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Clearing Post Data - Browser refresh re-submits email form

drewman

By drewman
in PHP Coding Help

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drewman Newbie

drewman

Posted
Posted

Hello,

 

I am using this little send to a friend script and although it works well the post data issues on browser refresh are annoying.  I would like to find some way of clearing the post data once the form was submitted.

 

Here is the code:

<?php
/*********************************************************
	This Free Script was downloaded at			
	Free-php-Scripts.net (HelpPHP.net)			
This script is produced under the LGPL license		
	Which is included with your download.			
Not like you are going to read it, but it mostly	
States that you are free to do whatever you want	
		With this script!						
	NOTE: Linkback is not required, 
but its more of a show of appreciation to us.					
*********************************************************/

//Include configuration file and function file
//(default location is in the same directory)
include_once('../config.php');

//Function to check for valid email
function is_valid_email($string) {
return preg_match('/^[.\w-]+@([\w-]+\.)+[a-zA-Z]{2,6}$/', $string);
}

//Check cur page
if($_POST['this_page'] == NULL){$_POST['this_page'] = 'http://'.$_SERVER['SERVER_NAME'].$_SERVER['PHP_SELF'];}

//If contact is being sent:
if($_POST['submit_id'] == 1){
//Check name entered
if($_POST['name'] == NULL){ $message = 'Please enter your name.';}

//check if email is enetered
if($message == NULL && $REQUIRE_MESS == 1 && $_POST['message_text'] == NULL){ $message = 'Please enter a comment.';}

//check if message is entered
if($message == NULL && $REQUIRE_MESS == 1 && $_POST['message_text'] == NULL){ $message = 'Please enter a comment.';}	

//check to send emails
if($message == NULL)
{
if($MULTIPLE_EMAILS == 1){
	//multiple emails
	$valid_emails = array();
	$emails = explode(',',$_POST['toemails']);

	foreach($emails as $email){
		$email = trim($email);
		if($email != NULL){
			if(is_valid_email($email) == false ){ 
				$temp_message .= '<br/>We couldn\'t send and email to: <font color="#0000FF">'.$email.'</font> because it is not valid.';
			} else {
				array_push($valid_emails,$email);
			}
		}
	}
	if(count($valid_emails) <=0 ){
		$message = 'Please enter at least one email to send message to.';
	}
} else {
	//one email
	if(is_valid_email($_POST['toemails']) == false ){ $message = 'Please enter a valid friend\'s email.';}
}
}
//End verifications, start processing
if($message == NULL){
	//compose user message templates replaces
	$do_search = array('$+name+$','$+page_send+$','$+message_text+$');
	$do_replace = array($_POST['name'],$_POST['this_page'],$_POST['message_text']);
	$subject = str_replace($do_search,$do_replace,$EMAIL_TEMPLATE);

	//Set Headers
	$headers = "Return-Path: ".$EMAIL_OPTIONS['TITLE']." <".$EMAIL_OPTIONS['FROM'].">\r\n"; 
	$headers .= "From: ".$EMAIL_OPTIONS['TITLE']." <".$EMAIL_OPTIONS['FROM'].">\r\n";
	$headers .= "Content-Type: ".$EMAIL_OPTIONS['TYPE']."; charset=".$EMAIL_OPTIONS['CHARSET'].";\n\n\r\n"; 

	if($MULTIPLE_EMAILS == 1){		
		foreach($valid_emails as $this_email){
			mail ($this_email,$EMAIL_OPTIONS['EMAIL_SUBJECT'],$subject,$headers);	
			$one_pass = true;
		}
	} else {
		mail ($_POST['toemails'],$EMAIL_OPTIONS['EMAIL_SUBJECT'],$subject,$headers);	
	}
	$message = 'Your emails have been sent, thank you.';
	$message .= $temp_message;
	$_POST = NULL;
}
}
if($message != NULL){
?>

<?php } ?>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post" name="contact" id="contact" style="display:inline;">
<table width="84%"  border="0" align="left" cellpadding="0" cellspacing="0">
<tr>
  <td width="16%" class="pclass">Your name: </td>
	<td width="31%"><input name="name" type="text" class="selectclass" id="name" value="<?php echo $_POST['name'];?>" size="20" maxlength="50" /></td>
	<td><?php if($MULTIPLE_EMAILS == 1){?>
      <span class="pclass">Your Friend's email(s):</span><br/>
  <em class="pclass">(separated by comma)</em>	  <?php } else {?>
  <span class="pclass">Your Friend's email:</span>	  <?php } ?></td>

</tr>
<?php
if($REQUIRE_EMAIL == 1){?>
<tr>
  <td width="16%" class="pclass">Your Email: </td>
	<td width="31%"><input name="email2" type="text" class="selectclass" id="email2" value="<?php echo $_POST['email'];?>" size="25" maxlength="50" /></td>
	<td width="41%"><input name="toemails" type="text" class="selectclass" id="toemails" value="<?php echo $_POST['toemails'];?>" size="20" maxlength="50" /></td>
</tr>
<?php } ?>
<tr>
  <td width="16%"><span class="pclass">Message:</span></td>
	<td width="31%"><input name="message_text" type="text" class="selectclass" id="message_text" value="<?php echo $_POST['message_text'];?>" size="25" /></td>
	<td colspan="2"><input type="submit" name="Submit" value="Send" />
	  
	  <input name="clear" type="reset" value="clear">
	  <input name="submit_id" type="hidden" id="submit_id" value="1" />
	  <input name="this_page" type="hidden" id="this_page" value="<?=$_POST['this_page'];?>" /></td>
	</tr>
<?php
if($REQUIRE_MESS == 1){?>

<?php } ?>
</table>     
</form>
</div><div id="sendfriend_message"><?=$message;?></div>
</div></div>
</div>
</body>
</html>

 

I heard something about using MD5 to store unique ids and tell the form not to submit once submitted, but I do not know how to implement this.

 

Any ideas anyone?

paul2463 Member

paul2463

Posted
Posted

the other way to do it is to not post to itself but use another page which sends the email and then use

<?php
header("Location: http://www.example.com/"); /* Redirect browser */

/* Make sure that code below does not get executed when we redirect. */
exit;
?>

on that page to bring it back,

 

all the post data then is dumped because the data is not posted back and all the fields will be empty

obsidian Member

obsidian

Posted
Posted

the other way to do it is to not post to itself but use another page which sends the email and then use

<?php
header("Location: http://www.example.com/"); /* Redirect browser */

/* Make sure that code below does not get executed when we redirect. */
exit;
?>

on that page to bring it back,

 

all the post data then is dumped because the data is not posted back and all the fields will be empty

 

Actually, even with a header redirect like that, if you refresh your page, the information will be requested to be resent (it may be a browser thing, though). I typically use this header redirection technique to send the user to a confirmation page that in turn uses a Javascript redirect back to their home page (or wherever). The javascript redirection actually gives you another entry into your browser history, so unless they actually go "back" a page, they can refresh 'til their heart's content.

drewman Newbie

drewman

Posted
  • Author
Posted

Is there any other way, as I like how the 

<?=$message;?>

appears on the same page, without flipping back and forth between pages.

 

But if this is the only way, do I change the 

<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post" name="contact" id="contact" style="display:inline;">

to say a process.php that will look like

<?php
header("Location: " . $_SERVER['HTTP_REFERER']); /* Redirect browser */
?>

then insert a javascript on this page to go back to the main page?

 

What happens to the message code here 

<?php
/*********************************************************
	This Free Script was downloaded at			
	Free-php-Scripts.net (HelpPHP.net)			
This script is produced under the LGPL license		
	Which is included with your download.			
Not like you are going to read it, but it mostly	
States that you are free to do whatever you want	
		With this script!						
	NOTE: Linkback is not required, 
but its more of a show of appreciation to us.					
*********************************************************/

//Include configuration file and function file
//(default location is in the same directory)
include_once('../config.php');

//Function to check for valid email
function is_valid_email($string) {
return preg_match('/^[.\w-]+@([\w-]+\.)+[a-zA-Z]{2,6}$/', $string);
}

//Check cur page
if($_POST['this_page'] == NULL){$_POST['this_page'] = 'http://'.$_SERVER['SERVER_NAME'].$_SERVER['PHP_SELF'];}

//If contact is being sent:
if($_POST['submit_id'] == 1){
//Check name entered
if($_POST['name'] == NULL){ $message = 'Please enter your name.';}

//check if email is enetered
if($message == NULL && $REQUIRE_MESS == 1 && $_POST['message_text'] == NULL){ $message = 'Please enter a comment.';}

//check if message is entered
if($message == NULL && $REQUIRE_MESS == 1 && $_POST['message_text'] == NULL){ $message = 'Please enter a comment.';}	

//check to send emails
if($message == NULL)
{
if($MULTIPLE_EMAILS == 1){
	//multiple emails
	$valid_emails = array();
	$emails = explode(',',$_POST['toemails']);

	foreach($emails as $email){
		$email = trim($email);
		if($email != NULL){
			if(is_valid_email($email) == false ){ 
				$temp_message .= '<br/>We couldn\'t send and email to: <font color="#0000FF">'.$email.'</font> because it is not valid.';
			} else {
				array_push($valid_emails,$email);
			}
		}
	}
	if(count($valid_emails) <=0 ){
		$message = 'Please enter at least one email to send message to.';
	}
} else {
	//one email
	if(is_valid_email($_POST['toemails']) == false ){ $message = 'Please enter a valid friend\'s email.';}
}
}
//End verifications, start processing
if($message == NULL){
	//compose user message templates replaces
	$do_search = array('$+name+$','$+page_send+$','$+message_text+$');
	$do_replace = array($_POST['name'],$_POST['this_page'],$_POST['message_text']);
	$subject = str_replace($do_search,$do_replace,$EMAIL_TEMPLATE);

	//Set Headers
	$headers = "Return-Path: ".$EMAIL_OPTIONS['TITLE']." <".$EMAIL_OPTIONS['FROM'].">\r\n"; 
	$headers .= "From: ".$EMAIL_OPTIONS['TITLE']." <".$EMAIL_OPTIONS['FROM'].">\r\n";
	$headers .= "Content-Type: ".$EMAIL_OPTIONS['TYPE']."; charset=".$EMAIL_OPTIONS['CHARSET'].";\n\n\r\n"; 

	if($MULTIPLE_EMAILS == 1){		
		foreach($valid_emails as $this_email){
			mail ($this_email,$EMAIL_OPTIONS['EMAIL_SUBJECT'],$subject,$headers);	
			$one_pass = true;
		}
	} else {
		mail ($_POST['toemails'],$EMAIL_OPTIONS['EMAIL_SUBJECT'],$subject,$headers);	
	}
	$message = 'Your emails have been sent, thank you.';
	$message .= $temp_message;
	$_POST = NULL;
}
}
if($message != NULL){
?>

 

Can i insert the message code on another page some how? -- not sure, I am way out of my depth here.

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