Most Simple Ajax Chat Room

demo
if crowded, try room2

forum | download

news

10.6.2007 - Update to 3.1
- New: Support of Special Characters
- Simplification of the Javascript Code

about

easy to use ajax chat script

css style
usernames (thx to derek)
efficient spam filter
new (v3): nice speedup

only 2 files needed (index.html, w.php)
index.html reads the content & sends your message to w.php
w.php writes the content and prunes it to $maxlines lines

content stored as text in chat.txt

2 http_requests (1 for checking content, 1 for sending your message)

setup

2 steps
- copy index.html and w.php in a directory of your choice
- create a file called chat.txt (writeable for php)

you could also do like this:
- copy index.html and w.php
- chmod 777 the whole dir
- start the app to create the chat.txt file
- chmod 755 the dir and 777 the chat.txt

source (download)
Feel free to use/modify it for whatever you want. It's just about the idea.

The 20 lines of JavaScript sourcecode you find in here:

index.html

And this is the w.php, which also prunes the content:

<?php
	$fn = "chat.txt";
	$maxlines = 18;
 	$nick_maxlength = 9;
	
        /* Set this to a minimum wait time between posts (in sec) */
        $waittime_sec = 0;

	/* spam keywords */
	$spam[] = "nigger";
	$spam[] = "cum";
	$spam[] = "dick";
	$spam[] = "EAT coon";

	/* IP's to block */
	$blockip[] = "72.60.167.89";

	/* spam, if message IS exactly that string */	
	$espam[] = "ajax";
	
	/* Get Message & Nick from the Request and Escape them */
	$msg = $_REQUEST["m"];
	$msg = htmlentities(stripslashes($msg));

	$n = $_REQUEST["n"];
	$n = htmlentities(stripslashes($n));

	if (strlen($n) >= $nick_length) { 
		$n = substr($n, 0, $nick_length); 
	} else { 
		for ($i=strlen($n); $i<$nick_length; $i++) $n .= " ";
	}

        if ($waittime_sec > 0) {
                $lastvisit = $_COOKIE["lachatlv"];
                setcookie("lachatlv", time());

                if ($lastvisit != "") {
                        $diff = time() - $lastvisit;
                        if ($diff < 5) { die(); }
                }
        }

	if ($msg != "")  {
		if (strlen($msg) < 2) { die(); }
		if (strlen($msg) > 3) { 
			/* Smilies are ok */
			if (strtoupper($msg) == $msg) { die(); }
		}
		if (strlen($msg) > 150) { die(); }
		if (strlen($msg) > 15) { 
			if (substr_count($msg, substr($msg, 6, 8)) > 1) { die();    }
		}

		foreach ($blockip as $a) {
			if ($_SERVER["REMOTE_ADDR"] == $a) { die(); }
		}
		
		$mystring = strtoupper($msg);
		foreach ($spam as $a) {	
			 if (strpos($mystring, strtoupper($a)) === false) {
			 	/* Everything Ok Here */
			 } else {
			 	die();
			 }
		}		

		foreach ($espam as $a) {
			if (strtoupper($msg) == strtoupper($a)) { die(); }		
		}
				
		$handle = fopen ($fn, 'r'); 
		$chattext = fread($handle, filesize($fn)); fclose($handle);
		
		$arr1 = explode("\n", $chattext);

		if (count($arr1) > $maxlines) {
			/* Pruning */
			$arr1 = array_reverse($arr1);
			for ($i=0; $i<$maxlines; $i++) { $arr2[$i] = $arr1[$i]; }
 			$arr2 = array_reverse($arr2);			
		} else {
 			$arr2 = $arr1;
 		}
		
		$chattext = implode("\n", $arr2);

		if (substr_count($chattext, $msg) > 2) { die(); }

		$out = $chattext . $n . " | " . $msg . "\n";
		$out = str_replace("\'", "'", $out);
		$out = str_replace("\\\"", "\"", $out);
		
		$handle = fopen ($fn, 'w'); fwrite ($handle, $out);  fclose($handle);				
	}
?>