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  1. #1
    SitePoint Member
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    xmlHttp.responseText return empty

    Code:
    function GetXmlHttpObject()
    {
    	var xmlHttp=null;
    	try
    	  {	
    	  // Firefox, Opera 8.0+, Safari
    	  xmlHttp=new XMLHttpRequest();
    	  }
    	catch (e)
    	  {
    	  // Internet Explorer
    	  try
    	    {
    	    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    	    
    	    }
    	  catch (e)
    	    {
    	    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    	    }
    	  }
    	return xmlHttp;
    }
    Code:
                    xmlHttp = new GetXmlHttpObject();
    		
    		var url="./scripts/phpAjaxFunction.php";					
    		var params = "action=downloadFileToUnix";		
    	
    		xmlHttp.open("POST", url, true);
    
    		//Send the proper header information along with the request
    		xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    		xmlHttp.setRequestHeader("Content-length", params.length);
    		xmlHttp.setRequestHeader("Connection", "close");
    
    		xmlHttp.onreadystatechange = function() {//Call a function when the state changes.
    			if(xmlHttp.readyState == 4 && xmlHttp.status == 200) { 
    			
    				alert(trim(xmlHttp.responseText));
    				
    			}
    		}
    		xmlHttp.send(params);
    xmlHttp.responseText always return empty, can anyone help?
    thanks in advance

  2. #2
    Gre aus'm Pott gold trophysilver trophybronze trophy
    Pullo's Avatar
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    Hi,

    The first thing I would do is to check in your browser's console to see if there are any error messages being reported.
    How do I do that?

  3. #3
    Community Advisor bronze trophy
    fretburner's Avatar
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    Hi Isy,

    Another thing to check - is your server-side script setup to check if the request was made via AJAX? Many JS libraries set the 'x-requested-with' header, so you could try setting this:
    Code JavaScript:
    xmlHttp.setRequestHeader("X-Requested-With", "XMLHttpRequest");

  4. #4
    SitePoint Member
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    after adding
    Code:
    xmlHttp.setRequestHeader("X-Requested-With", "XMLHttpRequest");
    xmlHttp.responseText still return empty.

  5. #5
    Programming Since 1978 silver trophybronze trophy felgall's Avatar
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    What is ./scripts/phpAjaxFunction.php echoing out if you access it directly rather than vis JavaScript?
    Stephen J Chapman

    javascriptexample.net, Book Reviews, follow me on Twitter
    HTML Help, CSS Help, JavaScript Help, PHP/mySQL Help, blog
    <input name="html5" type="text" required pattern="^$">

  6. #6
    SitePoint Member
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    Quote Originally Posted by felgall View Post
    What is ./scripts/phpAjaxFunction.php echoing out if you access it directly rather than vis JavaScript?
    what do u means for echoing out?

  7. #7
    Programming Team silver trophybronze trophy
    Mittineague's Avatar
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    I think what he means is if you go to
    ./scripts/phpAjaxFunction.php
    in your browser, what output do you see? (including both rendered and view-source)

    *hint - AJAX makes an HTTP request as does a browser

  8. #8
    SitePoint Member
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    Quote Originally Posted by Mittineague View Post
    I think what he means is if you go to
    ./scripts/phpAjaxFunction.php
    in your browser, what output do you see? (including both rendered and view-source)

    *hint - AJAX makes an HTTP request as does a browser
    i can see all the function in ./scripts/phpAjaxFunction.php is executing completely, but still responseText is return empty
    is there anyway to debug it?


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