Lia*_*iam 27 javascript cross-browser dom-events
在Firefox 3.5中测试JavaScript时,我可以访问常量,例如KeyEvent.DOM_VK_D但不能访问Google Chrome.是否有跨浏览器访问这些常量的方法？
Gum*_*mbo 47
如果KeyEvent对象不存在,您可以定义它:
if (typeof KeyEvent == "undefined") {
var KeyEvent = {
DOM_VK_CANCEL: 3,
DOM_VK_HELP: 6,
DOM_VK_BACK_SPACE: 8,
DOM_VK_TAB: 9,
DOM_VK_CLEAR: 12,
DOM_VK_RETURN: 13,
DOM_VK_ENTER: 14,
DOM_VK_SHIFT: 16,
DOM_VK_CONTROL: 17,
DOM_VK_ALT: 18,
DOM_VK_PAUSE: 19,
DOM_VK_CAPS_LOCK: 20,
DOM_VK_ESCAPE: 27,
DOM_VK_SPACE: 32,
DOM_VK_PAGE_UP: 33,
DOM_VK_PAGE_DOWN: 34,
DOM_VK_END: 35,
DOM_VK_HOME: 36,
DOM_VK_LEFT: 37,
DOM_VK_UP: 38,
DOM_VK_RIGHT: 39,
DOM_VK_DOWN: 40,
DOM_VK_PRINTSCREEN: 44,
DOM_VK_INSERT: 45,
DOM_VK_DELETE: 46,
DOM_VK_0: 48,
DOM_VK_1: 49,
DOM_VK_2: 50,
DOM_VK_3: 51,
DOM_VK_4: 52,
DOM_VK_5: 53,
DOM_VK_6: 54,
DOM_VK_7: 55,
DOM_VK_8: 56,
DOM_VK_9: 57,
DOM_VK_SEMICOLON: 59,
DOM_VK_EQUALS: 61,
DOM_VK_A: 65,
DOM_VK_B: 66,
DOM_VK_C: 67,
DOM_VK_D: 68,
DOM_VK_E: 69,
DOM_VK_F: 70,
DOM_VK_G: 71,
DOM_VK_H: 72,
DOM_VK_I: 73,
DOM_VK_J: 74,
DOM_VK_K: 75,
DOM_VK_L: 76,
DOM_VK_M: 77,
DOM_VK_N: 78,
DOM_VK_O: 79,
DOM_VK_P: 80,
DOM_VK_Q: 81,
DOM_VK_R: 82,
DOM_VK_S: 83,
DOM_VK_T: 84,
DOM_VK_U: 85,
DOM_VK_V: 86,
DOM_VK_W: 87,
DOM_VK_X: 88,
DOM_VK_Y: 89,
DOM_VK_Z: 90,
DOM_VK_CONTEXT_MENU: 93,
DOM_VK_NUMPAD0: 96,
DOM_VK_NUMPAD1: 97,
DOM_VK_NUMPAD2: 98,
DOM_VK_NUMPAD3: 99,
DOM_VK_NUMPAD4: 100,
DOM_VK_NUMPAD5: 101,
DOM_VK_NUMPAD6: 102,
DOM_VK_NUMPAD7: 103,
DOM_VK_NUMPAD8: 104,
DOM_VK_NUMPAD9: 105,
DOM_VK_MULTIPLY: 106,
DOM_VK_ADD: 107,
DOM_VK_SEPARATOR: 108,
DOM_VK_SUBTRACT: 109,
DOM_VK_DECIMAL: 110,
DOM_VK_DIVIDE: 111,
DOM_VK_F1: 112,
DOM_VK_F2: 113,
DOM_VK_F3: 114,
DOM_VK_F4: 115,
DOM_VK_F5: 116,
DOM_VK_F6: 117,
DOM_VK_F7: 118,
DOM_VK_F8: 119,
DOM_VK_F9: 120,
DOM_VK_F10: 121,
DOM_VK_F11: 122,
DOM_VK_F12: 123,
DOM_VK_F13: 124,
DOM_VK_F14: 125,
DOM_VK_F15: 126,
DOM_VK_F16: 127,
DOM_VK_F17: 128,
DOM_VK_F18: 129,
DOM_VK_F19: 130,
DOM_VK_F20: 131,
DOM_VK_F21: 132,
DOM_VK_F22: 133,
DOM_VK_F23: 134,
DOM_VK_F24: 135,
DOM_VK_NUM_LOCK: 144,
DOM_VK_SCROLL_LOCK: 145,
DOM_VK_COMMA: 188,
DOM_VK_PERIOD: 190,
DOM_VK_SLASH: 191,
DOM_VK_BACK_QUOTE: 192,
DOM_VK_OPEN_BRACKET: 219,
DOM_VK_BACK_SLASH: 220,
DOM_VK_CLOSE_BRACKET: 221,
DOM_VK_QUOTE: 222,
DOM_VK_META: 224
};
}
Mar*_*din 13
Web浏览器中键盘输入的标准化过程仅在过去15年左右持续进行.事实证明,这不是一个简单的问题.
在2010该KeyEvent接口在一个工作草案,的KeyboardEvent换成了W3C.DOM_VK_密钥代码列表没有看到进一步的标准化工作,并且不太可能保持一致:一些关键代码在平台之间,甚至在同一平台上的浏览器之间也不同.KeyboardEvent接口试图为关键事件引入一些一致性.
但是,在撰写此评论时,KeyboardEvent的浏览器兼容性可能被描述为灾难区域.很少有浏览器支持KeyboardEvent.key,但希望将来可以更加一致地使用它.它是一个描述键的字符串,而不是数值.建议值列表是W3C工作草案.
我为KeyboardEvent.key找到了一个垫片,但它显然目前不符合规范.
这个故事仍然可能会有一个圆满的结局.
您也可以使用轻量级的npm包keycode-js.它包含所有这些键码常量的列表,并且易于使用.
以下是您使用它的方法,https://github.com/kabirbaidhya/keycode-js#usage
window.addEventListener('keyup', function(e) {
if (e.keyCode === KeyCode.KEY_RETURN) {
console.log('It was the Return key.');
} else {
console.log('It was any other key.');
}
});
这是支持的常量列表.
这个包只不过是一个像这样的密钥代码列表:
exports.KEY_CANCEL = 3;
exports.KEY_HELP = 6;
exports.KEY_BACK_SPACE = 8;
exports.KEY_TAB = 9;
exports.KEY_CLEAR = 12;
exports.KEY_RETURN = 13;
exports.KEY_ENTER = 14;
exports.KEY_SHIFT = 16;
exports.KEY_CONTROL = 17;
exports.KEY_ALT = 18;
exports.KEY_PAUSE = 19;
exports.KEY_CAPS_LOCK = 20;
exports.KEY_ESCAPE = 27;
exports.KEY_SPACE = 32;
exports.KEY_PAGE_UP = 33;
exports.KEY_PAGE_DOWN = 34;
exports.KEY_END = 35;
exports.KEY_HOME = 36;
exports.KEY_LEFT = 37;
exports.KEY_UP = 38;
exports.KEY_RIGHT = 39;
exports.KEY_DOWN = 40;
exports.KEY_PRINTSCREEN = 44;
exports.KEY_INSERT = 45;
exports.KEY_DELETE = 46;
exports.KEY_0 = 48;
exports.KEY_1 = 49;
exports.KEY_2 = 50;
exports.KEY_3 = 51;
exports.KEY_4 = 52;
exports.KEY_5 = 53;
exports.KEY_6 = 54;
exports.KEY_7 = 55;
exports.KEY_8 = 56;
exports.KEY_9 = 57;
exports.KEY_SEMICOLON = 59;
exports.KEY_EQUALS = 61;
exports.KEY_A = 65;
exports.KEY_B = 66;
exports.KEY_C = 67;
exports.KEY_D = 68;
exports.KEY_E = 69;
exports.KEY_F = 70;
exports.KEY_G = 71;
exports.KEY_H = 72;
exports.KEY_I = 73;
exports.KEY_J = 74;
exports.KEY_K = 75;
exports.KEY_L = 76;
exports.KEY_M = 77;
exports.KEY_N = 78;
exports.KEY_O = 79;
exports.KEY_P = 80;
exports.KEY_Q = 81;
exports.KEY_R = 82;
exports.KEY_S = 83;
exports.KEY_T = 84;
exports.KEY_U = 85;
exports.KEY_V = 86;
exports.KEY_W = 87;
exports.KEY_X = 88;
exports.KEY_Y = 89;
exports.KEY_Z = 90;
exports.KEY_CONTEXT_MENU = 93;
exports.KEY_NUMPAD0 = 96;
exports.KEY_NUMPAD1 = 97;
exports.KEY_NUMPAD2 = 98;
exports.KEY_NUMPAD3 = 99;
exports.KEY_NUMPAD4 = 100;
exports.KEY_NUMPAD5 = 101;
exports.KEY_NUMPAD6 = 102;
exports.KEY_NUMPAD7 = 103;
exports.KEY_NUMPAD8 = 104;
exports.KEY_NUMPAD9 = 105;
exports.KEY_MULTIPLY = 106;
exports.KEY_ADD = 107;
exports.KEY_SEPARATOR = 108;
exports.KEY_SUBTRACT = 109;
exports.KEY_DECIMAL = 110;
exports.KEY_DIVIDE = 111;
exports.KEY_F1 = 112;
exports.KEY_F2 = 113;
exports.KEY_F3 = 114;
exports.KEY_F4 = 115;
exports.KEY_F5 = 116;
exports.KEY_F6 = 117;
exports.KEY_F7 = 118;
exports.KEY_F8 = 119;
exports.KEY_F9 = 120;
exports.KEY_F10 = 121;
exports.KEY_F11 = 122;
exports.KEY_F12 = 123;
exports.KEY_F13 = 124;
exports.KEY_F14 = 125;
exports.KEY_F15 = 126;
exports.KEY_F16 = 127;
exports.KEY_F17 = 128;
exports.KEY_F18 = 129;
exports.KEY_F19 = 130;
exports.KEY_F20 = 131;
exports.KEY_F21 = 132;
exports.KEY_F22 = 133;
exports.KEY_F23 = 134;
exports.KEY_F24 = 135;
exports.KEY_NUM_LOCK = 144;
exports.KEY_SCROLL_LOCK = 145;
exports.KEY_COMMA = 188;
exports.KEY_PERIOD = 190;
exports.KEY_SLASH = 191;
exports.KEY_BACK_QUOTE = 192;
exports.KEY_OPEN_BRACKET = 219;
exports.KEY_BACK_SLASH = 220;
exports.KEY_CLOSE_BRACKET = 221;
exports.KEY_QUOTE = 222;
exports.KEY_META = 224;