我认为使用rvest可能会比较棘手，因为按钮引用了一个javascript脚本。

# load libraries
library(RSelenium)

# define url ---------------------------------------------------------
url <- "https://ipindiaonline.gov.in/tmrpublicsearch/frmmain.aspx"

# define search terms ------------------------------
word_mark <- "Bull"
class_search_term <- "32"

# start RSelenium ------------------------------------------------------------

rD <- rsDriver(browser="firefox", port=4548L, chromever = NULL)
remDr <- rD[["client"]]

# Navigate to webpage -----------------------------------------------------
remDr$navigate(url)

# fill in the form ------------------------------------------------
# this finds the html element for each part of the form
# and fills it in with the value we want

# Wordmark
remDr$findElement(using = "id", value = "ContentPlaceHolder1_TBWordmark")$sendKeysToElement(list(word_mark))

# Class
remDr$findElement(using = "id", value = "ContentPlaceHolder1_TBClass")$sendKeysToElement(list(class_search_term))

# click submit button ---------------------------------------

remDr$findElements("id", "ContentPlaceHolder1_BtnSearch")[[1]]$clickElement()

下面是指向的页面的样子：

进入此页面后，您可以使用rvest获取更多详细信息链接列表

library(rvest)
library(magrittr)

# pull html from page
html <- remDr$getPageSource()[[1]]

# find all the html elements with the .LnkshowDetails class

more_details_butons <- html %>% read_html() %>% 
  html_nodes(".LnkshowDetails") %>%
  html_attr("id")

然后你可以循环通过所有的按钮并点击它们或拉取数据