WordPress ajax cannot get it to work always returns 0

hello everyone ??

I am learning Ajax first time with WordPress. I am implementing Ajax functionality with widget but I am getting 0 after form is submit.

Can you guide me and explain why this is happening so i can understand better.

My Code:

wp_enqueue_script('jquery');

/**
 * Add function to widgets_init that'll load our widget.
 * @since 0.1
 */
add_action( 'widgets_init', 'example_load_widgets' );

/**
 * Register our widget.
 * 'Example_Widget' is the widget class used below.
 *
 * @since 0.1
 */
function example_load_widgets() {
	register_widget( 'Example_Widget' );
}

/**
 * Example Widget class.
 * This class handles everything that needs to be handled with the widget:
 * the settings, form, display, and update.  Nice!
 *
 * @since 0.1
 */
class Example_Widget extends WP_Widget {

	/**
	 * Widget setup.
	 */
	function Example_Widget() {
		/* Widget settings. */
		$widget_ops = array( 'classname' => 'example', 'description' => __('An example widget that displays a person\'s name and sex.', 'example') );

		/* Widget control settings. */
		$control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'example-widget' );

		/* Create the widget. */
		$this->WP_Widget( 'example-widget', __('Example Widget', 'example'), $widget_ops, $control_ops );
	}

	/**
	 * How to display the widget on the screen.
	 */
	function widget() {
			echo $name = $_POST['name'];
			?>
            <form type="post" action="" id="newCustomerForm">

				<label for="name">Name:</label>
                <input name="name" type="text" />

                <input type="hidden" name="action" value="example_load_widgets"/>
                <input type="submit" name="submit" value="Submit">
            </form>
            <br/><br/>
            <div id="feedback"></div>
            <br/><br/>

			<script type="text/javascript">
                jQuery('#newCustomerForm').submit(ajaxSubmit);

                function ajaxSubmit(){

                	var newCustomerForm = jQuery(this).serialize();

                    jQuery.ajax({
						type:"POST",
						url: "https://localhost/testing/wordpress/wp-admin/admin-ajax.php",
						data: newCustomerForm,
						success:function(data){
	                        jQuery("#feedback").html(data);
                        },
    	                error: function(errorThrown){
        	                alert(errorThrown);
            	        }
					});

                    return false;
                }
            </script>

        	<?php
			add_action('wp_ajax_example_load_widgets', 'example_load_widgets');
			add_action('wp_ajax_nopriv_example_load_widgets', 'example_load_widgets');
			exit();
		}
	}

Thanks ??