require(['gitbook', 'jQuery'], function (gitbook, $) { var url = '' var style = '' var insertLogo = function (url, style) { $('.book-summary').children().eq(0).before('<div class="book-logo"><img src="' + url + '" style="' + style + '"></div>') } gitbook.events.bind('start', function (e, config) { url = config['insert-logo']['url'] style = config['insert-logo']['style'] }) gitbook.events.bind("page.change", function() { insertLogo(url, style) }) })