如何检测网页何时加载？ [英] How do I detect when a web page is loaded?

问题描述

我想编写一个应用程序来检测浏览器何时加载页面，然后我应该能够在加载的网页上插入内容？任何人有想法如何做到这一点？

请注意，我应该能够在任何浏览器（Firefox / IE）中执行此操作。

我应该用什么语言来帮助我做到这一点？

如何从外部应用程序中检测到这一点？

我应该如何将它与浏览器整合？

您会使用javascript来做这个。如果你不知道如何使用javascript，我会建议阅读一些 教程 来检测页面何时加载。您可以使用 window.onload 事件。

  window.onload = function（）{
 addPageContents（ ）; //示例函数调用。 
 
 $ / code> 

编辑：如果你想添加多个onload函数，而不是使用一个JavaScript库，你可以打包自己的onload hanlder。

  window.whenloaded = function（fn）{
 if （window.onload）{
 var old = window.onload; 
 window.onload = function（）{
 old（）; 
 fn（）; 
} 
} else {
 window.onload = fn; 
} 
} 
  




I want to write an application that detects when a page is loaded in the browser, then I should be able to insert content on top of the loaded web page? Anybody with an idea on how to do that?

Please note that I should be able to do this in any browser (Firefox/IE).

What language should I use to help me do this?

How do I detect this from an external application?

How should I integrate this with the browser?

解决方案

You would use javascript to do this. If you don't know how to use javascript, I would recommend reading through some tutorials first.

After you have a basic understanding of javascript, you can detect when a page has loaded by using the window.onload event.

window.onload = function() {
  addPageContents();  //example function call.
}

Edit: If you want to add more than one onload function, and not use a javascript library, you can wrap your own onload hanlder.

window.whenloaded = function(fn) {
  if (window.onload) {
    var old = window.onload;
    window.onload = function() {
      old();
      fn();
    }
  } else {
    window.onload = fn;
  }
}

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