Develop Reference

Google Maps on website, center is offset?

I want to center my map at these coords here (google maps website)
I copy pasted the coordinates in my website code:
<script>
function initialize() {
var map_canvas = document.getElementById('map_canvas');
var map_options = {
center: new google.maps.LatLng(56.4611388, -2.9719832),
zoom: 16,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(map_canvas, map_options)
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
Because my map slides down from the top of the page when user hovers over some text I call the function to refresh the map at the end of the animation:
$('#map').mouseover(function() {
if ($(this).offset().top == mapHiddenHeight) {
$(this).animate({
top: 0
}, 500, function() {
google.maps.event.trigger(map,'resize'); // refresh map
});
}
})
But the map is slightly offset from the center on my website. (Map drops down when you hover over "Find us on the map", top right)
NB: Actually I just noticed, if I clear the browser cache and load the website it appears at the right location. It's when you reload the page with cache full that it constantly displays with the same location offset. No matter how many times you refresh the page after that. So it only displays at correct location with a cleared cached, which of course is annoying.
I don't even know where to start debugging this. Tested on Chrome and Firefox,

Basically there is nothing to "debug", it may sound funny but when there is something that may be called "bug" it's the position you get when it works as expected.
When you trigger the resize-event the API re-calculates the size of the map to be able to load missing tiles. The API will not re-center the map based on the current center/size(the center of a hidden map usually is the location in the northwest-corner).
You must re-center the map on your own.
there are 2 options:
always center the map at the same position:
store the desired center as a map-option:
var map_options = {
center: new google.maps.LatLng(56.4611388, -2.9719832),
zoom: 18,
mapTypeId: google.maps.MapTypeId.ROADMAP,
//default-center, should have same value as center
originalCenter:new google.maps.LatLng(56.4611388, -2.9719832)
}
in the $.animate-callback first trigger the resize-event and then set the center of the map:
google.maps.event.trigger(map,'resize');
map.setCenter(map.get('originalCenter'));
center the map at the center before resizing(when a user drags the map this position will be restored):
inside the $.animate-callback:
var center=map.get('center');
google.maps.event.trigger(map,'resize');
map.setCenter(center);

Bounding view of a Leaflet image map to a landscape viewport

I have a square image 16384x16384 that has been sliced into tiles using MapTiler to create 6 levels of zoom in Leaflet.
I have set up the image in Leaflet as follows:
var map = L.map('map', {
maxZoom: 6,
minZoom: 0,
}).setView([0, 0],1);
var tilesURL = "_server/tiles/{z}/{x}/{y}.jpg";
L.tileLayer(tilesURL, {
maxZoom: 6,
continuousWorld: 'false',
tms: true
}).addTo(map);
How would I either:
Restrict the view of this large square image to just the middle (landscape rectangle) area?
Produce a non-square rectangular set of tiles?
Additionally, can Leaflet auto-fit the bounded area to the Map container?

Yes. Use the maxBounds option.
No idea, but why do you want to do such a thing?
Yes: the method fitBounds does that.

Couldn't edit #L. Sanna code since the queue is full but I would like to contribute with an example on how to use maxBounds for the first question.
I am using Leaflet 1.7.1 on Angular
Note:
maxBounds() accepts latLngBounds data type as an argument. In my case I used a tuple holding the two coordinates.
maxboundViscosity() accepts a value between 0.0-1.0 that will control how solid the bounds are when dragging the map out of bounds. Value on 1 will prevent any out of bounds areas from showing.
Tip: Adjust you minZoom to have the view not show any out of bound areas.
this.map = L.map('map', {
maxBounds: [[-90, -260],[90, 260]],
maxBoundsViscosity: 1,
center: [39.8282, -98.5795],
zoom: 5,
zoomSnap: 0.15 // enables fractional zooms
});
Happy coding!

Multiple instances of Google Maps on one page

I have a form that allows you to preview coordinates via a google map. The user can dynamically add multiple sets of coordinates to the form. The amount of coordinates are variable.
I loop through the variables with this code which I feel it has to do with loading multiple instances of google maps. The first map loads just fine, but the second map only loads one tile in the far left hand corner. IF I update the coordinates on the form, then all of the maps only show one tile in the far left hand corner.
while (tempClone != cloneCount) {
var lat_lng = new google.maps.LatLng(lat, lng);
options = {
zoom: 14,
center: lat_lng,
panControl: false,
zoomControl: false,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
map[tempClone] = new google.maps.Map(document.getElementById("map"+tempClone), options);
var infowindow = new google.maps.InfoWindow({
content: inputBL[tempClone][0][1] + 'Entrance'
});
marker[tempClone] = new google.maps.Marker({
position: lat_lng,
map: map[tempClone],
title: inputBL[tempClone][0][1]
});
}
Thank you for any help!
Aaron

It almost looks like you're having trouble getting the map to resize. From what I recall this happens if the map container size changes. Can you try triggering a resize after showing the map?
google.maps.event.trigger(map, "resize");

Showing a specific location in gMAP

i want to show a map in a floating DIV. The thing i want to do is that i want to a specific location with it is first visible. for example: when it is visible i wnat to show banglore city. by default it show some of cities of USA i guess. Is it possible to do so....????

Yes, absolutely. You just have to set the map's center to the Lat Lng where you wish to initially show. For instance:
html (your DIV):
<div id='map_canvas'></div>
google map api v3 JavaScript run when onload:
var initCenter = new google.maps.LatLng(12.970214, 77.56029); //city of bangalor 12.970214, 77.56029
//create the google map and grabing the DIV
var map = new google.maps.Map(document.getElementById('map_canvas'), {
zoom: 10,
center: initCenter, //setting the city of bangalor as center point of your map
mapTypeId: google.maps.MapTypeId.ROADMAP
});
Here is the jsfiddle demo.

Can ScrollWheel be disabled in a custom street view?

I am building a site and I have a page which takes an address and uses it to generate a 2D roadmap style google-map and then next to it, the street view for that address.
My problem is that these two maps span almost the entire width of the site and the user is likely to have their mouse go over it when scrolling down the page and get confused by their inability to scroll down further (while zooming into a map).
Disabling this for the 2D map was pretty strait forward
//works to disable scroll wheel in 2D map
var mapOptions = {
zoom: 12,
center: latlng,
scrollwheel: false,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions );
//not working to disable scroll wheel in panorama
var panoramaOptions = {
position: results[0].geometry.location,
scrollwheel: false
};
panorama = new google.maps.StreetViewPanorama(document.getElementById("map_canvas2"), panoramaOptions );
but the street view does not seem to allow me to disable the scroll wheel using these options and I am not able to find this issue addressed in the google-docs. Anyone know if this CAN be done or suggestions on how to approach it?

There was a feature request with Gmaps API v3 issues to add scrollwheel: false to streetview http://code.google.com/p/gmaps-api-issues/issues/detail?id=2557. This is now fixed, just use scrollwheel: false within your StreetViewPanorama options.

I am having the same problem, when the user scrolls down using the mouse wheel, the cursor gets caught in the Google street view and starts zooming instead of scrolling down the page.
In Google Maps they provide the scrollwheel property which can disable this, but unfortunately this does not seem to be implemented in Street view.
The only workaround I found as of now is as #bennedich said in the previous answer, I placed an empty/transparent div exactly over the street view div.
I am enabling the controls when the user clicks anywhere over the street view area by using jQuery to hide this empty div (using css visibility property) on mousedown event and when the user moves his mouse out I am placing this empty div back over. Which basically means everytime the user wants to interact with the street view control he has to click it once. It's not the best solution but it's better than getting your mouse caught up when scrolling

Don't know about the javascript way, but with html and css you can place an invisible div with higher z-index over the map/streetview.

There is a patch coming up from Google to address this issue.
The fix that works for now is to set the version number explicitly to 3.25 for scrollwheel: false to work.
Example:
https://maps.googleapis.com/maps/api/js?key=XXX&v=3.25

My solution was the following. As soon as the mouse is scrolled on the street view using the "wheel" event, then do the scroll artificially and bring an overlay to the front.
$('.streetViewOverlay').click(function(e) {
$(this).addClass('streetViewOverlayClicked');
});
document.querySelector('#street-view').addEventListener("wheel", function(evt) {
$(document).scrollTop($(document).scrollTop() + evt.deltaY);
$('.streetViewOverlay').removeClass('streetViewOverlayClicked');
});
$('#street-view').mouseleave(function() {
$('.streetViewOverlay').removeClass('streetViewOverlayClicked');
});
var panorama;
function initialize() {
panorama = new google.maps.StreetViewPanorama(
document.getElementById('street-view'),
{
position: {lat: 37.869260, lng: -122.254811},
pov: {heading: 165, pitch: 0},
zoom: 1,
gestureHandling: 'cooperative',
scrollwheel: false
});
}
.streetViewOverlay {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
z-index: 2;
opacity: 0;
}
.streetViewOverlayClicked {
z-index: 1;
}