问题描述

我想在用户输入完文本框后触发 ajax 请求.我不希望它在每次用户输入字母时都运行该函数，因为这会导致大量的 ajax 请求，但我也不希望他们必须点击 enter 按钮.

I want to trigger an ajax request when the user has finished typing in a text box. I don't want it to run the function on every time the user types a letter because that would result in A LOT of ajax requests, however I don't want them to have to hit the enter button either.

有没有办法让我可以检测到用户何时完成输入然后执行 ajax 请求?

Is there a way so I can detect when the user has finished typing and then do the ajax request?

在这里使用 jQuery！戴夫

Using jQuery here! Dave

推荐答案

所以，我猜想完成输入意味着你只需停一会儿，比如 5 秒.因此，考虑到这一点，让我们在用户释放一个键时启动一个计时器，并在他们按下一个键时清除它.我决定有问题的输入是#myInput.

So, I'm going to guess finish typing means you just stop for a while, say 5 seconds. So with that in mind, lets start a timer when the user releases a key and clear it when they press one. I decided the input in question will be #myInput.

做一些假设......

Making a few assumptions...

//setup before functions
var typingTimer;                //timer identifier
var doneTypingInterval = 5000;  //time in ms, 5 second for example
var $input = $('#myInput');

//on keyup, start the countdown
$input.on('keyup', function () {
  clearTimeout(typingTimer);
  typingTimer = setTimeout(doneTyping, doneTypingInterval);
});

//on keydown, clear the countdown 
$input.on('keydown', function () {
  clearTimeout(typingTimer);
});

//user is "finished typing," do something
function doneTyping () {
  //do something
}

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