我正在尝试抓取以下网站的数据框架
http://stats.nba.com/game/0041700404/playbyplay/
我想创建一个表,其中包括比赛日期、整个比赛的得分和球队名称
我使用了以下代码:
game1 <- read_html("http://stats.nba.com/game/0041700404/playbyplay/")
#Extracts the Date
html_nodes(game1, xpath = '//*[contains(concat( " ", @class, " " ), concat( " ", "game-summary-team--vtm", " " ))]//*[contains(concat( " ", @class, " " ), concat( " ", "game-summary-team__lineup", " " ))]')
#Extracts the Score
html_nodes(game1, xpath = '//*[contains(concat( " ", @class, " " ), concat( " ", "status", " " ))]//*[contains(concat( " ", @class, " " ), concat( " ", "score", " " ))]')
#Extracts the Team names
html_nodes(game1, xpath = '//*[contains(concat( " ", @class, " " ), concat( " ", "game-summary-team__name", " " ))]//a')
不幸的是,我得到了以下信息
{xml_nodeset (0)}
{xml_nodeset (0)}
{xml_nodeset (0)}
我已经看到了一堆问题和答案,但似乎没有一个有帮助。
发布于 2018-07-15 04:13:59
不幸的是,rvest不能很好地处理动态创建的JavaScript页面。它在处理静态HTML网页时效果最好。
我建议你看看RSelenium。最后,我使用rsDriver从页面中得到了一些东西
代码示例:
library(RSelenium)
rD <- rsDriver() # runs a chrome browser, wait for necessary files to download
remDr <- rD$client
#no need for remDr$open() browser should already be open
remDr$navigate("http://stats.nba.com/game/0041700404/playbyplay/")
teams <- remDr$findElement(using = "xpath", "//span[@class='team-full']")
teams$getElementText()[[1]]
# and so on...
remDr$close()
# stop the selenium server
rD[["server"]]$stop()
# if user forgets to stop server it will be garbage collected.
rD <- rsDriver()
rm(rD)
gc(rD)
以此类推。
PS:我在使用当前的R* this worked * How to set up rselenium for R?在Windows上安装它时遇到了一些问题
发布于 2018-09-21 15:51:07
我在R中成功地使用了splashr包,要安装你需要docker。下面列出的网站中提到了安装说明
https://cran.r-project.org/web/packages/splashr/vignettes/intro_to_splashr.html
https://docs.docker.com/docker-for-mac/install/#install-and-run-docker-for-mac -如何在mac上安装和运行docker
https://splash.readthedocs.io/en/stable/install.html -在使用启动之前,在终端窗口中键入这些代码
https://stackoverflow.com/questions/51219793
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