checkbox validation help

[PRodgers4284]

I need some validation to check if i checkbox has been ticked on a website registration form, if its not ticked output an error, can anyone help me with this, my validation error checking code so far is:

 

//Username check) 
if (empty($username)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter a username
$username_message = '*Please enter a username*';
} 
if(usernameTaken($username,$conn))
{
    $error_stat = 1;
    $username_message = '*User name is taken please choose another one*';
}

$username = $_POST['username']; 
$username = trim($username); 

   if (strlen($username) > 12){ 
   $error_stat = 1; 
   $username_message = '*The username must be 12 characters or less*'; 
}  





//Password check) 
if($password1 != $password2)
{
    $error_stat = 1;
    $password_message = '*Passwords don\'t match*';
}

if (empty($password1)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter a username
$password_message = '*Please enter a password*';
}

if(!$password1 || !$password2)
{
    $error_stat = 1;
    $password_message = '*Please enter both passwords*';
}



//Forename check) 
if (empty($forename)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter a username
$forename_message = '*Please enter your forename*';
}

else if (ctype_digit($forename)) { 
   $error_stat = 1; 
   $forename_message .= '*Invalid forename*'; 
} 

$forename = $_POST['forename']; 
$forename = trim($forename); 

   if (strlen($forename) > 12){ 
   $error_stat = 1; 
   $forename_message = '*The forename must be 12 characters or less*'; 
}  




//Surname check) 
if (empty($surname)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter a username
$surname_message = '*Please enter your surname*';
}

else if (ctype_digit($surname)) { 
   $error_stat = 1; 
   $surname_message .= '*Invalid surname*'; 
}  

$surname = $_POST['surname']; 
$surname = trim($surname); 

   if (strlen($surname) > 12){ 
   $error_stat = 1; 
   $surname_message = '*The surname must be 12 characters or less*'; 
} 





//Email check) 
if (empty($email)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter an email address
$email_message = '*Please enter your email address*';
}

//Check format of email address entered
else if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email)){
$error_stat = 1; 		 
//Set the message to tell the user to enter a valid email address
$email_message = '*Invalid Email Address*';
}

if(emailTaken($email,$conn))
{
    $error_stat = 1;
    $email_message = '*Email is taken please choose another one*';
}

$email = $_POST['email']; 
$email = trim($email); 

   if (strlen($email) > 30){ 
   $error_stat = 1; 
   $email_message = '*The email address must be 30 characters or less*'; 
}  




//Mobile number check) 

if (empty($mobile)) {
//Set the error_stat to 1, which means that an error has occurred
$error_stat = 1;

//Set the message to tell the user to enter a dob
$mobile_message = '*Please enter your mobile number*';
}

else if (!ctype_digit($mobile)) { 
   $error_stat = 1; 
   $mobile_message .= '*The mobile phone number must be only numbers*'; 
}

if(mobileTaken($mobile,$conn))
{
    $error_stat = 1;
    $mobile_message = '*Mobile already in use, choose another one*';
}



$mobile = $_POST['mobile']; 
$mobile = trim($mobile); 

   if (strlen($mobile) > 11){ 
   $error_stat = 1; 
   $mobile_message = '*Invalid mobile number*'; 
}  
  

[revraz]

Do the same as the rest except use the checkbox name.

[thebadbad]

HTML:

<input type="checkbox" name="checkthis" />

 

PHP:

<?php
if($_POST['checkthis']) {
//it's checked; do something
} else {
//it's not checked, echo error message
}
?>

[PRodgers4284]

HTML:

<input type="checkbox" name="checkthis" />

 

PHP:

<?php
if($_POST['checkthis']) {
//it's checked; do something
} else {
//it's not checked, echo error message
}
?>

 

how could i check it if the checkbox is equal to "false" then output the error message?

[rhodesa]

What do you mean by "equal to false"? Not checked? If the checkbox isn't checked, it's not sent to the $_POST variable. So you shouldn't need to check it's value, rather just if it's set.

[PRodgers4284]

What do you mean by "equal to false"? Not checked? If the checkbox isn't checked, it's not sent to the $_POST variable. So you shouldn't need to check it's value, rather just if it's set.

 

If the checkbox is not checked when the submit button is clicked i would like an error to appear, im not posting the value of the check box to the database, i have terms and conditions option on my register form and i want the some validation to stop the form from being submitted if the checkbox is not checked.

 

Phil

[laffin]

if(!isset($_POST['mycheckbox']))
  die("Checkbox not checked");

 

if mucheckbox is not checked, than it wont be in the $_POST array.

 

so u check if it exists or not using isset function

[rhodesa]

That is a good server side check (which you definitely should have). But I would also add this to your form:

 

<input type="checkbox" name="terms" onclick="document.getElementById('formSubmit').disabled = (!this.checked);" /> 
Read Terms & Conditions<br />
<input type="submit" id="formSubmit" disabled=true />

[PRodgers4284]

if(!isset($_POST['mycheckbox']))
  die("Checkbox not checked");

 

if mucheckbox is not checked, than it wont be in the $_POST array.

 

so u check if it exists or not using isset function

 

I got it working, sorry i dont what i was doin there  

[PRodgers4284]

That is a good server side check (which you definitely should have). But I would also add this to your form:

 

<input type="checkbox" name="terms" onclick="document.getElementById('formSubmit').disabled = (!this.checked);" /> 
Read Terms & Conditions<br />
<input type="submit" id="formSubmit" disabled=true />

 

I got that working, im sorry i dont know what i was thinkin there, thanks for you help, really appreciate it.

 

Phil