Chrome中的Keydown Simulation通常会触发但不是正确的键

问题描述

我想在html页面的给定textarea元素上模拟keydown事件。由于我使用的是chrome，因此我在变量上调用了 initKeyboardEvent ，并将我想要键入的keyCode传递给textarea。这是我试过的：

I want to simulate keydown events on a given textarea element in an html page. Since I am using chrome, I called initKeyboardEvent on my variable and I passed the keyCode I want to type into the textarea. Here is what I tried:

var keyEvent = document.createEvent('KeyboardEvent');
keyEvent.initKeyboardEvent('keydown', true, false, null, 0, false, 0, false, 77, 0);
inputNode.dispatchEvent(keyEvent);

在此代码中，我输入字母 m 但是textarea只获取keyCode 13 ，它是 Enter 键。所以，我尝试了一个我在网上看到的覆盖代码，它将值设置为keyCodeVal，但没有成功

In this code I'm typing the letter m however the textarea is only getting the keyCode 13 which is the Enter key. So, I tried an override code I saw online that sets the value to keyCodeVal, but with no success

var keyEvent = document.createEvent('KeyboardEvent');
Object.defineProperty(keyEvent, 'keyCode', {
                         get : function() {
                                 return this.keyCodeVal;
                         }
                        });
keyEvent.initKeyboardEvent('keydown', true, false, null, 0, false, 0, false, 77, 0);
keyEvent.keyCodeVal = 77;
inputNode.dispatchEvent(keyEvent);

有没有人知道如何设置keyCode值？

Does anyone have an idea how to set the keyCode value?

推荐答案

非常非常接近...

您只需要重写'which'属性。以下是一些示例代码：

You just needed to override the 'which' property. Here's some sample code:

Podium = {};
Podium.keydown = function(k) {
    var oEvent = document.createEvent('KeyboardEvent');

    // Chromium Hack
    Object.defineProperty(oEvent, 'keyCode', {
                get : function() {
                    return this.keyCodeVal;
                }
    });
    Object.defineProperty(oEvent, 'which', {
                get : function() {
                    return this.keyCodeVal;
                }
    });

    if (oEvent.initKeyboardEvent) {
        oEvent.initKeyboardEvent("keydown", true, true, document.defaultView, false, false, false, false, k, k);
    } else {
        oEvent.initKeyEvent("keydown", true, true, document.defaultView, false, false, false, false, k, 0);
    }

    oEvent.keyCodeVal = k;

    if (oEvent.keyCode !== k) {
        alert("keyCode mismatch " + oEvent.keyCode + "(" + oEvent.which + ")");
    }

    document.dispatchEvent(oEvent);
}

示例用法：

Sample usage:

Podium.keydown(65);

注意：此代码不适用于IE，Safari或其他浏览器。那么，也许与Firefox。 YMMV。

Note: this code is not designed to work in IE, Safari, or other browsers. Well, maybe with Firefox. YMMV.

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