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Google Maps JS API: fitBounds and maintain center [duplicate]

I've been looking around for a solution to this problem, but i can't seem to find somthing that solves this. The closest i get is this thread. But this doesn't work.
What i'm trying to do is to run fitbounds based on a set of markers which works fine. But i would also like to center the map based on the users location (the bouncing marker in the plunk) and still keep all markers within the map view.
If i try to setCenter after fitBounds, some markers are outside of the map view.
Is there some nifty way of combining these two functions?
Here's the plunk illustrating the issue.
function initialize() {
var userCenter = new google.maps.LatLng(51.508742, -0.120850);
var userCenterMarker = new google.maps.Marker({
position: userCenter
});
userCenterMarker.setAnimation(google.maps.Animation.BOUNCE);
var mapProp = {
center: userCenter,
zoom: 12,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
var bounds = new google.maps.LatLngBounds();
var markers = getMarkers();
$(markers).each(function() {
bounds.extend(this.position);
this.setMap(map);
});
userCenterMarker.setMap(map);
map.fitBounds(bounds);
setTimeout(function() {
map.setCenter(userCenter);
}, 1500);
}
Thanks!

Simple solution: Add your "user marker" to the bounds, do fitBounds, then decrement the resulting zoom by 1 and center on that marker.
bounds.extend(userCenterMarker.getPosition());
map.fitBounds(bounds);
google.maps.event.addListenerOnce(map,'bounds_changed', function() {
map.setZoom(map.getZoom()-1);
});
working fiddle
More complex solution: Center on the "user marker", check to see if the marker bounds is completely included in the map's current bounds (map.getBounds().contains(markerBounds)), if not, decrement the zoom level by 1.

The above answer didn't work for me. Here's what did:
contained = true;
map.fitBounds(bounds);
map.setCenter(center);
newbounds = map.getBounds();
for (i = 0; i < l; i ++) {
if (!newbounds.contains(markers[i].getPosition())) {
contained = false;
}
}
if (!contained) map.setZoom(map.getZoom() - 1);

How to inverse geocode in google maps?

I have this code, this works perfectly to save my latitude and longitude. I read some articles here, they doesnt work for me. I know how to code with PHP but jquery and javascript are my frenemy.
I just can't edit cos' i dont know the syntax of this. I want to add the value to and input with the id, but i have to add the Decoded Address. I knoe Google maps have a way, they call it Geocode or something like that.
I have also a working model, but with geolocalization, and i can't change the vars, because i dont know how to. :(
PD: Is there a course Javascript for Dummies? It will help me to understand better.
function initialize() {
var myLatlng = new google.maps.LatLng(21.1675922,-86.8563953);
var mapProp = {
center:myLatlng,
zoom:13,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
var map=new google.maps.Map(document.getElementById("googleMap"), mapProp);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Tu casa u oficina',
draggable:true
});
document.getElementById('latitud').value= 21.1675922
document.getElementById('longitud').value= -86.8563953
document.getElementById('direccion').value= 'Direccion desconocida'
// marker drag event
google.maps.event.addListener(marker,'drag',function(event) {
document.getElementById('latitud').value = event.latLng.lat();
document.getElementById('longitud').value = event.latLng.lng();
});
//marker drag event end
google.maps.event.addListener(marker,'dragend',function(event) {
document.getElementById('latitud').value = event.latLng.lat();
document.getElementById('longitud').value = event.latLng.lng();
});
}
google.maps.event.addDomListener(window, 'load', initialize);

If you want a guide on how to do Reverse Geocoding, then you can check the Google documentation for it. It will provide you an example and sample code on how to make reverse geocoding by location and Place ID. For more information, check this tutorial.

Preserving Google map zoom to kml layer on checkbox click

I'm attempting to add multiple kml layers to a map that can be turned on and off with check boxes. I got that part working (yay!). When I click on a layer to turn it on, it zooms in (this is fine), but when I unclick to turn the layer off, it zooms back out to my map extent. How do I get it to preserve the zoom of the last loaded layer? Code below.
<script>
var map;
var watershedLayer = new google.maps.KmlLayer ({
url: 'http://mvihes.bc.ca/mapping/watersheds.kmz'
});
var ere1949Layer = new google.maps.KmlLayer ({
url: 'http://mvihes.bc.ca/mapping/ere1949.kmz'
});
function initialize() {
var parksville= new google.maps.LatLng(49.316786, -124.308768);
var mapOptions = {
zoom: 9,
center: parksville
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
check();
}
function check()
{
if(document.getElementById('watersheds').checked)
{watershedLayer.setMap(map);}
else
{watershedLayer.setMap(null);}
if(document.getElementById('ere1949').checked)
{ere1949Layer.setMap(map);}
else
{ere1949Layer.setMap(null);}
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
I tried using the preserveViewport function but it just stopped the layer from zooming in, which is not what I wanted. I'm new to javaScript so possibly I'm missing something obvious...any help would be appreciated!
jsfiddle

Set the map-property of a selected layer only when it's not set yet:
function check()
{
if(document.getElementById('watersheds').checked)
{if(!watershedLayer.getMap())watershedLayer.setMap(map);}
else
{watershedLayer.setMap(null);}
if(document.getElementById('ere1949').checked)
{if(!ere1949Layer.getMap())ere1949Layer.setMap(map);}
else
{ere1949Layer.setMap(null);}
}
http://jsfiddle.net/jhagmq7L/16/

You can also attach max and min zoom levels to the map, something to consider the over all map zoom when loading kml layers.
// sets the min and max zoom levels of the map
var opt = { minZoom: 6, maxZoom: 18 };
map.setOptions(opt);

jQuery/Javascript: Google Maps: How to toggle multiple pins on a map?

I have a database of locations which I want to be able to print on a map. Ideally there should be one map with multiple pins for each location you have toggled on. So click a button for location X and it shows up on the map. Click the button for location Y and it shows up on the same map. Click X again and it hides from the map.
Currently I have it so I click on X and the map gets redrawn centered around point X.
Here is the HTML for each button:
<input type='button' data-lat='38.89864400' data-long='-77.05283400'
data-when='20 Aug at 2:00am' value='Location X' class='click' />
The jQuery I'm using is:
jQuery(document).ready(
function initialize() {
jQuery("input.click").click(function() {
showOnMap(jQuery(this).data('lat'), jQuery(this).data('long'), jQuery(this).data('when'));
});
}
);
function showOnMap(lat, long, message) {
var myLatlng = new google.maps.LatLng(lat, long);
var mapOptions = {
zoom: 13,
center: myLatlng
}
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: message
});
google.maps.event.addDomListener(window, 'load', showOnMap);
}
Is there an easy way to switch from what I have to what I want? I've searched for a while but no one seems to be asking this use case in a browser, just Android (which I'm not doing).
Thanks!

There is an example in the documentation on how to hide/show markers. In short, a marker is:
hidden by setting its map to null
showed by setting its map to map
To do so, you will need to access each marker individually. If you have a definite number of locations, it can be done by naming them with different names (eg var markerLocationX, var markerLocationY, etc). Otherwise, the markers need to be stored in an array.
Supposing you have a definite number of known locations to toggle the markers, your javascript code may look like this:
function toggleMarker(markerName) {
if (markerName.getMap() == null) {
markerName.setMap(map);
} else {
markerName.setMap(null);
}
}

Getting data stored in additional field of googlemap's marker

I'm working with google maps api and javascript which I am not much familiar with. Here's the code I use to draw markers on my map. I get Latitudes and Longitudes from my database:
var geocoder;
var map;
var jsonStr = '<?php echo json_encode($arajka) ?>';
var LatLong = JSON.parse(jsonStr);
function initialize() {
geocoder = new google.maps.Geocoder();
var mapOptions = {
center: new google.maps.LatLng(50.000001, 20.000001),
zoom: 12
};
map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
var marker = [];
for(var i=0;i<LatLong.length;i++){
var LatLong1 = new google.maps.LatLng(LatLong[i].lat, LatLong[i].lon);
marker.ajdi=LatLong[i].id; // storing additional data (I need to get it when user clicks on certain marker)
marker.push(new google.maps.Marker({position: LatLong1, map: map, title: LatLong[i].login}));
}
// trying to set some listener but it fails.
google.maps.event.addListener(marker, 'click', function() {
map.setZoom(8);
map.setCenter(marker.getPosition());
alert("ASDASDASD" + marker.ajdi);
});
}
So, this listener doesn't work, I don't know why. Well, I expect that it doesn't exactly know what marker is it about. When I tried to do it with a single one, like in tutorial, it worked properly. I don't know what to do when I have this array. Any suggestions please?

You have several mistakes in your code:
As #Hollister mentions, marker is an array, so you need to put the addListener call inside the loop;
You have to store the additional marker data into the marker, not into the marker array;
you have to use this in the listener, not marker.
for(var i=0;i<LatLong.length;i++){
var LatLong1 = new google.maps.LatLng(LatLong[i].lat, LatLong[i].lon);
var this_marker = new google.maps.Marker({position: LatLong1, map: map, title: LatLong[i].login});
this_marker.ajdi=LatLong[i].id; // storing additional data (I need to get it when user clicks on certain marker)
marker.push(this_marker);
// trying to set some listener but it fails.
google.maps.event.addListener(this_marker, 'click', function() {
map.setZoom(8);
map.setCenter(this.getPosition());
alert("ASDASDASD" + this.ajdi);
});
}