Some help? AJAX

sei046

Anyone see why this wont update the value beyond 222. If so why not?

function xGetElementById(e)
{
if(typeof(e)=='string') {
if(document.getElementById) e=document.getElementById(e);
else if(document.all) e=document.all[e];
else e=null;
}
return e;
}
var my_embedded_data_1 = 222;
var my_embedded_data_2 = 333;

var XHR = new xHttpRequest();


function onResponse(req, status, obj)
{




try {
eval(req.responseText);

}
catch(e) {
}

xGetElementById('my_html_data').innerHTML = my_embedded_data_1;

setTimeout("issueRequest()", 2000);
}

function issueRequest()
{
XHR.send('GET', 'd.stm', 't=' + new Date().getTime(), 7000, false, false, null, onResponse);
}

window.onload = function()
{
issueRequest();
}
</script>
</head>


<div id="my_html_data"><div>

Sparks

Um, silly question as my javascript-fu is weak, but where do you ever touch the value other than in the initial decleration in onResponse()? I don't see any increment operations there at all.

ron_darrell

xGetElementById('my_html_data').innerHTML = my_embedded_data_1;

You only ever look for the value 222 (i.e. my_embedded_data_1) so you'll only ever get back 222.

What exactly is it that you want this code to do and maybe we can point you in the right direction?

sei046

Hey guys, ye I figured that!

So basically on "d.stm" There is a value which changes everytime the page is opened.
When I go to "sensors.stm" I want a div on it to display the value on "d.stm" every second. Seems simple but cant get it to work!

duffman85

Is xHttpRequest() a wrapper for XMLHttpRequest? It's hard to see what everything is doing without the rest of your code.

How is the onResponse function receiving those parameters - req,status,obj?

all that needs to be in your onResponse function is to check that the request has been successfull(Status=200) and that it has completed(readystate=4)

Then you can write the following in your onResponse function

var response = XHR.responseText;
xGetElementById('my_html_data').innerHTML = response;

W3Schools -AJAX ResponseXML is worth a look.