From 28eb054511212d154ab3e1d9a2603e39c524f77e Mon Sep 17 00:00:00 2001
From: SergioGutTal <sergio@haystaqdna.com>
Date: Thu, 13 Jul 2017 10:38:04 -0400
Subject: [PATCH 1/4] Updated src file to latest built dist

---
 src/leaflet.utfgrid.js | 43 ++++++++++++++++++++++--------------------
 1 file changed, 23 insertions(+), 20 deletions(-)

diff --git a/src/leaflet.utfgrid.js b/src/leaflet.utfgrid.js
index 3705b05..3086f22 100644
--- a/src/leaflet.utfgrid.js
+++ b/src/leaflet.utfgrid.js
@@ -1,32 +1,35 @@
-L.Util.ajax = function (url, timeout, success, error) {
-
+L.Util.ajax = function (url, success, error) {
+	// the following is from JavaScript: The Definitive Guide
+	// and https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest_in_IE6
 	if (window.XMLHttpRequest === undefined) {
-		error(new Error("XMLHttpRequest is not supported"));
+		window.XMLHttpRequest = function () {
+			/*global ActiveXObject:true */
+			try {
+				return new ActiveXObject("Microsoft.XMLHTTP");
+			}
+			catch  (e) {
+				throw new Error("XMLHttpRequest is not supported");
+			}
+		};
 	}
 	var response, request = new XMLHttpRequest();
 	request.open("GET", url);
 	request.onreadystatechange = function () {
+		/*jshint evil: true */
 		if (request.readyState === 4) {
 			if (request.status === 200) {
 				if (window.JSON) {
-					try {
-						response = JSON.parse(request.responseText);
-						success(response);
-					} catch(e) {
-						error(e);
-					}
+					response = JSON.parse(request.responseText);
 				} else {
-					error(new Error('json not supported'));
+					response = eval("(" + request.responseText + ")");
 				}
-			} else if (!request.status) {
-				error('Attempted cross origin request without CORS enabled');
-			} else {
+				success(response);
+			} else if (request.status !== 0 && error !== undefined) {
 				error(request.status);
 			}
 		}
 	};
 	request.ontimeout = function () { error('timeout'); };
-	request.timeout = timeout;
 	request.send();
 	return request;
 };
@@ -83,7 +86,7 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 
 		this._update();
 
-		var zoom = this._map.getZoom();
+		var zoom = Math.round(this._map.getZoom());
 
 		if (zoom > this.options.maxZoom || zoom < this.options.minZoom) {
 			return;
@@ -185,7 +188,7 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 	_update: function () {
 
 		var bounds = this._map.getPixelBounds(),
-		    zoom = this._map.getZoom(),
+		    zoom = Math.round(this._map.getZoom()),
 		    tileSize = this.options.tileSize;
 
 		if (zoom > this.options.maxZoom || zoom < this.options.minZoom) {
@@ -278,9 +281,10 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 
 	_ajaxRequestFactory: function (key, url) {
 		var successCallback = this._successCallbackFactory(key);
-		var errorCallback = this._errorCallbackFactory(url, key);
+		var errorCallback = this._errorCallbackFactory(url);
 		return function () {
-			var request = L.Util.ajax(url, this.options.requestTimeout, successCallback, errorCallback);
+			var request = L.Util.ajax(url, successCallback, errorCallback);
+			request.timeout = this.options.requestTimeout;
 			return request;
 		}.bind(this);
 	},
@@ -292,9 +296,8 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 		}.bind(this);
 	},
 
-	_errorCallbackFactory: function (tileurl, key) {
+	_errorCallbackFactory: function (tileurl) {
 		return function (statuscode) {
-			this._finish_request(key);
 			this.fire('tileerror', {
 				url: tileurl,
 				code: statuscode

From dfae3815354ad210e12b08901292eba862dbfa38 Mon Sep 17 00:00:00 2001
From: SergioGutTal <sergio@haystaqdna.com>
Date: Thu, 13 Jul 2017 10:43:16 -0400
Subject: [PATCH 2/4] Fixed L.Util.ajax to work with Leaflet 1.1.x

---
 dist/leaflet.utfgrid-src.js | 5 +++--
 dist/leaflet.utfgrid.js     | 2 +-
 src/leaflet.utfgrid.js      | 4 ++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/dist/leaflet.utfgrid-src.js b/dist/leaflet.utfgrid-src.js
index de36722..10b9a3d 100644
--- a/dist/leaflet.utfgrid-src.js
+++ b/dist/leaflet.utfgrid-src.js
@@ -7,7 +7,7 @@
  */
 (function (window, undefined) {
 
-L.Util.ajax = function (url, success, error) {
+L.ajax = function (url, success, error) {
 	// the following is from JavaScript: The Definitive Guide
 	// and https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest_in_IE6
 	if (window.XMLHttpRequest === undefined) {
@@ -292,7 +292,7 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 		var successCallback = this._successCallbackFactory(key);
 		var errorCallback = this._errorCallbackFactory(url);
 		return function () {
-			var request = L.Util.ajax(url, successCallback, errorCallback);
+			var request = L.ajax(url, successCallback, errorCallback);
 			request.timeout = this.options.requestTimeout;
 			return request;
 		}.bind(this);
@@ -411,4 +411,5 @@ L.utfGrid = function (url, options) {
 
 
 
+
 }(window));
\ No newline at end of file
diff --git a/dist/leaflet.utfgrid.js b/dist/leaflet.utfgrid.js
index 3d1da4e..ba79661 100644
--- a/dist/leaflet.utfgrid.js
+++ b/dist/leaflet.utfgrid.js
@@ -5,4 +5,4 @@
  *
  * @license MIT
  */
-(function(window,undefined){L.Util.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(e){throw Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){request.readyState===4&&(request.status===200?(window.JSON?response=JSON.parse(request.responseText):response=eval("("+request.responseText+")"),success(response)):request.status!==0&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Mixin.Events,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(e,t){L.Util.setOptions(this,t),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=e,this._cache={};var n=0;while(window["lu"+n])n++;this._windowKey="lu"+n,window[this._windowKey]={};var r=this.options.subdomains;typeof this.options.subdomains=="string"&&(this.options.subdomains=r.split(""))},onAdd:function(e){this._map=e,this._container=this._map._container,this._update();var t=this._map.getZoom();if(t>this.options.maxZoom||t<this.options.minZoom)return;e.on("click",this._click,this),e.on("mousemove",this._move,this),e.on("moveend",this._update,this)},onRemove:function(){var e=this._map;e.off("click",this._click,this),e.off("mousemove",this._move,this),e.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(e,t){return this._url=e,t||this.redraw(),this},redraw:function(){this._request_queue=[];for(var e in this._requests)this._requests.hasOwnProperty(e)&&this._abort_request(e);this._cache={},this._update()},_click:function(e){this.fire("click",this._objectForEvent(e))},_move:function(e){var t=this._objectForEvent(e);t.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:e.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),t.data&&(this.fire("mouseover",t),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=t.data):t.data&&this.fire("mousemove",t)},_objectForEvent:function(e){var t=this._map,n=t.project(e.latlng),r=this.options.tileSize,i=this.options.resolution,s=Math.floor(n.x/r),o=Math.floor(n.y/r),u=Math.floor((n.x-s*r)/i),a=Math.floor((n.y-o*r)/i),f=t.options.crs.scale(t.getZoom())/r;s=(s+f)%f,o=(o+f)%f;var l=this._cache[t.getZoom()+"_"+s+"_"+o],c=null;if(l&&l.grid){var h=this._utfDecode(l.grid[a].charCodeAt(u)),p=l.keys[h];l.data.hasOwnProperty(p)&&(c=l.data[p])}return L.extend({latlng:e.latlng,data:c},e)},_update:function(){var e=this._map.getPixelBounds(),t=this._map.getZoom(),n=this.options.tileSize;if(t>this.options.maxZoom||t<this.options.minZoom)return;var r=new L.Point(Math.floor(e.min.x/n),Math.floor(e.min.y/n)),i=new L.Point(Math.floor(e.max.x/n),Math.floor(e.max.y/n)),s=this._map.options.crs.scale(t)/n,o=[];for(var u=r.x;u<=i.x;u++)for(var a=r.y;a<=i.y;a++){var f=(u+s)%s,l=(a+s)%s,c=t+"_"+f+"_"+l;o.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(t,f,l):this._loadTile(t,f,l))}for(var h in this._requests)o.indexOf(h)<0&&this._abort_request(h)},_loadTileP:function(e,t,n){var r=document.getElementsByTagName("head")[0],i=e+"_"+t+"_"+n,s="lu_"+i,o=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:t,y:n}),z:e,x:t,y:n,cb:o+"."+s},this.options)),f=document.createElement("script");f.setAttribute("type","text/javascript"),f.setAttribute("src",a),window[o][s]=function(e){u._cache[i]=e,delete window[o][s],r.removeChild(f),u._finish_request(i)},this._queue_request(i,a,function(){return r.appendChild(f),{abort:function(){r.removeChild(f)}}})},_loadTile:function(e,t,n){var r=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:t,y:n}),z:e,x:t,y:n},this.options)),i=e+"_"+t+"_"+n;this._queue_request(i,r,this._ajaxRequestFactory(i,r))},_ajaxRequestFactory:function(e,t){var n=this._successCallbackFactory(e),r=this._errorCallbackFactory(t);return function(){var e=L.Util.ajax(t,n,r);return e.timeout=this.options.requestTimeout,e}.bind(this)},_successCallbackFactory:function(e){return function(t){this._cache[e]=t,this._finish_request(e)}.bind(this)},_errorCallbackFactory:function(e){return function(t){this.fire("tileerror",{url:e,code:t})}.bind(this)},_queue_request:function(e,t,n){this._requests[e]={callback:n,timeout:null,handler:null,url:t},this._request_queue.push(e),this._process_queued_requests()},_finish_request:function(e){var t=this._requests_in_process.indexOf(e);t>=0&&this._requests_in_process.splice(t,1),t=this._request_queue.indexOf(e),t>=0&&this._request_queue.splice(t,1),this._requests[e]&&(this._requests[e].timeout&&window.clearTimeout(this._requests[e].timeout),delete this._requests[e]),this._process_queued_requests(),this._requests_in_process.length===0&&this.fire("load")},_abort_request:function(e){this._requests[e]&&this._requests[e].handler&&typeof this._requests[e].handler.abort=="function"&&this._requests[e].handler.abort(),this._cache[e]===null&&delete this._cache[e],this._finish_request(e)},_process_queued_requests:function(){while(this._request_queue.length>0&&(this.options.maxRequests===0||this._requests_in_process.length<this.options.maxRequests))this._process_request(this._request_queue.pop())},_process_request:function(e){this._requests_in_process.push(e);var t=this._requests[e].callback();if(this._requests[e]){this._requests[e].handler=t;if(t.timeout===undefined){var n=this._timeoutCallbackFactory(e);this._requests[e].timeout=window.setTimeout(n,this.options.requestTimeout)}}},_timeoutCallbackFactory:function(e){var t=this._requests[e].url;return function(){this.fire("tileerror",{url:t,code:"timeout"}),this._abort_request(e)}.bind(this)},_utfDecode:function(e){return e>=93&&e--,e>=35&&e--,e-32}}),L.utfGrid=function(e,t){return new L.UtfGrid(e,t)}})(window);
\ No newline at end of file
+!function(window,undefined){L.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(t){throw new Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){4===request.readyState&&(200===request.status?(response=window.JSON?JSON.parse(request.responseText):eval("("+request.responseText+")"),success(response)):0!==request.status&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Mixin.Events,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(t,e){L.Util.setOptions(this,e),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=t,this._cache={};for(var s=0;window["lu"+s];)s++;this._windowKey="lu"+s,window[this._windowKey]={};var i=this.options.subdomains;"string"==typeof this.options.subdomains&&(this.options.subdomains=i.split(""))},onAdd:function(t){this._map=t,this._container=this._map._container,this._update();var e=Math.round(this._map.getZoom());e>this.options.maxZoom||e<this.options.minZoom||(t.on("click",this._click,this),t.on("mousemove",this._move,this),t.on("moveend",this._update,this))},onRemove:function(){var t=this._map;t.off("click",this._click,this),t.off("mousemove",this._move,this),t.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(t,e){return this._url=t,e||this.redraw(),this},redraw:function(){this._request_queue=[];for(var t in this._requests)this._requests.hasOwnProperty(t)&&this._abort_request(t);this._cache={},this._update()},_click:function(t){this.fire("click",this._objectForEvent(t))},_move:function(t){var e=this._objectForEvent(t);e.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:t.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),e.data&&(this.fire("mouseover",e),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=e.data):e.data&&this.fire("mousemove",e)},_objectForEvent:function(t){var e=this._map,s=e.project(t.latlng),i=this.options.tileSize,o=this.options.resolution,r=Math.floor(s.x/i),n=Math.floor(s.y/i),u=Math.floor((s.x-r*i)/o),a=Math.floor((s.y-n*i)/o),h=e.options.crs.scale(e.getZoom())/i;r=(r+h)%h,n=(n+h)%h;var _=this._cache[e.getZoom()+"_"+r+"_"+n],c=null;if(_&&_.grid){var l=this._utfDecode(_.grid[a].charCodeAt(u)),d=_.keys[l];_.data.hasOwnProperty(d)&&(c=_.data[d])}return L.extend({latlng:t.latlng,data:c},t)},_update:function(){var t=this._map.getPixelBounds(),e=Math.round(this._map.getZoom()),s=this.options.tileSize;if(!(e>this.options.maxZoom||e<this.options.minZoom)){for(var i=new L.Point(Math.floor(t.min.x/s),Math.floor(t.min.y/s)),o=new L.Point(Math.floor(t.max.x/s),Math.floor(t.max.y/s)),r=this._map.options.crs.scale(e)/s,n=[],u=i.x;u<=o.x;u++)for(var a=i.y;a<=o.y;a++){var h=(u+r)%r,_=(a+r)%r,c=e+"_"+h+"_"+_;n.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(e,h,_):this._loadTile(e,h,_))}for(var l in this._requests)n.indexOf(l)<0&&this._abort_request(l)}},_loadTileP:function(t,e,s){var i=document.getElementsByTagName("head")[0],o=t+"_"+e+"_"+s,r="lu_"+o,n=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s,cb:n+"."+r},this.options)),h=document.createElement("script");h.setAttribute("type","text/javascript"),h.setAttribute("src",a),window[n][r]=function(t){u._cache[o]=t,delete window[n][r],i.removeChild(h),u._finish_request(o)},this._queue_request(o,a,function(){return i.appendChild(h),{abort:function(){i.removeChild(h)}}})},_loadTile:function(t,e,s){var i=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s},this.options)),o=t+"_"+e+"_"+s;this._queue_request(o,i,this._ajaxRequestFactory(o,i))},_ajaxRequestFactory:function(t,e){var s=this._successCallbackFactory(t),i=this._errorCallbackFactory(e);return function(){var t=L.ajax(e,s,i);return t.timeout=this.options.requestTimeout,t}.bind(this)},_successCallbackFactory:function(t){return function(e){this._cache[t]=e,this._finish_request(t)}.bind(this)},_errorCallbackFactory:function(t){return function(e){this.fire("tileerror",{url:t,code:e})}.bind(this)},_queue_request:function(t,e,s){this._requests[t]={callback:s,timeout:null,handler:null,url:e},this._request_queue.push(t),this._process_queued_requests()},_finish_request:function(t){var e=this._requests_in_process.indexOf(t);e>=0&&this._requests_in_process.splice(e,1),e=this._request_queue.indexOf(t),e>=0&&this._request_queue.splice(e,1),this._requests[t]&&(this._requests[t].timeout&&window.clearTimeout(this._requests[t].timeout),delete this._requests[t]),this._process_queued_requests(),0===this._requests_in_process.length&&this.fire("load")},_abort_request:function(t){this._requests[t]&&this._requests[t].handler&&"function"==typeof this._requests[t].handler.abort&&this._requests[t].handler.abort(),null===this._cache[t]&&delete this._cache[t],this._finish_request(t)},_process_queued_requests:function(){for(;this._request_queue.length>0&&(0===this.options.maxRequests||this._requests_in_process.length<this.options.maxRequests);)this._process_request(this._request_queue.pop())},_process_request:function(t){this._requests_in_process.push(t);var e=this._requests[t].callback();if(this._requests[t]&&(this._requests[t].handler=e,e.timeout===undefined)){var s=this._timeoutCallbackFactory(t);this._requests[t].timeout=window.setTimeout(s,this.options.requestTimeout)}},_timeoutCallbackFactory:function(t){var e=this._requests[t].url;return function(){this.fire("tileerror",{url:e,code:"timeout"}),this._abort_request(t)}.bind(this)},_utfDecode:function(t){return t>=93&&t--,t>=35&&t--,t-32}}),L.utfGrid=function(t,e){return new L.UtfGrid(t,e)}}(window);;
\ No newline at end of file
diff --git a/src/leaflet.utfgrid.js b/src/leaflet.utfgrid.js
index 3086f22..eb3ba47 100644
--- a/src/leaflet.utfgrid.js
+++ b/src/leaflet.utfgrid.js
@@ -1,4 +1,4 @@
-L.Util.ajax = function (url, success, error) {
+L.ajax = function (url, success, error) {
 	// the following is from JavaScript: The Definitive Guide
 	// and https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest/Using_XMLHttpRequest_in_IE6
 	if (window.XMLHttpRequest === undefined) {
@@ -283,7 +283,7 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 		var successCallback = this._successCallbackFactory(key);
 		var errorCallback = this._errorCallbackFactory(url);
 		return function () {
-			var request = L.Util.ajax(url, successCallback, errorCallback);
+			var request = L.ajax(url, successCallback, errorCallback);
 			request.timeout = this.options.requestTimeout;
 			return request;
 		}.bind(this);

From f38a8ea78559fe34550d357ebac1563caff382c3 Mon Sep 17 00:00:00 2001
From: SergioGutTal <sergio@haystaqdna.com>
Date: Thu, 13 Jul 2017 10:45:05 -0400
Subject: [PATCH 3/4] Updated future leaflet deprecation: L.Mixin.Events to
 L.Evented

---
 dist/leaflet.utfgrid-src.js | 2 +-
 dist/leaflet.utfgrid.js     | 2 +-
 src/leaflet.utfgrid.js      | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/dist/leaflet.utfgrid-src.js b/dist/leaflet.utfgrid-src.js
index 10b9a3d..57e1a21 100644
--- a/dist/leaflet.utfgrid-src.js
+++ b/dist/leaflet.utfgrid-src.js
@@ -43,7 +43,7 @@ L.ajax = function (url, success, error) {
 	return request;
 };
 L.UtfGrid = (L.Layer || L.Class).extend({
-	includes: L.Mixin.Events,
+	includes: L.Evented,
 	options: {
 		subdomains: 'abc',
 
diff --git a/dist/leaflet.utfgrid.js b/dist/leaflet.utfgrid.js
index ba79661..cfb1a8e 100644
--- a/dist/leaflet.utfgrid.js
+++ b/dist/leaflet.utfgrid.js
@@ -5,4 +5,4 @@
  *
  * @license MIT
  */
-!function(window,undefined){L.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(t){throw new Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){4===request.readyState&&(200===request.status?(response=window.JSON?JSON.parse(request.responseText):eval("("+request.responseText+")"),success(response)):0!==request.status&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Mixin.Events,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(t,e){L.Util.setOptions(this,e),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=t,this._cache={};for(var s=0;window["lu"+s];)s++;this._windowKey="lu"+s,window[this._windowKey]={};var i=this.options.subdomains;"string"==typeof this.options.subdomains&&(this.options.subdomains=i.split(""))},onAdd:function(t){this._map=t,this._container=this._map._container,this._update();var e=Math.round(this._map.getZoom());e>this.options.maxZoom||e<this.options.minZoom||(t.on("click",this._click,this),t.on("mousemove",this._move,this),t.on("moveend",this._update,this))},onRemove:function(){var t=this._map;t.off("click",this._click,this),t.off("mousemove",this._move,this),t.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(t,e){return this._url=t,e||this.redraw(),this},redraw:function(){this._request_queue=[];for(var t in this._requests)this._requests.hasOwnProperty(t)&&this._abort_request(t);this._cache={},this._update()},_click:function(t){this.fire("click",this._objectForEvent(t))},_move:function(t){var e=this._objectForEvent(t);e.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:t.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),e.data&&(this.fire("mouseover",e),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=e.data):e.data&&this.fire("mousemove",e)},_objectForEvent:function(t){var e=this._map,s=e.project(t.latlng),i=this.options.tileSize,o=this.options.resolution,r=Math.floor(s.x/i),n=Math.floor(s.y/i),u=Math.floor((s.x-r*i)/o),a=Math.floor((s.y-n*i)/o),h=e.options.crs.scale(e.getZoom())/i;r=(r+h)%h,n=(n+h)%h;var _=this._cache[e.getZoom()+"_"+r+"_"+n],c=null;if(_&&_.grid){var l=this._utfDecode(_.grid[a].charCodeAt(u)),d=_.keys[l];_.data.hasOwnProperty(d)&&(c=_.data[d])}return L.extend({latlng:t.latlng,data:c},t)},_update:function(){var t=this._map.getPixelBounds(),e=Math.round(this._map.getZoom()),s=this.options.tileSize;if(!(e>this.options.maxZoom||e<this.options.minZoom)){for(var i=new L.Point(Math.floor(t.min.x/s),Math.floor(t.min.y/s)),o=new L.Point(Math.floor(t.max.x/s),Math.floor(t.max.y/s)),r=this._map.options.crs.scale(e)/s,n=[],u=i.x;u<=o.x;u++)for(var a=i.y;a<=o.y;a++){var h=(u+r)%r,_=(a+r)%r,c=e+"_"+h+"_"+_;n.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(e,h,_):this._loadTile(e,h,_))}for(var l in this._requests)n.indexOf(l)<0&&this._abort_request(l)}},_loadTileP:function(t,e,s){var i=document.getElementsByTagName("head")[0],o=t+"_"+e+"_"+s,r="lu_"+o,n=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s,cb:n+"."+r},this.options)),h=document.createElement("script");h.setAttribute("type","text/javascript"),h.setAttribute("src",a),window[n][r]=function(t){u._cache[o]=t,delete window[n][r],i.removeChild(h),u._finish_request(o)},this._queue_request(o,a,function(){return i.appendChild(h),{abort:function(){i.removeChild(h)}}})},_loadTile:function(t,e,s){var i=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s},this.options)),o=t+"_"+e+"_"+s;this._queue_request(o,i,this._ajaxRequestFactory(o,i))},_ajaxRequestFactory:function(t,e){var s=this._successCallbackFactory(t),i=this._errorCallbackFactory(e);return function(){var t=L.ajax(e,s,i);return t.timeout=this.options.requestTimeout,t}.bind(this)},_successCallbackFactory:function(t){return function(e){this._cache[t]=e,this._finish_request(t)}.bind(this)},_errorCallbackFactory:function(t){return function(e){this.fire("tileerror",{url:t,code:e})}.bind(this)},_queue_request:function(t,e,s){this._requests[t]={callback:s,timeout:null,handler:null,url:e},this._request_queue.push(t),this._process_queued_requests()},_finish_request:function(t){var e=this._requests_in_process.indexOf(t);e>=0&&this._requests_in_process.splice(e,1),e=this._request_queue.indexOf(t),e>=0&&this._request_queue.splice(e,1),this._requests[t]&&(this._requests[t].timeout&&window.clearTimeout(this._requests[t].timeout),delete this._requests[t]),this._process_queued_requests(),0===this._requests_in_process.length&&this.fire("load")},_abort_request:function(t){this._requests[t]&&this._requests[t].handler&&"function"==typeof this._requests[t].handler.abort&&this._requests[t].handler.abort(),null===this._cache[t]&&delete this._cache[t],this._finish_request(t)},_process_queued_requests:function(){for(;this._request_queue.length>0&&(0===this.options.maxRequests||this._requests_in_process.length<this.options.maxRequests);)this._process_request(this._request_queue.pop())},_process_request:function(t){this._requests_in_process.push(t);var e=this._requests[t].callback();if(this._requests[t]&&(this._requests[t].handler=e,e.timeout===undefined)){var s=this._timeoutCallbackFactory(t);this._requests[t].timeout=window.setTimeout(s,this.options.requestTimeout)}},_timeoutCallbackFactory:function(t){var e=this._requests[t].url;return function(){this.fire("tileerror",{url:e,code:"timeout"}),this._abort_request(t)}.bind(this)},_utfDecode:function(t){return t>=93&&t--,t>=35&&t--,t-32}}),L.utfGrid=function(t,e){return new L.UtfGrid(t,e)}}(window);;
\ No newline at end of file
+!function(window,undefined){L.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(t){throw new Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){4===request.readyState&&(200===request.status?(response=window.JSON?JSON.parse(request.responseText):eval("("+request.responseText+")"),success(response)):0!==request.status&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Evented,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(t,e){L.Util.setOptions(this,e),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=t,this._cache={};for(var s=0;window["lu"+s];)s++;this._windowKey="lu"+s,window[this._windowKey]={};var i=this.options.subdomains;"string"==typeof this.options.subdomains&&(this.options.subdomains=i.split(""))},onAdd:function(t){this._map=t,this._container=this._map._container,this._update();var e=Math.round(this._map.getZoom());e>this.options.maxZoom||e<this.options.minZoom||(t.on("click",this._click,this),t.on("mousemove",this._move,this),t.on("moveend",this._update,this))},onRemove:function(){var t=this._map;t.off("click",this._click,this),t.off("mousemove",this._move,this),t.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(t,e){return this._url=t,e||this.redraw(),this},redraw:function(){this._request_queue=[];for(var t in this._requests)this._requests.hasOwnProperty(t)&&this._abort_request(t);this._cache={},this._update()},_click:function(t){this.fire("click",this._objectForEvent(t))},_move:function(t){var e=this._objectForEvent(t);e.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:t.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),e.data&&(this.fire("mouseover",e),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=e.data):e.data&&this.fire("mousemove",e)},_objectForEvent:function(t){var e=this._map,s=e.project(t.latlng),i=this.options.tileSize,o=this.options.resolution,r=Math.floor(s.x/i),n=Math.floor(s.y/i),u=Math.floor((s.x-r*i)/o),a=Math.floor((s.y-n*i)/o),h=e.options.crs.scale(e.getZoom())/i;r=(r+h)%h,n=(n+h)%h;var _=this._cache[e.getZoom()+"_"+r+"_"+n],c=null;if(_&&_.grid){var l=this._utfDecode(_.grid[a].charCodeAt(u)),d=_.keys[l];_.data.hasOwnProperty(d)&&(c=_.data[d])}return L.extend({latlng:t.latlng,data:c},t)},_update:function(){var t=this._map.getPixelBounds(),e=Math.round(this._map.getZoom()),s=this.options.tileSize;if(!(e>this.options.maxZoom||e<this.options.minZoom)){for(var i=new L.Point(Math.floor(t.min.x/s),Math.floor(t.min.y/s)),o=new L.Point(Math.floor(t.max.x/s),Math.floor(t.max.y/s)),r=this._map.options.crs.scale(e)/s,n=[],u=i.x;u<=o.x;u++)for(var a=i.y;a<=o.y;a++){var h=(u+r)%r,_=(a+r)%r,c=e+"_"+h+"_"+_;n.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(e,h,_):this._loadTile(e,h,_))}for(var l in this._requests)n.indexOf(l)<0&&this._abort_request(l)}},_loadTileP:function(t,e,s){var i=document.getElementsByTagName("head")[0],o=t+"_"+e+"_"+s,r="lu_"+o,n=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s,cb:n+"."+r},this.options)),h=document.createElement("script");h.setAttribute("type","text/javascript"),h.setAttribute("src",a),window[n][r]=function(t){u._cache[o]=t,delete window[n][r],i.removeChild(h),u._finish_request(o)},this._queue_request(o,a,function(){return i.appendChild(h),{abort:function(){i.removeChild(h)}}})},_loadTile:function(t,e,s){var i=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s},this.options)),o=t+"_"+e+"_"+s;this._queue_request(o,i,this._ajaxRequestFactory(o,i))},_ajaxRequestFactory:function(t,e){var s=this._successCallbackFactory(t),i=this._errorCallbackFactory(e);return function(){var t=L.ajax(e,s,i);return t.timeout=this.options.requestTimeout,t}.bind(this)},_successCallbackFactory:function(t){return function(e){this._cache[t]=e,this._finish_request(t)}.bind(this)},_errorCallbackFactory:function(t){return function(e){this.fire("tileerror",{url:t,code:e})}.bind(this)},_queue_request:function(t,e,s){this._requests[t]={callback:s,timeout:null,handler:null,url:e},this._request_queue.push(t),this._process_queued_requests()},_finish_request:function(t){var e=this._requests_in_process.indexOf(t);e>=0&&this._requests_in_process.splice(e,1),e=this._request_queue.indexOf(t),e>=0&&this._request_queue.splice(e,1),this._requests[t]&&(this._requests[t].timeout&&window.clearTimeout(this._requests[t].timeout),delete this._requests[t]),this._process_queued_requests(),0===this._requests_in_process.length&&this.fire("load")},_abort_request:function(t){this._requests[t]&&this._requests[t].handler&&"function"==typeof this._requests[t].handler.abort&&this._requests[t].handler.abort(),null===this._cache[t]&&delete this._cache[t],this._finish_request(t)},_process_queued_requests:function(){for(;this._request_queue.length>0&&(0===this.options.maxRequests||this._requests_in_process.length<this.options.maxRequests);)this._process_request(this._request_queue.pop())},_process_request:function(t){this._requests_in_process.push(t);var e=this._requests[t].callback();if(this._requests[t]&&(this._requests[t].handler=e,e.timeout===undefined)){var s=this._timeoutCallbackFactory(t);this._requests[t].timeout=window.setTimeout(s,this.options.requestTimeout)}},_timeoutCallbackFactory:function(t){var e=this._requests[t].url;return function(){this.fire("tileerror",{url:e,code:"timeout"}),this._abort_request(t)}.bind(this)},_utfDecode:function(t){return t>=93&&t--,t>=35&&t--,t-32}}),L.utfGrid=function(t,e){return new L.UtfGrid(t,e)}}(window);;
\ No newline at end of file
diff --git a/src/leaflet.utfgrid.js b/src/leaflet.utfgrid.js
index eb3ba47..7687258 100644
--- a/src/leaflet.utfgrid.js
+++ b/src/leaflet.utfgrid.js
@@ -34,7 +34,7 @@ L.ajax = function (url, success, error) {
 	return request;
 };
 L.UtfGrid = (L.Layer || L.Class).extend({
-	includes: L.Mixin.Events,
+	includes: L.Evented,
 	options: {
 		subdomains: 'abc',
 

From b9b70250e5fbbddac0fe09a0d38c729b225a47ba Mon Sep 17 00:00:00 2001
From: SergioGutTal <sergio@haystaqdna.com>
Date: Thu, 13 Jul 2017 10:46:57 -0400
Subject: [PATCH 4/4] Bugfix: Failed to execute 'removeChild'

---
 dist/leaflet.utfgrid-src.js | 4 +++-
 dist/leaflet.utfgrid.js     | 2 +-
 src/leaflet.utfgrid.js      | 4 +++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/dist/leaflet.utfgrid-src.js b/dist/leaflet.utfgrid-src.js
index 57e1a21..f17f3ae 100644
--- a/dist/leaflet.utfgrid-src.js
+++ b/dist/leaflet.utfgrid-src.js
@@ -262,7 +262,9 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 		window[wk][functionName] = function (data) {
 			self._cache[key] = data;
 			delete window[wk][functionName];
-			head.removeChild(script);
+			if (script.parentElement===head) {
+				head.removeChild(script);
+			}
 			self._finish_request(key);
 		};
 
diff --git a/dist/leaflet.utfgrid.js b/dist/leaflet.utfgrid.js
index cfb1a8e..71f0f5a 100644
--- a/dist/leaflet.utfgrid.js
+++ b/dist/leaflet.utfgrid.js
@@ -5,4 +5,4 @@
  *
  * @license MIT
  */
-!function(window,undefined){L.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(t){throw new Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){4===request.readyState&&(200===request.status?(response=window.JSON?JSON.parse(request.responseText):eval("("+request.responseText+")"),success(response)):0!==request.status&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Evented,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(t,e){L.Util.setOptions(this,e),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=t,this._cache={};for(var s=0;window["lu"+s];)s++;this._windowKey="lu"+s,window[this._windowKey]={};var i=this.options.subdomains;"string"==typeof this.options.subdomains&&(this.options.subdomains=i.split(""))},onAdd:function(t){this._map=t,this._container=this._map._container,this._update();var e=Math.round(this._map.getZoom());e>this.options.maxZoom||e<this.options.minZoom||(t.on("click",this._click,this),t.on("mousemove",this._move,this),t.on("moveend",this._update,this))},onRemove:function(){var t=this._map;t.off("click",this._click,this),t.off("mousemove",this._move,this),t.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(t,e){return this._url=t,e||this.redraw(),this},redraw:function(){this._request_queue=[];for(var t in this._requests)this._requests.hasOwnProperty(t)&&this._abort_request(t);this._cache={},this._update()},_click:function(t){this.fire("click",this._objectForEvent(t))},_move:function(t){var e=this._objectForEvent(t);e.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:t.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),e.data&&(this.fire("mouseover",e),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=e.data):e.data&&this.fire("mousemove",e)},_objectForEvent:function(t){var e=this._map,s=e.project(t.latlng),i=this.options.tileSize,o=this.options.resolution,r=Math.floor(s.x/i),n=Math.floor(s.y/i),u=Math.floor((s.x-r*i)/o),a=Math.floor((s.y-n*i)/o),h=e.options.crs.scale(e.getZoom())/i;r=(r+h)%h,n=(n+h)%h;var _=this._cache[e.getZoom()+"_"+r+"_"+n],c=null;if(_&&_.grid){var l=this._utfDecode(_.grid[a].charCodeAt(u)),d=_.keys[l];_.data.hasOwnProperty(d)&&(c=_.data[d])}return L.extend({latlng:t.latlng,data:c},t)},_update:function(){var t=this._map.getPixelBounds(),e=Math.round(this._map.getZoom()),s=this.options.tileSize;if(!(e>this.options.maxZoom||e<this.options.minZoom)){for(var i=new L.Point(Math.floor(t.min.x/s),Math.floor(t.min.y/s)),o=new L.Point(Math.floor(t.max.x/s),Math.floor(t.max.y/s)),r=this._map.options.crs.scale(e)/s,n=[],u=i.x;u<=o.x;u++)for(var a=i.y;a<=o.y;a++){var h=(u+r)%r,_=(a+r)%r,c=e+"_"+h+"_"+_;n.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(e,h,_):this._loadTile(e,h,_))}for(var l in this._requests)n.indexOf(l)<0&&this._abort_request(l)}},_loadTileP:function(t,e,s){var i=document.getElementsByTagName("head")[0],o=t+"_"+e+"_"+s,r="lu_"+o,n=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s,cb:n+"."+r},this.options)),h=document.createElement("script");h.setAttribute("type","text/javascript"),h.setAttribute("src",a),window[n][r]=function(t){u._cache[o]=t,delete window[n][r],i.removeChild(h),u._finish_request(o)},this._queue_request(o,a,function(){return i.appendChild(h),{abort:function(){i.removeChild(h)}}})},_loadTile:function(t,e,s){var i=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s},this.options)),o=t+"_"+e+"_"+s;this._queue_request(o,i,this._ajaxRequestFactory(o,i))},_ajaxRequestFactory:function(t,e){var s=this._successCallbackFactory(t),i=this._errorCallbackFactory(e);return function(){var t=L.ajax(e,s,i);return t.timeout=this.options.requestTimeout,t}.bind(this)},_successCallbackFactory:function(t){return function(e){this._cache[t]=e,this._finish_request(t)}.bind(this)},_errorCallbackFactory:function(t){return function(e){this.fire("tileerror",{url:t,code:e})}.bind(this)},_queue_request:function(t,e,s){this._requests[t]={callback:s,timeout:null,handler:null,url:e},this._request_queue.push(t),this._process_queued_requests()},_finish_request:function(t){var e=this._requests_in_process.indexOf(t);e>=0&&this._requests_in_process.splice(e,1),e=this._request_queue.indexOf(t),e>=0&&this._request_queue.splice(e,1),this._requests[t]&&(this._requests[t].timeout&&window.clearTimeout(this._requests[t].timeout),delete this._requests[t]),this._process_queued_requests(),0===this._requests_in_process.length&&this.fire("load")},_abort_request:function(t){this._requests[t]&&this._requests[t].handler&&"function"==typeof this._requests[t].handler.abort&&this._requests[t].handler.abort(),null===this._cache[t]&&delete this._cache[t],this._finish_request(t)},_process_queued_requests:function(){for(;this._request_queue.length>0&&(0===this.options.maxRequests||this._requests_in_process.length<this.options.maxRequests);)this._process_request(this._request_queue.pop())},_process_request:function(t){this._requests_in_process.push(t);var e=this._requests[t].callback();if(this._requests[t]&&(this._requests[t].handler=e,e.timeout===undefined)){var s=this._timeoutCallbackFactory(t);this._requests[t].timeout=window.setTimeout(s,this.options.requestTimeout)}},_timeoutCallbackFactory:function(t){var e=this._requests[t].url;return function(){this.fire("tileerror",{url:e,code:"timeout"}),this._abort_request(t)}.bind(this)},_utfDecode:function(t){return t>=93&&t--,t>=35&&t--,t-32}}),L.utfGrid=function(t,e){return new L.UtfGrid(t,e)}}(window);;
\ No newline at end of file
+!function(window,undefined){L.ajax=function(url,success,error){window.XMLHttpRequest===undefined&&(window.XMLHttpRequest=function(){try{return new ActiveXObject("Microsoft.XMLHTTP")}catch(t){throw new Error("XMLHttpRequest is not supported")}});var response,request=new XMLHttpRequest;return request.open("GET",url),request.onreadystatechange=function(){4===request.readyState&&(200===request.status?(response=window.JSON?JSON.parse(request.responseText):eval("("+request.responseText+")"),success(response)):0!==request.status&&error!==undefined&&error(request.status))},request.ontimeout=function(){error("timeout")},request.send(),request},L.UtfGrid=(L.Layer||L.Class).extend({includes:L.Evented,options:{subdomains:"abc",minZoom:0,maxZoom:18,tileSize:256,resolution:4,useJsonP:!0,pointerCursor:!0,maxRequests:4,requestTimeout:6e4},_mouseOn:null,initialize:function(t,e){L.Util.setOptions(this,e),this._requests={},this._request_queue=[],this._requests_in_process=[],this._url=t,this._cache={};for(var s=0;window["lu"+s];)s++;this._windowKey="lu"+s,window[this._windowKey]={};var i=this.options.subdomains;"string"==typeof this.options.subdomains&&(this.options.subdomains=i.split(""))},onAdd:function(t){this._map=t,this._container=this._map._container,this._update();var e=Math.round(this._map.getZoom());e>this.options.maxZoom||e<this.options.minZoom||(t.on("click",this._click,this),t.on("mousemove",this._move,this),t.on("moveend",this._update,this))},onRemove:function(){var t=this._map;t.off("click",this._click,this),t.off("mousemove",this._move,this),t.off("moveend",this._update,this),this.options.pointerCursor&&(this._container.style.cursor="")},setUrl:function(t,e){return this._url=t,e||this.redraw(),this},redraw:function(){this._request_queue=[];for(var t in this._requests)this._requests.hasOwnProperty(t)&&this._abort_request(t);this._cache={},this._update()},_click:function(t){this.fire("click",this._objectForEvent(t))},_move:function(t){var e=this._objectForEvent(t);e.data!==this._mouseOn?(this._mouseOn&&(this.fire("mouseout",{latlng:t.latlng,data:this._mouseOn}),this.options.pointerCursor&&(this._container.style.cursor="")),e.data&&(this.fire("mouseover",e),this.options.pointerCursor&&(this._container.style.cursor="pointer")),this._mouseOn=e.data):e.data&&this.fire("mousemove",e)},_objectForEvent:function(t){var e=this._map,s=e.project(t.latlng),i=this.options.tileSize,o=this.options.resolution,r=Math.floor(s.x/i),n=Math.floor(s.y/i),u=Math.floor((s.x-r*i)/o),a=Math.floor((s.y-n*i)/o),h=e.options.crs.scale(e.getZoom())/i;r=(r+h)%h,n=(n+h)%h;var _=this._cache[e.getZoom()+"_"+r+"_"+n],c=null;if(_&&_.grid){var l=this._utfDecode(_.grid[a].charCodeAt(u)),d=_.keys[l];_.data.hasOwnProperty(d)&&(c=_.data[d])}return L.extend({latlng:t.latlng,data:c},t)},_update:function(){var t=this._map.getPixelBounds(),e=Math.round(this._map.getZoom()),s=this.options.tileSize;if(!(e>this.options.maxZoom||e<this.options.minZoom)){for(var i=new L.Point(Math.floor(t.min.x/s),Math.floor(t.min.y/s)),o=new L.Point(Math.floor(t.max.x/s),Math.floor(t.max.y/s)),r=this._map.options.crs.scale(e)/s,n=[],u=i.x;u<=o.x;u++)for(var a=i.y;a<=o.y;a++){var h=(u+r)%r,_=(a+r)%r,c=e+"_"+h+"_"+_;n.push(c),this._cache.hasOwnProperty(c)||(this._cache[c]=null,this.options.useJsonP?this._loadTileP(e,h,_):this._loadTile(e,h,_))}for(var l in this._requests)n.indexOf(l)<0&&this._abort_request(l)}},_loadTileP:function(t,e,s){var i=document.getElementsByTagName("head")[0],o=t+"_"+e+"_"+s,r="lu_"+o,n=this._windowKey,u=this,a=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s,cb:n+"."+r},this.options)),h=document.createElement("script");h.setAttribute("type","text/javascript"),h.setAttribute("src",a),window[n][r]=function(t){u._cache[o]=t,delete window[n][r],h.parentElement===i&&i.removeChild(h),u._finish_request(o)},this._queue_request(o,a,function(){return i.appendChild(h),{abort:function(){i.removeChild(h)}}})},_loadTile:function(t,e,s){var i=L.Util.template(this._url,L.Util.extend({s:L.TileLayer.prototype._getSubdomain.call(this,{x:e,y:s}),z:t,x:e,y:s},this.options)),o=t+"_"+e+"_"+s;this._queue_request(o,i,this._ajaxRequestFactory(o,i))},_ajaxRequestFactory:function(t,e){var s=this._successCallbackFactory(t),i=this._errorCallbackFactory(e);return function(){var t=L.ajax(e,s,i);return t.timeout=this.options.requestTimeout,t}.bind(this)},_successCallbackFactory:function(t){return function(e){this._cache[t]=e,this._finish_request(t)}.bind(this)},_errorCallbackFactory:function(t){return function(e){this.fire("tileerror",{url:t,code:e})}.bind(this)},_queue_request:function(t,e,s){this._requests[t]={callback:s,timeout:null,handler:null,url:e},this._request_queue.push(t),this._process_queued_requests()},_finish_request:function(t){var e=this._requests_in_process.indexOf(t);e>=0&&this._requests_in_process.splice(e,1),e=this._request_queue.indexOf(t),e>=0&&this._request_queue.splice(e,1),this._requests[t]&&(this._requests[t].timeout&&window.clearTimeout(this._requests[t].timeout),delete this._requests[t]),this._process_queued_requests(),0===this._requests_in_process.length&&this.fire("load")},_abort_request:function(t){this._requests[t]&&this._requests[t].handler&&"function"==typeof this._requests[t].handler.abort&&this._requests[t].handler.abort(),null===this._cache[t]&&delete this._cache[t],this._finish_request(t)},_process_queued_requests:function(){for(;this._request_queue.length>0&&(0===this.options.maxRequests||this._requests_in_process.length<this.options.maxRequests);)this._process_request(this._request_queue.pop())},_process_request:function(t){this._requests_in_process.push(t);var e=this._requests[t].callback();if(this._requests[t]&&(this._requests[t].handler=e,e.timeout===undefined)){var s=this._timeoutCallbackFactory(t);this._requests[t].timeout=window.setTimeout(s,this.options.requestTimeout)}},_timeoutCallbackFactory:function(t){var e=this._requests[t].url;return function(){this.fire("tileerror",{url:e,code:"timeout"}),this._abort_request(t)}.bind(this)},_utfDecode:function(t){return t>=93&&t--,t>=35&&t--,t-32}}),L.utfGrid=function(t,e){return new L.UtfGrid(t,e)}}(window);;
\ No newline at end of file
diff --git a/src/leaflet.utfgrid.js b/src/leaflet.utfgrid.js
index 7687258..9a11468 100644
--- a/src/leaflet.utfgrid.js
+++ b/src/leaflet.utfgrid.js
@@ -253,7 +253,9 @@ L.UtfGrid = (L.Layer || L.Class).extend({
 		window[wk][functionName] = function (data) {
 			self._cache[key] = data;
 			delete window[wk][functionName];
-			head.removeChild(script);
+			if (script.parentElement===head) {
+				head.removeChild(script);
+			}
 			self._finish_request(key);
 		};