Avoid initial callback dispatch

Only execute callback if message timestamp is newer than lastMessage
timestamp. This shall fix #17

Author: CodingCarlos

demo/index.html

@@ -64,17 +64,17 @@ <h1>User side support</h1>
 			defaultSupportPic: 'http://lorempixel.com/100/100/people',
 			onMessage: myFunction,
 			onSend: function(msg, key) {
-				console.log('Sent message. Id stored: ' + key);
+				console.log('#################');
+				console.log('- Message sent! Key: ' + key);
 				console.log(msg)
+				console.log('#################');
 			}
 		});
 
 		function myFunction(message, key) {
 			console.log('--------------------');
-			console.log('- We got a message!');
+			console.log('- We got a message! key: ' + key);
 			console.log(message);
-			console.log('- key:');
-			console.log(key);
 			console.log('--------------------');
 		}
 	};

dist/chat.js

@@ -333,7 +333,7 @@ function IASChat(config) {
 
 		if(message.uid == uid) {
 			printMessage(text);
-			if(typeof onSend === 'function') {
+			if(typeof onSend === 'function' && message.timestamp > lastMessage.timestamp) {
 				onSend(message, key);
 			}
 		} else {
@@ -344,7 +344,7 @@ function IASChat(config) {
 				readLastMessage();
 			}
 
-			if(typeof onMessage === 'function') {
+			if(typeof onMessage === 'function' && message.timestamp > lastMessage.timestamp) {
 				onMessage(message, key);
 			}
 		}

js/chat.js

@@ -333,7 +333,7 @@ function IASChat(config) {
 
 		if(message.uid == uid) {
 			printMessage(text);
-			if(typeof onSend === 'function') {
+			if(typeof onSend === 'function' && message.timestamp > lastMessage.timestamp) {
 				onSend(message, key);
 			}
 		} else {
@@ -344,7 +344,7 @@ function IASChat(config) {
 				readLastMessage();
 			}
 
-			if(typeof onMessage === 'function') {
+			if(typeof onMessage === 'function' && message.timestamp > lastMessage.timestamp) {
 				onMessage(message, key);
 			}
 		}