keyup event is working slow performance

问题

My example:

$(document).on('keyup', '[contenteditable=true]', function (e) {
        
    let _this = $(this), text = _this.text();

    if (text.length === 1) {
        let span = $('<span>').text(text);
        _this.html(span);
    }

    console.log(_this.html());

});

[contenteditable=true] {
  border: 1px solid #ccc;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<div contenteditable="true"></div>

My problem: If I type some text (more than 1 character) with normal speed into the div, code works fine. But, when I try to type text with fast speed, no <span> tag was appended to the div.

How can I fix that?

回答1:

You could use input event instead it's more efficient when you trach user inputs, check example below :

$(document).on('input', '[contenteditable=true]', function (e) {
    //Your logic
});

Or also keypress as T.J. Crowder comment's says :

$(document).on('keypress', '[contenteditable=true]', function (e) {
    //Your logic
});

Hope this helps.

$(document).on('input', '[contenteditable=true]', function (e) {
        
    let _this = $(this), text = _this.text();

    if (text.length === 1) {
        let span = $('<span>').text(text);
        _this.html(span);
    }

    console.log(_this.html());

});

[contenteditable=true] {
  border: 1px solid #ccc;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<div contenteditable="true"></div>

来源：https://stackoverflow.com/questions/42314838/keyup-event-is-working-slow-performance