JavaScript Tutorials Beginner

Simple AJAX Chat

Basics

we have 2 files - index.html and w.php
index.html reads the content and sends your message to w.php
w.php writes the content and prunes it to $maxlines lines

content stored as text in chat.txt

this uses 2 http_requests - 1 for checking the content, 1 for sending your message

The setup is as simple as it can be

2 steps

copy index.html and w.php in a directory of your choice
create a file called chat.txt with write-rights 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

Ridiculously Simple - The Source

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  	/* spam-keywords & block ip's */  	$spam[] = "wojo.com";  	$spam[] = "dick";    	$blockip[] = "72.60.167.89";      	$msg = $_REQUEST["m"];  	if ($msg != "")  {  		/* Spam Control Part 1 */  		if (strlen($msg) < 2) { die(); }  		if (strlen($msg) > 3) {    			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();  			 }  		}		     		/* Preparing the Content */  		$fn = "chat.txt";  		$maxlines = 20;    		$handle = fopen ($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", $arr2);    		/* Spam Control Part 2 */  		if (substr_count($chattext, $msg) > 2) { die(); }    		/* Write */  		$out = $chattext . $msg . "\n";  		$out = str_replace("\'", "'", $out);  		$out = str_replace("\\\"", "\"", $out);  		  		$handle = fopen ($fn, 'w'); fwrite ($handle, $out);  fclose($handle);				  	}  ?>

add this on top to get a minimum-wait time:

  	$waitsecs = 5;   	$lastvisit = $_COOKIE["lachatlv"];  	setcookie("lachatlv", time());    	if ($lastvisit != "") {  		$diff = time() - $lastvisit;  		if ($diff < $waitsecs) { die();	}

â€”
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Simple AJAX Chat