javascript - 如何检测 Javascript 中的数字键盘输入

Question

我想让 Javascript 仅从数字键盘的 Enter 键而不是通常的 Enter 键响应 keypress 或 keydown 事件。根据jQuery keypress docs 中的演示，它们似乎都生成了相同的事件数据，所以我不确定这是否可能。

Answer 1

They do generate the same keystroke data, at the level of abstraction that JavaScript has access to. Remember, JavaScript lives in a sandbox (the browser) and has no direct access to the underlying hardware (there are plenty of platforms that don't have a numeric keypad at all, but do have a browser).

This cannot be done.

EDIT:

Support for this has been added for some browsers but does not seem to be universal (see the other answer).

Answer 2

现在可以将小键盘 Enter 检测为单独的键。使用 KeyboardEvent.location 属性。这样，您可以首先检查键码 13，然后检查键是否在数字键盘上，这决定了数字键盘的输入。

https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/location

例子：

    window.onkeydown=function(ev)
    {
         var e= ev || window.event,
         key = e.keyCode
         if ((key===13) && (e.location===3)) {
            console.log("got ya");
            console.log(e.location);
         }
   }