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POAdd a CSS class to all images on a page that have a width less than 480px using DomDocument
 

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  1. POAdd a CSS class to all images on a page that have a width less than 480px using DomDocument
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    <p>I would like to add a CSS class to all images on the page (WordPress post/pages) that are below a certain width.</p> <p>The following works but <strong>setAttribute</strong> is replacing all the class names in each img with the new one. </p> <p>How can I add a new class to each image, without replacing the existing classes? </p> <pre><code>function add_class_to_small_images( $content ) { $dom = new DOMDocument(); @$dom-&gt;loadHTML( $content ); $dom-&gt;preserveWhiteSpace = false; $images = $dom-&gt;getElementsByTagName('img'); foreach ($images as $image) { $width = $image-&gt;getAttribute('width'); if( $width &lt; 480) { $image-&gt;setAttribute('class', 'this-will-be-the-class'); // the new class } } $content = $dom-&gt;saveHTML(); return $content; } add_filter('the_content', 'add_class_to_small_images'); </code></pre>
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    1. USDimitre Novatchev
    1. USAndrew
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      1. POAdd a CSS class to all images on a page that have a width less than 480px using DomDocument
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      1. VTUpMod
    1. COThe width in firebug is calculated based on the actual output in the browser, with php you'd need to fetch each image an process it with ImageMagick to find out the actual width. So the best way to go here would be using jQuery or any other JavaScript library.
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      1. POAdd a CSS class to all images on a page that have a width less than 480px using DomDocument
      1. USThomas Stachl
    2. CO@ThomasStachl Thank you. If I understand you correctly, you're saying it's not possible to use PHP to get an images true size. Bugger, wanted to avoid jQuery for this one.
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      1. USAndrew
    3. CO@ThomasStachl Actually, now that I think about it, I might be ok with searching for the `width` attribute of each image as each image has one. Will give that a shot instead.
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      1. USAndrew
 

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