Taking screenshots of webpages using Ruby


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Recently we have been working on taking screenshots for web page while generating reports based on that website. During this endeavor, we came across some tools to achieve that. We are sharing the information we gathered here.

The tools that we will discuss for screencapture, in  Ruby,  are:

  • PhantomJS
  • Screencap gem
  • Webshot gem

Screencap and webshot are gems in Ruby that depends on a tool called PhantomJS. It is basically a web browser without a user interface, primarily used for testing websites. Such type of browsers are generally referred to as headless browsers,

Screenshots with PhantomJS

PhantomJS is quite easy to install and is multiplatform, available on major operating systems.

To start, our script must require a reference to the webpage module then use it to create an instance:

Use the instance.open() method and pass it the arguments, the url of the webpage that we want to capture screenshot.

instance.render() method captures the screenshot and saves it to the file specified in the argument.
Run the script as,

Screenshot is saved in the  directory where we run the script.

Now what we have above is all JavaScript, but to use the phantom JS in our rails application we have gems that provide us with an easy interface to acheive the …

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