[SOLVED] Can't get Ajax working - help

Question

I am trying to set Ajax up for a media server (hosting professor lectures).
I am trying to update my mysql, if someone likes a particular lecture.
However, I am not able to get any response what so ever. I am using an onclick - however, nothing happens. Check the code below - I have set up an if-else, with onreadyState, and for both the conditions (exhaustive), no change happens. Please suggest what I am doing wrong.
function show_jw()
var filepath=jwplayer('container').getPlaylistItem().file;
var xmlhttp;
xmlhttp.onreadystatechange=function()
if (xmlhttp.readyState==4 && xmlhttp.status==200)
document.getElementById("like").innerHTML="file found";
else
document.getElementById("like").innerHTML="file not found";
xmlhttp.open("GET","ajaxphp.php?f="+filepath,true);
xmlhttp.send();
</script>
<input type="button" onclick=show_jw() value="like" />
on clicking the button, I should either see "file found" or "file not found". I see nothing (on chrome or firefox).
Last edited by devadittya (2012-01-22 18:33:24)

Answer 1

Also note that the else statement gets executed even if readyState != 4 which is probably not what you want. Better to implement it as:
xmlhttp.onreadystatechange=function()
if (xmlhttp.readyState==4)
if (xmlhttp.status==200)
document.getElementById("like").innerHTML="file found";
else
document.getElementById("like").innerHTML="file not found";
More info here: http://www.w3.org/TR/2012/WD-XMLHttpReq … readystate. The entire page is a good read actually.
Last edited by iTwenty (2012-01-23 17:17:24)