I've noticed an problem when trying to catch keyboard shortcut: CTRL + an arrow.
I've handled keydown event. Now when I hold CTRL key then keydown event is fired once. If I hold an arrow (so that now I'm holding CTRL + an arrow) it doesn't fire another event. Is it forbidden from any reason? I guess I've already encountered this problem in Opera a few years ago and there was an option for it in browser.
我的结果:
holding CTRL, press an arrow -- fires event for CTRL and doesn't fire an event for an arrow
press CTRL + an arrow at once -- fires one event but only with keycode of CTRL.
holding CTRL, press a letter (eg. S) -- works as expected
press CTRL + letter (eg. S) -- works as expected
(Chrome 和 Firefox 中的结果相同。上述行为是标准吗?)
我在用着:
-
function OnKeyDown(e) { }
-
e.ctrlKey
, e. 事件的哪些属性
问题是:可能是什么问题?
您应该检查是否event.ctrlKey标志是真的,像这样:
document.getElementById('element').onkeydown = function (e) {
e = e || window.event;
var keyCode = e.keyCode || e.which,
arrow = {left: 37, up: 38, right: 39, down: 40 };
if (e.ctrlKey) {
switch (keyCode) {
case arrow.left:
//... handle Ctrl-LeftArrow
break;
//...
}
}
};
检查一个例子here.
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