Template Engine

jQuery File Upload makes use of the JavaScript Templates engine to render the list of files. You can find documentation for this template engine on the project page.

However, you are not required to use this specific template engine and can replace it with a different implementation, by setting the filesContainer, uploadTemplateId, downloadTemplateId, uploadTemplate and downloadTemplate options:

$('#fileupload').fileupload({
    uploadTemplateId: null,
    downloadTemplateId: null,
    uploadTemplate: function (o) {
        var rows = $();
        $.each(o.files, function (index, file) {
            var row = $('<tr class="template-upload fade">' +
                '<td><span class="preview"></span></td>' +
                '<td><p class="name"></p>' +
                '<div class="error"></div>' +
                '</td>' +
                '<td><p class="size"></p>' +
                '<div class="progress"></div>' +
                '</td>' +
                '<td>' +
                (!index && !o.options.autoUpload ?
                    '<button class="start" disabled>Start</button>' : '') +
                (!index ? '<button class="cancel">Cancel</button>' : '') +
                '</td>' +
                '</tr>');
            row.find('.name').text(file.name);
            row.find('.size').text(o.formatFileSize(file.size));
            if (file.error) {
                row.find('.error').text(file.error);
            }
            rows = rows.add(row);
        });
        return rows;
    },
    downloadTemplate: function (o) {
        var rows = $();
        $.each(o.files, function (index, file) {
            var row = $('<tr class="template-download fade">' +
                '<td><span class="preview"></span></td>' +
                '<td><p class="name"></p>' +
                (file.error ? '<div class="error"></div>' : '') +
                '</td>' +
                '<td><span class="size"></span></td>' +
                '<td><button class="delete">Delete</button></td>' +
                '</tr>');
            row.find('.size').text(o.formatFileSize(file.size));
            if (file.error) {
                row.find('.name').text(file.name);
                row.find('.error').text(file.error);
            } else {
                row.find('.name').append($('<a></a>').text(file.name));
                if (file.thumbnailUrl) {
                    row.find('.preview').append(
                        $('<a></a>').append(
                            $('<img>').prop('src', file.thumbnailUrl)
                        )
                    );
                }
                row.find('a')
                    .attr('data-gallery', '')
                    .prop('href', file.url);
                row.find('button.delete')
                    .attr('data-type', file.delete_type)
                    .attr('data-url', file.delete_url);
            }
            rows = rows.add(row);
        });
        return rows;
    }
});

Notes:

• The uploadTemplate and downloadTemplate methods are supposed to return either a jQuery collection object or a string representation of the rendered upload / download template.
• The data parameter passed via add callback is stored via jQuery.data on the rendered templates and later reused when submitting or canceling the file upload.
• The rendered templates are expected to have a class of template-upload / template-download for the start and cancel handlers to retrieve the data parameter and for the delete handler to set the context to the template.
• If you don't want any transition effects for the template rendering, remove the fade class from the templates.

Alternatively, you could also provide your own window.tmpl template method which accepts template IDs and returns template functions accepting a data parameter and rendering the template content as HTML string or jQuery collection:

window.tmpl = function (id) {
    if (id === 'template-upload') {
        return function (data) {
            return '<tr class="template-upload"><!-- ... --></tr>';
        };
    }
    if (id === 'template-download') {
        return function (data) {
            return '<tr class="template-download"><!-- ... --></tr>';
        };
    }
}

Here's how the templates look like in Mustache / Handlebars