for Google Earth API Plugin for javascript I am able to parse KMLFile and load in GE API and now I have to embed search by Placemarker name loaded by KML.

Code using Lat & Long

var lookAt = ge.createLookAt('');
lookAt.set(point.y, point.x, 600, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 00, 0);
ge.getView().setAbstractView(lookAt);

Is there any possibility for LookAt using Placemarker Name (string value) instead searching of using LAT, LONG?

Answer 1

Yes there are a few ways to do this depending on your set-up.

One general way would be to give each placemark a unique ID, then use that ID to look at it.

For example, imagine you have the following kml placemark and that you have loaded into the api from the url http://localhost/foo.kml

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Placemark id="myPlacemark">
    <name>Myplacemark</name>
    <Point>
      <coordinates>-122.0822035425683,37.42228990140251,0</coordinates>
    </Point>
  </Placemark>
</kml>

You could then 'look at' the placemark myPlacemark like so.

var placemark = ge.getElementByUrl('http://localhost/foo.kml#myPlacemark');
var point = placemark.getGeometry();
var lookAt = ge.createLookAt('');
lookAt.set(point.getLatitude(), point.getLongitude(), 600, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 00, 0);
ge.getView().setAbstractView(lookAt);

A simple function could be made so you can simply pass the correct ID in to look at any point placemark loaded from KML that has an ID.

var myLookAt = function(id) {
  var placemark = ge.getElementByUrl(id);
  if('getGeometry' in placemark && 
    placemark.getGeometry().getType() == 'KmlPoint') {
    var point = placemark.getGeometry();
    var lookAt = ge.createLookAt('');
    lookAt.set(point.getLatitude(), point.getLongitude(), 600, ge.ALTITUDE_RELATIVE_TO_GROUND, 0, 00, 0);
    ge.getView().setAbstractView(lookAt);
  }
};

// useage
myLookAt('http://localhost/foo.kml#myPlacemark');

You could obviously alter the myLookAt function to look for lookAt and camera elements, or to handle other types of objects as well - such as multi geometries, etc.