使onKeyDown触发HTML按钮的onClick事件 [英] Make onKeyDown trigger an HTML button's onClick event
问题描述
我有一个名为Calculator的基本HTML表单，带有一个名为"btnOne"的按钮.我想要的是当用户按下键盘上的"1"键时，发生"btnOne" HTML按钮的onClick事件.
I have a basic HTML form named Calculator, with a button named "btnOne". What I want is for when the user presses the "1" key on the keyboard, the "btnOne" HTML button's onClick event to occur.
为尝试实现此目的，我将此函数放置在文档的Head标签中:
To attempt to accomplish this, I placed this function in the Head tag of my document:
<head>
<SCRIPT LANGUAGE="JavaScript">
//other functions...
document.onkeydown = function(e){
if (!e) e = window.event;
if(e.keycode == '49') {
document.Calculator.btnOne.click();
}
return false;
}
</SCRIPT>
</head>
我只是将这段代码放在错误的位置吗?我还需要做些其他的事情才能使函数运行吗?我真的是Web开发的初学者，不知道我在做什么！当然，一旦我弄清楚如何使此按钮起作用，我将为所有其他按钮添加if语句.
Am I just putting this snippet in the wrong spot? Is there something else I need to do to make the function run? I'm really a beginner with web development and don't know what I'm doing! Of course, once I get figured out how to get this button to work, I will add if statements for all of the other buttons.
推荐答案
签出 http://api .jquery.com/category/events/，以更轻松，更简洁的方式编写代码.您拥有的基本上是正确的，尽管您最好将其包装在文档就绪事件中，以使事件在dom加载后 绑定.
check out http://api.jquery.com/category/events/ for a much easier and cleaner way to write this. What you have is basically right, though you'd do well to wrap this in a document ready event, so that the events bind after the dom has loaded.
使用jQuery，您的代码将如下所示
with jQuery your code would look something like this
jQuery(function() {
jQuery(window).keypress(function(e){
if (e.which === 49) {
jQuery("#btnOne").click();
}
});
})
这里有一个工作的JS小提琴，将对此进行演示
heres a working JS Fiddle that will demonstrate this
但是，将点击的事件处理程序抽象到参数化函数中可能是个好主意，这样您就不必
However, its probably a good idea to abstract out the event handler for the click into a parameterized function so that you dont have
jQuery('#btnOne').click(function(){
//some code
});
jQuery('#btnTwo').click(function(){
//some similar code
});
jQuery('#btnThree').click(function(){
//some more similar code
});
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