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I've created widget by simple copying one of the default widgets class and modifying it.
The strange thing is in the widgets admin area, this widget is not shown. When I searched the page source code the widget was there but it had inline style display:none;.
The other weird thing is that the title filed is not shown either!
Here is my widget code:

/**
 * Mood widget class
 *
**/
class WP_Widget_Mood extends WP_Widget {

    function __construct() {
        $widget_ops = array('classname' => 'widget_mood', 'description' => __( "Mood widget") );
        parent::__construct('mood', __('Mood'), $widget_ops);
    }

    function widget($args, $instance){
        extract($args);
        $title = apply_filters('widget_title', empty($instance['title']) ? 'Mood' : $instance['title'], $instance, $this->id_base ); 

        $user_id = get_current_user_id();

        $table_name = $wpdb->prefix . "mood";

        $get_same=$wpdb->get_row("SELECT * FROM $table_name where user_id='".$user_id."' order by id desc");
        $get_mood_row = mysql_query("select * from wp_mood where user_id='".$user_id."' and mood='".$get_same->mood."'");
        $pathredirect = get_bloginfo('url').'/m/'.$current_user->user_nicename.'/settings/mood/';
        global $current_user;
        $current_user = wp_get_current_user();

        ?>
        <h3 class="sideheading"><?php echo $title; ?></h3>
        <dl id="settingss" class="dropdown3">
            <dt>
                <a title="Options" href="#setting">
                    <div id="rightsetting" class="sprite"></div>
                </a>
            </dt>
            <dd>
                <ul>
                    <li><p id="wlcmstg2" class="sprite"></p><a href="#Make">Make</a></li>
                    <li><p id="wlcmstg1" class="sprite"></p><a href="<?php echo $pathredirect;?>">Setting</a></li>
                </ul>
            </dd>
        </dl>

        <div id="charectersbar">
            <div id="prev"><span id="go-prev2" class="sprite"> </span></div><!--#prev-->
            <div id="slide">
                <div id="slider2">
                    <?php
                        //echo "select * from wp_mood where user_id!='".$user_id."' and mood='".$get_same->mood."'";
                        $res_mood = mysql_query("select * from wp_mood where user_id='".$user_id."' and mood='".$get_same->mood."'");
                        $ii=0;
                        while($result_mood = mysql_fetch_array($res_mood)){
                            $ii++;
                            $uuserid = $result_mood['user_id'];
                            $user_info = get_userdata($uuserid);
                            ?>
                            <div>
                                <a href="<?php echo bloginfo('url');?>/m/<?php echo $current_user->user_nicename; ?>/profile">
                                    <img title="<?php echo $result_mood['nikename'];?>" src="<?php echo bloginfo('url').'/wp-content/uploads/mood/'.$result_mood['image'];?>" /><?php echo $result_mood['nikename'];?>
                                </a> 
                            </div>

                    <?php } ?>
                </div><!--#slider2-->
            </div><!--#slide-->
            <div id="next">
                <span id="go-next2" class="sprite"></span>
            </div>
        </div><!--#charectersbar-->
        <?php
    }

    function form( $instance ) {
        $instance = wp_parse_args( (array) $instance, array( 'title' => '') );
        $title = $instance['title'];
?>
        <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?> <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" /></label></p>
<?php
    }

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $new_instance = wp_parse_args((array) $new_instance, array( 'title' => ''));
        $instance['title'] = strip_tags($new_instance['title']);
        return $instance;
    }

}
function mytheme_register_widgets()
    register_widget( 'WP_Widget_Mood' );
}

add_action( 'widgets_init', 'mytheme_register_widgets' );
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1 Answer

I am not seeing you registering the widget in this code.

For inside of a theme: register_widget('WP_Widget_Mood');

For inside of a plugin: add_action( 'widgets_init', create_function('', 'return register_widget("WP_Widget_Mood");') );

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Yes, I do register the widget. The mentioned widget along with 2 other widgets. I updated the code. But that's not really my problem. –  Hamed Momeni Jul 2 '12 at 17:11
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