koProgress.js

// Bind Bootstrap Progress
ko.bindingHandlers.progress = {
    init: function (element, valueAccessor) {
        var $element = $(element);

        var bar = $('<div/>', {
            'class': 'progress-bar',
            'role': 'progressbar',
            'aria-valuemin': 0,
            'aria-valuemax': 100,
            'aria-valuenow': valueAccessor(),
            'data-bind': 'style: { width:' + valueAccessor() + '% }'
        });

        $element.addClass('progress progress-info')
                .append(bar);
  }
};