如何在JavaScript中启动键盘快捷键函数

How to fire a keyboard shortcut function in JavaScript?

本文关键字：键盘 快捷键 函数 启动 JavaScript      更新时间：2023-09-26

我的网站上有一个记录功能。如果用户点击Ctrl+Alt+R

<button type="submit" class="btn btn-primary" data-toggle="tooltip" data-placement="top" onclick="record_session()" title="Start Recording">Record</button>

在下面的函数中

function record_session(){
    //how can i trigger or initiate  ctrl+alt+r here??
}

如果使用jQuery，可以添加按键事件：

$(document).keypress(function(e) {
    if (e.which === 114 && e.ctrlKey && e.altKey) {
        record_session();
    }
});

更新：

var enable_keypress = false;
function record_session(){
    enable_keypress = true;
}
$(document).keypress(function(e) {
    if (enable_keypress) {
        if (e.which === 114 && e.ctrlKey && e.altKey) { // ctrl+alt+r
        }
    }
});

更新2

要激发键盘事件，可以使用以下命令：

jQuery:

function keydown(ctrl, alt, shift, which, key) {
    var e = $.Event("keydown");
    e.ctrlKey = ctrl;
    e.altKey = alt;
    e.shiftKey = shift;
    if (typeof which === 'string') {
        key = which;
        which = key.toUpperCase().charCodeAt(0);
    }
    e.key = key;
    e.which = e.keyCode = which;
    return e;
}
function keypress(key) {
    var e = $.Event("keypress");
    e.key = key;
    e.which = e.keyCode = 0;
    return e;
}
function shortcut({
    ctrl = false,
    alt = false,
    shift = false,
    which,
    key
}) {
    var doc = $(document.documentElement || window);
    if (typeof which === 'string') {
        key = which;
        which = key.toUpperCase().charCodeAt(0);
    }
    doc.trigger(keydown(ctrl, alt, shift, which, key));
    doc.trigger(keypress(key));
}

您可以使用快捷方式同时触发按键和按键：

shortcut({ctrl: true, alt: true, which: 'r'});

如果您有做不同事情的监听器（我在jQuery终端的测试中有这个）；

本机代码：

 function shortcut({chr, ctrlKey = false, altKey = false}) {
     var lowerChr = chr.toLowerCase();
     var upperChr = chr.toUpperCase();
     var keydownCode = upperChr.charCodeAt(0);
     var e = new KeyboardEvent("keydown", {
         key: lowerChr,
         code: "Key" + upperChr,
         ctrlKey,
         altKey,
         keyCode: keydownCode,
         which: keydownCode
     });
     var keypressCode = lowerChr.charCodeAt(0);
     document.documentElement.dispatchEvent(e);
     var e = new KeyboardEvent("keypress", {
         key: lowerChr,
         ctrlKey,
         altKey,
         charCode: keypressCode,
         keyCode: keypressCode,
         which: keypressCode
     });
     document.documentElement.dispatchEvent(e);
 }
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