onchange之后的Ajax [关闭]

Question

Closed. This question is opinion-based. It is not currently accepting answers.

                </div>
            </div>
        </div>
                <hr class="my12 outline-none baw0 bb bc-powder-2">
            <div class="grid fw-nowrap fc-black-600">
                    <div class="grid--cell mr8">
                        <svg aria-hidden="true" class="svg-icon iconLightbulb" width="18" height="18" viewbox="0 0 18 18"><path d="M9.5.5a.5.5 0 0 0-1 0v.25a.5.5 0 0 0 1 0V.5zm5.6 2.1a.5.5 0 0 0-.7-.7l-.25.25a.5.5 0 0 0 .7.7l.25-.25zM1 7.5c0-.28.22-.5.5-.5H2a.5.5 0 0 1 0 1h-.5a.5.5 0 0 1-.5-.5zm14.5 0c0-.28.22-.5.5-.5h.5a.5.5 0 0 1 0 1H16a.5.5 0 0 1-.5-.5zM2.9 1.9c.2-.2.5-.2.7 0l.25.25a.5.5 0 1 1-.7.7L2.9 2.6a.5.5 0 0 1 0-.7z" fill-opacity=".4"></path><path opacity=".4" d="M7 16h4v1a1 1 0 0 1-1 1H8a1 1 0 0 1-1-1v-1z" fill="#3F3F3F"></path><path d="M15 8a6 6 0 0 1-3.5 5.46V14a1 1 0 0 1-1 1h-3a1 1 0 0 1-1-1v-.54A6 6 0 1 1 15 8zm-4.15-3.85a.5.5 0 0 0-.7.7l2 2a.5.5 0 0 0 .7-.7l-2-2z" fill="#FFC166"></path></svg>
                    </div>
                <div class="grid--cell lh-md">
                    <p class="mb0">
                        <b>Want to improve this question?</b> Update the question so it can be answered with facts and citations by <a href="/posts/23568926/edit">editing this post</a>.
                    </p>
                    <p class="mb0 mt6">Closed <span title="2014-05-09 17:06:15Z" class="relativetime">5 years ago</span>.</p>
                </div>
            </div>
    </aside>

I'm trying to create a textarea that trigger an ajax request onchange. The point is that I'm worried about queueing too many requests to the server, because that request is going to save content of this textarea in a db. Actually my idea was something about creating a sort of timer, which, after a couple of seconds after the last onchange, start the ajax request to save the textarea data. The point is that I don't have any clue if it's a good idea, and also, I still don't figure out a code to write down. I'm using JQuery.

</div>

Answer 1

Try as below, reduce the number of calls by delaying the ajax call for a few seconds to see if the user is going to keep typing

var timeoutId; 
$('#textarea').on('change', function() {
  if(timeoutId){ 
    // prevent last timeout from sending the ajax call
    clearTimeout(timeoutId);
    timeoutId = 0;
  }
  timeoutId =setTimeout(submitFormAjax, 200);
   return false;
});
function submitFormAjax() {
    $.ajax({
        type:"POST",
        url:"ajax.php",
        data:$('#textarea').val(),
        success:function(data) {
            $("#result").html(data);
        }
    });
}