如何通过 <ul> 使用键盘导航<li>元素

2022-01-10 00:00:00 contextmenu jquery navigation html css

可能重复:
使用 jquery 的菜单的键盘导航

我使用 <ul> 创建了一个菜单.<li> 标记并在用户按下文本框中的 Enter 键时将其显示给用户.他可以使用鼠标选择菜单项目(在菜单中导航),但我也希望允许他使用键盘的向上/向下按钮从该菜单中选择项目.

I created a menu using <ul> <li> tags and showing it to the user when he presses Enter key in the textbox. He can select items of the menu (navigate in menu) using mouse but I want also to allow him to select items from that menu using up/dow buttons of the keyboard for example.

有没有办法使用 jQuery 或 CSS 来做到这一点?

Is it any way to do that using jQuery or CSS?

我的菜单结构如下:

<div class="services">
  <div class="items">
    <ul>                           
        <li class="mail-icon"><a href="#" id="mail"><?php echo $langmsg['mail']; ?></a></li>
        <li class="forum-icon"><a href="#" id="forum"><?php echo $langmsg['forum']; ?></a></li>
        <li class="chat-icon"><a href="#" id="chat"><?php echo $langmsg['chat']; ?></a></li>
    </ul>
  </div>
</div>

注意:<li> 元素也有背景图片.

Note: <li> element has a background image also.

推荐答案

工作中的jsFiddle

以下是如何处理循环选择:

Here is how to handle circular selection:

if (e.keyCode == 38) { // up
    var selected = $(".selected");
    $(".services li").removeClass("selected");

    // if there is no element before the selected one, we select the last one
    if (selected.prev().length == 0) {
        selected.siblings().last().addClass("selected");
    } else { // otherwise we just select the next one
        selected.prev().addClass("selected");
    }
}

css:

.services li.selected {
    background-color: grey;   
}

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