r - R: Rvest - got hidden text i don't want

Question

I'm doing webscraping to this web:

http://www.falabella.com.pe/falabella-pe/category/cat40536/Climatizacion?navAction=push

I just need the information from the products: "brand", "name of product", "price".

I can get that, but also i get the information from a banner with similar products by other users. I don't need it.

But when i go to the source code of the page, i can't see those products. I think it's been pulled through javascript or something:

QUESTION 1: How to block this information when doing the web scraping? This adds products that i don't need. But can't see this part in the source code.

QUESTION 2: When extracting prices "precio1", i get this as first element: "\n\t\t\t\tSubtotal InternetS/. 0" I can't see that in the code source neither. How to not scrape it?

library(RSelenium)
library(rvest)
#start RSelenium
checkForServer()
startServer()
remDr <- remoteDriver()
remDr$open()

#navigate to your page
remDr$navigate("http://www.falabella.com.pe/falabella-pe/category/cat40536/Climatizacion?navAction=push")


page_source<-remDr$getPageSource()


Climatizacion_marcas1 <- html(page_source[[1]])%>%
        html_nodes(".marca") %>%
        html_nodes("a") %>%
        html_attr("title")


Climatizacion_producto1 <- html(page_source[[1]])%>%
        html_nodes(".detalle") %>%
        html_nodes("a") %>%
        html_attr("title")


Climatizacion_precio1 <- html(page_source[[1]])%>%
        html_nodes(".precio1") %>%
        html_text()

Answer 1

保持接近您的方法，这将做到：

library(rvest)
u <- "http://www.falabella.com.pe/falabella-pe/category/cat40536/Climatizacion?navAction=push"
doc <- html(u)

Climatizacion_marcas1 <- doc %>% 
  html_nodes(".marca")[[1]] %>%
  html_nodes("a") %>%
  html_attr("title")

Climatizacion_producto1 <- doc %>% 
  html_nodes(".detalle") %>%
  html_nodes("a") %>%
  html_attr("title")

“\n\t\t”等来自对html的解析。显然，那里有回车和制表符。一个简单的解决方案是：

Climatizacion_precio1 <- doc %>% 
  html_node(".precio1") %>%
  html_text() %>% 
  stringr::str_extract_all("[:number:]{1,4}[.][:number:]{1,2}", simplify = TRUE) %>% 
  as.numeric

Climatizacion_precio1
[1] 44.9

实际上，这会从字符串中选择数字（因此也会删除“S/.”。如果您希望“S/.”保留，您可以执行以下操作：

Climatizacion_precio1 <- doc %>% 
  html_node(".precio1") %>%
  html_text() %>% 
  gsub('[\r\n\t]', '', .)

Climatizacion_precio1
[1] "S/. 44.90"

编辑 这是另一种方法，使用XMLand selectr。这将一次性获取页面上所有项目的信息。

library(XML)

clean_up <- function(x) {
  stringr::str_replace_all(x, "[\r\t\n]", "")
}

product <- selectr::querySelectorAll(doc, ".marca") %>% 
  xmlApply(xmlValue) %>% lapply(clean_up) %>% unlist

details <-   selectr::querySelectorAll(doc, ".detalle a") %>% 
  xmlApply(xmlValue) %>% 
  unlist

price <- selectr::querySelectorAll(doc, ".precio1") %>% 
  xmlApply(xmlValue) %>% lapply(clean_up) %>% unlist

as.data.frame(cbind(product, details, price))
      product                  details      price
1       Imaco  Termoventilador NF15...  S/. 44.90
2       Imaco  Ventilador de 10"  I...     S/. 69
3       Imaco  Ventilador Imaco de ...     S/. 89
4      Taurus  Recirculador TRA-30 ...     S/. 89
5       Imaco  Termoventilador ITC-...    S/. 109
6        Sole Termo Ventilador Elé...     S/. 99
7      Taurus  Ventilador TVP-40 3 ...     S/. 99
8       Imaco  Estufa OFR7AO 1.500 ...    S/. 129
9      Alfano  Ventilador Recircula...    S/. 139
10     Taurus  Ventilador TVC-40RC ...    S/. 139
11      Imaco  Ventilador Pedestal ...    S/. 149
12     Alfano  Ventilador Orbital 1...    S/. 149
13 Electrolux  Ventilador  de Mesa ... S/. 149.90
14     Alfano  Estufa Termoradiador...    S/. 159
15     Alfano  Ventilador Pared 18"...    S/. 169
16      Imaco     Termoradiador OFR9AO    S/. 179

您通常可能希望对结果进行一些初步清理。