GravityView - Show Next/Prev Entry Navigation

gravityview-next-prev-entry-nav.php

<?php
/**
 * ::WARNING:: 
 * This is an early work-in-progress!
 *
 * There are known issues, namely: This works only with no search values for now. 
 * It supports sorting, but that's pretty much it. It hasn't been thoroughly tested!
 * Use at your own risk.
 *
 * @license GPL-2.0+
 */

// If you want to not show before the entry details, add # to the beginning of the next line.
add_action( 'gravityview/template/before', 'gk_gravityview_entry_nav' );

// If you want to show after the entry details, remove the # from the beginning of the next line.
# add_action( 'gravityview/template/after', 'gk_gravityview_entry_nav' );

/**
 * Display navigation to next/previous entry when applicable.
 *
 * @param \GV\Template_Context $context The context.
 */
function gk_gravityview_entry_nav( \GV\Template_Context $context ) {

	if ( ! gravityview()->request->is_entry() ) {
		return;
	}

	/** @var \GV\View $view */
	$view = $context->view;
	
	// Handle pagination. For now, we need to load all entries.
	// This is massively inefficient but we'll improve this soon.
	$view->settings->set( 'page_size', -1 );

	$all_entries = $view->get_entries()->all();
	$entry_count = $view->get_entries()->count();

	$prev_entry = $next_entry = '';
	$current_entry_position = 0;
	foreach( $all_entries as $key => $query_entry ) {
		if( $query_entry->ID == $context->entry->ID ) {

			$current_entry_position = $key + 1;

			/** @var \GV|\GV\GF_Entry $prev_entry */
			$prev_entry = \GV\Utils::get( $all_entries, $key - 1, null );

			/** @var \GV|\GV\GF_Entry $next_entry */
			$next_entry = \GV\Utils::get( $all_entries, $key + 1, null );
			break;
		}
	}

	if( ! $prev_entry && ! $next_entry ) {
		return;
	}
?>

	<style>
		.gv-entry-nav-container {
			display: flex;
			margin: 2em 0;
			clear: both;
			justify-content: space-between;
		}

		.gv-entry-nav-item {
			display: flex;
			flex: 1;
			flex-basis: 50%;
			align-items: center;
		}
		.gv-entry-nav-item__prev {
			justify-content: flex-start;
		}
		.gv-entry-nav-item__count {
			justify-content: center;
		}
		.gv-entry-nav-item__next {
			justify-content: flex-end;
		}

		.gv-entry-nav-item a {
			border: 1px solid #ccc;
			padding: .33em .66em;
			border-radius: 5px;
		}
	</style>

	<nav class="gv-entry-nav-container">
	<?php

	$prev_entry_link = '';
	if ( $prev_entry ) {
		$prev_entry_link = GVCommon::get_link_html( $prev_entry->get_permalink( $view ), '&larr; Previous Entry' );
	}
	printf( '<span class="gv-entry-nav-item gv-entry-nav-item__prev">%s</span>', $prev_entry_link );

	if ( $entry_count && $current_entry_position ) {
		printf( '<span class="gv-entry-nav-item gv-entry-nav-item__count">%s</span>', strtr( esc_html__( 'Entry&nbsp;{current}&nbsp;of&nbsp;{count}', 'gk-gravityview' ), [
				'{current}' => '<strong>' . $current_entry_position . '</strong>',
				'{count}' => '<strong>' . $entry_count . '</strong>',
		] ) );
	}

	$next_entry_link = '';
	if ( $next_entry ) {
		$next_entry_link = GVCommon::get_link_html( $next_entry->get_permalink( $view ), 'Next Entry &rarr;' );
	}

	printf( '<span class="gv-entry-nav-item gv-entry-nav-item__next">%s</span>', $next_entry_link );

	?>
	</nav>
<?php
}