Disappearing values

w3sl3y2003 · August 22, 2006

Hi all,

I'm having a problem with self-processing forms (forms that have action=$PHP_SELF) losing their values. What i do is store the values of certain variables in hidden fields. I give the hidden fields the same name as the variables. But as soon as i submit the form, i check the source after the page has been rendered and i see that the values in the hidden fields have disappeared.

Eg.
[b]Before submit[/b]
<form method="POST" action="/app_ed/frmUpdate.php">
<input type="hidden" name="strNewText" value=" This is a test message on the dev webserver ">
<input type="hidden" name="strOldText" value=" This is a test message ">
<input type="submit" name="btnUpdateSubmit" value="Submit" value='Yes/No' onclick='return confirm("Are you satisfied with the new message?");'>
</form>

[b]After submit[/b]
<form method="POST" action="/app_ed/frmUpdate.php">
<input type="hidden" name="strNewText" value=" ">
<input type="hidden" name="strOldText" value=" ">
<input type="submit" name="btnUpdateSubmit" value="Submit" value='Yes/No' onclick='return confirm("Are you satisfied with the new message?");'>
</form>

What could've caused the values to disappear?

HuggieBear · August 22, 2006

You haven't posted any of your PHP code here. Help us to help you ;)

Regards
Rich

w3sl3y2003 · August 22, 2006

okay HuggieBear,

[b]frmSubmit.php[/b]

[code]<html>
<head>
<title>Applet Text Editor</title>
</head>
<body>
<form action="frmUpdate.php" method="POST">
<?php
$preview_file = "scroller/preview_scroller.txt";
$handle = fopen($preview_file, 'r');
$MAX_DATA = 500; //READ IN 500 BYTES OF DATA
$total_data = '';

if(file_exists($preview_file))
{
while($data = fread($handle,$MAX_DATA))
{

$total_data = $total_data. $data; //APPEND INPUT
}

echo "<input type=\"hidden\" name=\"current_scroller_text\" value=\"" .
$total_data .
"\">";

echo "<textarea name=\"txtScrollerText\" rows=8 cols=60>".
$total_data .
"</textarea>";

fclose($handle);

}
?>

<br>
<input type="submit" name="btnSubmit" value="submit">
<br>
</form>
</body>
</html>[/code]

[b]frmUpdate.php[/b]

[code]<?php
if(isset($_POST['btnUpdateSubmit']))
{
//header("Location: frmSubmit.php");
//should write "old" text back into preview file
if('return confirm("Are you satisfied with the new message?");')
{
// $txtScrollerText = $_POST['txtScrollerText'];
// print("strScrollerText = ".$strScrollerText);
$production_file = "../scroller/scroller.txt";
$prod_handle = fopen($production_file, 'w');
fwrite($prod_handle,$strScrollerText);
fclose($prod_handle);

header("Location: frmSubmit.php");
}
else
{
// $current_scroller_text = $_POST['current_scroller_text'];
$preview_file = "scroller/preview_scroller.txt";
$preview_handle = fopen($preview_file, 'w');
fwrite($preview_handle,$strOldPreviewText);
fclose($preview_handle);

header("Location: frmSubmit.php");
}
}
else
{
$strScrollerText = $_POST['txtScrollerText'];
$strOldPreviewText = $_POST['current_scroller_text'];
// print("current_scroller_text : " . $strScrollerText);

$preview_file = "scroller/preview_scroller.txt";
$preview_handle = fopen($preview_file, 'w');
fwrite($preview_handle,$strScrollerText);
fclose($preview_handle);

}

?>
<html>
<body>



<form method="POST" action="<? print $_SERVER['PHP_SELF']?>">
<input type="text" name="strScrollerText" value=" <?php print $strScrollerText ?> ">
<input type="text" name="strOldPreviewText" value=" <?php print $strOldPreviewText ?> ">
<input type="submit" name="btnUpdateSubmit" value="Submit" value='Yes/No' onclick='return

confirm("Are you satisfied with the new message?");'>

</form>
</body>
</html>[/code]

[b]Please use the code tags when posting code to the forum.[/b]

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