MediaWiki:Common.js/sources.js

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/* Any JavaScript here will be loaded for all users on the upload page. */
//<source lang="javascript">

var template = "{" + "{Image summary\n| summary = \n| artist = \n| source = \n| licensing = \n}}";

if (window.jQuery) {
    jQuery(document).ready(function() {
        if ($('#wpUploadDescription').val() == '') {
            $('#wpUploadDescription').text(template);
        }

        $('#mw-upload-form').submit(function() {
            if ($('#wpUploadDescription').val().toLowerCase().indexOf('image summary') == -1) {
                alert("Please use the image summary template:\n\n" + template);
                return false;
            }
            else {
                return true;
            }
        });
    });
}

//</source>