Ajax functionality - XMLHttpRequest

[Hardik Raja]

Hello JavaRanchers,

The function below is a javascript function that has AJAX code to request and recieve data from a servlet.

1 function xmlhttpPost(strURL) {
2        var xmlHttpReq = false;
3         var self = this;
4          // Mozilla/Safari
5          if (window.XMLHttpRequest) {
6              self.xmlHttpReq = new XMLHttpRequest();
7          }
8          // IE
9          else if (window.ActiveXObject) {
10              self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
11         }
12          self.xmlHttpReq.open('GET', strURL, true);
13          self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
14          self.xmlHttpReq.onreadystatechange = function() {
15              if (self.xmlHttpReq.readyState == 4) { //ready state 4 means its complete.
16              if(self.xmlHttpReq.status==200){
17      processResponse();
18    }
19              }
20          }
21          self.xmlHttpReq.send();
22          
23          setTimeout("xmlhttpPost('ordercheck')", 10000);
24      }

Questions:

1.The above code works in firefox version 2.0.0.1.4 but not in Internet Explorer 7(Just displays a blank page). Any input on this ?

2.As I said earlier, this code works in firefox version 2.0.0.1.4 but it gives me the below error when it works on firefox version 3.0.1. I traced this error through firebug( an addon in firefox ) and it shows the below error on line 20,

uncaught exception: [Exception... "Not enough arguments [nsIXMLHttpRequest.send]" nsresult: "0x80570001 (NS_ERROR_XPC_NOT_ENOUGH_ARGS)" location: "JS frame :: http://localhost:8080/Iward/login :: xmlhttpPost :: line 20" data: no]

Line 0

Based on this error, I checked my javascript function code, but i am not able to understand whats wrong with it.

Could anyone please provide thier input on it ?

Thanks,
Hardik Raja
SCJP 5.0
[ August 18, 2008: Message edited by: Hardik Raja ]

[Bear Bibeault]

Try send(null) or send ('').

[Bear Bibeault]

Or better yet, follow the advice of the more experienced Ajax developers and adopt a library to handle all the intricacies and cross-browser nuances of Ajax for you. I highly recommend one of Prototype or jQuery. jQuery has the most painless Ajax integration, in my opinion.

[Hardik Raja]

Dear Bear Bibeault,

Using send(null) doesn't display the error, I had mentioned earlier and thanks for you input on using jquery. Thank You.

Regards,
Hardik