是否可以在JavaScript中以编程方式模拟按键事件?
当前回答
由于在控制台上下文中易于使用,它曾经是单行的。但可能还是有用的。
Var pressthiskey = "q"/* <——q为例*/; var e = new事件("keydown"); E.key =按下这个键; e.keyCode = e.key.charCodeAt(0); e.which = e.keyCode; e.altKey = false; e.ctrlKey = true; e.shiftKey = false; e.metaKey = false; E.bubbles = true; document.dispatchEvent (e);
其他回答
让它工作的关键部分是认识到charCode, keyCode和这些都是不推荐的方法。因此,如果处理按键事件的代码使用这三个中的任何一个,那么它将收到一个伪答案(例如,默认值为0)。
只要使用非弃用的方法(如key)访问按键事件,就应该没问题。
为了完成,我添加了触发事件的基本Javascript代码:
const rightArrowKey = 39 const event = new KeyboardEvent('keydown',{'key':rightArrowKey}) document.dispatchEvent(事件)
这种方法支持跨浏览器更改键代码的值。 源
var $textBox = $("#myTextBox");
var press = jQuery.Event("keypress");
press.altGraphKey = false;
press.altKey = false;
press.bubbles = true;
press.cancelBubble = false;
press.cancelable = true;
press.charCode = 13;
press.clipboardData = undefined;
press.ctrlKey = false;
press.currentTarget = $textBox[0];
press.defaultPrevented = false;
press.detail = 0;
press.eventPhase = 2;
press.keyCode = 13;
press.keyIdentifier = "";
press.keyLocation = 0;
press.layerX = 0;
press.layerY = 0;
press.metaKey = false;
press.pageX = 0;
press.pageY = 0;
press.returnValue = true;
press.shiftKey = false;
press.srcElement = $textBox[0];
press.target = $textBox[0];
press.type = "keypress";
press.view = Window;
press.which = 13;
$textBox.trigger(press);
一个非jquery版本,工作在webkit和gecko:
var keyboardEvent = document.createEvent('KeyboardEvent'); var initMethod = typeof keyboardEvent.initKeyboardEvent !== 'undefined' ? 'initKeyboardEvent' : 'initKeyEvent'; keyboardEvent[initMethod]( 'keydown', // event type: keydown, keyup, keypress true, // bubbles true, // cancelable window, // view: should be window false, // ctrlKey false, // altKey false, // shiftKey false, // metaKey 40, // keyCode: unsigned long - the virtual key code, else 0 0, // charCode: unsigned long - the Unicode character associated with the depressed key, else 0 ); document.dispatchEvent(keyboardEvent);
这里有一个真正有用的库:https://cdn.rawgit.com/ccampbell/mousetrap/2e5c2a8adbe80a89050aaf4e02c45f02f1cc12d4/tests/libs/key-event.js
我不知道它是从哪里来的,但它是有帮助的。它向window添加了一个.simulate()方法。你可以简单地用KeyEvent。simulate(0,13)用于模拟enter或KeyEvent。为'Q'模拟(81,81)。
我在https://github.com/ccampbell/mousetrap/tree/master/tests上买的。
你可以用下面的代码模拟输入密码:
铬测试100%工作
DoCustomEvent('password', '#loginpin');
function DoCustomEvent(ct, elem){
var key;
var pressEvent = document.createEvent("CustomEvent");
pressEvent.initCustomEvent("keypress", true, false);
for (var i =0; i < ct.length; ++i)
{
key = ct.charCodeAt(i);
pressEvent.bubbles = true;
pressEvent.cancelBubble = false;
pressEvent.returnValue = true;
pressEvent.key = ct.charAt(i);
pressEvent.keyCode = key;
pressEvent.which = key;
pressEvent.charCode = key;
pressEvent.shiftKey = false;
pressEvent.ctrlKey = false;
pressEvent.metaKey = false;
document.querySelector(elem).focus();
//keypress //beforeinput //input //sendkeys //select
setTimeout(function() {
var e = new window.KeyboardEvent('keypress', pressEvent);
document.activeElement.dispatchEvent(e);
e = new window.KeyboardEvent('input', pressEvent);
document.activeElement.dispatchEvent(e);
}, 0);
document.querySelector(elem).value = document.querySelector(elem).value + ct.charAt(i);
}