Question

我很擅长R的rvest库来抓取网站，但我正在努力寻找新的东西。从这个网页 - http://www.naia.org/ViewArticle.dbml?ATCLID=205323044 - 我试图抓住大学的主要表格。

以下是我的代码目前的样子：

NAIA_url = "http://www.naia.org/ViewArticle.dbml?ATCLID=205323044"
NAIA_page = read_html(NAIA_url)

tables = html_table(html_nodes(NAIA_page, 'table'))
# tables returns a length-2 list, however neither of these tables are the table I desire.

# grab the correct iframe node
iframe = html_nodes(NAIA_page, "iframe")[3]

然而，我正在努力克服这个问题。（1）由于某种原因，调用html_nodes并没有抓住我想要的表。（2）我不确定是否应该抓住iframe，然后尝试从内部抓住桌子。

任何帮助表示赞赏！

Answer 1

如果嵌入的iframe是html，您可以抓取iframe来源并从那里获取所需的表格。

library(rvest)
#> Loading required package: xml2
library(magrittr)
"http://www.naia.org/ViewArticle.dbml?ATCLID=205323044" %>%
  read_html() %>%
  html_nodes("iframe") %>%
  extract(3) %>% 
  html_attr("src") %>% 
  read_html() %>% 
  html_node("#searchResultsTable") %>% 
  html_table() %>%
  head()
#>                                   College or University       City, State
#> 1                   Central Christian College ATHLETICS     McPherson, KS
#> 2 +                   Crowley's Ridge College ATHLETICS     Paragould, AR
#> 3                       Edward Waters College ATHLETICS  Jacksonville, Fl
#> 4                 Fisher College ADMISSIONS | ATHLETICS        Boston, MA
#> 5       Georgia Gwinnett College ADMISSIONS | ATHLETICS Lawrenceville, GA
#> 6   Lincoln Christian University ADMISSIONS | ATHLETICS       Lincoln, IL
#>   Conference Enrollment
#> 1     A.I.I.        259
#> 2     A.I.I.          0
#> 3     A.I.I.        805
#> 4     A.I.I.        600
#> 5     A.I.I.      9,720
#> 6     A.I.I.      1,060

使用R rvest库在iframe中搜索表

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