Get element attributes

Source: R/html.R

html_attr() gets a single attribute; html_attr() gets all attributes.

html_attr(x, name, default = NA_character_)

html_attrs(x)

Arguments

x

A document (from read_html()), node set (from html_elements()), node (from html_element()), or session (from session()).
name

Name of attribute to retrieve.
default

A string used as a default value when the attribute does not exist in every element.

Value

A character vector (for html_attr()) or list (html_attrs()) the same length as x.

Examples

url <- "https://en.wikipedia.org/w/index.php?title=The_Lego_Movie&oldid=998422565"
html <- read_html(url)

cast <- html_elements(html, "tr:nth-child(8) .plainlist a")
cast %>% html_text2()

#> [1] "Chris Pratt"     "Will Ferrell"    "Elizabeth Banks" "Will Arnett"    
#> [5] "Nick Offerman"   "Alison Brie"     "Charlie Day"     "Liam Neeson"    
#> [9] "Morgan Freeman" 
cast %>% html_attrs()

#> [[1]]
#>                href               title 
#> "/wiki/Chris_Pratt"       "Chris Pratt" 
#> 
#> [[2]]
#>                 href                title 
#> "/wiki/Will_Ferrell"       "Will Ferrell" 
#> 
#> [[3]]
#>                    href                   title 
#> "/wiki/Elizabeth_Banks"       "Elizabeth Banks" 
#> 
#> [[4]]
#>                href               title 
#> "/wiki/Will_Arnett"       "Will Arnett" 
#> 
#> [[5]]
#>                  href                 title 
#> "/wiki/Nick_Offerman"       "Nick Offerman" 
#> 
#> [[6]]
#>                href               title 
#> "/wiki/Alison_Brie"       "Alison Brie" 
#> 
#> [[7]]
#>                href               title 
#> "/wiki/Charlie_Day"       "Charlie Day" 
#> 
#> [[8]]
#>                href               title 
#> "/wiki/Liam_Neeson"       "Liam Neeson" 
#> 
#> [[9]]
#>                   href                  title 
#> "/wiki/Morgan_Freeman"       "Morgan Freeman" 
#> 
cast %>% html_attr("href")

#> [1] "/wiki/Chris_Pratt"     "/wiki/Will_Ferrell"    "/wiki/Elizabeth_Banks"
#> [4] "/wiki/Will_Arnett"     "/wiki/Nick_Offerman"   "/wiki/Alison_Brie"    
#> [7] "/wiki/Charlie_Day"     "/wiki/Liam_Neeson"     "/wiki/Morgan_Freeman" 

# If needed, use url_absolute() to convert to complete urls
url_absolute(html_attr(cast, "href"), url)

#> [1] "https://en.wikipedia.org/wiki/Chris_Pratt"    
#> [2] "https://en.wikipedia.org/wiki/Will_Ferrell"   
#> [3] "https://en.wikipedia.org/wiki/Elizabeth_Banks"
#> [4] "https://en.wikipedia.org/wiki/Will_Arnett"    
#> [5] "https://en.wikipedia.org/wiki/Nick_Offerman"  
#> [6] "https://en.wikipedia.org/wiki/Alison_Brie"    
#> [7] "https://en.wikipedia.org/wiki/Charlie_Day"    
#> [8] "https://en.wikipedia.org/wiki/Liam_Neeson"    
#> [9] "https://en.wikipedia.org/wiki/Morgan_Freeman"