如何从该网页上抓取活动详细信息？
How can I scrape event details from this web page?
任何人都可以帮我抓取 this web page 和 return 上列出的事件的详细信息，并将它们放入数据框中，每个事件一行？
在检查页面源代码以找到我认为正确的 class 属性后，我尝试了以下方法，但它 return 是一个空集。 html_nodes(".event-list-item").
同上
library(rvest)
marches <- read_html("https://map.womensmarch.com/?source=website")
events <- html_nodes(marches, "event-list-item")
我希望输出至少包含日期、地点、标题以及事件是虚拟的还是 in-person。
在这种情况下您不需要抓取数据 - rvest 也不能，因为此数据是在页面加载后通过 javascript 加载的。检查该页面，您可以看到事件信息是 JSON 从另一个站点检索到的，因此可以轻松地直接访问：
library(jsonlite)
feed <- fromJSON("https://zen-hypatia-739ed6.netlify.app/feed")
dat <- feed$events
str(dat)
'data.frame': 313 obs. of 22 variables:
$ id : int 78 404 260 224 286 108 187 265 326 334 ...
$ public_description : chr "Meet up with signs for:\r\nVote Biden, protect rights of people with disabilities, protect Roe VS Wade, prote"| __truncated__ "The womxn of the Oceti Sakowin, the Seven Sacred Council Fires of the Great Sioux Nation are marching to the po"| __truncated__ "As part of Worcester County's regular Blue Honk and Wave sign holding event (every Friday until the election), "| __truncated__ "Standout for Social Justice \r\nWear Mask \r\nMaintain physical distance of at least 6 feet\r\nBring your signs"| __truncated__ ...
$ campaign : chr "oct-17-march" "oct-17-march" "oct-17-march" "oct-17-march" ...
$ lat : num 42.4 44.1 38.3 42.3 40.8 ...
$ lng : num -71.1 -103.2 -75.1 -71.4 -111.9 ...
$ title : chr "Get Up, Stand Up - Stand Up for Your Rights!" "Oceti Sakwin Womxn’s March 2020" "Honor RBG and Stand for Democracy" "Social Justice" ...
$ event_doors_open_at : logi NA NA NA NA NA NA ...
$ venue : chr "Public island at a major 4 way stop. Intersection of North Harvard St and Western Ave Boston MA 02134" "Zoom webinar. https://aclu.zoom.us/j/5351676736 Rapid City SD 57701" "West Ocean City Park and Ride. 12940 Inlet Isle Lane Ocean City MD 21842" "Rt126 x Rt135. Rt126 x Rt135 Framingham MA 01702" ...
$ hasCapacity : int 1 1 1 1 1 1 1 1 1 1 ...
$ city : chr "Boston" "Rapid City" "Ocean City" "Framingham" ...
$ state : chr "MA" "SD" "MD" "MA" ...
$ zip : chr "02134" "57701" "21842" "01702" ...
$ start_datetime : chr "2020-10-16 11:00:00.000000" "2020-10-16 10:00:00.000000" "2020-10-16 15:00:00.000000" "2020-10-16 17:00:00.000000" ...
$ starts_at_utc : chr "2020-10-16 15:00:00.000000" "2020-10-16 16:00:00.000000" "2020-10-16 19:00:00.000000" "2020-10-16 21:00:00.000000" ...
$ end_datetime : logi NA NA NA NA NA NA ...
$ categories : chr "oct-17-march" "oct-17-march" "oct-17-march" "oct-17-march" ...
$ event_is_virtual : int 0 1 0 0 0 0 0 0 0 0 ...
$ is_official : int 0 0 0 0 0 0 0 0 0 0 ...
$ is_team : int 0 0 0 0 0 0 0 0 0 0 ...
$ url : chr "https://act.womensmarch.org/event/oct-17-march/78/" "https://act.womensmarch.org/event/oct-17-march/404/" "https://act.womensmarch.org/event/oct-17-march/260/" "https://act.womensmarch.org/event/oct-17-march/224/" ...
$ start_datetime_formatted: chr "Friday Oct 16 11:00 AM" "Friday Oct 16 10:00 AM" "Friday Oct 16 3:00 PM" "Friday Oct 16 5:00 PM" ...
$ end_datetime_formatted : logi NA NA NA NA NA NA ...
任何人都可以帮我抓取 this web page 和 return 上列出的事件的详细信息，并将它们放入数据框中，每个事件一行？
在检查页面源代码以找到我认为正确的 class 属性后，我尝试了以下方法，但它 return 是一个空集。 html_nodes(".event-list-item").
library(rvest)
marches <- read_html("https://map.womensmarch.com/?source=website")
events <- html_nodes(marches, "event-list-item")
我希望输出至少包含日期、地点、标题以及事件是虚拟的还是 in-person。
在这种情况下您不需要抓取数据 - rvest 也不能，因为此数据是在页面加载后通过 javascript 加载的。检查该页面，您可以看到事件信息是 JSON 从另一个站点检索到的，因此可以轻松地直接访问：
library(jsonlite)
feed <- fromJSON("https://zen-hypatia-739ed6.netlify.app/feed")
dat <- feed$events
str(dat)
'data.frame': 313 obs. of 22 variables:
$ id : int 78 404 260 224 286 108 187 265 326 334 ...
$ public_description : chr "Meet up with signs for:\r\nVote Biden, protect rights of people with disabilities, protect Roe VS Wade, prote"| __truncated__ "The womxn of the Oceti Sakowin, the Seven Sacred Council Fires of the Great Sioux Nation are marching to the po"| __truncated__ "As part of Worcester County's regular Blue Honk and Wave sign holding event (every Friday until the election), "| __truncated__ "Standout for Social Justice \r\nWear Mask \r\nMaintain physical distance of at least 6 feet\r\nBring your signs"| __truncated__ ...
$ campaign : chr "oct-17-march" "oct-17-march" "oct-17-march" "oct-17-march" ...
$ lat : num 42.4 44.1 38.3 42.3 40.8 ...
$ lng : num -71.1 -103.2 -75.1 -71.4 -111.9 ...
$ title : chr "Get Up, Stand Up - Stand Up for Your Rights!" "Oceti Sakwin Womxn’s March 2020" "Honor RBG and Stand for Democracy" "Social Justice" ...
$ event_doors_open_at : logi NA NA NA NA NA NA ...
$ venue : chr "Public island at a major 4 way stop. Intersection of North Harvard St and Western Ave Boston MA 02134" "Zoom webinar. https://aclu.zoom.us/j/5351676736 Rapid City SD 57701" "West Ocean City Park and Ride. 12940 Inlet Isle Lane Ocean City MD 21842" "Rt126 x Rt135. Rt126 x Rt135 Framingham MA 01702" ...
$ hasCapacity : int 1 1 1 1 1 1 1 1 1 1 ...
$ city : chr "Boston" "Rapid City" "Ocean City" "Framingham" ...
$ state : chr "MA" "SD" "MD" "MA" ...
$ zip : chr "02134" "57701" "21842" "01702" ...
$ start_datetime : chr "2020-10-16 11:00:00.000000" "2020-10-16 10:00:00.000000" "2020-10-16 15:00:00.000000" "2020-10-16 17:00:00.000000" ...
$ starts_at_utc : chr "2020-10-16 15:00:00.000000" "2020-10-16 16:00:00.000000" "2020-10-16 19:00:00.000000" "2020-10-16 21:00:00.000000" ...
$ end_datetime : logi NA NA NA NA NA NA ...
$ categories : chr "oct-17-march" "oct-17-march" "oct-17-march" "oct-17-march" ...
$ event_is_virtual : int 0 1 0 0 0 0 0 0 0 0 ...
$ is_official : int 0 0 0 0 0 0 0 0 0 0 ...
$ is_team : int 0 0 0 0 0 0 0 0 0 0 ...
$ url : chr "https://act.womensmarch.org/event/oct-17-march/78/" "https://act.womensmarch.org/event/oct-17-march/404/" "https://act.womensmarch.org/event/oct-17-march/260/" "https://act.womensmarch.org/event/oct-17-march/224/" ...
$ start_datetime_formatted: chr "Friday Oct 16 11:00 AM" "Friday Oct 16 10:00 AM" "Friday Oct 16 3:00 PM" "Friday Oct 16 5:00 PM" ...
$ end_datetime_formatted : logi NA NA NA NA NA NA ...