WP Options API Custom Action After Form Submit - wordpress

Question

I'm sorry if this is an old question but I really can't find answer for this. I am new to wordpress plugin development. How can I do a somewhat like a callback before a form is submitted using WP Options API? In a native PHP, we can just say as
if (isset($_POST['submit'])) {
$options = $_POST['zt_ftp_settings'];
var_dump($options);
}
However, I am using the WP Options API. It saves the data correctly, I just want to do some more after saving the data.
Here is what I did,
<form method="post" action="options.php">
<?php
settings_fields('zt_ftp_settings_options' );
do_settings_sections( 'zt_ftp_settings_options' );
$option = get_option('zt_ftp_settings');
?>
<h2>FTP Settings</h2>
<p>Please provide your ftp credentials.</p>
<table class="form-table">
<tbody>
<tr>
<th scope="row">FTP Hostname</th>
<td>
<input name="zt_ftp_settings[zt_ftp_host_name]" type="text" id="zt_ftp_host_name" value="<?php echo $option['zt_ftp_host_name']?>" class="regular-text">
</td>
</tr>
<tr>
<th scope="row">FTP Username</th>
<td>
<input name="zt_ftp_settings[zt_ftp_user_name]" type="text" id="zt_ftp_user_name" value="<?php echo $option['zt_ftp_user_name']?>" class="regular-text">
</td>
</tr>
<tr>
<th scope="row">FTP Password</th>
<td>
<input name="zt_ftp_settings[zt_ftp_password]" type="password" id="zt_ftp_password" value="<?php echo $option['zt_ftp_password']?>" class="regular-text">
</td>
</tr>
</tbody>
</table>
<?php submit_button( 'Save Settings' ); ?>
Thanks.

Answer 1

Use WP AJAX functionality.
Use below JS,
$("#submit").click(function(){
var url = window.location.href;
jQuery.post(
ajaxurl,
{
'action': 'delete_search',
'tid': tid,
},
function(response){
location.reload();
});
});
Replace your submit button ID and use your form values.
Use below code in function.php
function prefix_ajax_delete_search() {
global $wpdb;
$user_id = get_current_user_id();
$wpdb->delete('sf_save_search', array('id' => $_POST['tid']) );
wp_die();
}
add_action( 'wp_ajax_delete_search', 'prefix_ajax_delete_search' );
As per your requirement change the function name and variables