CasperJS is a headless WebKit framework that uses a convenient asynchronous JavaScript API to capture screenshots, fill out and submit forms, and test web pages. It builds on PhantomJS, a headless WebKit browser with a JavaScript API that provides fast support for DOM handling, CSS selectors, JSON, Canvas, and SVG. CasperJS makes it easier and more powerful to scrape and test web pages than using plain JavaScript alone.

3. Well, CasperJS solves this kind of problem using a convenient API
for dealing with asynchronous stuff:
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API docummentation

5. What is PhantomJS?
PhantomJS is a headless WebKit with a JavaScript API. It has fast and native support
for various web standards: DOM handling, CSS selectors, JSON, Canvas and SVG.

6. Capturing screenshots
Capturing a screenshot of a given area is as easy as this:
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8. Filling and handling forms
Filling and submitting a form is not much harder:
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12. Implementation for digaku2
For all page
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13. Output :

16. Inference
Using casperjs more easy & powerfull than javascript, because casperjs directly call
API of the library
API docummentation
Installation

17. Thank you... :D