Gwt-Ext 2.0.3: Accessing Mapstraction API functions

abhijeet.maharana · **Joined:** Mon Mar 10, 2008 7:21 am **Posts:** 202

I want to geocode an address and obtain its latitude and longitude values.
Are there API calls for accessing the Mapstraction functions? Or do I need JSNI for calling Javascript functions to geocode addresses?

Regards,
Abhijeet Maharana.

abhijeet.maharana · **Joined:** Mon Mar 10, 2008 7:21 am **Posts:** 202

Some more info: I was able to get this Google Maps specific code running.

Code:

public native void updateMap(String locationAddress, JavaScriptObject llp, MainModule thisModule) /*-{
   var geo = new $wnd.GClientGeocoder();
 
   geo.getLocations(locationAddress, 
      function(response)       // callback method to be executed when result arrives from server
      {
         if (!response || response.Status.code != 200) 
         {
               alert("Unable to geocode that address");
         } 
         else 
               {
                var place = response.Placemark[0];
                llp.lat = place.Point.coordinates[1];
                llp.lon = place.Point.coordinates[0];
thisModule.@com.maharana.gwtextmaps.client.MainModule::renderMap(Lcom/google/gwt/core/client/JavaScriptObject;)(llp);
               }
            }
         );
}-*/;
 
 
public void renderMap(JavaScriptObject jsObj)
{
   double lat = Double.parseDouble(JavaScriptObjectHelper.getAttribute(jsObj, "lat"));
   double lon = Double.parseDouble(JavaScriptObjectHelper.getAttribute(jsObj, "lon"));
 
   LatLonPoint latLonPoint = new LatLonPoint(lat, lon);
   mapPanel.setCenterAndZoom(latLonPoint, 12);
   mapPanel.addMarker(new Marker(latLonPoint));
}

And the call to updateMap():

Code:

updateMap("mumbai", JavaScriptObjectHelper.createObject(), this);

I want to eliminate the JSNI method. Any suggestions?

-- Abhijeet Maharana.

sjivan · **Joined:** Fri Dec 14, 2007 12:27 pm **Posts:** 1017

Abhijeet,
Geocoding is not yet part of mapstraction, but I'll try to incorprorate your code into a Google specific class implmentation, and over time add implementations for other map providers.

btw great blog entry on the introduction to gwt-ext and maps

http://abhijeetmaharana.com/blog/2008/0 ... ogle-maps/

It would be great if you can add a this link to this URL in the GWT-Ext wiki along with your tips blog entry. I think many users can benefit from it.

btw a little tip on using Google maps is that you can always use the following key when working in host mode since the url is localhost:8888

Code:

<script type="text/javascript"
src="http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=ABQIAAAARrCK38aboqQKDotehUjrPhTb-vLQlFZmc2N8bgWI8YDPp5FEVBQ-MFjXfKfAvdbsbp3pa0q7fQNDDA"></script>

Thanks,
Sanjiv

abhijeet.maharana · **Joined:** Mon Mar 10, 2008 7:21 am **Posts:** 202

Ah! That clears my doubt. Will have to live with JSNI for the moment.
Ill update the wiki.

It seems that Mapstraction has partial support for geocoding or it is work in progress. It does provide MapstractionGeocoder which appears in the http://mapstraction.com/svn/source/mapstraction-geocode.js file. There is also a demo at http://mapstraction.com/geocode.php?geo ... p=mapquest.

However, it has support only for Google and Mapquest. And it also does not appear in the API documentation at http://mapstraction.com/doc/.

Thanks,
Abhijeet Maharana.

Gwt-Ext 2.0.3: Accessing Mapstraction API functions

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