Code
html
<!-- map input -->
<input type="text" id="the_geom" class="geometry form-control" name="the_geom" value='{"type":"Point","coordinates":[2.424573,48.845726]}'/>
<!-- data output -->
<div id="result" class="well"></div>
javscript
$('.geometry').geometryEditor();
var geometryEditor = $(".geometry").data('editor');
var map = geometryEditor.getMap();
/* Reading events on geometry changing */
map.on('change:geometry', function (e) {
var geoJSON = e.geometry;
var textResult;
if (!geoJSON) {
textResult = "No geoJSON geometry found";
} else {
textResult = "GeoJSON of geometry drawn : " + geoJSON + ".";
}
$("#result").html(textResult);
});