Checkbox clicked Not required

[siabanie]

Hi all,

I wonder if anyone could give me some idea: I have a form and one of the filed is an email (must field) if empty an error message will show up: - Now I want to add a CHECKBOX where when the CHECKBPX is clicked the "must field" email will become" not must field one" (Not required field).

I have this code as my snippets:

<form action="<?php echo $PHP_SELF;?>" method="post" name="reg1">
..
<tr>
<td><input name="noemail" type="checkbox" value="noemail">
 Do not want to get the E-mail address</td>
</tr>
														<tr>
	<td nowrap>Enter email 
<input name="email1" type="text" <?php if ($_POST['action'] == "register") { echo 'value="'.$_POST['email1'].'"'; } ?>>
   </td>
</tr>
..
</form>

..
..
$error = 0; 
$errormsg = "";
..
..
if ($_POST['action'] == "register") {

if (($_POST['email1'] == "") OR (!check_text($_POST['email1']))) {
	$error = 1;
	$errormsg .= "Please enter your requested email address<br>";
	$errornum[3] = 1;
    }
}
..

Can anyone assist me what shall I add so I can achieve this please?

Thanks in advance.
Siabanie

[Ashley_Sheridan]

First, it's best practice to see if your $_POST variables actually exist before trying to use their values. Use the isset() function for this:

if (isset($_POST['action']) && $_POST['action'] == "register")

Onto your question, I'm not exactly sure what you want, but I think it's this: You want to give an error message if they tick the checkbox and fill in the email field? So basically, the checkbox ticked means leave the email blank.

What about this (untested):

if(isset($_POST['email1']) && (strlen($_POST['email1']) || (isset($_POST['noemail']) && !strlen($_POST['email1'])) ) )

[siabanie]

Thanks Ashley Sheridan,

Yes what I mean was:

When they clicked the checkbox it means: the fields are not mandatory - but if they leave the checkbox unchecked means it needs to be fields.

By the way, what is the function you use here

strlen

At the moment what you implying is; if they checked the box means need to fill - but if the checked box is unchecked mean not required.

Any ideas?

[Ashley_Sheridan]

strlen() returns the number of characters in a string (easily found with Google). In PHP, a 0 equates to false, so you don't need to check if strlen() != 0, just check the value returned. Positive is trye, 0 is false. Beware of values returned on non-strings though. As $_POST variables are always strings, and you expect it in a string-like format, it's fine to use here.

The statement I've given will be true if the email is filled and the checkbox is ticked. If the checkbox is ticked, you should not enter a value.

Sometimes it can be easier to break this sort of logic down into a flowchart on paper, and then run through each bit to see if you end at the right place. Then just convert that flowchart logic into something that you can use in PHP with a bunch of if statements.

[siabanie]

Ashley Sheridan;10986441 wrote:

strlen() returns the number of characters in a string (easily found with Google). In PHP, a 0 equates to false, so you don't need to check if strlen() != 0, just check the value returned. Positive is trye, 0 is false. Beware of values returned on non-strings though. As $_POST variables are always strings, and you expect it in a string-like format, it's fine to use here.

The statement I've given will be true if the email is filled and the checkbox is ticked. If the checkbox is ticked, you should not enter a value.

Thanks Ashley Sheridan,

So if I want do as if they ticks the box they do not have to fill in the email address (no error message will show) and if they NOT ticks the box means fill in the emails (error message will show if they leave the fields blank)

Can I do this instead?

if(isset($_POST['email1']) || (strlen($_POST['email1']) && (isset($_POST['noemail']) || !strlen($_POST['email1'])) ) ) 

[siabanie]

I tried like this: as if user ticks box, they do not have to fill in the email address and if the box is tick means they have to fill in the email address:

..
if (($_POST['email1'] == "") || (!check_text($_POST['email1']) && ($_POST['noemail'] == "y"))) {
..

<form action="<?php echo $PHP_SELF;?>" method="post" name="reg1">
..
<tr>
<td><input name="noemail" type="checkbox" value="y">
 Do not want to get the E-mail address</td>
</tr>
														<tr>
	<td nowrap>Enter email 
<input name="email1" type="text" <?php if ($_POST['action'] == "register") { echo 'value="'.$_POST['email1'].'"'; } ?>>
   </td>
</tr>
..
</form>

...but it did not work.. Anyone can assist me please?