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User:Proteins/checkALTtext.js

//



// 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

alt_text = "";


temp_image = document.images[image_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', , );


});


//