jQuery keypress事件等待0.5秒，用于另一个用户按键

I'm currently developing a live search for my website and I want to decrease some unnecessary request with some simple jQuery (of course I have a back-end-flood-control). I've got a keydown-event-listener for my search-field. This listener currenty only fires the ajax command for the php search-function if val().length is >= 3.

我正在为我的网站开发一个实时搜索，我想用一些简单的jQuery减少一些不必要的请求（当然我有一个后端泛洪控制）。我的搜索字段有一个keydown-event-listener。如果val（）。length> = 3，则此侦听器currenty仅触发php搜索功能的ajax命令。

But now I want an additional condition. So when the length is >= 3, I want to wait for about 0.5s or so if the user is performing another keypress. If he does, the function should not be called and I want the listener to wait another 0.5s and wait again for more user-input, and so on. How do I realize a function like that?

但现在我想要一个额外的条件。因此，当长度> = 3时，如果用户正在执行另一次按键，我想等待约0.5秒左右。如果他这样做，则不应该调用该函数，并且我希望监听器再等待0.5秒并再次等待更多用户输入，依此类推。我如何实现这样的功能？

1 个解决方案

#1

var timeout;

$('#yousearchbox').on('keyup',function(){
  //if you already have a timout, clear it
  if(timeout){ clearTimeout(timeout);}

  //start new time, to perform ajax stuff in 500ms
  timeout = setTimeout(function() {
   //your ajax stuff
  },500);
})