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**Category:** Ruby\
**Created:** [April 11, 2009, 7:09am UTC](https://www.ruby-forum.com/t/scrape-data-from-javascript-inside-html-source/165277 "2009-04-11T07:09:28Z")\
**Posts on this page:** 2\
**Page:** 1
**Author:**  [@yaxm](https://www.ruby-forum.com/u/yaxm)\
**Post date:** [April 11, 2009, 7:09am UTC](https://www.ruby-forum.com/t/scrape-data-from-javascript-inside-html-source/165277/1 "2009-04-11T07:09:28Z")
Hi,
is there any scraper that interact with Javascript function inside a
HTML page? Sometimes, the data is returned from a Javascript function
or a javascript variable. so I wonder if there’s a easy way to get data
out by evaluating and evaluating the javascript based on the context of
the page in Ruby?
Yaxm
---
**Author:**  [@yaxm](https://www.ruby-forum.com/u/yaxm)\
**Post date:** [April 11, 2009, 7:20am UTC](https://www.ruby-forum.com/t/scrape-data-from-javascript-inside-html-source/165277/2 "2009-04-11T07:20:39Z")
Yaxm Y. wrote:
> is there any scraper that interact with Javascript function inside a
> HTML page? Sometimes, the data is returned from a Javascript function
> or a javascript variable. so I wonder if there’s a easy way to get data
> out by evaluating and evaluating the javascript based on the context of
> the page in Ruby?
In test? Or “scraping” a target website to see what it’s got?
Either way, I would use Nokogiri to rip the HTML and find tags,
then
use racc and rkelly to interpret the JavaScript and find its variables.
By “would” I mean I already _do_ that. Here’s the rkelly calls required:
```
RKelly.parse(js).pointcut('TargetMethod()'). # with the ()
matches.each do |updater|
updater.grep(RKelly::Nodes::ArgumentsNode).each do |thang|
p thang
end
end
```
However, if you are attacking other peoples’ websites to scrape out
their data,
you might instead try Watir. It just runs a web browser and evaluates
its JS
directly.