从对象动态设置 Mousetrap.bind() 组合键

Question

我正在从后端获取包含有关键盘快捷键的信息的数据。这是我将收到的一个愚蠢的版本：

    { code: "r", message: "test R" },
    { code: "s", message: "test S" },
    { code: "c", message: "test C"}

"代码"指定哪个键将激活键盘快捷键，消息是将粘贴到输入框中的内容。

我正在使用 Mousetrap 库，它允许我编写如下函数：

Mousetrap.bind('shift+^+r', function () {
    alert("test");
});

我的问题是：有没有办法根据带回的数据在运行时编写这些函数？因此，对于 JSON 对象中的每个项目，都需要一个函数来处理快捷方式。

我试过这个：

    var html = document.getElementById("shortcuts").innerHTML;
    document.getElementById("shortcuts").innerHTML = html + "<script> Mousetrap.bind('shift+^+r', function () { alert('test) })); </script>"

我不知道这是否是好的做法，因为我对JS还很陌生，但这是我唯一能想到的。不过它不起作用。

Answer 1

当然。听起来很简单。只需创建一个单独的函数接受对象，获取code和message属性并在运行时调用Mousetrap.bind(str, func)

function bindKey(input){
    const code = input.code;
    const message = input.message;
    const bindStr = "shift+^+" + code; //idk if you need shift here but modify as needed
    Mousetrap.bind(bindStr, function(){
          alert(message);
    });
}

使用方式

bindKey({code: "r", message: "test R"});
bindKey({code: "c", message: "test C"});
bindKey({code: "d", message: "test D"});

如果你有一个对象数组，只需遍历它们并调用bindKey()

myArray.forEach(bindKey);
// or
for (const i of myArray) bindKey(i);

无需编写脚本元素。只需编写函数并在运行时调用它。为什么需要渲染脚本标签超出了我的范围。

---

下面测试

function bindKey(input){
   const code = input.code;
   const message = input.message;
   const bindStr = "shift+^+" + code; //idk if you need shift here but modify as needed
    
    Mousetrap.bind(bindStr, function(){
          console.log(message);
    });
}
    
bindKey({code: "r", message: "test R"});
bindKey({code: "c", message: "test C"});
bindKey({code: "d", message: "test D"});

<script src="https://craig.global.ssl.fastly.net/js/mousetrap/mousetrap.min.js"></script>

Answer 2

您可以遍历所有对象，将键与每个对象的code绑定后，您可以搜索数组并选择元素以显示消息。适度实施：

var data = [{code:"r",message:"test R"},{code:"s",message:"test S"},{code:"c",message:"test C"}];
//use forEach to go through each item in data
data.forEach(key => {
  //call MouseTrap bind on key.code, key is one of the element in data
  Mousetrap.bind('shift+^+' + key.code, (e) => {
    //e is the event variable from the keystroke
    
    //data.find will find the element which has the key value(e.key) from the event
    //converting into lowercase because data is in lowercase too
    var element = data.find(d => {
      //check if code of the element matches e.key
      if (d.code == e.key.toLowerCase()) return d;
    });
    //log element.message
    console.log(element.message);
  });
});

<script src="https://craig.global.ssl.fastly.net/js/mousetrap/mousetrap.min.js"></script>

---

@Bergi的建议@AZ_：

var data = [{code:"r",message:"test R"},{code:"s",message:"test S"},{code:"c",message:"test C"}];
data.forEach(({code, message}) => Mousetrap.bind(`shift+^+${code}`, () => console.log(message)));

<script src="https://craig.global.ssl.fastly.net/js/mousetrap/mousetrap.min.js"></script>