LazyWrite (deferred document.write implementation)

LazyWrite is build to have the best compromise between a good page load and write a complex external data in your page (like Advertising). This allow you to control when should those data start to render or load.
Size: less than 3.4KB (2KB gzipped) using UglifyJS.

Advantages

• Increase highly the page load
• Stop freezing client navigator
• Forget iframe calls
• No other library required (like jQuery)
• No(or less) change of existing code

Browser Support:

• IE [tested on v6+]
• FireFox [tested on v2+]
• Chrome [tested on v5+]
• Safari [tested on v4+]
• Opera [tested on v9.6+]

API: ("LazyWrite" global variable)

.write()

• original document.write function.

.prepare()

• Replaces original document.write() with lazy write.
• This function will auto executes when "lazywrite.js" loaded.
• To prevent auto executing, sets AUTO_LAZYWRITE = false; before loads "lazywrite.js".

.render(content String [, holderId String] [, callback(errors Array) Function])

• postpones content rendering in the given holder element or current place (like document.write()).
• An array of all caught exceptions will passes to the callback().

.process()

• Starts to render all contents.
• When all content be rendered, it will restores the original document.write().

.findScripts([String type])

• Finds and stacks all custom typed script elements.

As AMD Module

• No global variable LazyWrite.
• no .prepare() auto executing.

Limitation:

• Can't use document.getElement*() functions to get the writing element in the processing.

Example: Google AdSense

<script src="lazywrite-min.js"></script>
<script>
    google_ad_client = "ca-pub-5840687392233497";
    google_ad_slot = "9902234827";
    google_ad_width = 728;
    google_ad_height = 90;
    document.write('<script src="//pagead2.googlesyndication.com/pagead/show_ads.js"><\/script>');
    setTimeout(LazyWrite.process, 3000); // delay 3sec
</script>