提交后需要帮助添加电子邮件验证和隐藏表单

Question

I am new to PHP and am having trouble with adding email validation and then hiding the form after pressing the submit button. I have an error.php, thankyou.php and formmail.php. The PHP code below is that of formmail.php. I just don't know what to write for email validation for this specific code. I've tried copying some PHP codes from other sites but it just doesn't match up with my code. And as far as hiding the form after submit, I really don't know what to do with that.

Here is my HTML:

    <div id="contact">
        <div id="contact-left">
        <form id="ajaxsubmit" action="formmail.php" method="post">
<div class="form">
    <div class="formblock">
    <h2>Name</h2>
    <input name="name" type="text" class="required txt" id="name" />
    </div>
    <div class="formblock">
    <h2>Email</h2>
    <input name="email" class="required txt" type="text" id="email" />
    </div>
    <div class="formblock">
    <h2>Message</h2>
    <textarea name="comments" cols="" rows="" id="comments"></textarea>
    </div>
    <input name="Submit" type="submit" class="subbtn" value="Submit"  />
    <div id="message"></div>
    </form>
        </div>
    </div>

Here is my PHP:

    <?php
// Insert your email/web addresses and correct paths
$mailto = '[e-mail]' ;
$from = "http://website.com" ;
$formurl = "http://website.com/formmail.php" ;
$errorurl = "http://website.com/error.php" ;
$thankyouurl = "http://website.com/thankyou.php" ;

// Place Your Form info here...
$firstname = ($_POST['name']);
$email_from = ($_POST['email']);
$comments = ($_POST['comments']);

// Check If Empty
if (empty($firstname)) {
   header( "Location: $errorurl" );
   exit ;
}
// Add more Validation/Cleaning here...


// Place your Corresponding info here...
$message =

    "Name: $firstname

" .
    "Email: $email_from

" .
    "Comment: $comments

"
;

// Leave Alone
mail($mailto, $from, $message,
    "From: \"$name\" <$email>" . $headersep . "Reply-To: \"$name\" <$email>" . $headersep );
header( "Location: $thankyouurl" );
exit ;

?>

Please let me know if you can assist me or need any other information from my html. Thanks in advance!

Answer 1

To validate email in php, follow this link,

if (filter_var($email_from, FILTER_VALIDATE_EMAIL)) {
    echo "This ($email_from) email address is considered valid.";
}

To hide the form, using jquery,

$(document).on('submit', '#ajaxsubmit',function(){
   $(this).hide();
});

or using pure javascript,

Change HTML,

<form id="ajaxsubmit" action="formmail.php" method="post" onsubmit="myFunction()">

and JS

function myFunction(){
    var form = document.getElementById("ajaxsubmit");
    form.style.display = 'none';
}