validating checkbox !

ilikephp · May 12, 2009

Hi, How can I validate a checkbox plz?

I am using the script below and it gives me an error:

in header:

$accept = trim($_POST['accept']);
  if (empty($accept)) {
    $error['accept'] = '* required';
    }

In HTML:

<input type="checkbox" name="accept" id="accept"
<?php if(isset($error)) {echo "value='$accept'";} ?> />

jackpf · May 12, 2009

What's the error?

MatthewJ · May 12, 2009

Is it just me... or does your checkbox only have a value attribute if there is an error?

ilikephp · May 12, 2009

the error is:

Notice: Undefined index: accept in C:\www\x.php on line 34

the line 34 contains:

  $accept = trim($_POST['accept']);
  if (empty($accept)) {
    $error['accept'] = '* required';
    }

Ken2k7 · May 12, 2009

I assume $_POST['accept'] doesn't exist. You should check if the form is submitted.

MatthewJ · May 12, 2009

Again, because your field only has a value if there is an error... the value in a checkbox should always be there. How else would you put data in it?

Ken2k7 · May 12, 2009

Again, because your field only has a value if there is an error... the value in a checkbox should always be there. How else would you put data in it?

It's a checkbox, you don't put data in it. And HTML errors are not PHP errors.

MatthewJ · May 12, 2009

<input type="checkbox" name="accept" id="accept" value='whatevervaluethecheckboxrepresents'/>

Also, there shouldn't be any reason to use trim() on a checkbox... it only passed the contents of the value attribute so unless you put spaces in the value, it will not trim anything.

MatthewJ · May 12, 2009

Again, because your field only has a value if there is an error... the value in a checkbox should always be there. How else would you put data in it?

It's a checkbox, you don't put data in it. And HTML errors are not PHP errors.

Um... His checkbox has no value?? I am very confused as to your reply as he is trying to set the value with the contents of a variable...

MatthewJ · May 12, 2009

I see what you mean.. you just missed that I was saying exactly the same thing... The value attribute is set in the html code... you don't get to enter data, only a check. he is trying to enter data.

Ken2k7 · May 12, 2009

That's fine and all, but HTML will just ignore it. It doesn't solve his error.

ilikephp · May 12, 2009

when I tick the checkbox I dont get any error, if I click submit without checking the box I get the error:

he is my whole code:

<?php
if (array_key_exists('ewComments', $_POST)) {
  // mail processing script
  // remove escape characters from POST array
if (get_magic_quotes_gpc()) {
  function stripslashes_deep($value) {
    $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value);
    return $value;
    }
  $_POST = array_map('stripslashes_deep', $_POST);
  }
  // validate the input, beginning with name
  $name = trim($_POST['name']);
  if (empty($name)) {
    $error['name'] = '* required';
    } 
$email = $_POST['email'];
  // check for valid email address
  $pattern = '/^[^@]+@[^\s\r\n\'";,@%]+$/';
  if (!preg_match($pattern, trim($email))) {
    $error['email'] = '* required';
    }


$password = trim($_POST['password']);
$password2 = trim($_POST['password2']);
if ($password != $password2){
    $error['password'] = 'Wrong Password';
}
  if (empty($password)) {
    $error['password'] = '* required';
    } 
  
  $accept = trim($_POST['accept']);
  if (empty($accept)) {
    $error['accept'] = '* required';
    } 
  }
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Registration Form</title>
<?php include('styles/style_rules.php'); ?>
<script type="text/JavaScript">
<!--
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_validateForm() { //v4.0
  if (document.getElementById){
    var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
    for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args[i]);
      if (val) { nm=val.name; if ((val=val.value)!="") {
        if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
          if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
        } else if (test!='R') { num = parseFloat(val);
          if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
          if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
            min=test.substring(8,p); max=test.substring(p+1);
            if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
      } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
    } if (errors) alert('The following error(s) occurred:\n'+errors);
    document.MM_returnValue = (errors == '');
} }
//-->
</script>
</head>

<body>
<div id="wrapper">
  <div id="maincontent">
    <form action="<?php $_SERVER['PHP_SELF']; ?>" method="post" name="contactForm" id="contactForm">
      <h1 align="center">Course Registration Form      </h1>
      <table width="516" border="1" align="center" bgcolor="#cccccc">
        <tr>
          <td width="179">Full Name:</td>
          <td width="321"><label for="name"></label>            <span class="warning">
            <input type="text" name="name" id="name"
	<?php if(isset($error)) {echo "value='$name'";} ?> />
          </span><span class="warning">
          <?php if (isset($error['name'])) { ?>
              <?php echo $error['name']; ?>
              <?php } ?>
          </span><br /></td>
        </tr>
        <tr>
          <td>Address</td>
          <td><label>
          <textarea name="textarea" id="textarea" cols="25" rows="4"></textarea>
          </label></td>
        </tr>
        <tr>
          <td>Email</td>
          <td><span class="warning">
            <input type="text" name="email" id="email"
	<?php if(isset($error)) {echo "value='$email'";} ?> />
            <?php if (isset($error['email'])) { ?>
            <?php echo $error['email']; ?>
            <?php } ?>
          </span></td>
        </tr>
        <tr>
          <td>Password</td>
          <td><label><span class="warning">
            <input type="text" name="password" id="password"
	<?php if(isset($error)) {echo "value='$password'";} ?> />
            <?php if (isset($error['password'])) { ?>
            <?php echo $error['password']; ?>
            <?php } ?>
          </span></label></td>
        </tr>
        <tr>
          <td>Confirm Password</td>
          <td><span class="warning">
            <input type="text" name="password2" id="password2"
	<?php if(isset($error)) {echo "value='$password2'";} ?> />
            <?php if (isset($error['password'])) { ?>
            <?php echo $error['password']; ?>
            <?php } ?>
          </span></td>
        </tr>
        <tr>
          <td>Date of Birth</td>
          <td><?php # Script 2.6 - calendar.php

// This script makes three pull-down menus
// for an HTML form: months, days, years.

// Make the months array:
  $months = array (1 => 'January','February', 'March', 'April', 'May','June', 'July', 'August', 'September','October', 'November', 'December');

// Make the days and years arrays:
$days = range (1, 31);

// Make the months pull-down menu:
echo '<select name="month">'; 
foreach ($months as $key => $value) {
echo "<option value=\"$key\">$value </option>\n";
}

echo '</select>';
// Make the days pull-down menu:
echo '<select name="day">';
foreach ($days as $value) {
echo "<option value=\"$value\">$value
</option>\n";
}
echo '</select>';

echo '</select>';

?>
          <input name="year" type="text" id="year" onblur="MM_validateForm('year','','NinRange1975:2050');return document.MM_returnValue" size="4" maxlength="4" />
          (yyyy)</td>
        </tr>
        <tr>
          <td>Gender</td>
          <td><table width="175" border="0">
            <tr>
              <td><input name="radiobutton" type="radio" value="radiobutton" />
                Male </td>
              <td><input name="radiobutton" type="radio" value="radiobutton" />
                Female</td>
            </tr>
          </table></td>
        </tr>
        <tr>
          <td>Please choose topics of interests </td>
          <td><table width="223" border="0" align="left">
            <tr>
              <td><input type="checkbox" name="checkbox" value="checkbox" />
                VB.NET <br /></td>
              <td><input type="checkbox" name="checkbox2" value="checkbox" />
                SQL</td>
            </tr>
            <tr>
              <td><input type="checkbox" name="checkbox3" value="checkbox" />
                PHP </td>
              <td><input type="checkbox" name="checkbox4" value="checkbox" />
                Java</td>
            </tr>
          </table></td>
        </tr>
        <tr>
          <td align="right"><p>Hobby</p>
          <p>(Select multiple choices by holding the ctrl key and clicking on them one by one)</p></td>
          <td align="center"><select name="select" size="7" multiple="multiple">
            <option>Outdoor Sports</option>
            <option>Adventure Sports</option>
            <option>Pop Music</option>
            <option>Rock Music</option>
            <option>Aggressive Music</option>
            <option>Photography</option>
          </select></td>
        </tr>
        <tr>
          <td align="left"><p>I accept the </p>
          <p>Learning Contract</p></td>
          <td align="center"><span class="warning">
       <input type="checkbox" name="accept" id="accept" value='whatevervaluethecheckboxrepresents'/>
           
	<?php if(isset($error)) {echo "value='$accept'";} ?> />
          </span><span class="warning">
          <?php if (isset($error['accept'])) { ?>
              <?php echo $error['accept']; ?>
              <?php } ?>
          </span></td>
        </tr>
        <tr>
          <td colspan="2" align="center"><input name="ewComments" type="submit" id="ewComments" value="Send comments" /></td>
        </tr>
      </table>
      <p> </p>
      <p>
        <label for="email"></label>
        <br />
      </p>
      <p> </p>
    </form>
  </div>

</div>
</body>
</html>

Ken2k7 · May 12, 2009

When you say you get an error, don't you think it would be relevant to post the error message rather than just saying you have an error?

ilikephp · May 12, 2009

I post it before:

Notice: Undefined index: accept in C:\www\x.php on line 34

Ken2k7 · May 12, 2009

I assume $_POST['accept'] doesn't exist. You should check if the form is submitted.

And I posted that before. ^

jackpf · May 12, 2009

Checkboxes aren't sent if they're not checked. So you'll have to use isset(), or turn off notices.

ilikephp · May 12, 2009

Sry, but I got lost ???

How can I check if the form is submitted plz?

Thanks in advance...

Ken2k7 · May 12, 2009

Check if $_POST['ewComments'] is set or not. :-\

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validating checkbox !

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