php if statement in html form

[ryanmetzler3]

I have a comment system that runs on ajax. There is an html form that has a field for name, email, and comment. Then there is a submit button. I also have a button that gives you the option to log in. Here is the code for that:

<div id="addCommentContainer">
	<div id="login"><input type="submit" id="submit" value="Or Login" onclick="window.location='/LoginScripts/login.php'" /></div>
	<p>Add a Comment</p>
	<form id="addCommentForm" method="post" action="">
		<label for="name">Your Name</label>
		<input type="text" name="name" id="name" />	
		<label for="email">Your Email</label>
		<input type="text" name="email" id="email" />   
        <label for="body">Comment Body</label>
        <textarea name="body" id="body" cols="20" rows="5"></textarea>
        <input type="submit" id="submit" value="Submit" />
    </form>
</div>

If a user chooses to log in, then they would no longer need to type their name and email in each time they want to comment. So I was going to put a PHP if-statement around the name, email, and login button. This way they will not display if the user is logged in. I would then use another if-statement to redefine their name and email that is sent to the ajax. Something like this:

<div id="addCommentContainer">
	<?php if(!$username && !$userid) : ?>  
	<div id="login"><input type="submit" id="submit" value="Or Login" onclick="window.location='/LoginScripts/login.php'" /></div>
	<p>Add a Comment</p>
	<form id="addCommentForm" method="post" action="">
		<label for="name">Your Name</label>
		<input type="text" name="name" id="name" />	
		<label for="email">Your Email</label>
		<input type="text" name="email" id="email" />  
	<?php endif; ?>
	
	<?php if($username && $userid) : ?>  
		// redefine name and email that is sent to ajax. Some kind of mysql_query that will grab it from the DB of users.
	<?php endif; ?>	  
        <label for="body">Comment Body</label>
        <textarea name="body" id="body" cols="20" rows="5"></textarea>
        <input type="submit" id="submit" value="Submit" />
    </form>
</div>

I am very confused on how to pull this off. The code requires that name, email, and comment are filled before you can press the submit button. So I somehow need to redefine those values using a mysql_query for logged in users before they press the submit button. 

 

If anyone has any input on how to do this, that would be amazing!

[Barand]

Surely, all you need will be the userid to identify the user. Put the userid in a hidden field in the form with comments and pass that.