zoom_changed triggering repeatedly on page load - google-maps

Question

Using the Google Maps API, I've got two listeners in my initMap() function:
google.maps.event.addListener(map, 'dragend', function(e) {
var searchType=location.search.split('=').pop();
MAPSEARCH.MY.searchOnLoc(false, searchType);
});
google.maps.event.addListener(map, 'zoom_changed', function(e) {
var searchType=location.search.split('=').pop();
MAPSEARCH.MY.searchOnLoc(false, searchType);
});
The first one works fine, but the second (zoom_changed) triggers several times while the page is loading, causing all kinds of chaos. How can I prevent this?
For testing purposes, I've tried changing to bounds_changed but it also triggers an extra time when the page is loading.

Answer 1

There must be something else causing what you describe. Just loading a map doesn't trigger a zoom change as you can see in the below example.
function initialize() {
var myLatLng = new google.maps.LatLng(46.2,6.17);
var mapOptions = {
zoom: 4,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoomControl: true
};
var map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
var marker = new google.maps.Marker({
position: myLatLng,
map: map
});
google.maps.event.addListener(map, 'zoom_changed', function() {
alert('Zoom Changed');
});
}
initialize();
#map-canvas {
height: 150px;
}
<div id="map-canvas"></div>
<script src="https://maps.googleapis.com/maps/api/js"></script>

Answer 2

I found a way to prevent the zoom_changed listener from loading until the map has finished loading:
google.maps.event.addListenerOnce(map, 'tilesloaded', function() {
google.maps.event.addListener(map, 'zoom_changed', function (e) {
// var eventListener = google.maps.event.addListener(this.map, "bounds_changed", function () {
var searchType = location.search.split('=').pop();
MAPSEARCH.MY.searchOnLoc(false, searchType);
// });
});
})