[RESOLVED] PHP and Ajax

alphasynaptic

Well the below code is an incomplete rewrite of a login script I wrote. It's still very much under construction so please no criticism. Anyway, it calls itself through Ajax to perform the login and such and is then supposed to call itself through Ajax again with a message stating the login was successful. The only problem is that where the Ajax function is called the second time, nothing is happening. I placed a simple echo to ensure that the block is being stepped into and it in fact is but the Javascript function is simply not executing the second time.

<?php
//If not logged in.
include 'mysql_connect.php';
$form_data = explode(',',$_POST['var1']);
Session_start();
if (!isset($_SESSION['username']))
	{
		//Perform login.
		if (isset($form_data[2]))
			{
				$username = strip_tags($form_data[0]);
				$password = md5(strip_tags($form_data[1]));
				//Query user table for user information.
				$userinfo = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'");
				list($id, $username, $password, $email) = mysql_fetch_row($userinfo);
				$_SESSION['username'] = $username;
				//Query character table for char info.
				$charinfo = mysql_query("SELECT name,class FROM characters WHERE id='$id'");
				list($charname, $class) = mysql_fetch_row($charinfo);
				$_SESSION['char'] = $charname;
				$_SESSION['class'] = $class;
				$_SESSION['id'] = $id;
				echo "poop<script language='javascript'>alert('poop')</script>"; <---javascript code right here isn't executing
				/*echo "<script language='javascript' TYPE='text/javascript'>
					alert('Poop');
					send(\'You are now logged in.\',\''.$path.'/display_files/statistics.php\',\'stats\');
					</script>";*/
			}
		//Display login form.
		else
			{
				echo'<center><br>
				Username: <input type="text" onchange="varArr.push(this.value)" size="15" maxlength="15"><br>
				Password: <input type="password" onchange="varArr.push(this.value)" size="10" maxlength="10"><br>
				<input type="submit" value="Login" onclick="varArr.push(this.value);send(varArr,\'display_files/statistics.php\',\'stats\')">
				<br>
				<a href="index.php?act=register">Register</a></center>';
			}
		}
//If logged in.
else
	{
		//Logout.
		if (isset($_POST['logout']))
			{
				session_destroy();
			}
		//Show statistics.
		else
			{
				$class = classname($_SESSION['class']);
				$charname = $_SESSION['char'];
				echo"<center>$charname</center>
				<center>$class</center><br>
				<center><form action='$_SERVER[PHP_SELF]' method='POST'>
				<input type='hidden' name='header' value='index'>
				<input type='submit' name='logout' value='Logout'>
				</form></center>";
			}
	}
?>

Thanks in advance for any help. I have a suspicion that the problem is that Ajax or any Javascript may not be executed within an Ajax stream, but this is only a thought. Any help or suggestions would be greatly appreciated. Also refrain from unrelated statements such as "you are not validating your login" as I said this script is under construction still and I am simply trying to debug this one error before I fix the rest.

leatherback

I am not completely sure how you are doing this (It does not make sense to me to call the same login script twice in the same procedural run).

However, if you replace the content of a <div> and you spit out that javascript during your second ajax run, it might not be considered as loading the script, and as such it is not interpreted & executed. You might have to add the function to your ajax handler instead.

alphasynaptic

Sorry, forgot to mention this is included within the index.php page and the scripts are included on there.

alphasynaptic

Hey guys think I came to my own conclusion while discussing this with a friend. I think it's because of the fact that Ajax processes the requested page and then sends you the output. This means the Javascript function executes in nowhere land. So my solution would be to comment it or insert the function into a text string and then uncommenting it with Javascript after it gets outputted from Ajax. Any comments or suggestions are welcome.

alphasynaptic

I implemented the solution. I commented the JScript function call and appended some special words to allow commenting for it's intended use. I am using two replace functions in the Ajax handler script to edit out the commenting before the response text is written back to inner html. I tried this on its own and the regular expressions do work and do cause the function call to fire when it is written back to inner HTML. The problem is that for some reason the script still isn't firing when built into my web site. I alerted the text within the JScript before I wrote it to inner HTML and found the text to be what I intended. I cannot figure out the issue here.

alphasynaptic

Found my solution on my own. It turned out the last post I made was very close to the final solution. I simply had to eval() the string instead of just setting the inner html to it. I also used some regular expressions, to allow both text and functions to work properly, in the Ajax response text handling function.