如何使下拉菜单键盘可访问？

Question

我有一个下拉菜单，需要我可以通过键盘对其进行访问，但不知道该怎么做。 在我的CSS中，我对所有链接都使用a：focus。 我假设在javascript / jquery中使用onfocus将是最好的方法，而不是将Tab键硬编码到javascript中，对吗？ 如果是这样，我将如何处理使用焦点选择器的代码？ 菜单需要在有人跳入菜单时放下，然后在他们跳出菜单时放下（或者因为有40多个链接，他们可能会按逃逸键），它需要关闭（就像在鼠标悬停/移出时一样） ）。 示例菜单

if (ie === "1") {
if ($(window).width() > 949) {

$.fn.pause=function(a){$(this).stop().animate({dummy:1},a);return this};
function mouseleft(){$("#buttonbar").triggerHandler("mouseleave")}
$(document).ready(function()
  {$("#buttonbar").mouseenter(function(){$(this).stop().pause(160).animate({height:"12.7em"},400,"easeOutQuart")}).mouseleave(function(){$(this).stop().pause(160).animate({height:"2.2em"},400,"easeOutQuart")});});$(function(){$("#accordion").accordion({fillSpace:!0,icons:{header:"accordion-header",headerSelected:"accordion-headerselected"}})});
if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)) || (navigator.userAgent.match(/iPad/i))) {
    $("#buttonbar li").bind('touchstart', function(){
        console.log("touch started");
    });
$("#buttonbar li").bind('touchend', function(){
        console.log("touch ended");
    });
}
else {
 $("#accordion").accordion({active:false});
}
}

function showElement(d){
  var s=document.getElementById(d).style;
  if ($(window).width() < 950) {
    if (s.display != "block" ) { s.display = "block"; } else { s.display = "none"; }
  if ($(window).width() > 949) {
    if (s.display != "block" ) { s.display = "block"; } 
  }
}
}
function showHide() {
  var s=document.getElementById("buttonbar").style;
  if ($(window).width() > 949) {
    s.display = "block";
    document.getElementById("prospective-links").style.display = "block";
    document.getElementById("current-links").style.display = "block";
    document.getElementById("academic-links").style.display = "block";
    document.getElementById("facstaff-links").style.display = "block";
    document.getElementById("parent-links").style.display = "block";
    document.getElementById("alumni-links").style.display = "block";
    document.getElementById("visitor-links").style.display = "block";
$("#accordion").accordion('destroy');
    $("#buttonbar").unbind('mouseenter');
    $("#buttonbar").unbind('mouseleave');
$.fn.pause=function(a){$(this).stop().animate({dummy:1},a);return this};
function mouseleft(){$("#buttonbar").triggerHandler("mouseleave")}
$(document).ready(function()
  {$("#buttonbar").mouseenter(function(){$(this).stop().pause(160).animate({height:"12.7em"},400,"easeOutQuart")}).mouseleave(function(){$(this).stop().pause(160).animate({height:"2.2em"},400,"easeOutQuart")});});$(function(){$("#accordion").accordion({fillSpace:!0,icons:{header:"accordion-header",headerSelected:"accordion-headerselected"}})});
if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)) || (navigator.userAgent.match(/iPad/i))) {
    $("#buttonbar li").bind('touchstart', function(){
        console.log("touch started");
    });
$("#buttonbar li").bind('touchend', function(){
        console.log("touch ended");
    });
}

  }
  else {
    /*$("#accordion").accordion({active:false});*/
    $("#accordion").accordion('destroy');
    $("#buttonbar").unbind('mouseenter');
    $("#buttonbar").unbind('mouseleave');
    $("#buttonbar li").unbind('touchstart');
    $("#buttonbar li").unbind('touchend');

    s.display = "none";
    document.getElementById("prospective-links").style.display = "none";
    document.getElementById("current-links").style.display = "none";
    document.getElementById("academic-links").style.display = "none";
    document.getElementById("facstaff-links").style.display = "none";
    document.getElementById("parent-links").style.display = "none";
    document.getElementById("alumni-links").style.display = "none";
    document.getElementById("visitor-links").style.display = "none";
    /*$("#buttonbar").accordion('destroy');*/

  }

}
$(window).resize(showHide); //Run when resized

jQuery(function($) {
  var path = location.pathname.substring(1);
  $('#nav a[href$="' + path + '"]').addClass('active');
});

// This section makes the skip to anchor links such as the skip to content link work in webkit browsers like Chrome and Safari
(function(linkList,i,URI) {
   if (!!(URI = document.documentURI)) {
        URI = URI.split('#')[0];
      document.addEventListener("DOMContentLoaded", function() {
         document.removeEventListener("DOMContentLoaded", arguments.callee, false);
         linkList = document.links;
         for (i in linkList) {
            if (!!linkList[i].hash) {
               if (linkList[i].hash.match(/^#./)) {
                  if ((URI+linkList[i].hash)==linkList[i].href){
                     linkList[i].addEventListener("click", function(e,f,g) {
                        f = document.getElementById(this.hash.slice(1));
                        if (!(g = f.getAttribute('tabIndex'))) f.setAttribute('tabIndex',-1);
                        f.focus();
                        if (!g) f.removeAttribute('tabIndex');
                     }, false);
                  }
               }
            }
         }
      }, false);
   }
   return true;
})();
}
else {
function showElement(d){
  var s=document.getElementById(d).style;
  if (s.display != "block" ) { s.display = "block"; } else { s.display = "none"; }
};


};

html如下：

    <div id="buttonbar">
    <ul id="bar">
  <li id="prospective" class="rightborder"><a>Future Students</a>
    <ul id="prospective-links">
      <li><a href="/admissions">Undergraduate Admissions</a></li>
      <li><a href="/graduate">Graduate Admissions</a></li>
      <li><a href="/admissions/international">International Admissions</a></li>
      <li><a href="/transfer">Transfer Admissions</a></li>
      <li><a href="/advising-center">Academic Advising Center</a></li>
      <li><a href="/financial_aid">Financial Assistance</a></li>
      <li><a href="/info/schedules/tuition">Tuition and Fees</a></li>
      <li><a href="#">Test Item 8</a></li>
      <li class="last-item"><a href="/prospective">Go to Future Students</a></li>
    </ul></li>
      <li id="students" class="rightborder"><a href="/current">Current Students</a>
         <ul id="current-links">
            <li><a href="/info/calendars/academic">Academic Calendar</a></li>
            <li><a href="/info/schedules">Enrollment Schedule</a></li>
            <li><a href="/studentservices">Student Life</a></li>
            <li><a href="/housing">Housing</a></li>
            <li><a href="/financial_aid/workstudy.html">On-Campus Jobs</a></li>
            <li><a href="#">Bookstore</a></li>
            <li><a href="#">Athletics</A></li>
            <li class="fill"><a name="hold">&nbsp;</a></li>
            <li class="last-item"><a href="/current">Go to Current Students</a></li>
         </ul></li>
    </ul>
    </div>

Answer 1

尝试将tabIndex用于链接。 （但正如steveaz指出的那样，它们应该已经聚焦）

$('#buttonbar a').attr('tabIndex', 0);

对于菜单，您必须添加一个事件以及tabIndex 。 $menu是$menu的选择器，我不确定是什么，请根据您的需要进行调整：

$('#bar').attr('tabIndex', 0)
  .focus(function() { $menu.show(); })
  .keydown(function(e) { e.which == 27 && $menu.hide(); }) // ESC
  .blur(function() { $menu.hide(); });

Answer 2

我会尝试类似...给按钮栏一个标签索引，然后绑定焦点/模糊功能以显示和隐藏按钮栏菜单

$(document).load(function(){

    $('#buttonbar').attr('tabIndex', 0).on({
       focus: function(){
          $("#buttonbar").triggerHandler("mouseenter");
       },
       blur: function(){
          $("#buttonbar").triggerHandler("mouseleave");
       }
    });

});