add example callback func

Author: hassandraga

examples/index.html

@@ -78,21 +78,28 @@
 </div>
   </body>
 
-	<!-- WebUI Core -->
-	<script type="text/javascript">
-		document.addEventListener('DOMContentLoaded', function(event) {
-			if (typeof _webui_ws === 'undefined'){
-				let webui_searchParams = new URLSearchParams(window.location.search);
-				if(webui_searchParams.has('webui')){
-					let webui_url = webui_searchParams.get('webui');
-					var webui_elem = document.createElement("script");
-					webui_elem.type = "text/javascript";
-					webui_elem.src = webui_url;
-					document.getElementsByTagName('head')[0].appendChild(webui_elem);
-				}
-				else alert('Failed to get the WebUI Core link.');
-			}
-		})
-	</script>
+    <!-- WebUI Core ---------------------------------------------------->
+    <script type="text/javascript">
+      document.addEventListener("DOMContentLoaded", function (event) {
+	if (typeof _webui_ws === "undefined") {
+	  let webui_searchParams = new URLSearchParams(window.location.search);
+	  if (webui_searchParams.has("webui")) {
+	    let webui_url = webui_searchParams.get("webui");
+	    var webui_elem = document.createElement("script");
+	    webui_elem.async = true;
+	    webui_elem.type = "text/javascript";
+	    webui_elem.src = webui_url;
+	    document.body.appendChild(webui_elem);
+	  } else alert("Failed to get the WebUI Core link.");
+	}
+      });
+      // Callbacks
+      function webui_ready() {
+
+	// WebUI is ready
+	webui_debug(false);
+      }
+    </script>
+    <!-- ------------------------------------------------------------ -->
 
 </html>