Hello, I have my site set up so that everything is done with AJAX requests to a script depending on what action is taken. If my script returns an error - such as the user is not allowed to take the action they tried to take - it returns an error message.

What I would like is for AJAX to know when there is an error returned, and I know there is an error parameter for the ajax function, but as far as I know that is only for HTTP error codes - so how would I modify my PHP script to return an error that the ajax would know it is an error?

Thank you for any help given!
Key

Your could control errors with php!

Example!

with '@' you can control functions errors!

<?php
if(@$con=mysql_connect('localhost','user','pass'))
{
  echo "Connect";
}else{
  echo "Error!";
}
?>

Returned if can connect to database "Connect" else "Error".
This code cannot return any other errors!!!

You want this?

I know that I can return errors with PHP - and I do that, but if I want my errors to show up in a different way than my other messages returned by my script, how could I do that with the ajax function? Ex: make errors red, but other messages not red.

I just thought about that for my example- it was a bad one. What if I wanted the error to pop up in a javascript window like Shadowbox? I would have to use the error function in ajax to do that - so I want to know how I would have my php script return an error to ajax so that it would know to use the error function. (I'm using the jQuery ajax function too - that probably would have been pertinent.)

Ex:

$.ajax({
   type: "POST",
   url: "some.php",
   data: "name=John&location=Boston",
   success: function(msg){
     alert( "Data Saved: " + msg );
   },
   error: function(msg){
      // Pop up in a shadowbox code
   }
 });

The ajax would have to know that it is an error - so what do I pass with php to let it know that?

I think this is good for your problem!

$("body").append("<div id='error'>Error</div>");

For creating a div element with id. And in style : #error { color:red; }

Use jQuery in some.php file with top command.

This is good?

No, your not understanding what I would like to achieve. jQuery's AJAX function has an error parameter that is executed when there is an error during the AJAX request. As far as I know it only catches HTTP error codes, so I wanted to know if there was a way for me to send something from my php script that alerts the AJAX code that an error occurred in the script.

try it

I think this is good for you!

this code is for : b.php

<html>
<head>
<style type="text/css">
#error
{
	color:red;
}
#success
{
	color:green;
}
</style>
<script language="javascript" src="jquery.min.js"></script>
<script language="javascript">
$.ajax({
   type: "POST",
   url: "a.php",
   data: "q=test",
   success: function(msg)
	{
    // document.getElementById('div').innerHTML = msg ;
	if(msg == "true")
	{     
		$(document).ready(function() { $("div").append("<div id='success'>Success!</div>"); });
	}else{
    		$(document).ready(function() { $("div").append("<div id='error'>Error</div>"); });
	}
	},
	   error: function(msg){
     	$(document).ready(function() { $("div").append("<div id='error'>Error</div>"); });
   }
 });
</script>
</head>
<body>
<div id="div"></div>
</body>
</html>

this code is for: a.php

<?php
if($_POST['q']=="test")
{
	echo "true";
}else{
	echo "false";
}
?>

This is good?

It would work, but it was not what I was hoping to do. What I do now is search the return value for the word "Error" in bold text, and then change the class of the div, but I was looking to see if the error parameter in jQuery's ajax function was a better way to do it.

The success: and error: parameter in jQuery is just for returning data!
means when ajax can connect to your file and can return any data , success part will be running and when jQuery cannot connect to your file or cannot returning data or any other errors , the error part will be running!

Okay, so there is no way to do what I was looking to do then. Thank you.