Xmlhttp In Loop Not Totally Working
Dec 9, 2004
I have a javascript that is supposed to read a text file (a log from a php script) and it should be shown in a html page. Even more, it should read that txt file again every 10 seconds and update the result every time on the page.
I use xmlhttp for this, after a suggestion from someone on this forum. My script is working well, but only the first time the page is loaded. From then on it becomes unrelieable and I dont know why.
This is the first part: loading a function in the body tag, and a browser version check, I dont think there is any problem in this.
Code:
<body onLoad="showbuffer();">
<script language="JavaScript">
<!--
var xmlhttp=false;
/*@cc_on @*/
/*@if (@_jscript_version >= 5)
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
xmlhttp = false;
}
}
@end @*/
if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
xmlhttp = new XMLHttpRequest();
}
//-->
</script>
This is the second part, a self made looping function that looks up buffer.txt , and writes it on the page.
Code:
<script language="JavaScript">
<!--
function showbuffer() {
xmlhttp.open("GET", "buffer.txt",true);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
buffertext=xmlhttp.responseText;
document.body.innerHTML= buffertext;
}
}
xmlhttp.send(null)
return false;
setTimeout('showbuffer()', 10000);
}
//-->
</script>
And this works, if I load my page then it shows exactly the content of buffer.txt . And if a bit later some data is added to the txt file, then it doesnt show up in the xmlhttp page , its still the same content as from the beginning so it didnt update. But there is something really weird about it, if I open up a second browser window and typ in the complete url of the buffer.txt file, and visit that page and look at the new data... then within 10 seconds the new part is added to the xmlhttp page. So the javascript function doesnt work, unless I refresh the page it is supposed to read. I've tried to mimic that, with a php script in crontab that would read buffer.txt through file(); or fopen(); every minute , but that didnt seem to work.
I dont think there is anything wrong with all the xmlhttp part of it, but rather with the way I try to integrate it into a loop. But this setup with setTimeout is the only way I know to make a function repeat itself with a few seconds delay after every step.
So, could anyone please point out how this could be solved ? Maybe another way to loop the xmlhttp part perhaps?
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