form - problem with browser cache

liunx · Jan 10, 2008

i read somewhere that it's advisable to tell the browser not to cache a form in case the user ends up getting your last error page -- and this makes sense to me -- i would like the form to reset back to start whenever the user presses refresh or types the form address into the browser -- i have the form designed to redisplay correct fields if the user makes an error in one of the other fields so there shouldn't be any problems - however neither the refresh or 'go' buttons reset the form - how can i do this 
 
any help greatly appreciated 
bob 
 
what i'm working with at the moment is 
<html> 
<head> 
</head> 
<body> 
 
<?php 
// invalidate browser caching of this page 
header( "Expires: Mon, 20 Dec 1998 01:00:00 GMT" ); 
header( "Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT" ); 
header( "Cache-Control: no-cache, must-revalidate" ); 
header( "Pragma: no-cache" ); 
 
// Handle older versions of PHP 
if( ! isset( $_GET ) )$_GET = &$HTTP_GET_VARS; 
if( ! isset( $_POST ) )$_POST = &$HTTP_POST_VARS; 
if( ! isset( $_SERVER ) ) $_SERVER = &$HTTP_SERVER_VARS; 
 
// Add as many Names/ Departments -- e-mail addresses as you want here 
$eMail[] = array( 'Information', <a href="mailto:'[email protected]">'[email protected]</a>' ); 
$eMail[] = array( 'TechSupport', <a href="mailto:'[email protected]">'[email protected]</a>' ); 
$eMail[] = array( 'Billing Questions', <a href="mailto:'[email protected]">'[email protected]</a>' ); 
 
 
// Original field values 
$nameOrigValue = "type your name"; 
$emailOrigValue = "type your email"; 
 
echo "<form method=\"post\" name=\"form\" ".((isset($_SERVER['PHP_SELF']))?'action="'.$_SERVER['PHP_SELF'].'"':'').">" 
?> 
 
To:<select size="1" name="To"> 
 
<?php 
foreach( $eMail as $k => $a ) 
if( (isset($_GET["To"])) && ( $_GET["To"] == $k) ) 
echo "<option value=\"$k\" selected>$a[0]</option>\n"; 
else 
echo "<option value=\"$k\">$a[0]</option>\n"; 
?> 
</select> 
 
Name:<input type="text" id = "name" name="name" size="44" value= 
<?php echo ("\"" . ($_POST['name']=='' ? $nameOrigValue: $_POST['name']) ."\"" ); ?> 
onFocus = "this.value='';" 
/> 
 
 
E-Mail:<input type="text" id = "EMail"name="EMail" size="44" value = 
<?php echo ("\"" . ($_POST['EMail']=='' ? $emailOrigValue: $_POST['EMail']) ."\"" ); ?> /> 
 
 
Subject: 
<input type="text" name="Subject" size="44"> 
<textarea rows="10" name="Body" cols="45"></textarea> 
 
<input type="submit" name="sent" value="Send"> 
</form> 
 
 
<?php 
 
if ($sent) // validate & send when user submits 
{ 
 
// validate first 
 
$valid =true; 
if ( (empty( $name )) || ( ($name == $nameOrigValue ) ) ) 
{ 
$errmsg .= "enter your name ... "; $valid = false; 
?> 
<script language="javascript"> 
document.form.name.style.color = "red"; 
</script> 
<?php 
} 
 
if ( (empty( $EMail )) || ( ($EMail == $emailOrigValue) ) ) 
{ 
$errmsg .= "enter your email ... "; $valid = false; 
} 
 
 
if($valid!=true) // there are errors so display error message 
{ 
echo($errmsg); 
} 
 
else 
{ 
// send 
 
echo "Attempting to send message\n"; 
 
$userip = ($_SERVER['X_FORWARDED_FOR']) ? $_SERVER['X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR']; 
 
if( get_magic_quotes_gpc() == 1 ) { 
$_POST["Subject"] = stripslashes( $_POST["Subject"] ); 
$_POST["Body"] = stripslashes( $_POST["Body"] ); 
} 
 
if( mail( '"' . $eMail[$_POST["To"]][0] . '" <' . $eMail[$_POST["To"]][1] . '>', 
$_POST["Subject"], $_POST["Body"], 
'Return-Path: "' . $_POST["From"] . '" <' . $_POST["EMail"] . ">\n" 
. 'From: "' . $_POST["From"] . '" <' . $_POST["EMail"] . ">\n" 
. 'Reply-To: "' . $_POST["From"] . '" <' . $_POST["EMail"] . ">\n" 
. "X-Mailer: PHP/" . phpversion() . "\n" 
. "X-From-IP: " . $userip ) ) 
echo "Message Sent Successfully"; 
 
else 
echo "UNABLE To Send Message."; 
} 
} 
?> 
</body> 
</html>Try the "Perl" ForumThe most common so called web browser generally doesn't understand HTTP so try also putting those cache clearing headers into meta http-equiv tags in the HTML of your pages.Originally posted by ray326 
The most common so called web browser generally doesn't understand HTTP so try also putting those cache clearing headers into meta http-equiv tags in the HTML of your pages. 
 
i'm really not too well up on this -- do you mean aswell as what i've got or instead of what i've got 
 
also would you mind giving me a quick one line example 
 
ps writing mainly for IE and Moz 
 
 
thanksOk this is just off the top of my head but this is what I think those headers would look like imbedded as meta tags in the head of your HTML page. 
 
<meta http-equiv="Expires" content="0"> 
<meta http-equiv="Cache-Control" content="no-cache"> 
<meta http-equiv="Pragma" content="no-cache">

form - problem with browser cache

liunx

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