隐藏其内容被代理阻止的iframe [英] Hide the iframes whose content get blocked by proxy

问题描述

我有一个包含iframe的网页。
这些iframe用于显示一些外部网站数据。

I have a webpage with iframes. These iframes are for showing some external website data.

但是当这些外部服务器在网络中被阻止时会出现问题，它会出现代理服务器错误是拒绝连接。
这对我来说不太好看。

But problem arise when those external servers get blocked in a network it gives a error that "The proxy server is refusing connections". It does not look good to me.

我想要隐藏所有这些被阻止的iframe，或者想在那里显示一些备用数据。

I want to hide all these blocked iframes or want to show some alternate data there.

推荐答案

无法检查某个网页是否已加载 。但是，可以使用 onload 事件处理程序。

It's not possible to check whether a page has not loaded. However, it's possible to use onload event handlers.

不依赖于JQuery很重要，因为JQuery也是一个必须加载的外部源。在< script> 标记之后添加此代码最后一个IFRAME元素（通常在正文末尾）。代码：

It's important to not rely on JQuery, because JQuery is also an external source which has to be loaded. Add this code within <script> tags after the last IFRAME element (often, at the end of the body). Code:

//Cannot rely on JQuery, as it has to be loaded
(function(){//Anonymous wrapper.
    var iframes = document.getElementsByTagName("iframe");
    var num_frames = iframes.length;
    //Function to add Event handlers
    var addLoad = window.addEventListener ? function(elem, func){
        elem.addEventListener("load", func, true);
    } : window.attachEvent ? function(elem, func){
        elem.attachEvent("onload", func);
    } : function(elem, func){
        elem.onload = func;
    };
    var success_load = 0;
    for(var i=0; i<num_frames; i++){
        addLoad(iframes[i], function(){
            this.dataSuccessfullyLoaded = true;
            success_load++;
        });
    }
    addLoad(window, function(){
         if(success_load < num_frames){
             for(var i=num_frames-1; i>=0; i--){
                 if(!iframes[i].dataSuccessfullyLoaded){
                     iframes[i].parentNode.removeChild(iframes[i]);
                     //Or: iframes[i].style.display = "none";
                 }
             }
         }
    });
})();

小提琴： http://jsfiddle.net/3vnrg/

编辑

您的代理似乎发送状态代码为200的HTTP页面。另一种选择是包含CSS文件，并检查是否存在CSS变量：

EDIT
Your proxy seems to send HTTP pages with status code 200. Another option is to include the CSS file, and check whether a CSS variable exists or not:

/*From http://static.ak.fbcdn.net/rsrc.php/v1/yb/r/CeiiYqUQjle.css*/
#facebook .hidden_elem{display:none !important}
#facebook .invisible_elem{visibility:hidden}

HTML：

<link rel="Stylesheet" href="http://static.ak.fbcdn.net/rsrc.php/v1/yb/r/CeiiYqUQjle.css" />
<div id="facebook"><div class="hidden_elem invisible_elem"></div></div>

JavaScript（在加载所有资源后执行此代码）：

JavaScript (execute this code after all resources have been loaded):

if($("#facebook div").css("display") != "none" || $("#facebook div").css("visibility") != "hidden") disableFBFrame();
// Where disableFBFrame(); is a function which hides the frame.

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