rvest how to select a specific css node by id
You can use xpath:
require(rvest)text <- '<div class="style"> <input id="a" value="123"> <input id="b"></div>'h <- read_html(text)h %>% html_nodes(xpath = '//*[@id="a"]') %>% xml_attr("value")The easiest way to get css- and xpath-selector is to use http://selectorgadget.com/.For a specific attribute like yours use chrome's developer toolbar to get the xpath as follows:
This will work just fine with straight CSS selectors:
library(rvest)doc <- '<div class="style"> <input id="a" value="123"> <input id="b"></div>'pg <- html(doc)html_attr(html_nodes(pg, "div > input:first-of-type"), "value")## [1] "123"
Adding an answer bc I don't see the easy css selector shorthand for selecting by id: using #your_id_name:
h %>% html_node('#a') %>% html_attr('value')which outputs "123" as desired.
Same setup as the others:
require(rvest)text <- '<div class="style"> <input id="a" value="123"> <input id="b"></div>'h <- read_html(text)