在JS / jQuery中绑定箭头键 [英] Binding arrow keys in JS/jQuery

问题描述

如何在Javascript和/或jQuery中将函数绑定到左右箭头键？我查看了jQuery的js-hotkey插件（包含内置的绑定函数以添加一个参数来识别特定的键），但它似乎不支持箭头键。

How do I go about binding a function to left and right arrow keys in Javascript and/or jQuery? I looked at the js-hotkey plugin for jQuery (wraps the built-in bind function to add an argument to recognize specific keys), but it doesn't seem to support arrow keys.

推荐答案

$(document).keydown(function(e) {
    switch(e.which) {
        case 37: // left
        break;

        case 38: // up
        break;

        case 39: // right
        break;

        case 40: // down
        break;

        default: return; // exit this handler for other keys
    }
    e.preventDefault(); // prevent the default action (scroll / move caret)
});

将箭头键的自定义代码放在相应的案例和中断行。

Put your custom code for the arrow keys between the corresponding case and break lines.

e.which 由jQuery规范化，因此适用于所有浏览器。对于纯JavaScript方法，请将前两行替换为：

e.which is normalized by jQuery, so it works in all browsers. For a pure javascript approach, replace the first two lines with:

document.onkeydown = function(e) {
    e = e || window.event;
    switch(e.which || e.keyCode) {

（编辑2017）

如果你觉得很花哨，你可以使用 e.key 而不是 e.which 或 e.keyCode 现在。 e.key 正在成为推荐标准，允许您检查字符串：'ArrowLeft'，'ArrowUp'，'ArrowRight'，'ArrowDown'。新的浏览器本身支持它，点击此处。

(edit 2017)
If you feel fancy, you can use e.key instead of e.which or e.keyCode now. e.key is becoming a recommended standard, allowing you to check against strings: 'ArrowLeft', 'ArrowUp', 'ArrowRight', 'ArrowDown'. New browsers support it natively, check here.

这篇关于在JS / jQuery中绑定箭头键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！