jquery - Loading image which waiting for AJAX request

Question

I have the following script which requests data through AJAX:

 $(document).ready(function(){
        $('#input').keyup(function(){
            sendValue($(this).val());     
        }); 

    });
    function sendValue(str){
        $.post("ajax.php",{ sendValue: str },
        function(data){
            $('#display').html(data.returnValue);
        }, "json");

    }

I just want to show a DIV while the request is being made, and hide it when the data comes back. I've tried this:

$("#loading").ajaxStart(function(){
   $(this).show();
})
.ajaxStop(function(){
   $(this).hide();
});

But it didn't show or hide, it was always displayed.

Answer 1

工作 jsFiddle 演示

从jQuery 1.8开始，该.ajaxStart()方法只能附加到document. 所以：

$(document).ajaxStart(function(){
    $("#loading").show();
})
.ajaxStop(function(){
    $("#loading").hide();
});

---

---

参考：

• .ajaxStart()- jQuery API 文档