The basics of Dojo (ii) read data from the server _dojo

This example follows the content of the "Dojo Basics"
First, we create a new file in the same level directory in helloworld.html, named response.txt,内容为:

Welcome to the Dojo Hello world Tutorial

Replace the code for section 2 with the following code

 
 <!--section 3 
 <script type= "Text/javascript" 
 Dojo.require ("dojo.io.*"); 
 Dojo.require ("dojo.event.*"); 
 Dojo.require ("dojo.widget.*"); 
 Dojo.require ("Dojo.widget.Button"); The 
 
//binding URL path. Of course, when the button is pressed, the request is sent to the Response.txt, at which point the server 
//will return the content in Response.txt. This URL can be another object. Like the 
//*** in struts . Do or is a servlet URL. 
 Function hellopressed () 
 {
 Dojo.io.bind ({
 URL: ' response.txt ', 
 Handler:h Ellocallback 
}); 
} 
 
//process functions that return data. The three parameters are  required . 
 Function Hellocallback (type, data, evt) 
 {
 if (type = = ' ERROR ' 
 Alert (' Error when retrieving data ' server! ');   
 Else 
 Alert (data); 
    
 
 Function init () 
 {
 var Hellobutton = dojo.widget.byId (' Hellobutton '); 
  Dojo.event.connect (Hellobutton, ' OnClick ', ' hellopressed ') 
} 
 
 Dojo.addonload (init); 
 </script> 
 

The above is all code.