Ajax to read updated values from XML
- by punit
I am creating file upload progress bar. I have a CGI script which copies the data, and here I increment the progress bar value by ONE after certain iterations. I am storing the incremented value in XML file (I also tried using plain text file). On the other side I have ajax reading incremented value from xml and depending on that it increments the DIV element.
However, what happens here is, it seems to me that although the ajax reads all the incremented values but it processes it after the CGI has finished execution. That is progress bar starts execution once the file copying and other stuff in CGI is completed. My code is:
AJAX::::
function polling_start() { //GETS CALLED WHEN USER HITS FILE UPLOAD BUTTON
intervalID = window.setInterval(send_request,100);
}
window.onload = function (){
request = initXMLHttpClient();
request.overrideMimeType('text/xml');
progress = document.getElementById('progress');
}
function initXMLHttpClient() {
if (window.XMLHttpRequest){
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else{
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlhttp
}
function send_request()
{
request.open("GET","progress_bar.xml",true);
request.onreadystatechange = request_handler;
request.send();
}
function request_handler()
{
if (request.readyState == 4 && request.status == 200)
{
var level=request.responseXML.getElementsByTagName('PROGRESS')[0].firstChild;
progress.style.width = progress.innerHTML = level.nodeValue + '%';
progress.style.backgroundColor = "green";
}
}
/****ON SERVER SIDE*********/
char xmlDat1[] = "<DOCUMENT><PROGRESS>";
char xmlDat2[] = "</PROGRESS></DOCUMENT>";
fptr = fopen("progress_bar.xml", "w");
.........OTHER STUFF..............................
.................................
if(i == inc && j<=100)
{
fprintf(fptr, "%s\n", "\n\n\n]");
//fprintf(fptr, "%s\n", "");
fprintf(fptr, "%s", xmlDat1); //
fprintf(fptr, "%d" ,j);
fprintf(fptr, "%s" ,xmlDat2);
fseek(fptr, 0, SEEK_SET);
/*fprintf(fptr, "%d" ,j);
fseek(fptr, 0, SEEK_SET);*/
i = 0;
//sleep(1);
j++;
}
(I also tried to write in .text, but same response)
Any quick response would be appreciable.
