Get the current camera zoom level.
<div class="map" id="map_canvas">
<span class="smallPanel"><button>Click here</button></span>
</div>
var div = document.getElementById("map_canvas");
var map = plugin.google.maps.Map.getMap(div);
map.one(plugin.google.maps.event.MAP_READY, function() {
var button = div.getElementsByTagName('button')[0];
button.addEventListener('click', function() {
// Show the current camera zoom level.
alert("zoom: " + map.getCameraZoom());
});
});