Responsive Images

This topic has 2 replies, 2 voices, and was last updated 8 years, 6 months ago by Martin.

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June 7, 2016 at 6:15 AM #3377

Martin

Participant

Hi,
I'm trying to use the srcset and sizes information for displaying the images in the front-end.

The only thing left I have to do is to display the sizes, I get an Array as a value.

page-template-gallery.php


<?php
$images = rwmb_meta( 'your_prefix_imgadv', 'size=full' );

if ( !empty( $images ) ) {
    foreach ( $images as $image ) {
        echo "\n<a href='{$image['full_url']}'>\n<img src='{$image['url']}' width='{$image['width']}' height='{$image['height']}' alt='{$image['alt']}' srcset='{$image['srcset']}' sizes='{$image['sizes']}'>\n</a>";
    }
}
?>

When I view the source code I get this


<img src='http://localhost/wordpress/wp-content/uploads/2016/06/hero-01.jpg' width='1680' height='740' alt='Hero image 1' srcset='http://localhost/wordpress/wp-content/uploads/2016/06/hero-01-300x132.jpg 300w, http://localhost/wordpress/wp-content/uploads/2016/06/hero-01-768x338.jpg 768w, http://localhost/wordpress/wp-content/uploads/2016/06/hero-01-1024x451.jpg 1024w' sizes='Array'>

What do I need to modify in the template file to display the sizes array values?

Thanks!

June 7, 2016 at 8:29 AM #3378

Anh Tran

Keymaster

Hi, the sizes value returned is not the sizes attribute in responsive image. It's an array of the following info:

[sizes] => Array
(
   [thumbnail] => Array
       (
           [file] => press_image-150x150.jpg
           [width] => 150
           [height] => 150
           [mime-type] => image/jpeg
       )
   [medium] => Array
       (
           [file] => press_image-4-300x194.jpg
           [width] => 300
           [height] => 194
           [mime-type] => image/jpeg
       )
   [large] => Array
       (
           [file] => press_image-1024x665.jpg
           [width] => 1024
           [height] => 665
           [mime-type] => image/jpeg
       )
   [post-thumbnail] => Array
       (
           [file] => press_image-624x405.jpg
           [width] => 624
           [height] => 405
           [mime-type] => image/jpeg
       )
)

To get the sizes attribute, we can use the following function:

wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 )

So, in your code, you can do like this:

foreach ( $images as $image ) {
    $sizes = wp_calculate_image_sizes( array( $image['width'], $image['height'] ), null, null, $image['ID'] );
    echo "\n<a href='{$image['full_url']}'>\n<img src='{$image['url']}' width='{$image['width']}' height='{$image['height']}' alt='{$image['alt']}' srcset='{$image['srcset']}' sizes='{$sizes}'>\n</a>";
}

June 7, 2016 at 9:50 PM #3387

Martin

Participant

Thanks so much! Keep up the good work 🙂

Cheers!
Martin.

Author

Posts

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