added support to load from file

src/litegraph.js

@@ -2117,8 +2117,25 @@
         return error;
     };
 
-    LGraph.prototype.load = function(url) {
+    LGraph.prototype.load = function(url, callback) {
         var that = this;
+
+		//from file
+		if(url.constructor === File || url.constructor === Blob)
+		{
+			var reader = new FileReader();
+			reader.addEventListener('load', function(event) {
+				var data = JSON.parse(event.target.result);
+				that.configure(data);
+				if(callback)
+					callback();
+			});
+			
+			reader.readAsText(url);
+			return;
+		}
+
+		//is a string, then an URL
         var req = new XMLHttpRequest();
         req.open("GET", url, true);
         req.send(null);
@@ -2127,8 +2144,10 @@
                 console.error("Error loading graph:", req.status, req.response);
                 return;
             }
-            var data = JSON.parse(req.response);
+            var data = JSON.parse( req.response );
             that.configure(data);
+			if(callback)
+				callback();
         };
         req.onerror = function(err) {
             console.error("Error loading graph:", err);
@@ -10773,9 +10792,9 @@ LGraphNode.prototype.executeAction = function(action)
                     callback: LGraphCanvas.onMenuNodeMode
                 },
                 {
-                    content: "Resize", callback: () => {
+                    content: "Resize", callback: function() {
                         if(node.resizable) 
-                            LGraphCanvas.onResizeNode
+                            return LGraphCanvas.onResizeNode;
                     }
                 },
                 {