Sending a simple string to PHP using javascript prompt [closed]

Question

I have a simple function in my php file mean to collect emails and send them to a database.

function add_Email_to_MarketingList()
{
    global $wpdb;
    $mail = $_POST['market'];
    $wpdb->insert('wp_marketing_emails', array('email'=>$mail));
    die();
}

What javascript ajax call would i need to write to get this to work? right now the only thing i have up to is this

var mail = prompt("Exciting things to come, Sign up for our email list!!!");

Answer 1

Probably, an AJAX request is what you need.

Assuming you`re using JQuery:

var mail = prompt("Exciting things to come, Sign up for our email list!!!");

$.post( "url_to_your_php_file", { "market":mail }, function( data ) {

    if(data == true)
        alert('Success!');
    else
        alert('Ooops! Try again later.');
});

You should update your PHP file to have the following code:

function add_Email_to_MarketingList($mail)
{
    global $wpdb;

    if($wpdb->insert('wp_marketing_emails', array('email' => $mail)))
        return true;

    return false;
}

add_Email_to_MarketingList($_POST['market']);

exit();

Also, you should use $_SERVER['HTTP_X_REQUESTED_WITH'] in PHP to detect any AJAX request. Your code would only work with AJAX requests and any direct access to the file would be denied.

if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
    /* AJAX Here */
}
else {
    die('No direct access allowed.');
}

I would also use Validation FILTERS and filter_var to check the e-mail. Never trust outside input.

Answer 2

Say you are using a JS framework like jQuery, you would utilize the $.ajax() or $.post() function. See http://api.jquery.com/jQuery.post for examples. You need to specify the URL of the PHP page/script that contains the aforementioned function in the Ajax call. You should be doing a POST, since you are sending a non-idempotent request (inserting into a database).