Description
I've been trying to log in to https://openreview.net/ using rvest, following instructions at https://riptutorial.com/r/example/23955/using-rvest-when-login-is-required and https://stackoverflow.com/questions/54132813/rvest-how-to-submit-form-when-input-doesnt-have-a-name
library(rvest)
# Address of the login webpage
login <- "https://openreview.net/login"
# Create a web session with the desired login address
pgsession <- html_session(login)
pgform <- html_form(pgsession)[[2]] #in this case the submit is the 2nd form
pgform$fields[[1]]$value <- "****" # replace by email
pgform$fields[[2]]$value <- "***" # replace by password
submit_form(pgsession, pgform)which results in
Submitting with '<unnamed>'
Error in parse_url(url) : length(url) == 1 is not TRUE
Reading the submit_form function, I noticed that it builds a URL as follows
url <- xml2::url_absolute(form$url, session$url)
Checking the form, I noticed that form$url is NULL, which results in url being NULL, explaining the message length(url) == 1 is not TRUE.
I've tried fiddling with the rvest source code, e.g. editing lines to say
form_url <- ifelse(!is.null(form$url), "/", form$url)
url <- xml2::url_absolute(form_url, session$url)
but the reprex above then produces
Submitting with '<unnamed>'
Error in ans[npos] <- rep(no, length.out = len)[npos] :
replacement has length zero
In addition: Warning message:
In rep(no, length.out = len) : 'x' is NULL so the result will be NULL
I'm all out of ideas, whether the form doesn't respect standards that rvest expects, or rvest needs some further tweaks to support whatever this form expects./returns.
Thanks in advance for the advice!