使用jQuery来监听keydown事件 [英] Using jQuery to listen to keydown event

问题描述

我想检测何时按下回车键，动态注入的HTML。

I want to detect when the enter key is pressed, on HTML that will be injected dynamically.

要简单检测按下回车键的时间，我可以做：

To simply detect when the enter key is pressed, I can do:

$('#textfield').keydown(function (e){
    if(e.keyCode == 13){
        console.log('Enter was pressed');
    }
})

此代码适用于 on（），但我担心这是低效的，因为jQuery会在每次按下某个键时检查。这有什么低效的吗？

This code works for on(), but I am worried it is inefficient since jQuery will check every time a key is pressed. Is there anything inefficient about this?

$('body').on('keydown','#textfield', function(event) {
  if (event.keyCode == 13) {
    console.log('Enter was pressed');
  }
}

推荐答案

如果你想在页面的任何地方捕捉按键 -

If you want to capture the keypress anywhere on the page -

$(document).keypress(function(e) {
  if(e.which == 13) {
    // enter pressed
  }
});

不要担心这个事实这会检查每个按键，它确实没有给浏览器带来任何重大负担。

Don't worry about the fact this checks for every keypress, it really isn't putting any significant load on the browser.

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