Question

如何以编程方式触发将which属性设置为所需值的Chrome上的keydown事件？

尝试

new KeyboardEvent('keydown', {
    'which':65,
    'charCode':65,
    'keyCode':65,
    'key':"a",
    'code':"KeyA",
});

但是当在输入的onKeyDown处理程序中接收该属性时，该事件的which,charCode and keyCode等于0。 key已正确设置为a。

感谢您的帮助

Answer 1

在Chrome中，这些事件属性的默认值为0且不可写（由于它们已被弃用）。您必须删除本机属性，然后重新创建它们：

＆＃13;

var ke = new KeyboardEvent('keydown', {
    'key':"a",
    'code':"KeyA",
});

// Delete native event read-only properties with default values of 0
delete ke.keyCode;
delete ke.charCode;
delete ke.which;

// Create new custom properties that are read/write:
Object.defineProperty(ke, "keyCode", {"value" : 65});
Object.defineProperty(ke, "charCode", {"value" : 65});
Object.defineProperty(ke, "which", {"value" : 65});

var el = document.getElementById("key");

el.addEventListener("keydown", function(evt){
  console.log(evt.key, evt.code, evt.keyCode, evt.charCode, evt.which);
});

el.dispatchEvent(ke);

＆＃13;

<input type="text" id="key">

＆＃13;

使用`which`属性以编程方式触发keydown事件

1 个答案: