Detect Speed and Redirect

**hldr** · 03-26-2005, 01:50 AM

Hey guys,

Im having trouble having to find a javascript code.

Ive got 2 different website styles, one that its more for Broadband and another for 56kers "low-fi" i was hoping to find a script to auto detect the speed and if its slow then it would automaticly redirect to www.something.com/low-fi/
Im not sure if this is possible with javascript, but i belive its possible with php.

Do you guys know where i can find something like this (or similar)
If so Please DO suggest it.
Thanks in Advance

**jscheuer1** · 03-26-2005, 04:00 AM

I know of no script for this. I have seen talk of using a flash image and testing the load time but, I'm not up on flash. In any case, bandwidth fluctuates, images get cached, those are only two circumstances that will throw a bug in most schemes of this nature. Best bet, if you really want the slow pokes on one site and the speed demons on another is to give them a choice with radio buttons or a drop down form input. Let them think it is for their own good. You could even set a cookie so that their choices could persist session to session.

**mwinter** · 03-26-2005, 10:08 AM

Originally Posted by jscheuer1

Best bet, if you really want the slow pokes on one site and the speed demons on another is to give them a choice with radio buttons or a drop down form input.

Unless the OP really wants to write a properly handled, server-side form processing script I think links would be better. You can still use cookies to perform the redirection automatically on later visits.

Mike

**hldr** · 03-26-2005, 11:01 AM

Yeah how i wouldnt mind i guess, i wouldnt mind having a drop down instead or something, and everytime they go back on the site it will remember that option.

**DNCamper** · 04-08-2005, 05:00 PM

How about this...

Code:

<script type="text/javascript">
<!--

function setBandwidth(whichVal){
	var expdate = new Date();
	expdate.setTime(expdate.getTime() + (60*60*24*365));
	document.cookie = 'setbandwidth=' + whichVal + '; expires=' + expdate.toGMTString() + '; path=/';
}
BCt=new Date();
BCs=BCt.getTime();
function bandwidthDetect() {
 var args=bandwidthDetect.arguments;
 var el=(document.layers)?document.layers['Layer1'].document.Myimage1:document.Myimage1;
 if(el.complete){
 BCt=new Date();
 BCe=BCt.getTime();
 BCd=(BCe-BCs)/1000;
 if(document.cookie.indexOf('setbandwidth=1')>=0) {
	location.href=args[1];}else
 if(document.cookie.indexOf('setbandwidth=2')>=0) {
	location.href=args[2];}else
 if(BCd<args[0]){setBandwidth(1);location.href=args[1];}else
 if(BCd>=args[0]){setBandwidth(2);self.location.href=args[2];}
 }
}

//-->
</script>

Then place this in your "body tag"

Code:

<body onload="bandwidthDetect('4.5','300k.php','56k.php')">
<div id="Layer1" style="position:absolute; left:0px; top:0px; width:100px; height:100px; z-index:1; visibility: hidden"> 
  <img src="45k_image.jpg" alt="loadImage" width="100" height="100" border="0" name="Myimage1" /></div>
</body>

Found this little piece somewhere.

**jscheuer1** · 04-08-2005, 05:20 PM

If ya gotta go there, that's a good way but, what if 45k_image.jpg in is my cache and I'm on dial-up? Won't I get the cookie for broadband? What if I'm on broadband and bandwidth dips momentarily just as I get to your page, won't I get the cookie for slow-pokes?

**DNCamper** · 04-08-2005, 05:43 PM

True...when I have used this I made sure there was an option on the player to change the bandwidth manually. Well what if we add that the cookie expires as soon as the image is downloaded?

Yahoo uses one as well, but they use it in an .asp script... it sure to be more advanced than this one. Would like to see that code...

**cr3ative** · 04-08-2005, 06:11 PM

Originally Posted by jscheuer1

If ya gotta go there, that's a good way but, what if 45k_image.jpg in is my cache and I'm on dial-up? Won't I get the cookie for broadband? What if I'm on broadband and bandwidth dips momentarily just as I get to your page, won't I get the cookie for slow-pokes?

I should imagine there's a way to prevent caching of a particular image.
I've heard it around somewhere.

**mwinter** · 04-09-2005, 10:45 PM

Originally Posted by cr3ative

I should imagine there's a way to prevent caching of a particular image.
I've heard it around somewhere.

HTTP headers are sent back with every HTTP request, including images, scripts, and so forth. You could instruct the server to sent the appropriate caching headers to prevent user agents, or even caches and proxies along the route, from caching the image. How you go about doing this varies from server-to-server, but it is possible.

Mike

**kg2451** · 04-22-2005, 06:36 AM

Originally Posted by DNCamper

Yahoo uses one as well, but they use it in an .asp script... it sure to be more advanced than this one. Would like to see that code...

You said you wanted to see the code for the Yahoo ASP bandwidth script...well here it is:

Code:

<html>
<head>
<title>LAUNCHcast - Detecting Internet Connection Speed</title>
<script language="Javascript">
<!--
time = new Date();
var startTime = time.getTime();
// -->
</script>
<!--
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//(...I cropped some of this because my massage wouldn't fit...)
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-->
<script language="Javascript1.1">
<!--

//// calculate download time
	time	= new Date();
	var endTime = time.getTime();
	if (startTime == endTime) {
		var downloadTime = .01;
	} else {
		var downloadTime = (endTime - startTime)/1000; //conversion to seconds
	}
	var bandwidth_KBps = 10 / downloadTime;
	var bandwidth_Kbps = 100 / downloadTime;
//// determine bandwidth
	var suggestbw = 20;
	if (bandwidth_Kbps > 64)
		suggestbw = 64;
	else if (bandwidth_Kbps > 32)
		suggestbw = 32;
	
	var redirectTime = 0;
	var goHere = "bandwidth.asp?cid=1&iid=1&ltw=LaunchRadioTarget&p=1&m=59&d=0&mode=1&bridgeMode=1&pr=0&a=save&bw=" + suggestbw;

	function redirectUser() {
		setTimeout("go_now()", redirectTime);
	}

	function go_now() {
		window.location.replace(goHere);
	}

//-->
</script>
</head>
<body bgcolor="#666666" text="white" onload="redirectUser()" scroll="no">
<table width="100%" height="100%" cellspacing="0" cellpadding="0" border="0">
	<tr>
		<td align="center" valign="middle"><font face="verdana, arial" size=2><b>Detecting internet connection speed...</b></font><br></td>
	</tr>
</table>
</body>

</html>

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