如何在 jQuery 中显示加载微调器? [英] How to show loading spinner in jQuery?

问题描述

在原型中，我可以使用以下代码显示正在加载..."图像:

In Prototype I can show a "loading..." image with this code:

var myAjax = new Ajax.Request( url, {method: 'get', parameters: pars, 
onLoading: showLoad, onComplete: showResponse} );

function showLoad () {
    ...
}

在 jQuery 中，我可以将服务器页面加载到元素中:

In jQuery, I can load a server page into an element with this:

$('#message').load('index.php?pg=ajaxFlashcard');

但是如何像在 Prototype 中那样将加载微调器附加到此命令?

but how do I attach a loading spinner to this command as I did in Prototype?

推荐答案

有几种方法.我的首选方法是将函数附加到元素本身的 ajaxStart/Stop 事件.

There are a couple of ways. My preferred way is to attach a function to the ajaxStart/Stop events on the element itself.

$('#loadingDiv')
    .hide()  // Hide it initially
    .ajaxStart(function() {
        $(this).show();
    })
    .ajaxStop(function() {
        $(this).hide();
    })
;

每当您执行任何 Ajax 调用时，ajaxStart/Stop 函数都会触发.

The ajaxStart/Stop functions will fire whenever you do any Ajax calls.

更新:从 jQuery 1.8 开始，文档指出 .ajaxStart/Stop 应该只附加到 document.这会将上述代码段转换为:

Update: As of jQuery 1.8, the documentation states that .ajaxStart/Stop should only be attached to document. This would transform the above snippet to:

var $loading = $('#loadingDiv').hide();
$(document)
  .ajaxStart(function () {
    $loading.show();
  })
  .ajaxStop(function () {
    $loading.hide();
  });

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