USER:PROTEINS CHECKALTTEXT.JS

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Documentation for this user script can be added at User:Proteins/checkALTtext.

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//<pre>

// Check whether alt text is specified for all images on a page

//

// To use this script, add "importScript('User:Proteins/checkALTtext.js');" to your monobook.js subpage 

// under your user page, as you can see at User:Proteins/monobook.js



function checkAltText() { 

    var alt_text = "";

    var alert_string = "";

    var error_string = "";



    var temp_image;

    var parent_node;

    var grandparent_node;



    var num_pixels = 0;

    var image_index = 0;

    var num_raw_images = 0;



    var num_icon_images = 0;

    var num_icon_images_missing_alt_text = 0;

    var num_nonicon_images = 0;

    var num_nonicon_images_missing_alt_text = 0;



    var icon_percentage = 0.0;

    var nonicon_percentage = 0.0;





// Loop over the images

    num_icon_images = 0;

    num_icon_images_missing_alt_text = 0;

    num_nonicon_images = 0;

    num_nonicon_images_missing_alt_text = 0;



    num_raw_images = document.images.length;

    alert_string = "This document has " + num_raw_images + " images.\n\n";

//    window.alert(alert_string);



    for (image_index=0; image_index<num_raw_images; image_index++) {

        alt_text = "";

        temp_image = document.imagesimage_index];

        if (!temp_image) { continue; }

        alt_text = temp_image.alt;

 

        num_pixels = temp_image.width * temp_image.height;

        if (temp_image.src.match(/Replace_this_image_male\.svg/)) { continue; }

        if (temp_image.src.match(/Replace_this_image_female\.svg/)) { continue; }

        if (num_pixels > 5000) { 

                num_nonicon_images++; 

                if (!alt_text) { 

                     num_nonicon_images_missing_alt_text++; 

                     temp_image.src = "";

                }

                continue;

        }

        num_icon_images++; 

        if (!alt_text) { 

              num_icon_images_missing_alt_text++; 

              temp_image.src = "";

        }

    } // closes loop over the images

        icon_percentage = 0.0;

        nonicon_percentage = 0.0;



      if (num_nonicon_images > 0) { 

              nonicon_percentage = (100.0 * num_nonicon_images_missing_alt_text) / num_nonicon_images;

              nonicon_percentage = Math.round(nonicon_percentage);

               alert_string += num_nonicon_images_missing_alt_text + " of " + num_nonicon_images + " normal images ";

               if (num_nonicon_images_missing_alt_text == 1) { alert_string += "is"; } else { alert_string += "are";}

               alert_string += " missing alt text (" + nonicon_percentage + "%).\n\n";

      }

        if (num_icon_images > 0) { 

               icon_percentage = (100.0 * num_icon_images_missing_alt_text) / num_icon_images;

               icon_percentage = Math.round(icon_percentage);

                alert_string += num_icon_images_missing_alt_text + " of " + num_icon_images + " small images ";

               if (num_icon_images_missing_alt_text == 1) { alert_string += "is"; } else { alert_string += "are";}

                alert_string += " missing alt text (" + icon_percentage + "%).\n";

                alert_string += "Small images are defined as those having fewer than 5000 pixels.\n\n";

        }

      window.alert(alert_string);



} // closes function checkAltText() 



$(function () {

            mw.util.addPortletLink('p-cactions', 'javascript:checkAltText()', 'alt', 'ca-alttext', 'Check images for alt text', '', '');

});



//</pre>

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