使用fullpage.js將類添加到粘性菜單

Question

我正在嘗試使用fullpage.js在滾動菜單上添加一個類。

我想要的是＃top-wrapper在第一部分/頁面加載時是正常的，然后向下滾動時會添加一類is-fixed。 如果您滾動回到第一部分，則該類為固定類將被刪除。

當前發生的情況是，隨着用戶向下滾動，添加了is-fixed類（這是正確的）。 但是，如果您向上滾動到第一部分，則不會刪除該類。

這是我的代碼：

 var fullPageInstance = new fullpage('#page-wrapper', { anchors: ['firstPage', 'secondPage', '3rdPage', '4thpage', '5thpage', '6thpage'], menu: '#side-menu', slidesNavigation: true, scrollingSpeed: 1000, parallax: true, parallaxOptions: { type: 'cover', percentage: 62, property: 'translate' }, onLeave: function(index, nextIndex, direction){ if (nextIndex != 1){ $('#top-wrapper').addClass('is-fixed'); } else { $('#top-wrapper').removeClass('is-fixed'); } } }); 

Answer 1

嘗試next.index屬性

 var fullPageInstance = new fullpage('#page-wrapper', { anchors: ['firstPage', 'secondPage', '3rdPage', '4thpage', '5thpage', '6thpage'], menu: '#side-menu', slidesNavigation: true, scrollingSpeed: 1000, parallax: true, parallaxOptions: { type: 'cover', percentage: 62, property: 'translate' }, onLeave: function(index, next, direction) { if (next.index != 0) { $('#top-wrapper').addClass('is-fixed'); } else { $('#top-wrapper').removeClass('is-fixed'); } } }); 

 .section:nth-child(odd) { background-color: green; } .section:nth-child(even) { background-color: red; } .is-fixed { color: #fff; position: fixed; z-index: 1; } 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/fullPage.js/3.0.7/fullpage.min.js" integrity="sha256-e13jRNqOX98m6UAwI/yZTpcDseJtA8s86yfFs4Sqrv8=" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/fullPage.js/3.0.7/vendors/scrolloverflow.min.js" integrity="sha256-R7CttZ4L0/szai0hbFUlPDiRaEJmqYuvLhyAOr19vQg=" crossorigin="anonymous"></script> <div id="top-wrapper">top wrapper</div> <div id="page-wrapper"> <div class="section">Some section</div> <div class="section">Some section</div> <div class="section">Some section</div> <div class="section">Some section</div> </div> 

注意：在Full page視圖中運行演示