1. GWT
developing web applications
with java(script)
Ewa Maciaś, emacias@google.com, 18-04-
2012 Kraków

3. var jstiming = parent.jstiming;
function click(m) {
jstiming && jstiming.load.tick(m);
}
function _B_prog(pct) {
if (parent['OZ_prog'] !== undefined) {
parent['OZ_prog'] = pct;
}
}

4. {} + [] = ?
empty object + empty array = ?

5. {}
empty object

6. []
empty array

7. 0
zero

11. AJAX

12. function ajaxFunction(){
var xmlHttp;
try{
// Creating XMLHttpRequest object (Gecko engine, WebKit, Presto, Trident w IE>6)
xmlHttp=new XMLHttpRequest();
} catch(e) {
// Catches exception if JavaScript does not have XMLHttpRequest
try {
// Creating ActiveXObject object, for ActiveX IE console
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try {
// Creating ActiveXObject object, other versions of IE
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
// Show an error on case of support for XMLHttpRequest
alert("Your browser does not support AJAX!");
return false;
}
}
}
return xmlHttp;
}

13. package com.example.foo.client;
import com.google.gwt.user.client.rpc.RemoteService;
public interface MyService extends RemoteService {
public String myMethod(String s);
}