Add custom links to each image in Elementor Carousel

functions.php

<?php

add_filter( 'attachment_fields_to_edit', function( $form_fields, $post ) {
	$form_fields[ 'elementor_carousel_custom_link' ] = array(
		'label' => __( 'Custom link', 'elementor' ),
		'input' => 'text',
		'value' => get_post_meta( $post->ID, 'elementor_carousel_custom_link', true ),
		'helps' => __( 'This will add a link to images in Elementor Carousel', 'elementor' ),
	);

	$target  = (bool) get_post_meta( $post->ID, 'elementor_carousel_custom_link_target', true );
	$checked = ( $target ) ? 'checked' : '';

	$form_fields[ 'elementor_carousel_custom_link_target' ] = array(
		'label' => __( 'Open in new tab ?', 'elementor' ),
		'input' => 'html',
		'html'  => "<input type='checkbox' {$checked} name='attachments[{$post->ID}][elementor_carousel_custom_link_target]' id='attachments[{$post->ID}][elementor_carousel_custom_link_target]' />",
		'value' => $target,
		'helps' => __( 'Open custom link in Elementor Carousel in new tab ?', 'elementor' ),
	);

	return $form_fields;
},          10, 2 );

add_filter( 'attachment_fields_to_save', function( $post, $attachment ) {
	if ( isset( $attachment[ 'elementor_carousel_custom_link' ] ) ) {
		update_post_meta(
			$post[ 'ID' ],
			'elementor_carousel_custom_link',
			$attachment[ 'elementor_carousel_custom_link' ]
		);
	}

	if ( isset( $attachment[ 'elementor_carousel_custom_link_target' ] ) ) {
		$target = ( $attachment[ 'elementor_carousel_custom_link_target' ] == 'on' ) ? '1' : '0';
		update_post_meta( $post[ 'ID' ], 'elementor_carousel_custom_link_target', $target );
	}

	return $post;
},          10, 2 );

add_action( 'elementor/widget/render_content', function( $content, $widget ) {
	if ( 'image-carousel' === $widget->get_name() ) {
		// ob_start();
		$settings = $widget->get_settings_for_display();

		if ( empty( $settings[ 'carousel' ] ) ) {
			return;
		}

		$slides = [];

		foreach ( $settings[ 'carousel' ] as $index => $attachment ) {
			$image_url = Elementor\Group_Control_Image_Size::get_attachment_image_src( $attachment[ 'id' ], 'thumbnail', $settings );

			if ( ! $image_url && isset( $attachment[ 'url' ] ) ) {
				$image_url = $attachment[ 'url' ];
			}

			$image_html = '<img class="swiper-slide-image" src="' . esc_attr( $image_url ) . '" alt="' . esc_attr( Elementor\Control_Media::get_image_alt( $attachment ) ) . '" />';

			$link_tag = '';

			$link = elementor_carousel_custom_link_get_link_url( $attachment, $settings );

			if ( $link ) {
				$link_key = 'link_' . $index;

				if ( get_elementor_carousel_custom_link( $attachment ) ) {
					$link_tag = '<a data-elementor-open-lightbox="no" href="' . get_elementor_carousel_custom_link( $attachment ) . '" target="' . get_elementor_carousel_custom_link_target( $attachment ) . '">';
				} else {
					$link_tag = '<a ' . $widget->get_render_attribute_string( $link_key ) . '>';
				}
			}

			$image_caption = elementor_carousel_custom_link_get_image_caption( $attachment, $widget );

			$slide_html = '<div class="swiper-slide">' . $link_tag . '<figure class="swiper-slide-inner">' . $image_html;

			if ( ! empty( $image_caption ) ) {
				$slide_html .= '<figcaption class="elementor-image-carousel-caption">' . wp_kses_post( $image_caption ) . '</figcaption>';
			}

			$slide_html .= '</figure>';

			if ( $link ) {
				$slide_html .= '</a>';
			}

			$slide_html .= '</div>';

			$slides[] = $slide_html;
		}

		if ( empty( $slides ) ) {
			return;
		}

		$show_dots   = ( in_array( $settings[ 'navigation' ], [ 'dots', 'both' ] ) );
		$show_arrows = ( in_array( $settings[ 'navigation' ], [ 'arrows', 'both' ] ) );

		$slides_count = count( $settings[ 'carousel' ] );

		?>
        <div <?php $widget->print_render_attribute_string( 'carousel-wrapper' ); ?>>
            <div <?php $widget->print_render_attribute_string( 'carousel' ); ?>>
				<?php // PHPCS - $slides contains the slides content, all the relevent content is escaped above. ?>
				<?php echo implode( '', $slides ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
            </div>
			<?php if ( 1 < $slides_count ) : ?>
				<?php if ( $show_dots ) : ?>
                    <div class="swiper-pagination"></div>
				<?php endif; ?>
				<?php if ( $show_arrows ) : ?>
                    <div class="elementor-swiper-button elementor-swiper-button-prev">
                        <i class="eicon-chevron-left" aria-hidden="true"></i>
                        <span class="elementor-screen-only"><?php echo esc_html__( 'Previous', 'elementor' ); ?></span>
                    </div>
                    <div class="elementor-swiper-button elementor-swiper-button-next">
                        <i class="eicon-chevron-right" aria-hidden="true"></i>
                        <span class="elementor-screen-only"><?php echo esc_html__( 'Next', 'elementor' ); ?></span>
                    </div>
				<?php endif; ?>
			<?php endif; ?>
        </div>
		<?php
	} else {
		return $content;
	}
},          10, 2 );

function get_elementor_carousel_custom_link( $attachment ) {
	$custom_link = get_post_meta( $attachment[ 'id' ], 'elementor_carousel_custom_link' );
	if ( isset( $custom_link ) && is_array( $custom_link ) && ! empty( $custom_link[ 0 ] ) ) {
		return $custom_link[ 0 ];
	}

	return false;
}

function get_elementor_carousel_custom_link_target( $attachment ) {
	$target = get_post_meta( $attachment[ 'id' ], 'elementor_carousel_custom_link_target' );
	if ( isset( $target ) && is_array( $target ) && ! empty( $target[ 0 ] ) ) {
		if ( $target[ 0 ] === '1' ) {
			return "_blank";
		}

		return "";
	}

	return "";
}

function elementor_carousel_custom_link_get_link_url( $attachment, $instance ) {
	if ( 'none' === $instance[ 'link_to' ] ) {
		return false;
	}

	if ( 'custom' === $instance[ 'link_to' ] ) {
		if ( empty( $instance[ 'link' ][ 'url' ] ) ) {
			return false;
		}

		return $instance[ 'link' ];
	}

	return [
		'url' => wp_get_attachment_url( $attachment[ 'id' ] ),
	];
}

function elementor_carousel_custom_link_get_image_caption( $attachment, $widget ) {
	$caption_type = $widget->get_settings_for_display( 'caption_type' );

	if ( empty( $caption_type ) ) {
		return '';
	}

	$attachment_post = get_post( $attachment[ 'id' ] );

	if ( 'caption' === $caption_type ) {
		return $attachment_post->post_excerpt;
	}

	if ( 'title' === $caption_type ) {
		return $attachment_post->post_title;
	}

	return $attachment_post->post_content;
}

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