Rvest not recognizing css selector

Question

I\'m trying to scrape this website:

http://www.racingpost.com/greyhounds/result_home.sd#resultDay=2015-12-26&meetingId=18&isFullMeeting=true

through

Answer 1

It's making an XHR request to generate the HTML. Try this (which should also make it easier to automate the data capture):

library(httr)
library(xml2)
library(rvest)

res <- GET("http://www.racingpost.com/greyhounds/result_by_meeting_full.sd",
           query=list(r_date="2015-12-26",
                      meeting_id=18))

doc <- read_html(content(res, as="text"))

html_nodes(doc, ".black")
## {xml_nodeset (56)}
##  [1] A9
##  [2] £61
##  [3] 470m
##  [4] -30
##  [5] H2
##  [6] £105
##  [7] 470m
##  [8] -30
##  [9] A7
## [10] £61
## [11] 470m
## [12] -30
## [13] A5
## [14] £66
## [15] 470m
## [16] -30
## [17] A8
## [18] £61
## [19] 470m
## [20] -20
## ...