Need Help w/Quick AJAX Adjustment (do something if activex na)

JavaScript
1

I have this function for my AJAX:


function firstcheck() {
dtext = "";
		if (window.XMLHttpRequest)
  		{
  		xmlhttp=new XMLHttpRequest();
  		}
		else
  		{
  		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  		}
			xmlhttp.onreadystatechange=function()
  			{
  			if (xmlhttp.readyState==4 && xmlhttp.status==200)
    		{
    		dtext = xmlhttp.responseText;
    		}
  			}
xmlhttp.open("POST","/file.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
var tkey = "";
xmlhttp.send("tid="+ tkey +"");
}

Now, I want to add a bit of code that does something if ACTIVEX is not available or if the browser can’t support AJAX. How can I edit this to allow for that?

Cheers!
Ryan

2

You can just do:

if(ActiveXObject) {
alert(“yay we have activeX support”);
}
else {
alert(“nope, no activeX”);
}

3

Just add an if statement within you else statement to check whether xmlhttp is null or not. If so do something…

4

I’m trying to avoid jquery just to limit the size, but would I just do…


if(!xmlhttp) {
//no activex spotted
}

or should I just have an if statement before everything like:


if (!window.XMLHttpRequest && !ActiveXObject("Microsoft.XMLHTTP")) {
//no way for AJAX, so do this
} else {
//run rest of statement
}

Would that work?

Thanks
Ryan

5

For better well tested API I would recommend you to use jQuery AJAX which is pretty easier to implement.
http://docs.jquery.com/Ajax/jQuery.post#urldatacallbacktype