Adding jQuery

Hey there..!

Really nice plugin, thanks for sharing it !

As you know, the less inline – the better..

Please check this out : )

Thank you and best regards

PHP Part inside your ajax.php

// Enqueue Script for Newsletter
if ( ! function_exists( 'epm_mailchimp_footer_js' ) )
{
	add_action( 'wp_enqueue_scripts', 'epm_mailchimp_footer_js' );
	function epm_mailchimp_footer_js()
	{
		wp_enqueue_script('newsletter-script', get_stylesheet_directory_uri() . '/js/newsletter.js', array('jquery'),'1.0', true);
		wp_localize_script('newsletter-script', 'epNewsletterVars', array(
				'ajaxURI' => admin_url('admin-ajax.php'),
				'successEvent' => do_action('epm_jquery_ajax_success_event')
			)
		);
	}
}

jQuery-Part inside childthemes js folder

jQuery(window).load(function() {
	jQuery('.epm-submit-chimp').click(function() {
alert(bbNewsletterVars.ajaxURI);
		//get form values
		var epm_form = jQuery(this);
		var epm_list_id = jQuery(epm_form).parent().find('#epm_list_id').val();
		var epm_firstname = jQuery(epm_form).parent().find('#epm-first-name').val();
		var epm_lastname = jQuery(epm_form).parent().find('#epm-last-name').val();
		var epm_email = jQuery(epm_form).parent().find('#epm-email').val();

		//change submit button text
		var submit_wait_text = jQuery(this).data('wait-text');
		var submit_orig_text = jQuery(this).val();
		jQuery(this).val(submit_wait_text);

		jQuery.ajax({
			type: 'POST',
			context: this,
			url: epNewsletterVars.ajaxURI,
			data: {
				action: 'epm_mailchimp_submit_to_list',
				epm_list_id: epm_list_id,
				epm_firstname: epm_firstname,
				epm_lastname: epm_lastname,
				epm_email: epm_email
			},
			success: function(data, textStatus, XMLHttpRequest){
				var epm_ajax_response = jQuery(data);
				jQuery(epm_form).parent().find('.epm-message').remove(); // remove existing messages on re-submission
				jQuery(epm_form).parent().prepend(epm_ajax_response);
				jQuery(epm_form).val(submit_orig_text); // restore submit button text
				epNewsletterVars.successEvent;
			},
			error: function(XMLHttpRequest, textStatus, errorThrown){
				alert('Something Went Wrong!');
			}
		});
		return false;

	});
});

https://www.ads-software.com/plugins/easy-peasy-mailchimp-ajax-form/