使用箭头键浏览列表？ （JavaScript的/ JQ） [英] Navigate through list using arrow keys? (JavaScript/JQ)

问题描述

我似乎无法找到如何实现这一目标的答案，但这是我多次见过的一个功能。基本上我正在回显列表，我想创建使用箭头键/输入突出显示和选择这些项目的功能。有人可以帮助我了解如何实现这一目标吗？我知道如何使用密钥代码（当然），而不是如何将其转换为用于选择列表中项目的功能代码...

I can't seem to find an answer to how to accomplish this, yet it's a feature I've seen several times. Essentially I'm echoing out a list and I would like to create the ability to highlight and select these items using arrow keys/enter. Can someone help give me an idea as to how I can accomplish this? I know how to use keycodes (of course), just not how to turn that into functioning code for selecting items on a list...

我在想我也许d必须有一些隐藏的单选按钮，将其标记为选中或不...但即便如此，我也不知道如何从列表中的一个单选按钮跳到另一个单选按钮。所以如果有人能帮我一把，我真的很感激。谢谢。

I was thinking maybe I'd have to have some sort of hidden radio button to mark it as selected or not... but even then I don't know how I would jump from one radio button to the other up and down the list. So if anyone could give me a hand with this I'd really appreciate it. Thank you.

推荐答案

由于你没有真正解释你遇到的问题，我刚刚创建了一个通用解决方案。希望这会有所帮助：

Since you didn't really explain what you're having trouble with, I just created a general solution. Hopefully this helps:

var li = $('li');
var liSelected;
$(window).keydown(function(e) {
    if(e.which === 40) {
        if(liSelected) {
            liSelected.removeClass('selected');
            next = liSelected.next();
            if(next.length > 0) {
                liSelected = next.addClass('selected');
            } else {
                liSelected = li.eq(0).addClass('selected');
            }
        } else {
            liSelected = li.eq(0).addClass('selected');
        }
    } else if(e.which === 38) {
        if(liSelected) {
            liSelected.removeClass('selected');
            next = liSelected.prev();
            if(next.length > 0) {
                liSelected = next.addClass('selected');
            } else {
                liSelected = li.last().addClass('selected');
            }
        } else {
            liSelected = li.last().addClass('selected');
        }
    }
});

JSFiddle： http://jsfiddle.net/Vtn5Y/

JSFiddle: http://jsfiddle.net/Vtn5Y/

这篇关于使用箭头键浏览列表？ （JavaScript的/ JQ）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！