如何挂钩IE键盘事件？ [英] How to hook IE keyboard event?

问题描述

我试图在用户尝试按下swf文件上的某些键组合时禁用浏览器快捷方式。虽然我可以在firefox中实现这一点，但是下面的代码在ie 8中不起作用。如果焦点不在swf文件上，下面的代码可以挂钩键盘事件。但是，我需要的是当用户操作swf文件时挂钩键盘事件。

I am trying to disable browser shortcuts while user tries to press some combination of keys on the swf file. Although I can achieve this in firefox, below code does not function in ie 8. Below code is able to hook the keyboard events if focus is not on the swf file. However, what I need is hooking keyboard events when user operates on swf file.

function hookKeyboardEvents(e) {

    alert("hooked key");
    // get key code
    var key_code = (window.event) ? event.keyCode : e.which;

    // case :if it is IE event
    if (window.event)
    {
        if (!event.shiftKey && !event.ctrlKey && !event.altKey) {
            window.event.returnValue = null;
            event.keyCode=0;
        }       
    }
    // case: if it is firefox event
    else
        e.preventDefault();

    document[flashId].keyDown(key_code);
}

window.document.onkeydown = hookKeyboardEvents;

当焦点在swf文件上时，上面的代码永远不会执行。

Above code never executes when focus is on swf file.

推荐答案

document.body.accessKey = String.fromCharCode(e.keyCode);

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