EDD checkout form - move login form to checkout cart (custom)

file.php

<?php // DO NOT COPY THIS LINE

// PLEASE READ ALL COMMENTS

/**
 * This is being provide as-is directly from a custom implementation I built for the checkout form on easydigitaldownloads.com.
 * It's not just this part that is custom. I made various changes to the entire checkout cart, form, and behavior. So context
 * matters. The code below is specific to repositioning the login form, putting it behind a toggle link, and making sure the
 * form still submits via AJAX. While this will get you most of the way, you'll have to make tweaks based on your own code.
 *
 * This customization involves PHP, JS, and CSS. Copy the code into the appropriate files, then work from there.
 */


/**
 * PHP
 *
 * Markup/structure changes to be placed in functions (or similar) file
 */

// Remove the login form from the purchase form
remove_action( 'edd_purchase_form_login_fields', 'edd_get_login_fields' );

// Add link to be used to toggle the display of the login form
function eddwp_checkout_login_toggle() {
	$show_login_form = edd_get_option( 'show_register_form', 'none' );
	if ( ! is_user_logged_in() && ( 'login' === $show_login_form || 'both' === $show_login_form ) ) {
		?>

		<div class="edd-show-login-wrap">
			<p id="edd-show-login">
				<span class="edd-checkout-login-title">Are you already a customer?</span>
				<span class="edd-checkout-login-toggle"><a href="#" class="edd-checkout-show-login-form">Log into your account.</a></span>
			</p>
		</div>

		<?php
	}
}
add_action( 'edd_before_purchase_form', 'eddwp_checkout_login_toggle', 11 );

// Add login form above the purchase form
add_action( 'edd_before_purchase_form', 'edd_get_login_fields', 12 );


/**
 * JS
 * 
 * JS needed for the toggle functionality and so the login form can use AJAX
 */

// Checkout form login toggle
$('.edd-checkout-show-login-form').on('click',function(e){
	e.preventDefault();
	$(this).parents( ".edd-show-login-wrap" ).siblings( "#edd_login_fields" ).toggle();
	$( "#edd_login_fields #edd_user_login" ).focus();
});

// Process the login form via ajax
// Adjusted from EDD core because the login form has been moved
$body.on('click', '#edd_checkout_wrap #edd_login_fields input[type=submit]', function(e) {

	e.preventDefault();

	var complete_purchase_val = $(this).val();

	$(this).val(edd_global_vars.purchase_loading);

	$(this).after('<span class="edd-loading-ajax edd-loading"></span>');

	var data = {
		action : 'edd_process_checkout_login',
		edd_ajax : 1,
		edd_user_login : $('#edd_login_fields #edd_user_login').val(),
		edd_user_pass : $('#edd_login_fields #edd_user_pass').val(),
		edd_login_nonce : $('#edd_login_nonce').val(),
	};

	$.post(edd_global_vars.ajaxurl, data, function(data) {

		if ( $.trim(data) == 'success' ) {
			$('.edd_errors').remove();
			window.location = edd_scripts.checkout_page;
		} else {
			$('#edd_login_fields input[type=submit]').val(complete_purchase_val);
			$('.edd-loading-ajax').remove();
			$('.edd_errors').remove();
			$('#edd-user-login-submit').before(data);
		}
	});

});


/**
 * CSS
 * 
 * Hide the login form by default so the toggle can open it
 */

// Hide the login form
#edd_login_fields {
	display: none;
}