WP Feedburner Widget

gistfile1.php

// Place in your themes functions.php
// feedburner subscription form

add_action( 'widgets_init', 'custom_load_widgets' );

function custom_load_widgets() {
	register_widget( 'FB_subscribe' );
}

class FB_subscribe extends WP_Widget {

	// Widget setup.
	function FB_subscribe() {
		/* Widget settings. */
		$widget_ops = array( 'classname' => 'fb_subscribe', 'description' => __('Creates an email subscription form for Feedburner.', 'fb_subscribe') );

		/* Widget control settings. */
		$control_ops = array( 'id_base' => 'fb_subscribe-widget' );

		/* Create the widget. */
		$this->WP_Widget( 'fb_subscribe-widget', __('Feedburner Subscribe', 'fb_subscribe'), $widget_ops, $control_ops );
	}
	
	// How to display the widget on the screen.
	function widget( $args, $instance ) {
		extract( $args );

		/* Our variables from the widget settings. */
		$title = apply_filters('widget_title', $instance['title'] );
		$fb_id = $instance['fb_id'];

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

		/* Display the widget title if one was input (before and after defined by themes). */
		if ( $title )
			echo $before_title . $title . $after_title;

		/* Display name from widget settings if one was input. */
		if ( $fb_id )
			printf( __('
			<form action="http://feedburner.google.com/fb/a/mailverify" method="post" target="popupwindow" onsubmit="window.open(\'http://feedburner.google.com/fb/a/mailverify?uri=%1$s\', \'popupwindow\', \'scrollbars=yes,width=550,height=520\');return true">
			<input type="hidden" value="%1$s" name="uri"/>
			<input type="hidden" name="loc" value="en_US"/>
			<input type="text" name="email" />
			<input type="submit" id="searchsubmit" value="Subscribe" class="btn_search"  onmouseover="this.className=\'btn_search over\'" onmouseout="this.className=\'btn_search\'" />
			</form>', 'example'), $fb_id );

		/* After widget (defined by themes). */
		echo $after_widget;
	}
	
	// Update the widget settings.
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		/* Strip tags for title and name to remove HTML (important for text inputs). */
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['fb_id'] = strip_tags( $new_instance['fb_id'] );

		return $instance;
	}
	/**
	 * Displays the widget settings controls on the widget panel.
	 * Make use of the get_field_id() and get_field_name() function
	 * when creating your form elements. This handles the confusing stuff.
	 */
	function form( $instance ) {

		/* Set up some default widget settings. */
		$defaults = array( 'title' => __('Subscribe by Email', 'example'), 'fb_id' => __('', 'example'));
		$instance = wp_parse_args( (array) $instance, $defaults ); ?>

		<!-- Widget Title: Text Input -->
		<p>
			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e('Title:', 'hybrid'); ?></label>
			<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" style="width:100%;" />
		</p>

		<!-- Your Name: Text Input -->
		<p>
			<label for="<?php echo $this->get_field_id( 'fb_id' ); ?>"><?php _e('Feedburner ID:', 'example'); ?></label>
			<input id="<?php echo $this->get_field_id( 'fb_id' ); ?>" name="<?php echo $this->get_field_name( 'fb_id' ); ?>" value="<?php echo $instance['fb_id']; ?>" style="width:100%;" />
		</p>

	<?php
	}
}