On this website:
http://www.crunchpanorama.com/
you use the google maps zoom control slider to zoom and recluster markers. I want to capture this event as well and perform actions accordingly.
Problem is when reading google docs, all I could find is the zoom_changed event of map. However, this event is not only called when changing zoom using slider, but also when clicking marker (which zooms into marker). So zoom_changed will not help me:
google.maps.event.addListener(map, 'zoom_changed', function () {
...
I want to be able to target the zoom change on the control slider specifically. How can I go about this?
Maybe there's a workaround similar to this:
var self = this;
google.maps.event.addListener(marker, 'click', function() {
// Set a boolean variable to true to indicate a marker/cluster has been clicked
self._markerClicked = true;
});
google.maps.event.addListener(map, 'zoom_changed', function() {
// Check the boolean variable and run your code if it's false
if ( !self._markerClicked ) {
// Take action here
} else {
// Reset variable back to false
self._markerClicked = false;
}
});
Ran into this recently. This is the best solution I have found if you want to capture when the map default zoom buttons are clicked. This assumes that the zoom buttons are the only ones in the div map container.
$("#id-container-name").on("click", "button", whateverfunction());
Related
I'm trying to write a custom event handler for CTRL + click in Leaflet. My problem is that the click location given by the map is different from the click location in the event handler, e.g. LatLng(51.49174, -0.11639) from the map click becomes LatLng(51.50938, -0.126) in the handler. The click locations match exactly if the map is the only thing on the page. Adding some other div elements above the map (like an <h1> title) makes the clicks not match. Panning the map also makes the click locations not match.
I'm wondering if I attached my L.DomEvent.on() correctly. Following the Leaflet Handlers tutorial, my code looks like
L.CtrlClickHandler = L.Handler.extend({
addHooks: function() {
L.DomEvent.on(document, 'click', this._captureClick, this);
},
removeHooks: function() {
L.DomEvent.off(document, 'click', this._captureClick, this);
},
_captureClick: function(event) {
if (event.ctrlKey) {
console.log('control click registered at layer '
+ map.layerPointToLatLng(new L.point(event.layerX, event.layerY)));
}
}
});
// add this to all maps
L.Map.addInitHook('addHandler', 'ctrlClick', L.CtrlClickHandler);
Here's a live example on JSFiddle.
I'm using Leaflet 0.7.7 due to some other dependencies in my code. Upgrading to Leaflet 1.0.1 makes it match better (e.g., LatLng(51.49868, -0.1018) vs. LatLng(51.4987, -0.1018)) but the two locations still are not exactly the same.
Am I attaching the L.DomEvent to the correct thing? Should that be attached to the map div somehow, as opposed to document?
Edit: Thanks to #AlexParij for the suggestion. I realized that panning the map also makes the clicks not match, with or without div elements above the map. This happens for Leaflet 1.0.1 as well as 0.7.7. I've tried every combination I can think of, combining different event locations (event.layerX, event.pageX, event.clientX, event.offsetX, event.screenX, and event.x) with projection methods layerPointToLatLng and unproject but none of them match the map click. Now I'm really confused... Fiddle with these different options and Leaflet 1.0.1: https://jsfiddle.net/c4tkyewz/
TL; DR: use map.mouseEventToLatLng() in a custom handler.
#AlexParij was correct; I was not using the correct definition of the layer points and container points. Inside the handler, event is different from Leaflet's internal mouse event (where the location is available from e.latlng).
I looked through Leaflet's core to find the answer. Getting the location from event requires taking the Mouse Event -> Container Point -> Layer Point -> latLng. Thankfully, the Leaflet developers already programmed a nice function for this: mouseEventToLatLng().
/*
* This is a custom handler to check if someone has control clicked
* the map and print the location of the click
*/
L.CtrlClickHandler = L.Handler.extend({
addHooks: function() {
L.DomEvent.on(document, 'click', this._captureClick, this);
},
removeHooks: function() {
L.DomEvent.off(document, 'click', this._captureClick, this);
},
_captureClick: function(event) {
if (event.ctrlKey) {
// translate mouse event to lat/lng (note: `mouseEventToLatLng()`
// calls Leaflet's `mouseEventToContainerPoint()` followed by
// `containerPointToLayerPoint()` and finally `layerPointToLatLng()`)
var latlng = map.mouseEventToLatLng(event);
console.log('Handler detected CTRL + click at ' + latlng);
}
}
});
// add this to all maps
L.Map.addInitHook('addHandler', 'ctrlClick', L.CtrlClickHandler);
Live example with Leaflet 1.0.1: https://jsfiddle.net/c4tkyewz/1/
Also tested with Leaflet 0.7.7.
As a bonus, to access the CTRL key directly from Leaflet's native handling of the click event map.on('click', function(e) {});, use e.originalEvent.ctrlKey.
I'm developing an app with Google Maps and Angularjs. I have this code to control whether the zoom is changed
google.maps.event.addListener(map, 'zoom_changed', function(){
});
The question is, I need to execute this event only when the user changes the zoom. I have in my code a fitBounds() that change the zoom as well.
var latlngbounds = new google.maps.LatLngBounds();
for (var i = 0; i < latlng.length; i++) {
latlngbounds.extend(latlng[i]);
}
map.fitBounds(latlngbounds);
Is there an option to distinguish between user action and not?
The current accepted solution may not properly solve this question in a general case. Go to the interactive demo for map UI events in the Google Maps API docs. Note that if you position your cursor on the map and scroll with your mouse's scroll wheel, none of the mouse or drag events are fired because the mouse remains stationary.
The current solution assumes that no programmatic map updates will occur after the mouseover event, which may be true for the original poster's application but might not be true in a more general application.
I propose the alternate solution below.
First, wherever you programmatically update the map in your code, set a custom property on the map—we'll call ours systemZoomChange—that indicates the change was initiated programmatically.
var latlngbounds = new google.maps.LatLngBounds();
for (var i = 0; i < latlng.length; i++) {
latlngbounds.extend(latlng[i]);
}
map.systemZoomChange = true
map.fitBounds(latlngbounds);
Then on any event listeners, add a check for the custom systemZoomChange property, and reset it if flagged, to avoid acting on system events.
map.addListener('zoom_changed', function () {
if (map.systemZoomChange) {
map.systemZoomChange = false // Reset the flag for a system-initiated event
} else {
// Handle the user-initiated event
}
});
Ok, I found the way
google.maps.event.addListenerOnce(map, 'mousemove', function(){
google.maps.event.addListener(map, 'zoom_changed', function(){
});
});
First, it detects if the mouse moves and then if the zoom if changed and works properly!
Just as the Title implies, I just added a "center_changed" listener to my map and the function is running more than once. I'm assuming it's because the center of the map is changing a bunch of times before the map comes to a rest, but I thought that that's what "drag" was for and that "center_changed only fires once after it comes to a rest??? The only reason I know its firing a bunch of times is because I have a drop shadow on the icon and it gets darker and darker over about two seconds before its completely black. If anyone needs my code, its below.
google.maps.event.addListener(map, 'center_changed', function() {
var zoomLevel = map.getZoom();
if (zoomLevel > 7) {
clearAll();
addmarker1();
addmarker2();
addmarker3();
addmarker4();
}
else {
clearAll();
}
});
These two functions fire only after your map comes to a rest
If you want your function to execute only when user drags(not programmatically) then use...
google.maps.event.addListener(map, 'dragend', function(){...}
But if you want your function to execute even when dragged, zoom changed programmatically(e.g. setZoom , fitBounds), then use...
google.maps.event.addListener(map, 'idle', function(){...}
I want to know when a Google Maps zoom_changed event is fired specifically by a user interaction with the +/- zoom buttons. If I use a general event listener for zoom_changed, I can't tell if it is a user-generated event or a zoom change caused by something like fitBounds(). Looking for the best way to do this.
I've tried the following things, none of which seem to work:
1) Looked for event information on zoom_changed. There appears to be none.
2) Add listeners for mouseover and mouseout that let me set a flag to see if the user is in the map bounds, and check the flag on zoom_changed. This doesn't work because the map does not consider the zoom buttons as part of the map frame (in other words, hovering over zoom buttons triggers the mouseout event).
3) Add a normal (non-gMap) listener to the zoom buttons. However, I can't find a definitive CSS selector that will allow me to grab just the buttons.
4) Looked for a function in the gMaps API that would let me do something like getZoomElements(), and then I could set listeners using that.
The weird thing is I can clearly do what I want if I add a custom control to the map. It seems very odd that they would force me to do that instead of having a hook into the default zoom controls.
I wouldn't just hook in to the +/- buttons (or buttons on your own custom control for that matter). The user can change the zoom on the map with the mouse wheel, or by double-clicking on the map. Plus, you'd be relying on implementation detail rather than documented API, which is a major no-no.
This really means the only reliable, documented way to detect a change in zoom is to listen to the zoom_changed event of the Map.
If your event handler can't determine whether the event came from user action or an API call, there's two approaches:
Set a flag before calling an API function so that you know you can ignore this change.
Can you re-architect your app such that it does not matter whether a zoom change came from code or the user?
I solved this issue by creating Custom Zoom buttons for my Map.
Here is the code from my project:
Edit: Removed unnecessary and self explanatory common code
your zoomControl function:
function zoomControl(map, div) {
var controlDiv = div,
control = this;
// Set styles to your own pa DIV
controlDiv.style.padding = '5px';
// Set CSS for the zoom in div.
var zoomIncrease = document.createElement('div');
zoomIncrease.title = 'Click to zoom in';
// etc.
// Set CSS for the zoom in interior.
var zoomIncreaseText = document.createElement('div');
// Use custom image
zoomIncreaseText.innerHTML = '<strong><img src="./images/plusBut.png" width="30px" height="30px"/></strong>';
zoomIncrease.appendChild(zoomIncreaseText);
// Set CSS for the zoom out div, in asimilar way
var zoomDecreaseText = document.createElement('div');
// .. Code .. Similar to above
// Set CSS for the zoom out interior.
// .. Code ..
// Setup the click event listener for Zoom Increase:
google.maps.event.addDomListener(zoomIncrease, 'click', function() {
zoom = MainMap.getZoom();
MainMap.setZoom(zoom+1);
// Other Code parts
});
// Setup the click event listener for Zoom decrease:
google.maps.event.addDomListener(zoomDecrease, 'click', function() {
zoom = MainMap.getZoom();
MainMap.setZoom(zoom-1);
});
}
your initialize function:
function initializeMap() {
var latlng = new google.maps.LatLng(38.6, -98);
var options = {
zoom : 5,
center : latlng,
mapTypeId : google.maps.MapTypeId.ROADMAP,
// Other Options
};
MainMap = new google.maps.Map(document.getElementById("google-map-canvas"),
options);
// The main part - Create your own Custom Zoom Buttons
// Create the DIV to hold the control and call the zoomControl()
var zoomControlDiv = document.createElement('div'),
zoomLevelControl = new zoomControl(MainMap, zoomControlDiv);
zoomControlDiv.index = 1;
MainMap.controls[google.maps.ControlPosition.RIGHT_TOP].push(zoomControlDiv);
}
Hope it helps
var zoomFlag = "user"; // always assume it's user unless otherwise
// some method changing the zoom through API
zoomFlag = "api";
map.setZoom(map.getZoom() - 1);
zoomFlag = "user";
// google maps event handler
zoom_changed: function() {
if (zoomFlag === "user") {
// user zoom
}
}
I was looking to do the same thing. I was hoping to find that there was a way built into the Google Maps API, but at a minimum, you should be able to store the starting zoom level as a variable when you initialize the map. Then, compare the result of getZoom() to it to know whether it was a zoom in or a zoom out.
For example:
map = new google.maps.Map(document.getElementById('map_canvas'), { zoom: 11 });
var previous_zoom = 11;
google.maps.event.addListener(map,'zoom_changed',function(){
if(map.getZoom() > previous_zoom) {
alert('You just zoomed in.');
}
previous_zoom = map.getZoom();
}
I would suggest using a custom control for zoom in/out and then using event listeners on the custom congrol:
http://goo.gl/u8gKC
You can easily hide the default zoom control:
http://goo.gl/N5HIE
(zoomControl to be specific)
I'm using the Infobox plugin for Google Maps V3 API (http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/docs/reference.html)
Is there anyway too close the infobox when the user clicks outside the infobox like on the map?
it's actually way easier if you have your infowindow as a global variable, or at least hold one variable that represents the single infobox you want to add at a convenient place.
edit: just to clarify: it should not be window.myInfoBox for example. With global I mean a single point where you reference your infobox
google.maps.event.addListener(map, 'click', function() {
if(infowindow){
infowindow.close();
}
});
that's all :-)
You will want to use addListener()
http://code.google.com/apis/maps/documentation/javascript/events.html#EventListeners
You can adapt the code found here:
google.maps.event.addListener(_point.popup, 'domready', function() {
//Have to put this within the domready or else it can't find the div element (it's null until the InfoBox is opened)
$(_point.popup.div_).hover(
function() {
//This is called when the mouse enters the element
},
function() {
//This is called when the mouse leaves the element
_point.popup.close();
}
);
});
Src:
Google Maps API v3 Event mouseover with InfoBox plugin
You can detect a map click with this:
google.maps.event.addListener(map, 'click', function() {
});
Infobox API:
http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/docs/reference.html
This maybe useful for you..
var inside = false;
$('#foo').live('mouseenter',function(){
inside=true;
}).live('mouseleave', function(){
inside=false;
});
$("body").mouseup(function(){
if(!inside) $('#foo').remove();
});