File open operations can now be cancelled

index.html

@@ -126,8 +126,10 @@
 				box-sizing: border-box;
 			}
 			#loaderProgress p {
+				color: #999;
+				font-size: 12px;
 				padding: 0px;
-				margin: 0px;
+				margin: 5px 0px 0px 0px;
 			}
 
 			#loaderProgress .progress {
@@ -348,6 +350,7 @@ <h5>Set the load density. Smaller values load and display faster.
 							<div id="loadFidelity"></div>
 						</div>
 						<div id="loaderProgress">
+							<button style="margin-left: 10px;" type="button" class="close">&times;</button>
 							<div class="progress">
 								<div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="20"
 									aria-valuemin="0" aria-valuemax="100" style="width: 20%;">

js/laslaz.js

@@ -82,14 +82,14 @@
 	scope.handleMessage = function(message_event) {
 		var msg = message_event.data;
 		var resolver = waitHandlers[msg.id];
+		delete waitHandlers[msg.id];
 
 		// call the callback in a separate context, make sure we've cleaned our
 		// state out before the callback is invoked since it may queue more doExchanges
 		setTimeout(function() { 
 			if (msg.error)
 				return resolver.reject(new Error(msg.message || "Unknown Error"));
 
-
 			if (msg.hasOwnProperty('count') && msg.hasOwnProperty('hasMoreData')) {
 				return resolver.resolve({
 					buffer: msg.result,
@@ -110,7 +110,7 @@
 
 		nacl_module.postMessage(cmd);
 
-		return resolver.promise;
+		return resolver.promise.cancellable();
 	};
 
 	// LAS Loader