KeyBoard使用jquery导航菜单
[英]KeyBoard Navigation for menu using jquery
问题描述
I am trying to add keyboard navigation to Menu(ul li based ) , i have bound the keydown event to menu (or should i bind keydown to the document ?) 
我正在尝试将键盘导航添加到菜单（基于ul li），我已将keydown事件绑定到菜单（或者我应该将keydown绑定到文档？）
the handler function used is given below 使用的处理函数如下
KeyDown: function(e) {
var toFocus = false;
if (e.keyCode == 38) {
toFocus = $((e.target/* li */).next()[0]);
}
if (e.keyCode == 40) {
toFocus = $((e.target).next()[1]);
}
if (toFocus) {
$(e.target).attr('tabIndex', '-1');
$(toFocus).attr('tabIndex', '0');
toFocus.focus();
return false;
}
}
here i get e.target as html instead of li ? 在这里我得到e.target为html而不是li？
can u suggest any other way to add keyboard navigation ? 你可以建议任何其他方式添加键盘导航？
3 个解决方案
解决方案1
1 2009-09-11 06:06:50
解决方案2
1 2009-09-11 06:19:40
Try to use custom attribute to hold the tabid for up and down. 尝试使用自定义属性来保持tabid for up和down。
...KeyDown: function(e) {
var Direction;
if (e.keyCode == 38)
Direction = "toUp";
else Direction = "toDown";
var Focus = $("li[tabid=\""$(e.target.id).attr(Direction)"\"]");
Focus.focus();
}
---
<li ... tabid="1" toUp="-1" toDown= "2" />
<li ... tabid="2" toUp= "1" toDown= "3" />
<li ... tabid="3" toUp= "2" toDown= "4" />
<li ... tabid="4" toUp= "3" toDown="-1" />
The above code is just to show the idea, it is late now and I didn't have time to test it. 上面的代码只是为了表明这个想法，现在已经很晚了，我没有时间去测试它。 So please don't vote me down for not working. 所以请不要因为不工作而投票给我。
Hope that helps 希望有所帮助
解决方案3
0 2016-04-11 12:55:55
HTML HTML
<body>
<input type="text" id="target-box" >
<ul class="list">
<li class="selected">Hello</li>
<li>World</li>
</ul>
</body>
jQuery jQuery的
$(document).on('focus','#target-box', function() {
var target_box = $(this);
$(document).on('keyup', function(e) {
if(e.which == 38){ // up arrow
var selected_item = $('.selected');
if(typeof selected_item.prev()[0] !== 'undefined') {
selected_item.prev().addClass('selected');
selected_item.removeClass('selected');
}
} else if (e.which == 40) { // down arrow
var selected_item = $('.selected');
if (typeof selected_item.next()[0] !== 'undefined') {
selected_item.next().addClass('selected');
selected_item.removeClass('selected');
}
}
if (e.keyCode == 13) { // enter
target_box.val($('.selected').html());
}
});
});
CSS CSS
.selected {
width : 50px;
background-color: gray;
}
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