用户完成键入而不是按键时运行javascript函数？ [英] Run javascript function when user finishes typing instead of on key up?

问题描述

我想在用户输入文本框时触发ajax请求。我不希望它在每次用户键入字母时都运行该函数，因为这会导致大量的ajax请求，但是我不希望他们必须点击输入按钮。

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.

有没有办法可以检测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！
Dave

Using jQuery here! Dave

推荐答案

所以，我猜猜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，让我们在用户释放密钥时启动计时器，并在按下密钥时清除它。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.

做出一些假设......

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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