是否可以在JavaScript中以编程方式模拟按键事件?
当前回答
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)
其他回答
只要用户按下有问题的键,你就可以存储对该even的引用,并将其用于任何HTML其他元素:
EnterKeyPressToEmulate<input class="lineEditInput" id="addr333_1" type="text" style="width:60%;right:0%;float:right" onkeydown="keyPressRecorder(event)"></input> TypeHereToEmulateKeyPress<input class="lineEditInput" id="addr333_2" type="text" style="width:60%;right:0%;float:right" onkeydown="triggerKeyPressOnNextSiblingFromWithinKeyPress(event)"> Itappears Here Too<input class="lineEditInput" id="addr333_3" type="text" style="width:60%;right:0%;float:right;" onkeydown="keyPressHandler(event)"> <script> var gZeroEvent; function keyPressRecorder(e) { gZeroEvent = e; } function triggerKeyPressOnNextSiblingFromWithinKeyPress(TTT) { if(typeof(gZeroEvent) != 'undefined') { TTT.currentTarget.nextElementSibling.dispatchEvent(gZeroEvent); keyPressHandler(TTT); } } function keyPressHandler(TTT) { if(typeof(gZeroEvent) != 'undefined') { TTT.currentTarget.value+= gZeroEvent.key; event.preventDefault(); event.stopPropagation(); } } </script>
如果你创建自己的事件,你可以设置keyCode,你可以从任何真实的键盘事件复制现有的参数(忽略目标,因为它的工作dispatchEvent)和:
ta = new KeyboardEvent('keypress',{ctrlKey:true,key:'Escape'})
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);
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);
}
如果你可以使用jQuery 1.3.1:
函数simulateKeyPress(字符){ jQuery.event.trigger ({ 类型:键盘按键, 其中:character.charCodeAt (0) }); } $(函数(){ 美元(的身体).keypress(函数(e) { 警报(e.which); }); simulateKeyPress(“e”); }); < script src = " https://cdnjs.cloudflare.com/ajax/libs/jquery/1.3.1/jquery.min.js " > > < /脚本
这就是我在chrome中使用js/typescript所做的尝试。多亏了 这是灵感的答案。
var x = document.querySelector('input');
var keyboardEvent = new KeyboardEvent("keypress", { bubbles: true });
// you can try charCode or keyCode but they are deprecated
Object.defineProperty(keyboardEvent, "key", {
get() {
return "Enter";
},
});
x.dispatchEvent(keyboardEvent);
{ // example document.querySelector('input').addEventListener("keypress", e => console.log("keypress", e.key)) // unfortunatelly doesn't trigger submit document.querySelector('form').addEventListener("submit", e => { e.preventDefault(); console.log("submit") }) } var x = document.querySelector('input'); var keyboardEvent = new KeyboardEvent("keypress", { bubbles: true }); // you can try charCode or keyCode but they are deprecated Object.defineProperty(keyboardEvent, "key", { get() { return "Enter"; }, }); x.dispatchEvent(keyboardEvent); <form> <input> </form>