library("rvest")
url <- "myurl.com"
tables<- url %>%
read_html() %>%
html_nodes(xpath='//*[@id="pageContainer"]/table[1]') %>%
html_table(fill = T)
tables[[1]]
html內容是這樣的如何使用rvest獲取html_table內的鏈接？細胞
<td><a href="http://somelink.com" target="_blank">Click Here</a></td>
但在刮HTML，如果你想獲得的價值我只得到，
點擊此處
「href」標籤請使用：
//*[@id="pageContainer"]/table[1]//@href
我在http://xpather.com/RtnrY9fh（xpath online）上測試了這個。
您可以通過編輯rvest::html_table和trace來處理此問題。現有行爲
實施例：
library(rvest)
x <- "https://en.wikipedia.org/wiki/Academy_Award_for_Best_Picture" %>%
read_html() %>%
html_nodes("#mw-content-text > table:nth-child(55)")
html_table(x)
#[[1]]
# Film Production company(s) Producer(s)
#1 The Great Ziegfeld Metro-Goldwyn-Mayer Hunt Stromberg
#2 Anthony Adverse Warner Bros. Henry Blanke
#3 Dodsworth Goldwyn, United Artists Samuel Goldwyn and Merritt Hulbert
#4 Libeled Lady Metro-Goldwyn-Mayer Lawrence Weingarten
#5 Mr. Deeds Goes to Town Columbia Frank Capra
#6 Romeo and Juliet Metro-Goldwyn-Mayer Irving Thalberg
#7 San Francisco Metro-Goldwyn-Mayer John Emerson and Bernard H. Hyman
#8 The Story of Louis Pasteur Warner Bros. Henry Blanke
#9 A Tale of Two Cities Metro-Goldwyn-Mayer David O. Selznick
#10 Three Smart Girls Universal Joe Pasternak and Charles R. Rogers
html_table基本上提取的HTML表的單元格，並運行它們html_text。我們所需要做的就是通過從每個單元中提取<a>標籤並替代運行html_attr(., "href")來取代。
trace(rvest:::html_table.xml_node, quote({
values <- lapply(lapply(cells, html_node, "a"), html_attr, name = "href")
values[[1]] <- html_text(cells[[1]])
}), at = 14)
新行爲：
html_table(x)
#Tracing html_table.xml_node(X[[i]], ...) step 14
#[[1]]
# Film Production company(s) Producer(s)
#1 /wiki/The_Great_Ziegfeld NA /wiki/Hunt_Stromberg
#2 /wiki/Anthony_Adverse NA /wiki/Henry_Blanke
#3 /wiki/Dodsworth_(film) NA /wiki/Samuel_Goldwyn
#4 /wiki/Libeled_Lady NA /wiki/Lawrence_Weingarten
#5 /wiki/Mr._Deeds_Goes_to_Town NA /wiki/Frank_Capra
#6 /wiki/Romeo_and_Juliet_(1936_film) NA /wiki/Irving_Thalberg
#7 /wiki/San_Francisco_(1936_film) NA /wiki/John_Emerson_(filmmaker)
#8 /wiki/The_Story_of_Louis_Pasteur NA /wiki/Henry_Blanke
#9 /wiki/A_Tale_of_Two_Cities_(1935_film) NA /wiki/David_O._Selznick
#10 /wiki/Three_Smart_Girls NA /wiki/Joe_Pasternak
你會得到滿意的所有單個細胞的HREFs？或者你是否特別想要一個data.frame格式的hrefs？因爲它應該很容易收集href屬性：'％>％html_nodes（「適當的xpath或選擇器」）％>％html_attr（「href」）;' – Chrisss
'XML :: getHTMLLinks（url，xpQuery =「//* [@ id =「pageContainer」]/table [1] // @ href「）'應該是你所需要的 –