I found the way to display the dimensions in separate lines by copy product-attributes.php
file to my child-theme and replace:
<?php if ( $display_dimensions && $product->has_dimensions() ) : ?>
<tr>
<th><?php _e( 'Dimensions', 'woocommerce' ) ?></th>
<td class="product_dimensions"><?php echo esc_html( wc_format_dimensions( $product->get_dimensions( false ) ) ); ?></td>
</tr>
<?php endif; ?>
with:
<?php if ( $display_dimensions && $product->has_dimensions() ) : ?>
<tr>
<th>Length</th>
<td class="product_dimensions"><?php echo $product->get_length() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<tr>
<th>Width</th>
<td class="product_dimensions"><?php echo $product->get_width() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<tr>
<th>Height</th>
<td class="product_dimensions"><?php echo $product->get_height() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<?php endif; ?>
The problem is that the products don't always have 3 dimensions...
And then it look like this:
How can I display only the relevant rows?
Updated: You can do it this way adding a condition for each dimension kind this way:
<?php
// For non variable products (separated dimensions)
if ( $display_dimensions && $product->has_dimensions() && ! $product->is_type('variable') ) :
if ( ! empty( $product->get_length() ) ) { ?>
<tr>
<th>Length</th>
<td class="product_dimensions"><?php echo $product->get_length() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<?php }
if ( ! empty( $product->get_width() ) ) { ?>
<tr>
<th>Width</th>
<td class="product_dimensions"><?php echo $product->get_width() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<?php }
if ( ! empty( $product->get_height() ) ) { ?>
<tr>
<th>Height</th>
<td class="product_dimensions"><?php echo $product->get_height() . get_option( 'woocommerce_dimension_unit' ); ?></td>
</tr>
<?php
// For variable products (we keep the default formatted dimensions)
elseif ( $display_dimensions && $product->has_dimensions() && $product->is_type('variable') ) : ?>
<tr>
<th><?php _e( 'Dimensions', 'woocommerce' ) ?></th>
<td class="product_dimensions"><?php echo esc_html( wc_format_dimensions( $product->get_dimensions( false ) ) ); ?></td>
</tr>
<?php endif; ?>
Tested and works.
Note: This doesn't handle variable products that uses Javascript to update the formatted dimensions on selected product variations.