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Google Earth plugin

Posted on 2010-09-22
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Last Modified: 2012-08-13
My Google Earth plugin shows multiple placemarks.  When the user clicks a button on the webpage, I want to change the color of a specific icon.  Code is below.  I've read enough of the GE documentation to know that it's possible.... but I am hoping that someone can give me an example.  Any help will be appreciated.
<html>
<head>
<title>TN_NVL Map</title>
  <script src="http://maps.google.com/jsapi?key=MyKeyXYZ"></script>
    <script type="text/javascript">
    var ge;
    google.load("earth", "1");
    function init() {google.earth.createInstance('map3d', initCallback, failureCallback);}
    function initCallback(instance) {
      ge = instance;
      ge.getWindow().setVisibility(true);
      ge.getNavigationControl().setVisibility(ge.VISIBILITY_AUTO);
      ge.getLayerRoot().enableLayerById(ge.LAYER_BORDERS, true);
      ge.getLayerRoot().enableLayerById(ge.LAYER_ROADS, true);
      var placemark = ge.createPlacemark('0003');
      placemark.setName('0003');
      var icon = ge.createIcon('');
      icon.setHref('http://maps.google.com/mapfiles/kml/paddle/ltblu-diamond.png');
      var style = ge.createStyle(''); //create a new style
      style.getIconStyle().setIcon(icon); //apply the icon to the style
      placemark.setStyleSelector(style); //apply the style to the placemark
      var point = ge.createPoint('');
      point.setLatitude(35.833225);
      point.setLongitude(-86.394501);
      placemark.setGeometry(point);
      ge.getFeatures().appendChild(placemark);
      var placemark = ge.createPlacemark('0001');
      placemark.setName('0001');
      var icon = ge.createIcon('');
      icon.setHref('http://maps.google.com/mapfiles/kml/paddle/ltblu-diamond.png');
      var style = ge.createStyle(''); //create a new style
      style.getIconStyle().setIcon(icon); //apply the icon to the style
      placemark.setStyleSelector(style); //apply the style to the placemark
      var point = ge.createPoint('');
      point.setLatitude(35.835754);
      point.setLongitude(-86.351913);
      placemark.setGeometry(point);
      ge.getFeatures().appendChild(placemark);
   
      var la = ge.createLookAt('');
      la.set(35.835754, -86.351913,
        0,
        ge.ALTITUDE_RELATIVE_TO_GROUND,
        0,
        0,
        40000
        );
      ge.getView().setAbstractView(la);
    }
	function failureCallback(errorCode) {}    
	
    function ColorMeRed() {
    alert('Now What???');
	}

	
	
    </script>
</head>
<body onLoad="init()" style="border: 0; border-width: 0; padding: 0;">
<div id="map3d" style="height: 80%; width: 100%; border: 0; border-width: 0; padding: 0;"></div>
<button onclick="ColorMeRed()">
    Turn 0001 RED
</button>

</body></html>

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Question by:motokent
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4 Comments
 
LVL 4

Accepted Solution

by:
heppa earned 500 total points
ID: 33741682
Hey there!

first of all, you should edit your post or ask a Mod to remove your Google API Key.. It is meant for your personal use, and shouldn't be reused by anyone...

then, you should refactor your code to put redundant code into a seperate function

Code 1

and in init call

 makePlacemark('http://maps.google.com/mapfiles/kml/paddle/ltblu-diamond.png', 35.833225, -86.394501, '0003');
        makePlacemark('http://maps.google.com/mapfiles/kml/paddle/ltblu-diamond.png', 35.835754, -86.351913, '0001');

Makes your code easier to read AND faster to load!

For your problem I think you should do

function ColorMeRed() {
            var changePlacemark = ge.getElementById('0003');      
            // Define a custom icon.
            var icon = ge.createIcon('');
            icon.setHref('http://maps.google.com/mapfiles/kml/paddle/red-circle.png');
            var style = ge.createStyle(''); //create a new style
            style.getIconStyle().setIcon(icon); //apply the icon to the style
            changePlacemark.setStyleSelector(style); //apply the style to the placemark
      }

Of course you can put any style, any icon, whatever. I think your problem was to retrieve the element itself.

GL
function makePlacemark(iconHref, latitude, longitude, placemarkName, styleName){
		var placemark = ge.createPlacemark(placemarkName);
		placemark.setName(placemarkName);
		var icon = ge.createIcon('');
		icon.setHref(iconHref);
		var style = ge.createStyle(''); //create a new style
		style.getIconStyle().setIcon(icon); //apply the icon to the style
		placemark.setStyleSelector(style); //apply the style to the placemark
		var point = ge.createPoint('');
		point.setLatitude(latitude);
		point.setLongitude(longitude);
		placemark.setGeometry(point);
		ge.getFeatures().appendChild(placemark);
	}

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Expert Comment

by:heppa
ID: 33741690
oh, and of course, you would put '0001', if the button shows it! ;)
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Author Closing Comment

by:motokent
ID: 33743377
Thank you.  Good advice!
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