是否可以在JavaScript中以编程方式模拟按键事件?
当前回答
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'})
其他回答
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
你可以使用dispatchEvent():
function simulateKeyPress() {
var evt = document.createEvent("KeyboardEvent");
evt.initKeyboardEvent("keypress", true, true, window,
0, 0, 0, 0,
0, "e".charCodeAt(0))
var body = document.body;
var canceled = !body.dispatchEvent(evt);
if(canceled) {
// A handler called preventDefault
alert("canceled");
} else {
// None of the handlers called preventDefault
alert("not canceled");
}
}
我没有对此进行测试,但它改编自dispatchEvent()文档中的代码。您可能需要通读这些文档,以及createEvent()和initKeyEvent()的文档。
这是我找到的:
函数createKeyboardEvent(名称,键,altKey, ctrlKey, shiftKey, metaKey,气泡){ var e = new事件(name) E.key = key e.keyCode = e.key.charCodeAt(0) e.which = e.keyCode e.altKey = altKey e.ctrlKey = ctrlKey e.shiftKey = shiftKey e.metaKey = metaKey e.泡泡=泡泡 返回e } Var name = 'keydown' Var键= 'a' var event = createKeyboardEvent(name, key, false, false, false, false, true) 文档。addEventListener(name, () => {}) document.dispatchEvent(事件)
只需使用CustomEvent
Node.prototype.fire=function(type,options){
var event=new CustomEvent(type);
for(var p in options){
event[p]=options[p];
}
this.dispatchEvent(event);
}
4 ex想模拟ctrl+z
window.addEventListener("keyup",function(ev){
if(ev.ctrlKey && ev.keyCode === 90) console.log(ev); // or do smth
})
document.fire("keyup",{ctrlKey:true,keyCode:90,bubbles:true})
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>