crapLoader.js - Loads (Almost) Any Third-Party Script With document.write Asynchronously

crapLoader.js is a JavaScript library to load ads, widgets or any JavaScript code with document.write in it. The recommended solution is to use iframes for third-party content, but this is not always possible. Normally document.write prevents you from loading a script asynchronously, but this library hijacks document.write and delegates the content loaded from each script into the correct position.

Features

• Load (almost) any third-party script asynchronously
• Does not block rendering of your page
• Your visitors see your content earlier
• DOMContentLoaded (a.k.a. $(doc).ready ) and window.onload triggered earlier
• Load the banners in parallel! Except in IE ;(
• Banners loads faster (at least in theory)
• Handles recursive scripts
• Inline and external javascript
• Inline and external vbscript
• Buffer document.write, flush on script load event
• Handles document.getElementById from the buffer
• Tested (manually) in IE 6-10, latest Firefox, Chrome, Safari, Opera

Disadvantages

• You never know for sure that all ads will load correctly
• Ads might circumvent by getting a clean doc.write from an iframe
• Possible to stop, but won't
• Using this script might violate the terms of your ad provider
• You can't use document.write in your own scripts, but why would you?!?
• document.getElementById will be a tad slower until all scripts loaded with crapLoader are finished loading

Requirements: None
Demo: https://github.com/gregersrygg/crapLoader
License: MIT License

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