Status code 0

@LeanderMay 10.2011

Hi,

I’m trying to get some data through a PHP file in AJAX. It works
really fine, but only on Desktop. When i go mobile (iPhone 4, Android)
it doesnt work. I’ve got a status = 0 back and my responseText is
empty.

It goes about the following code (with a callback).

[CODE]function loadXML(method, url, onsuccess) {

var xmlhttp;

if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest(); } else { // code for IE6, IE5 xmlhttp = new ActiveXObject(“Microsoft.XMLHTTP”); }

xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { onsuccess(xmlhttp.responseText); }

if(xmlhttp.readyState == 4 && xmlhttp.status == 0) { onsuccess(xmlhttp.responseText); } }

xmlhttp.open(method, url, true); xmlhttp.send(null);

}

function initialize() {

loadXML(“GET”, “http://example.com/testing.php”, function(location) { //Here is the variabele location empty (only on Android/iPhone). }); }[/CODE]

When i test my script on a browser, it gives me the right data back.
On Android/iPhone, it gives nothing back. Knows anybody the problem
and how i can solved it?

to post a comment

JavaScript

12 Comments(s) _↴

@KorMay 10.2011 — #There something wrong within this part. There's a mess:

<i>
 </i>function initialize() {
 
 <i>    </i>                            loadXML("GET", "http://example.com/testing.php",
 function(location) {
 //Here is the variabele
 location empty (only on Android/iPhone).
 });
 }

It is not very clear where the functions start and end...

@LeanderauthorMay 10.2011 — #Maybe this version is better?

[CODE]
 function loadXML(method, url, onsuccess)
 {
 var xmlhttp;
 if (window.XMLHttpRequest)
 { // code for IE7+, Firefox, Chrome, Opera, Safari
 xmlhttp = new XMLHttpRequest();
 }
 else
 { // code for IE6, IE5
 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 
   xmlhttp.onreadystatechange = function()
   {
   if (xmlhttp.readyState == 4  && xmlhttp.status == 200) {
   onsuccess(xmlhttp.responseText);
   }
 
   if(xmlhttp.readyState == 4  && xmlhttp.status == 0)
   {
   onsuccess(xmlhttp.responseText);
   }
   }
 
   xmlhttp.open(method, url, true);
   xmlhttp.send(null);
 
 }
 
 function initialize() {
 loadXML("GET", "http://example.com/testing.php", function(location) {
 //Here is the variabele location empty (only on Android/iPhone).
 });
 }
 [/CODE]

@KorMay 10.2011 — #Why so intricate? Wouldn't be easier something like this:

<i>
 </i>function loadXML(method, url){
 //...
 if (xmlhttp.readyState == 4  &amp;&amp; xmlhttp.status == 200) {
 return xmlhttp.responseText);
 }
 //...
 }
 
 function initialize() {
 var location= loadXML("GET", "http://example.com/testing.php");
 // do whichever with location
 }

@LeanderauthorMay 10.2011 — #Because of this function:

[CODE]
 [U]xmlhttp.onreadystatechange = function()[/U]
 {
 if (xmlhttp.readyState == 4  && xmlhttp.status == 200) {
 onsuccess(xmlhttp.responseText);
 }
 
   if(xmlhttp.readyState == 4  && xmlhttp.status == 0)
   {
   onsuccess(xmlhttp.responseText);
   }
   }
 [/CODE]

If i do a return, it would never come out the xmlhttp.onreadystatechange? That's why i'm using a callback function.

@KorMay 10.2011 — #status ==0? that means you are ready to work locally, if it is the case? If so, have you tried that?:

<i>
 </i>xmlhttp.onreadystatechange = function()
 {
 if (xmlhttp.readyState == 4  &amp;&amp; (xmlhttp.status == 200||xmlhttp.status == 0)) {
 onsuccess(xmlhttp.responseText);
 }
 
 <i>    </i>      }

@LeanderauthorMay 10.2011 — #Yes, i have tried that!

The only problem is that i'm not working locally. I get that status code on my Android phone / iPhone 4.0.

And if i do that. The xmlhttp.responseText is empty on my Android / iPhone 4.0

Do you know what's wrong with it? I have searched already the whole web.

@KorMay 10.2011 — #Is it the [B]url[/B] written correct? If you write it as an absolute URL (like http://www.etc) it won't work. Is it a relative path there?

@LeanderauthorMay 10.2011 — #Thx, the problem has been solved!

@KorMay 10.2011 — #Thx, the problem has been solved![/QUOTE]
And the reason was? Please share the solution with us. To make us avoid a possible error, for the future ?

@LeanderauthorMay 10.2011 — #Is it the [B]url[/B] written correct? If you write it as an absolute URL (like http://www.etc) it won't work. Is it a relative path there?[/QUOTE]

That was the solution ? Thx!

@KorMay 10.2011 — #OK. The reason is simple: servers do often presume that a request to an absolute URL is a request to [I]another domain[/I], which is impossible without using a third, server-side, code (a proxy). the response [B]status=0[/B] usually cover that case.

@saykul_90Jan 16.2013 — #would u plz specify wat relative link means?

i have specified the url as http://ip address:portno/the web service name

the web service is located on anoder machine so i have to specify the ip address

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