Example of an Ajaxified WordPress Admin using OOP Style

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class Td_Admin {

public function __construct() {
add_action('admin_menu', array($this, 'cvf_td_register_site_options') );
add_action('wp_ajax_cvf_td_update_trade_settings', array($this, 'cvf_td_update_trade_settings') );
add_action('admin_enqueue_scripts', array($this, 'cvf_td_load_admin_scripts') );
}

public static function cvf_td_load_admin_scripts() {

wp_enqueue_style( 'admin-css', get_template_directory_uri() . '/css/admin.css', false, "1.1.1", false);
}

public static function cvf_td_register_site_options() {
add_submenu_page( 'edit.php?post_type=page', 'Settings', 'Settings', 'administrator', 'trade-settings', 'Td_Admin::cvf_td_trade_settings' );
}

public static function cvf_td_trade_settings(){
?>
<h2>Wp Trade Settings</h2>
<span class = "update-trade-settings-response td-response"></span>
<table class="form-table">
<tbody>
<tr>
<th><label for="limit_repost">Items can be reposted after:</label></th>
<td><input type="text" name="limit_repost" id="limit_repost" value="<?php echo get_option('td_limit_repost'); ?>" placeholder = "" class="regular-text"> <span class="description">Specify in hours, Default is: 24</span></td>
</tr>
<tr>
<th><label for="max_image_upload">Maximum Image Upload</label></th>
<td><input type="text" name="max_image_upload" id="first_name" value="<?php echo get_option('td_max_image_upload'); ?>" class="regular-text"></td>
</tr>
<tr>
<th><label for="max_image_size">Maximum Image Size</label></th>
<td><input type="text" name="max_image_size" id="max_image_size" value="<?php echo get_option('td_max_image_size'); ?>" class="regular-text"><span class="description">Specify in kilobytes, Default is: 500</span></td>
</tr>
<tr>
<th><label for="currency_symbol">Currency Symbol</label></th>
<td>
<select name="currency_symbol" class = "currency_symbol">
<option value = "dollar">$ Dollar</option>
<option value = "euro">€ Euro</option>
<option value = "pound">£ Pound</option>
<option value = "yen">¥ Yen</option>
<option value = "peso">₱ Peso</option>
</select>
</td>
</tr>
<tr>
<th><label for="currency_symbol">Editor</label></th>
<td>
<?php
$content = '';
$editor_id = 'mycustomeditor';
wp_editor( $content, $editor_id );
?>
</td>
</tr>
</tbody>
</table>

<p class="submit"><input type="submit" name="submit" id="submit" class="button button-primary update_wp_trade_settings" value="Update Settings"></p>

<script type="text/javascript">
jQuery(document).ready(function($) {

var current_currency = '<?php echo get_option('td_currency_symbol'); ?>';
if(current_currency){
$(".currency_symbol").val(current_currency);
}

$('input').on('focus', function(){
$('input').removeClass('border-red');
});

$("body").on("click", ".update_wp_trade_settings", function(e) {
e.preventDefault();

if(!$("input[name=limit_repost]").val()) {
$("input[name=limit_repost]").addClass('border-red');
} else if(!$("input[name=max_image_upload]").val()) {
$("input[name=max_image_upload]").addClass('border-red');
} else if(!$("input[name=max_image_size]").val()) {
$("input[name=max_image_size]").addClass('border-red');
} else {

$(".update-trade-settings-response").html('<p><img src = "<?php bloginfo('template_url'); ?>/images/loading.gif" class = "loader" /></p>');
var data = {
'action': 'cvf_td_update_trade_settings',
'cvf_action': 'update_trade_settings',
'limit_repost': $("input[name=limit_repost]").val(),
'max_image_upload': $("input[name=max_image_upload]").val(),
'max_image_size': $("input[name=max_image_size]").val(),
'currency_symbol': $(".currency_symbol").val(),
'text_area_text': tinymce.editors.mycustomeditor.getContent()
};

$.post(ajaxurl, data, function(response) {
element = $(".update-trade-settings-response");
$('html, body').animate({scrollTop: $(element).offset().top-100}, 150);
$(element).html(response);
});
}
});
});
</script>
<?php

}

public static function cvf_td_update_trade_settings(){

$errors = array();
$currency_list = array('dollar', 'euro', 'pound', 'yen', 'peso');

if(isset($_POST['cvf_action']) && $_POST['cvf_action'] == 'update_trade_settings'){

foreach($_POST as $k => $value){
$_POST[$k] = sanitize_text_field($value);
}

if (empty($errors) === true) {

if(!is_numeric($_POST['limit_repost'])){
$errors[] = 'Only numeric values are allowed in "Items can be reposted after"';
} elseif ($_POST['limit_repost'] < 0) {
$errors[] = 'Repost limit cannot be negative';
}

if(!is_numeric($_POST['max_image_upload'])){
$errors[] = 'Only numeric values are allowed in "Maximum Image Upload"';
} elseif ($_POST['max_image_upload'] < 0) {
$errors[] = 'Maximum Image Upload cannot be negative';
}

if(!is_numeric($_POST['max_image_size'])){
$errors[] = 'Only numeric values are allowed in "Maximum Image Size"';
} elseif ($_POST['max_image_size'] < 10) {
$errors[] = '"Maximum Image Upload" must be greater than 10kb';
}

if(!in_array($_POST['currency_symbol'], $currency_list)){
$errors[] = 'Invalid Currency Symbol.';
}
}

if(empty($_POST) === false && empty($errors) === true) {

update_option('td_limit_repost', $_POST['limit_repost']);
update_option('td_max_image_upload', $_POST['max_image_upload']);
update_option('td_max_image_size', $_POST['max_image_size']);
update_option('td_currency_symbol', $_POST['currency_symbol']);
update_option('td_text_area_text', $_POST['text_area_text']);

echo '
<div id="message" class="updated">
<p><strong>Settings updated.</strong></p>
</div>';

} elseif (empty($errors) === false) {
echo '
<div id="message" class="error">
<ul>';
foreach ($errors as $error) {
echo '<li><strong>' . $error . '</strong></li>';
}
echo '</ul>
</div>';

}
}

exit();
}

} new Td_Admin();

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