error handling

ngreenwood6 · August 1, 2008

I am trying to get my errors to post to the same page. there is an email, firstname, and lastname field. ex. if the user doesnt enter their email on that same page put the error. my code looks like this:

if (!$get_email)
{
echo ("You are missing some information!");
}

How can I incorporate what I am trying to do into my code? Any help is appreciated as always.

MaaSTaaR · August 1, 2008

Hello ..

I don't know if I understood you correctly or not, but you may want to do something like that :

if (!$get_email)
{
    die("You are missing some information!");
}

ngreenwood6 · August 1, 2008

That works but it didnt solve my issue. I am trying to get the error to post to the same page where you are putting in the data. (ex. if you forget to put in your email address, it displays "you are missing some information" next to the form input on the same page) When i submit the form and forget an email address now it just opens a new page and says "you are missing some information" on a new blank page. I dont want a new blank page i want it displayed on the form page where you are trying to submit it.

DarkWater · August 1, 2008

Well you need to handle the form on the same page that you display it then. At the top of the page do something like:

<?php

if (isset($_POST['submit'])) {

//process form

}

?>

trq · August 1, 2008

You mean you want the error messages displayed on the page your form is on? Example....

form.php

<?php session_start(); ?>
<form action="process.php" method="post">
 <input type="text" name="name"><?php echo (isset($_SESSION['name_error'])) ? "You must supply a name" : ""; ?><br />
 <input type="text" name="email"><?php echo (isset($_SESSION['email_error'])) ? "You must supply an email address" : ""; ?><br />
 <input type="submit" name="submit">
</form>

process.php

<?php

 $err = false;
 session_start();
 if (isset($_POST['submit'])) {
   if (empty($_POST['name'])) {
     $_SESSION['name_error'] = true;
     $err = true;
   }
   if (empty($_POST['email'])) {
     $_SESSION['email_error'] = true;
     $err = true;
   }
   if ($err) {
     header("location: form.php");
   } else {
     unset($_SESSION);
     // process form
   }
 }

?>

ngreenwood6 · August 1, 2008

darkwater im not sure that i know what you mean. can you elaborate some or possibly give me an example?

DarkWater · August 1, 2008

Yeah, sure. You need to attempt to handle the form on the same page that it is displayed. For example:

<?php
if (isset($_POST['submit'])) {
    $last_name = $_POST['lname'];
    $first_name = $_POST['fname']; 
    if (empty($last_name) || empty($first_name)) {
            $errors[] = "You forgot some information!";
    }
}
?>
<h2>Just a test form!</h2>
<?php
if (is_array($errors)) {
   foreach ($errors as $error) {
       echo "- $error<br />";
   }
}
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
First Name: <input type="text" name="fname" value="<?php echo htmlentities($first_name, ENT_QUOTES); ?>" />
Last Name: <input type="text" name="lname" value="<?php echo htmlentities($last_name, ENT_QUOTES); ?>" />
<input type="submit" name="submit" value="Submit Form" />
</form>

ngreenwood6 · August 1, 2008

I got it now. sorry it is working thanks for all of your help!

ngreenwood6 · August 1, 2008

Darkwater you definitely hit the nail on the head. thank you for the help!

DarkWater · August 1, 2008

Any time. =)

cooldude832 · August 1, 2008

there is a common myth out there that forms have to process to a page other then themselves that is not the case

ngreenwood6 · August 1, 2008

I tried your code and it worked fine. I tried to change my file from 2 pages to 1 but i kept getting different errors and stuff. Could you help me try to combine it so that my errors come up correctly?

The first page is the page with the form on it:

<html>
<head>
<title>Sign up for newsletter!</title>
</head>

<!--beginning statement-->
If you would like to sign up for the newsletter please use this form!

<br><br>

<form name="input" method="post" action="news.php">
Enter your email address:
<input name="get_email" type="text" id="get_email">
<br>
Enter your first name:
<input name="get_firstname" type="text" id="get_firstname">
<br>
Enter your last name:
<input name="get_lastname" type="text" id="get_lastname">
<br>
<input type="submit" name="submit" value="Submit">

</form>

<br><br>

To view a list of registered emails <a href="list.php">click here</a>.

<br><br>

<body>
</body>
</html>

The second page is the page where it processes it:

<?php

//include our variables
include ("variables.php");
include ("db.php");

//connect to database
$mysqli_connect = mysqli_connect($host,$db_user,$db_pass,$db_name)
or die ("Could not connect to database");

if (empty($get_email) || empty($get_firstname) || empty($get_lastname))
{
include ("index.php");
echo "You are missing some information";
}
else
{
//check for valid format of email address
if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $get_email))
{
echo "The email you have entered is not a valid email format.";
}
else
{
//check to see if data is in database
$query_string = "SELECT email FROM users WHERE email = '$get_email' LIMIT 1";
$query = mysqli_query($mysqli_connect,$query_string)or die(mysqli_error($mysqli_connect));
$num = mysqli_num_rows($query);

}
//display this error if data is already in database
if ($num != 0)
{
include ("index.php");
echo "That email is in use by another account.";
}
else
{

//variable to send the data if all data is correct
$result = mysqli_query($mysqli_connect,$putinto_db)
or die ("Error: ".mysqli_error($mysqli_connect));
?>
Congratulations! To view a list of registered emails <a href="list.php">click here</a>.
<?php
}
}
?>

If you need any additional info please let me know.

trq · August 1, 2008

Have you even read the replies previous replies?

ngreenwood6 · August 1, 2008

yes, i did and like i said the form that he gave me worked when i tried using it how he coded it. however when i tried to embed it into my script it didn't work. i even tried to make my script one page but it wasn't working which is why i asked if he could help me create a new single page with this embedded into it.

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error handling

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