鍵盤無法通過子菜單迭代下拉菜單

Question

我需要一些幫助，試圖解決我的導航問題。我可以通過導航來顯示下拉菜單，當列表項使用標籤按鈕進入焦點時，但我無法獲得標籤來遍歷下拉菜單（子菜單），它只是標籤到下一個列表項標籤。

我已經嘗試jQuery沒有運氣，現在我只是想使用html，css和tabindex，但仍然沒有運氣。

HTML

<nav aria-label="Main menu" id="globalNav" > 
     <ul> 
     <li class="dropdown" tabindex="0" ><a href="#"><span itemprop="name">Welcome</span></a> 
     <ul class="sub-menu"> 
     <li role="menuitem"><a href="#">Visitor</a></li> 
     <li role="menuitem"><a href="#">Aid</a></li> 
     <li role="menuitem"><a href="#">Payments</a></li> 
     </ul> 
     </li> 
    <li class="dropdown" tabindex="0"><a href="#"><span itemprop="name">Sports</span></a> 
     <ul class="sub-menu"> 
     <li role="menuitem"><a href="#">Basketball</a></li> 
     <li role="menuitem"><a href="#">Football</a></li> 
     <li role="menuitem"><a href="#">Soccer</a></li> 
     </ul> 
    </li> 
    </ul> 
    </nav> 

CSS

#globalNav { 
    width: 100%; 
    border-bottom: 3px solid rgba(74, 61, 48, 0.3); 
    padding: 0.54rem 0; 
    margin-top: 30px; 
    z-index: 10; 
    } 
    #globalNav ul {  
    list-style: none; 
    display: table; 
    margin: 0 auto; 
    font-size: 1rem; 
    text-transform: uppercase; 
    } 
    #globalNav ul li.dropdown { 
    display: table-cell; 
    padding: 0 10px; 
    border-left: 1px solid #EEE; 
    text-align: center; 
    } 

    #globalNav ul li.dropdown a{ 
    color: #4A3D30; 
    display: inline-block; 
    position: relative; 
    } 
    #globalNav ul li.dropdown a:hover, 
    #globalNav ul li.dropdown a:focus, 
    #globalNav ul li.dropdown a:active{ 
     color:#666; 
    } 

    #globalNav ul li.dropdown a.active:after{ 
     width: 100%; 
     background: #990000; 
    } 

    #globalNav ul li.dropdown a:after{ 
     content: ""; 
     display: block; 
     margin: auto; 
     height: 2px; 
     width: 0; 
     background-color: transparent; 
    } 
    /*Children GlobalNav*/ 
    #globalNav ul li.dropdown a ul.sub-menu { 
    } 

    #globalNav ul li.dropdown ul.sub-menu { 
     position: absolute; 
     display: none; 
     z-index: 100; 
     text-transform: none; 
     min-width: 256px; 
     max-width: 256px; 
    } 

    #globalNav ul li.dropdown:hover ul.sub-menu, 
    #globalNav ul li.dropdown:focus ul.sub-menu, 
    #globalNav ul li.dropdown:active ul.sub-menu{ 
    display: block; 
    background-color: #dcd8d6; 
    color: #4a3d30; 
    } 
    #globalNav ul li.dropdown ul.sub-menu:hover, 
    #globalNav ul li.dropdown ul.sub-menu:focus, 
    #globalNav ul li.dropdown ul.sub-menu:active { 
     background-color: #3f79c1; 
    } 

    #globalNav ul li.dropdown ul.sub-menu li a { 
    padding: 8px; 
    } 

這裏是我的codepen http://codepen.io/nicban/pen/vmEEPr

我覺得我失去了一些東西明顯

Answer 1

我使用一些腳本添加向具有焦點和走向的項目分類DOM將它添加到祖先，以便我可以顯示它們。焦點改變時，我也會移除課程。

已經有一段時間了，因爲我已經檢查了它，以刪除/調整任何愚蠢的位。

您遇到的部分問題是您正在使用display: none，這意味着鍵盤永遠無法找到它。如果您使用屏幕外技術，則用戶可以將其鍵入控件。

此外，請刪除role="menuitem"以及tabindex="0"。前者意味着你不支持的交互（如箭頭鍵），而後者會創建額外的製表位，而這些製表位並不會正確地向屏幕閱讀器宣佈自己。

// Get the nav by id 
    var pNav = document.getElementById("globalNav"); 

    function unClassy(){ 
     try { 
     // Remove the focus class 
     pNav.classList.remove("focus"); 
     // Remove the focus class from all its descendents 
     pNavDesc = pNav.getElementsByTagName('*'); 
     for(var i = 0; i<pNavDesc.length; i++){ 
      pNavDesc[i].removeAttribute("class"); 
     } 
     } catch (e) { 
     console.log(e); 
     } 
    } 

    /* For any clicks, clear the focus class from the nav and all its descendants, essentially closing the menu when a user clicks/taps outside of it. */ 
    document.documentElement.onclick=function() { 
     try { 
     unClassy(); 
     } catch (e) { 
     console.log(e); 
     } 
    } 

    /* Manipulate focus classes in navigation. */ 
    function classy(){ 
     try { 
     unClassy(); 
     // Add the focus class to items that have focus 
     // Get the element that currently has focus 
     var focusedElement = document.activeElement; 
     // If that element is the primary nav, add the class 
     if (focusedElement.id == pNav.id){ 
      // Add the focus class 
      pNav.classList.add("focus"); 
     } 
     // If nav contains the focused element, add the class 
     if (pNav.contains(focusedElement)){ 
      focusedElement.classList.add("focus"); 
      el = focusedElement; 
      while (el.parentNode) { 
      el.classList.add("focus"); 
      el = el.parentNode; 
      } 
     } 
     } catch (e) { 
     console.log(e); 
     } 
    } 

    /* Delay the assigning of classes to give the :focus a chance to catch up. There has to be a better way for this. */ 
    document.documentElement.addEventListener("keydown", delayClassy, false); 
    function delayClassy(){ 
     try { 
     setTimeout(classy, 200); 
     } catch (e) { 
     console.log(e); 
     } 
    }