JQuery 或 JavaScript：如何确定在单击锚标记超链接时是否按下了 shift 键？
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JQuery or JavaScript: How determine if shift key being pressed while clicking anchor tag hyperlink?
提问by Pete Alvin
I have an anchor tag that calls a JavaScript function.
我有一个调用 JavaScript 函数的锚标记。
With or without JQuery how do I determine if the shift key is down while the link is clicked?
使用或不使用 JQuery 如何确定单击链接时 shift 键是否按下？
The following code does NOT work because keypress is only fired if a "real key" (not the shift key) is pressed. (I was hoping it would fire if just the shift key alone was pressed.)
以下代码不起作用，因为只有在按下“真实键”（而不是 shift 键）时才会触发 keypress。（我希望如果只按下 shift 键它会触发。）
var shifted = false;
$(function() {
$(document).keypress(function(e) {
shifted = e.shiftKey;
alert('shiftkey='+e.shiftkey);
});
$(document).keyup(function(e) {
shifted = false;
});
}
...
function myfunction() {
//shift is always false b/c keypress not fired above
}
回答by hluk
$(document).on('keyup keydown', function(e){shifted = e.shiftKey} );
回答by Jsinh
Here is the key code for each key stroke in JavaScript. You can use that and detect if the user has pressed the Shift key.
这是 JavaScript 中每个击键的关键代码。您可以使用它并检测用户是否按下了 Shift 键。
backspace 8
tab 9
enter 13
shift 16
ctrl 17
alt 18
pause/break 19
caps lock 20
escape 27
page up 33
page down 34
end 35
home 36
left arrow 37
up arrow 38
right arrow 39
down arrow 40
insert 45
delete 46
0 48
1 49
2 50
3 51
4 52
5 53
6 54
7 55
8 56
9 57
a 65
b 66
c 67
d 68
e 69
f 70
g 71
h 72
i 73
j 74
k 75
l 76
m 77
n 78
o 79
p 80
q 81
r 82
s 83
t 84
u 85
v 86
w 87
x 88
y 89
z 90
left window key 91
right window key 92
select key 93
numpad 0 96
numpad 1 97
numpad 2 98
numpad 3 99
numpad 4 100
numpad 5 101
numpad 6 102
numpad 7 103
numpad 8 104
numpad 9 105
multiply 106
add 107
subtract 109
decimal point 110
divide 111
f1 112
f2 113
f3 114
f4 115
f5 116
f6 117
f7 118
f8 119
f9 120
f10 121
f11 122
f12 123
num lock 144
scroll lock 145
semi-colon 186
equal sign 187
comma 188
dash 189
period 190
forward slash 191
grave accent 192
open bracket 219
back slash 220
close braket 221
single quote 222
Not all browsers handle the keypress event well, so use either the key up or the key down event, like this:
并非所有浏览器都能很好地处理 keypress 事件，因此使用 key up 或 key down 事件，如下所示：
$(document).keydown(function (e) {
if (e.keyCode == 16) {
alert(e.which + " or Shift was pressed");
}
});
回答by Pointy
For mouse events, I know that in Firefox at least the "shiftKey" property on the event object will tell you if the shift key is down. It's documented at MSDN but I haven't tried it in forever so I don't recall if IE does this right.
对于鼠标事件，我知道在 Firefox 中，至少事件对象上的“shiftKey”属性会告诉您 shift 键是否按下。它记录在 MSDN 上，但我一直没有尝试过，所以我不记得 IE 是否正确执行此操作。
Thus you should be able to check for "shiftKey" on the event object in your "click" handler.
因此，您应该能够在“单击”处理程序中检查事件对象上的“shiftKey”。
回答by tonycoupland
I had a similar problem, trying to capture a 'shift+click' but since I was using a third party control with a callback rather than the standard clickhandler, I didn't have access to the event object and its associated e.shiftKey.
我遇到了类似的问题，试图捕获“shift+click”，但由于我使用的是带有回调的第三方控件而不是标准click处理程序，因此我无法访问事件对象及其关联的e.shiftKey.
I ended up handling the mouse down event to record the shift-ness and then using it later in my callback.
我最终处理了鼠标按下事件来记录移位，然后在我的回调中使用它。
var shiftHeld = false;
$('#control').on('mousedown', function (e) { shiftHeld = e.shiftKey });
Posted just in case someone else ends up here searching for a solution to this problem.
发布以防万一其他人最终在这里寻找解决此问题的方法。
回答by Chris Van Opstal
The keypressevent isn't triggered by all browsers when you click shiftor ctrl, but fortunately the keydownevent is.
keypress当您单击shift或 时ctrl，并非所有浏览器都会触发该事件，但幸运的keydown是该事件是。
If you switch out the keypresswith keydownyou might have better luck.
如果你换掉keypresswithkeydown你可能会有更好的运气。
回答by Corey
I have used a method to test if any specific key is pressed by storing the currently pressed key codes in an array:
我使用了一种方法通过将当前按下的键代码存储在数组中来测试是否按下了任何特定键：
var keysPressed = [],
shiftCode = 16;
$(document).on("keyup keydown", function(e) {
switch(e.type) {
case "keydown" :
keysPressed.push(e.keyCode);
break;
case "keyup" :
var idx = keysPressed.indexOf(e.keyCode);
if (idx >= 0)
keysPressed.splice(idx, 1);
break;
}
});
$("a.shifty").on("click", function(e) {
e.preventDefault();
console.log("Shift Pressed: " + (isKeyPressed(shiftCode) ? "true" : "false"));
});
function isKeyPressed(code) {
return keysPressed.indexOf(code) >= 0;
}
回答by koppor
The excellent JavaScript library KeyboardJShandles all types of key presses including the SHIFT key. It even allows specifying key combinations such as first pressing CTRL+x and then a.
优秀的 JavaScript 库KeyboardJS处理所有类型的按键，包括 SHIFT 键。它甚至允许指定组合键，例如先按 CTRL+x 然后按 a。
KeyboardJS.on('shift', function() { ...handleDown... }, function() { ...handleUp... });
If you want a simple version, head to the answer by @tonycoupland):
如果您想要一个简单的版本，请前往@tonycoupland的答案）：
var shiftHeld = false;
$('#control').on('mousedown', function (e) { shiftHeld = e.shiftKey });
回答by kaleazy
This works great for me:
这对我很有用：
function listenForShiftKey(e){
var evt = e || window.event;
if (evt.shiftKey) {
shiftKeyDown = true;
} else {
shiftKeyDown = false;
}
}
回答by bugovicsb
For checking if the shiftkey is pressed while clicking with the mouse, there is an exact property in the click event object: shiftKey (and also for ctrl and alt and meta key): https://www.w3schools.com/jsref/event_shiftkey.asp
为了检查在用鼠标单击时是否按下了 shiftkey ，单击事件对象中有一个确切的属性：shiftKey（以及 ctrl 和 alt 和元键）：https: //www.w3schools.com/jsref/event_shiftkey .asp
So using jQuery:
所以使用jQuery：
$('#anchor').on('click', function (e) {
if (e.shiftKey) {
// your code
}
});
回答by Rob Fox
A more modular approach plus the ability to keep your thisscope in the listeners:
更模块化的方法以及将this范围保持在侦听器中的能力：
var checkShift = function(fn, self) {
return function(event) {
if (event.shiftKey) {
fn.call(self, event);
}
return true;
};
};
$(document).on('keydown', checkShift(this.enterMode, this));
