如何提交一个Ajax请求之前的页面加载 [英] How do i submit an ajax request before the page is loaded

问题描述

我想通过一个Ajax请求检查用户的登录状态。根据阉的用户登录我要显示任何的用户名/密码输入或用户名。目前的请求被发送上body.onload和一个prgoress指示器示出，直到响应到达。有没有更好的办法？

I want to check the login status of a user through an ajax request. Depending wether the user is logged in I want to display either the username/password input or the username. Currently the request is sent on body.onload and a prgoress indicator is shown until the response arrives. Is there a better way?

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让我们假设该要求规定，应该没有直接的服务器端处理。

Let's assume that the requirements state that there should be no direct server side processing.

推荐答案

如果你不希望依赖于一个工具包，您可以创建自己的domready中函数，看起来有点像这样的：

If you don't want to depend on a toolkit, you can create your own DOMReady function that looks kinda like this:

/* Usage: DOMReady(ajaxFunc); */
function DOMReady(f) {
    if (!document.all) {
        document.addEventListener("DOMContentLoaded", f, false);
    } else {
        if (document.readystate == 'complete') { 
            window.setTimeout(f, 0);
        }
        else {
            //Add event to onload just if all else fails
            attachEvent(window, "load", f);
        }
    }
}

或者一个更复杂的解决方案： http://snipplr.com/view/6029/domreadyjs/

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