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status 0 and textResponse empty in XMLHttpRequest

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  status  0 and textResponse empty in  XMLHttpRequest irshadjd <mohdirshadmi4@gmail.com> - 2013-10-14 04:05 -0700
    Re: status  0 and textResponse empty in  XMLHttpRequest Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-10-14 13:28 +0200
    Re: status  0 and textResponse empty in  XMLHttpRequest Hans-Georg Michna <hans-georgNoEmailPlease@michna.com> - 2013-10-14 16:04 +0200
    Re: status  0 and textResponse empty in  XMLHttpRequest Danny <dann90038@gmail.com> - 2013-10-14 10:32 -0700
      Re: status  0 and textResponse empty in  XMLHttpRequest JJ <duh@nah.meh> - 2013-10-15 15:44 +0700
        Re: status  0 and textResponse empty in  XMLHttpRequest dhtml <dhtmlkitchen@gmail.com> - 2013-10-16 09:47 -0700

#21605 — status 0 and textResponse empty in XMLHttpRequest

Hello friends,

every time i am getting Text Response empty in any browser
any one could help me


var url = "http://www.youtube.com/"; 
var xmlhttp = new XMLHttpRequest(); 

xmlhttp.open("GET", url);
xmlhttp.setRequestHeader("User-Agent",navigator.userAgent);
 // subscribe to this event before you send your request.
 xmlhttp.onreadystatechange=function() {
  alert(xmlhttp.status);
  if (xmlhttp.readyState==4 ) {
   //alert the user that a response now exists in the responseTest property.
   alert(xmlhttp.responseText);
  
   // And to view in firebug
   console.log('xhr',xmlhttp)
  }
 }
xmlhttp.send()

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#21606

irshadjd wrote:

> every time i am getting Text Response empty in any browser
> any one could help me

<http://PointedEars.de/faq#javascriptErrors>

> var url = "http://www.youtube.com/";
> var xmlhttp = new XMLHttpRequest();
> 
> xmlhttp.open("GET", url);
> xmlhttp.setRequestHeader("User-Agent",navigator.userAgent);

| Refused to set unsafe header "User-Agent"

>  // subscribe to this event before you send your request.
>  xmlhttp.onreadystatechange=function() {
>   alert(xmlhttp.status);

You should be using console.log() here as well, because alert() blocks 
execution.

The fact that you are only seeing this one time, and that it displays 0 
means that the readyState never changes from 0 to 1.  IOW, the request is 
not even made.

>   if (xmlhttp.readyState==4 ) {
>    //alert the user that a response now exists in the responseTest
>    property. alert(xmlhttp.responseText);

See above.  And keep your posted lines to 78 characters at maximum (to allow 
for one quotation level; less for more).  The source code alternative (that 
I recommmend) is to use *multi-line* comments for documentation and write 
semicolons *always*.  That way code will continue to work even if wrapped.

Not using the borken and spammed Google Groups Web interface is helping with 
that.
   
>    // And to view in firebug
>    console.log('xhr',xmlhttp)
>   }
>  }
> xmlhttp.send()

| XMLHttpRequest cannot load http://www.youtube.com/. Origin
| […] is not allowed by Access-Control-Allow-Origin.

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.

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#21607

On Mon, 14 Oct 2013 04:05:32 -0700 (PDT), irshadjd wrote:

>every time i am getting Text Response empty in any browser
>any one could help me

Check http://winhlp.com/node/684 for fully functional Ajax
sample code.

Hans-Georg

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#21608

To irshadjd


from the code above, I don't see anything wrong, it'd be nicer if we could look at the working page so we could probe the actual code.

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#21612

On Mon, 14 Oct 2013 10:32:48 -0700 (PDT), Danny wrote:
> To irshadjd
> 
> from the code above, I don't see anything wrong, it'd be nicer if we could
> look at the working page so we could probe the actual code.

I think he's violating cross-domain policy.

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#21625

On Tuesday, October 15, 2013 1:44:08 AM UTC-7, JJ wrote:
> On Mon, 14 Oct 2013 10:32:48 -0700 (PDT), Danny wrote:
> 
> > To irshadjd
> 
> > 
> 
> > from the code above, I don't see anything wrong, it'd be nicer if we could
> 
> > look at the working page so we could probe the actual code.
> 
> 
> 
> I think he's violating cross-domain policy.
Yeah. Possibly making a request from local file protocol (not a domain).

That's why Thomas mentioned about Access-Control-Allow-Origin. For that resource to be loaded by any different origin domain that page, youtube.com would need to respond with

 Access-Control-Allow-Origin: *

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