how to submit a checkbox

[Paul-D]

Hi I have added a checkbox to a for [Bold]

When submitted to the update php I get 

echo $Bold;

On if it is ticked and 

Warning: Undefined array key "Bold" in /vhost/d/e/s/desmond-otoole.co.uk/www/bank2/StatementEntryUpdate.php on line 31

if it is not. Can someone help please.

<code

        if($direction == "Update")
        {
        $SE_MyReason = $_POST['Reason']; // Keep the default regardless
        $SE_Money_In = $_POST['MoneyIn'];
        $SE_Money_Out = $_POST['MoneyOut'];
        $SE_DD_Entry = $_POST['DD_Entry'];
        $SE_MM_Entry = $_POST['MM_Entry'];
        $SE_YYYY_Entry = $_POST['YYYY_Entry'];
        $Comment = $_POST['Comment'];  
        $Bold = $_POST['Bold'];          <--- Line 31
        
        echo $Bold; 
        exit;

</code>

 

[Barand]

Unchecked checkboxes are not posted.

I prefer to use a the null coalescing operator (??) when handling checkboxes EG

$Bold = $_POST['Bold'] ?? 0;           //if not set, default to '0'

 

[Paul-D]

I used if set = 1 else 0.

Posted returns 'On'' not a 1.

Thanks.

 

[dodgeitorelse3]

That's because if it is set it is using the value from your form input. 

Edited August 1 by dodgeitorelse3
Typo

[gizmola]

11 hours ago, Paul-D said:

I used if set = 1 else 0.

Posted returns 'On'' not a 1.

Thanks.

 

Yes, this is based on the value property of the checkbox.  

The important concept to remember is what Barand described:  an unchecked checkbox will not exist in the $_POST.  This is why Barand's code to utilize the null coalesce operator is generally speaking a best practice in PHP form handling where checkboxes are involved.