我有一个下拉菜单，我需要我可以通过键盘访问，但不知道该怎么做。在我的 css 中，我将 a:focus 放在所有链接上。我假设在 javascript/jquery 中使用 onfocus 是最好的，而不是将 tab 键硬编码到 javascript 中，对吗？如果是这样，我将如何处理代码以使用焦点选择器？当有人进入菜单时，菜单需要放下，然后当他们关闭菜单时（或者他们可以按退出键，因为有超过 40 个链接）它需要关闭（需要就像鼠标悬停/鼠标悬停时一样）。 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"> </a></li>
<li class="last-item"><a href="/current">Go to Current Students</a></li>
</ul></li>
</ul>
</div>