gistfile1.php

<?php

/*
Plugin Name: 1337 Date Picker
Plugin URI: http://1337datepicker.e1337geek.com
Description: A brief description of the Plugin.
Version: 1.0
Author: e1337geek
Author URI: http://e1337geek.com
License: GPL2
*/

add_action( 'widgets_init', 'datepicker_load' ); /* Add our function to the widgets_init hook. */
add_action( 'wp_enqueue_scripts', 'datepickerwidget_enqueue_scripts');
add_action( 'admin_enqueue_scripts', 'datepickerwidget_enqueue_scripts');
function datepicker_load() { register_widget( 'datepickerwidget' ); } /* Function that registers our widget. */

function datepickerwidget_enqueue_scripts() {
    wp_enqueue_script('jquery-ui-datepicker');
    wp_enqueue_style('jquery-ui-css', 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/smoothness/jquery-ui.css');
}

class datepickerwidget extends WP_Widget {

    function datepickerwidget() {
        $widget_ops = array( 'classname' => 'datepickerwidget', 'description' => 'date picker widget' ); /* Widget settings. */
        $control_ops = array( 'id_base' => 'datepickerwidget' ); /* Widget control settings. */
        $this->WP_Widget( 'datepickerwidget', 'Date Picker Widget', $widget_ops, $control_ops ); /* Create the widget. */
    }

    function widget( $args, $instance ) {
        extract( $args );

        echo $before_widget; /* Before widget (defined by themes). */

        if ( $instance['title'] ) echo $before_title . $instance['title'] . $after_title; /* Title of widget (before and after defined by themes). */

        

        echo '<ul>';
        foreach($instance as $name=>$value) {
            if ($name == 'title') continue;
            echo '<li>' . $name . ': ' . $value . '</li>';
        }
        echo '</ul>';

        echo $after_widget; /* After widget (defined by themes). */
    }

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;

        foreach($new_instance as $k=>$v) { $instance[$k] = strip_tags($v); } /* Strip tags (if needed) and update the widget settings. */

        return $instance;
    }

    function form( $instance ) {

        /* Set up some default widget settings. */

        $defaults = array('title' => 'Date Selector', 'datemask' => 'MM-DD-YYYY', 'defaultdate' => '01-01-2016');

        $instance = wp_parse_args( (array) $instance, $defaults );

        $datemask = "";


        foreach($instance as $name=>$value) {
            if ($name == 'datemask') {
                $datemask = $value;
            }
        }

        echo '<p><label for="'.$this->get_field_id( 'title' ).'">'. 'Title'.'</label><br />
                                        <input type="text" id="'. $this->get_field_id( 'title' ).'" name="'.$this->get_field_name( 'title' ).'" value="'.$instance['title'].'" /></p>';

        echo '<p><label for="'.$this->get_field_id( 'datemask' ).'">'. 'Date Format'.'</label><br />
                                        <input type="text" id="'. $this->get_field_id( 'datemask' ).'" name="'.$this->get_field_name( 'datemask' ).'" value="'.$instance['datemask'].'" /></p>';

        echo '<p><label for="'.$this->get_field_id( 'defaultdate' ).'">'. 'Default Date'.'</label><br />
                                        <input type="text" class="datefield" id="'. $this->get_field_id( 'defaultdate' ).'" name="'.$this->get_field_name( 'defaultdate' ).'" value="'.$instance['defaultdate'].'" />
                                            <script type="text/javascript">jQuery(document).ready(function() {jQuery(\'.datefield\').datepicker({dateFormat : \''. $datemask .'\'});});</script><br />
                                            ('.$datemask.')</p>';                                        

    } //end function

} //end class

?>