Question

我尝试做的是运行一个选择测试框的脚本（JS）。它的ID字段名称是JMan。一旦它选择了该字段，我尝试以编程方式让我的代码执行组合键ALT+0，然后将其自身延迟5秒。顺便说一句，我在IE浏览器中执行此操作。

function myFunction() {
    var keyboardEvent = document.createEvent("keyboardEvent").;
    document.getElementById("JMan");
}
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, // viewArg: should be window
    false, // ctrlKeyArg
    true, // altKeyArgenter code here
    false, // shiftKeyArg
    false, // metaKeyArg
    48, // keyCodeArg : unsigned long the virtual key code, else 0
    0 // charCodeArgs : unsigned long the Unicode character associated with the depressed key, else 0
);
document.dispatchEvent(keyboardEvent);

Answer 1

检测事件处理程序是一种检测Alt-0的简单方法。您可能会考虑进行更复杂的检查，以确定是否在Alt和0之间按下了另一个键（即此代码会将Alt-1-0视为Alt-0或Ctrl-Alt-0，就好像它一样是Alt-0）（至少它检查你是否按下Alt-0）。这主要是因为浏览器之间的关键事件差异很大，我希望能够制作一些希望能够在大多数情况下工作的东西。

此示例中的按钮触发一个为事件处理程序捕获的最小“Alt-0”事件（或者您应该能够在窗口中键入Alt-0）。

function fireAlt0() {
    console.log("firing event");
    window.dispatchEvent(new KeyboardEvent("keydown", { key: "0", altKey: true }));
}

function detectAlt0(event) {
    if ("keydown" == event.type) { // we might want to use the same function for any of ( keydown, keypress, keyup ) events
        if (event.key == "0" && event.altKey && !event.repeat) {
            console.log("Open a window!");
        }
    }
}
    
window.addEventListener("DOMContentLoaded", function () {
    // Use keydown because keypress won't fire for the Alt-0 combination (since it doesn't produce a visible character)
    window.addEventListener("keydown", detectAlt0, false);
    document.getElementById("button").addEventListener("click", fireAlt0, false);
}, false);

<button id="button">fireAlt0</button>

以编程方式使用JavaScript按Alt 0

1 个答案: