Injecting additional javascript libraries into a page with Geb

Once in a while, we might want to add an additional library into an existing page with Geb.

The easy way to do so is to add a helper method called injectLibrary as follows:

def injectLibrary( library ){

     js.exec("document.body.appendChild(document.createElement('script')).src='$library'");

}

Then, whenever you want to add a new library, simply call

injectLibrary( 'http://sinonjs.org/releases/sinon-1.4.2.js' )

This would add the javascript library you have specified in your link into your page.

There are a few scenarios where I have found this to be useful:

• Adding additional libraries in regression tests of your actual site.
• Getting better drag and drop support using Syn.js.
• Injecting Sinon.js to use the fakeTimer functionality when scraping websites.
• Adding jQuery to a page to manipulate document elements to make them easier to find for scraping.

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