Notepad sticky plugin - php

Question

I have this following code to give a textarea to a front end user to use it as notes on a page to write things to remember. But this code saves only one sticky note that can be edited whenever the user wants. My questions is if there is a way to save the content somewhere and have a new one every time submit is pressed. or a add new sticky button.
require_once( plugin_dir_path( __FILE__ ) . 'wp-ajax.php' );
class notepad_stikey extends WP_Ajax {
var $user;
var $username;
function __construct() {
parent::__construct();
add_action('init', array( &$this, 'setup') );
}
function setup() {
$this->user = get_current_user_id();
$this->username = get_userdata( $this->user )->user_login;
$this->notes = get_user_meta( $this->user, 'notepad_stikey', true );
$this->ph = ' '; //placeholder
if (empty( $this->notes )) {
$this->notes = $this->ph;
}
add_action('wp_enqueue_scripts', array( &$this, 'scripts') );
}
function scripts() {
wp_enqueue_script( 'notepad_stikey', plugins_url( 'notepad_stikey.js', __FILE__ ), array( 'jquery' ) );
wp_localize_script( 'notepad_stikey', 'notepad_stikey', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );
}
function an_change_notepad_stikey() {
$notes = trim( $_POST['notes'] );
//if notes is empty, delete
if ( empty($notes) ) {
if ( delete_user_meta( $this->user, 'notepad_stikey' ) )
die( 'notes deleted' );
}
//notes are the same, notes = placeholder, or resaving empty notes
if ( $notes == $this->notes || $notes == $this->ph || ( empty($notes) && $this->notes == $this->ph) )
die();
//update
if ( update_user_meta( $this->user, 'notepad_stikey', $notes ) )
die( 'updated' );
//hopefully, we don't get this far. if we do, something is wrong
die( 'uh oh. notes could not be saved' );
}
}
global $notepad_stikey;
$notepad_stikey = new notepad_stikey();
add_action( 'widgets_init', 'notepad_stikey_load' );
function notepad_stikey_load() {
register_widget( 'notepad_stikey_Widget' );
}
class notepad_stikey_Widget extends WP_Widget {
function notepad_stikey_Widget() {
$widget_ops = array('classname' => 'notepad_stikey', 'description' => __( 'notepad_stikey. Only one instance please. Else this will break.', 'notepad_stikey' ) );
$control_ops = array( 'id_base' => 'notepad_stikey' );
parent::WP_Widget( 'notepad_stikey', __( 'notepad_stikey', 'notepad_stikey' ), $widget_ops, $control_ops );
}
function widget( $args, $instance ) {
extract( $args, EXTR_SKIP );
echo $before_widget;
global $notepad_stikey;
$username = $notepad_stikey->username;
$notes = $notepad_stikey->notes;
//overwrite title
$instance['title'] = 'Notepad for '. $username;
echo $instance['hide_title'] ? '' : $before_title . $instance['title'] . $after_title;
echo "<div id='notepad_stikey' class='$username' style='border: 1px solid #eee; padding: 10px 15px;min-height: 100px;'>";
echo $notes;
echo '</div><span style="float:left;color:#008;" id="notepad_stikey_response"></span><small style="float:right;">click box above to edit</small>';
echo $after_widget;
} //end widget()
function update($new_instance, $old_instance) {
$instance = $old_instance;
$instance['title'] = esc_attr( $new_instance['title'] );
$instance['hide_title'] = (bool) $new_instance['hide_title'] ? 1 : 0;
return $instance;
} //end update()
function form( $instance ) {
$instance = wp_parse_args( (array) $instance, array( 'hide_title' => 0 ) );
extract( $instance );
?>
<p>
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hide_title'); ?>" name="<?php echo $this->get_field_name('hide_title'); ?>"<?php checked( $hide_title ); ?> />
<label for="<?php echo $this->get_field_id('hide_title'); ?>"><?php _e('Hide Title?', 'notepad_stikey' );?></label>
</p>
<?php
} //end form()
}
if (!class_exists('WP_Ajax')) {
class WP_Ajax {
function __construct( $ajax_prefix = 'a', $nopriv_prefix = 'n' ) {
$regex = "/^($ajax_prefix)?($nopriv_prefix)?_|^($nopriv_prefix)? ($ajax_prefix)?_/";
$methods = get_class_methods( $this );
foreach ( $methods as $method ) {
if ( preg_match( $regex, $method, $matches ) ) {
if ( count( $matches ) > 1 ) {
$action = preg_replace( $regex, '', $method );
if ( count( $matches ) == 3 ) {
add_action( "wp_ajax_$action", array( $this, $method ) );
add_action( "wp_ajax_nopriv_$action", array( $this, $method ) );
} else {
if ( $matches[1] == $ajax_prefix ) {
add_action( "wp_ajax_$action", array( $this, $method ) );
} else {
add_action( "wp_ajax_nopriv_$action", array( $this, $method ) );
}
}
}
}
}
}
}
}
jQuery(document).ready(function($) {
$('#notepad_stikey').click(function(e) {
tag = e.target.tagName;
if ( tag != 'TEXTAREA' && tag != 'INPUT' ) {
contents = $(this).html();
$(this).html( '<textarea rows="5" cols="50" style="display:block;width:98%;height:100px;">' + contents + '</textarea><input type="submit" class="save" style="position:relative;z-index:99" />' );
}
});
$('#notepad_stikey input.save').live( 'click', function() {
new_contents = $(this).siblings('textarea').val();
$('#notepad_stikey').html( new_contents );
change_notepad_stikey( new_contents );
return false;
});
function change_notepad_stikey( notes ) {
$('#notepad_stikey_response').text( '...' );
$.post(notepad_stikey.ajaxurl,
{
'action' : 'change_notepad_stikey',
'notes' : notes
}, function(response) {
//if (response != '') {
//alert( response );
$('#notepad_stikey_response').text( response );
//}
}, 'text' );
}
});