如何显示jQuery中的加载微调器? [英] How to show loading spinner in jQuery?

问题描述

在 Prototype 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，我可以使用以下命令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中一样将加载微调器附加到此命令上?

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

推荐答案

有两种方法.我的首选方式是将一个函数附加到元素本身上的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();
    })
;

无论何时执行任何Ajax调用，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仅应附加到document.这会将上面的代码段转换为:

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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