Valider tekstboks

Heysan

Nogen der kan fortælle mig hvorfor dette script ikke virker? Man kan poste en besked uden at den melder fejl i nogen af felterne. Skal desuden have feltet "calculate" til at tjekke om man har regnet regnestykket 2*1 rigtigt ud. hvordan filan gør jeg det?

Dennis

<?
if ($side == "guestbook") {
?>
            </span>
            <table width="100%" border="0" class="Main_Text">
              <tr>
                <td><p>
                  <?php
// include the database configuration and
// open connection to database
include 'library/config.php';
include 'library/opendb.php';

// check if the form is submitted
if(isset($_POST['btnSign']))
{
    // get the input from $_POST variable
    // trim all input to remove extra spaces
    $name    = trim($_POST['txtName']);
    $email  = trim($_POST['txtEmail']);
    $url    = trim($_POST['txtUrl']);
    $message = trim($_POST['mtxMessage']);
    $calculate = trim($_POST['txtcalculate']);
   
    // escape the message ( if it's not already escaped )
    if(!get_magic_quotes_gpc())
    {
        $name    = addslashes($name);
        $message = addslashes($message);
        $calculate = addslashes($calculate);
    }
   
    // if the visitor do not enter the url
    // set $url to an empty string
    if ($url == 'http://')
    {
        $url = '';
    }
   
    // prepare the query string
    $query = "INSERT INTO guestbook (name, email, url, message, calculate, entry_date) " .
            "VALUES ('$name', '$email', '$url', '$message', '$calculate', current_date)";

    // execute the query to insert the input to database
    // if query fail the script will terminate       
    mysql_query($query) or die('Error, query failed. ' . mysql_error());
   
    // redirect to current page so if we click the refresh button
    // the form won't be resubmitted ( as that would make duplicate entries )
    header('Location: ' . $_SERVER['REQUEST_URI']);
   
    // force to quite the script. if we don't call exit the script may
    // continue before the page is redirected
    exit;
}
?>

                  <script language="JavaScript">
/*
    This function is called when
    the 'Sign Guestbook' button is pressed
    Output : true if all input are correct, false otherwise
*/
function checkForm()
{
    // the variables below are assigned to each
    // form input
    var gname, gemail, gurl, gmessage. gcalculate;
    with(window.document.guestform)
    {
        gname    = txtName;
        gemail  = txtEmail;
        gurl    = txtUrl;
        gmessage = mtxMessage;
        gcalculate = txtCalculate;
    }
   
    // if name is empty alert the visitor
    if(trim(gname.value) == '')
    {
        alert('Please enter your name');
        gname.focus();
        return false;
    }
   
    // if calculate is empty alert the visitor
    else if(trim(gcalculate.value) == '')
    {
        alert('Please do the calculation');
        gcalculate.focus();
        return false;
    }
   
    // alert the visitor if email is empty or the format is not correct
    else if(trim(gemail.value) != '' && !isEmail(trim(gemail.value)))
    {
        alert('Please enter a valid email address or leave it blank');
        gemail.focus();
        return false;
    }
    // alert the visitor if message is empty
    else if(trim(gmessage.value) == '')
    {
        alert('Please enter your message');
        gmessage.focus();
        return false;
    }
    else
    {
        // when all input are correct
        // return true so the form will submit       
        return true;
    }
}

/*
Strip whitespace from the beginning and end of a string
Input  : a string
Output : the trimmed string
*/
function trim(str)
{
    return str.replace(/^\s+|\s+$/g,'');
}

/*
Check if a string is in valid email format.
Input  : the string to check
Output : true if the string is a valid email address, false otherwise.
*/
function isEmail(str)
{
    var regex = /^[-_.a-z0-9]+@(([-a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
    return regex.test(str);
}
                  </script>

</p>
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                  <form method="post" name="guestform">
<table width="550" border="0" cellpadding="2" cellspacing="1">
  <tr>
  <td width="100">Name *</td> <td>
    <input name="txtName" type="text" id="txtName" size="30" maxlength="30"></td>
</tr>
  <tr>
  <td width="100">Email</td>
  <td>
    <input name="txtEmail" type="text" id="txtEmail" size="30" maxlength="50"></td>
</tr>
  <tr>
  <td width="100">Website URL</td>
  <td>
    <input name="txtUrl" type="text" id="txtUrl" value="http://" size="30" maxlength="50"></td>
</tr>
  <tr>
  <td width="100">Message *</td> <td>
    <textarea name="mtxMessage" cols="80" rows="5" id="mtxMessage"></textarea></td>
</tr>
  <tr>
  <td width="100">&nbsp;</td>
  <td>Calculate this: 2*1=?</td>
</tr>
  <tr>
    <td>&nbsp;</td>
    <td><input name="txtcalculate" type="text" id="txtcalculate" size="30" maxlength="30" /></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td><input name="btnSign" type="submit" id="btnSign" value="Sign Guestbook" onclick="return checkForm();" /></td>
  </tr>
</table>
</form>
<?php


// =======================
// Show guestbook entries
// =======================

// how many guestbook entries to show per page
$rowsPerPage = 5;

// by default we show first page
$pageNum = 1;

// if $_GET['page'] defined, use the value as page number
if(isset($_GET['page']))
{
    $pageNum = $_GET['page'];
}

// counting the offset ( where to start fetching the entries )
$offset = ($pageNum - 1) * $rowsPerPage;

// prepare the query string
$query = "SELECT id, name, email, url, message, DATE_FORMAT(entry_date, '%d.%m.%Y') ".
        "FROM guestbook ".
        "ORDER BY id DESC ".            // using ORDER BY to show the most current entry first
        "LIMIT $offset, $rowsPerPage";  // LIMIT is the core of paging

// execute the query
$result = mysql_query($query) or die('Error, query failed. ' . mysql_error());

// if the guestbook is empty show a message
if(mysql_num_rows($result) == 0)
{
?>
<p>  Guestbook is empty </p>
<?php
}
else
{
    // get all guestbook entries
    while($row = mysql_fetch_array($result))
    {
        // list() is a convenient way of assign a list of variables
        // from an array values
        list($id, $name, $email, $url, $message, $date) = $row;

        // change all HTML special characters,
        // to prevent some nasty code injection
        $name    = htmlspecialchars($name);
        $message = htmlspecialchars($message);       

        // convert newline characters ( \n OR \r OR both ) to HTML break tag ( <br> )
        $message = nl2br($message);
?>
<table width="550" border="0" cellpadding="0" cellspacing="0" class="Main_Text">
<tr>
  <td width="80" align="left"> <a href="mailto:<?=$email;?>" class="email">
  <?=$name;?>
  </a> </td>
  <td align="right"><small>
  <?=$date;?>
  </small></td>
</tr>
<tr>
  <td colspan="2">
  <?=$message;?>
  <?php
          // if the visitor input her homepage url show it
        if($url != '')
        { 
            // make the url clickable by formatting it as HTML link
            $url = "<a href='$url' target='_blank'>$url</a>";
?>
  <br> <small>Homepage : <?=$url;?></small>
 
 
 
  <?php
        }
?>
  <br />
  <img src="dots.gif" />  </td>
</tr>
</table>
<br>
<?php
    } // end while

// below is the code needed to show page numbers

// count how many rows we have in database
$query  = "SELECT COUNT(id) AS numrows FROM guestbook";
$result  = mysql_query($query) or die('Error, query failed. ' . mysql_error());
$row    = mysql_fetch_array($result, MYSQL_ASSOC);
$numrows = $row['numrows'];

// how many pages we have when using paging?
$maxPage  = ceil($numrows/$rowsPerPage);
$nextLink = '';

// show the link to more pages ONLY IF there are
// more than one page
if($maxPage > 1)
{
    // this page's path
    $self    = $_SERVER['PHP_SELF'];
   
    // we save each link in this array
    $nextLink = array();
   
    // create the link to browse from page 1 to page $maxPage
    for($page = 1; $page <= $maxPage; $page++)
    {
        $nextLink[] =  "<a href=\"$self?side=guestbook&page=$page\">$page</a>";
    }
   
    // join all the link using implode()
    $nextLink = "Go to page : " . implode(' &raquo; ', $nextLink);
}

// close the database connection since
// we no longer need it
include 'library/closedb.php';

?>
<table width="550" border="0" cellpadding="2" cellspacing="0">
<tr>
  <td align="right" class="text">
  <?=$nextLink;?>  </td>
</tr>
</table>
<?php
}
?>

                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                  </div>
                <span class="style17"></span></td>
              </tr>
            </table>
            <?
}
?>