Often, people confuse form validations with form security.Form security (preventing exploits like SQL injection, XSS attacks etc ) are to be handled in addition to form validation.Now, if you want to check whether the checkbox was checked within your php script upon submission, you do it like this: Now, how can that be exact same code?Pay close attention to "name" in your example and my example. My code is working great now, but once my page initially loads, the error for my checkbox shows. $agree = filter_input(INPUT_POST, 'term');$checked = ''; if( empty($agree) ) $errors['check'] = true;else Could anyone help me only show the error message when not checked and submitted.? I think, java script is best suited technique for check box validation because java script works on client machine side server load will be best option is java script. That is, $_POST[‘form Door’] won’t return a single string as in the example above; it will instead return an array consisting of all the values of the checkboxes that were checked.For instance, if I checked all the boxes, will not be set, so use the “empty” function to check for this case.You can set the value to be a ‘1’ or ‘on’ instead of ‘Yes’.
When you use the form data in an SQL query, it should be validated against SQL Injection.Using vanilla Java Script we can prevent form submission as follows: All this does is confirm before submitting the form that the checkbox is checked.If not, an alert is displayed and focus is moved to the checkbox.Hello, I'm making a contact form and I have PHP validation so that the user has to have something typed in every category, email validation, etc. My HTML/PHP looks like this: How Can I get it so that the user has to click the checkbox in order to agree to terms, and submit the form successfully. The validation by PHP is done AFTER the form is sent (server side) by the script the form sends its values to.If they don't check the box, I was the error message to show. So in case of errors, you'll have to send the form and the error messages back to the client (browser). if( empty($check) ) $errors['check'] = true; does anyone know how to prperly validate a checkbox so that the user has to check it off before submitting?? You cannot prohibit someone from pressing "submit" if checkbox isn't checked only by using PHP. Also, it seems you are working with quite an old example, as it seems that register_globals=on is assumed.