Hm personally I can only give unhelpful help but I can give (1) some general
pointers that have helped me, and (2) a possibly different approach.
What usually works for me when dealing with getting data from the web involves
using the developer tools in a web browser. If you can see what requests your
browser makes, and the server responses you get, you should be able to
reproduce them using the httr package (or rcurl, etc) and parse the response
using rvest.
That all being said, after a quick glance at this page, it looks like several
iframes (web pages within web pages, basically) and a lot of javascript.
Javascript can be tougher to get data out of in a programmatic kind of way,
which leads me to option #2-- are there any other sources of these data that
might be easier to deal with?
It *Looks* like you're trying to get stock price data for IBOVESPA - is this
the same thing as ^BVSP ? if so, have you tried using the quantmod package?
library(quantmod)
getSymbols("^BVSP", src = "yahoo") # this will automatically get the data, and
assign it to a variable called "BVSP"
print(BVSP)
Hopefully that helps some.
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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, September 27, 2020 7:41 AM, Cleber N.Borges via R-SIG-Finance
<r-sig-finance@r-project.org> wrote:
> Hello everyone! Good Morning...
> I would like some tips on how to get data from a web page [1] within R.
> I made a few attempts, but I was unsuccessful because I have little
> knowledge of the http / https protocol.
> If anyone can provide any guidance, I would appreciate it very much.
>
> My difficulty is because this page appears to be a front end that
> outsources to several javascripts to the server that actually deliver
> the data.
>
> Thank you in advance!
>
> Cleber Borges
>
> [1] - https://bbtc.cma.com.br/topchart/?&pagetitle=IBOVESPA
>
> [[alternative HTML version deleted]]
>
> R-SIG-Finance@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-sig-finance
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