无法到达 css 节点 [英] trouble reaching a css node

问题描述

从此页面:http://www.beta.inegi.org.mx/app/buscador/default.html?q=e15a61a

我正在尝试检索此网址:http://www.beta.inegi.org.mx/app/biblioteca/ficha.html?upc=702825720599,

i'm trying to retrieve this url: http://www.beta.inegi.org.mx/app/biblioteca/ficha.html?upc=702825720599,

我尝试通过 css 选择器和 xpath(在 Web 开发人员选项卡中右键单击复制)访问它，但是，我只得到一个 {xml_nodeset (0)]

I've tried to reach it through the css selector and through the xpath (copied with right-click in web developer tab), however, I only get an {xml_nodeset (0)]

library(rvest)
url <- "http://www.beta.inegi.org.mx/app/buscador/default.html?q=e15a62b"
url %>% html_node("#snippet_row-tag_a_0") 
url %>% html_node(xpath='//*[@id="snippet_row-tag_a_0"]')

推荐答案

你想抓取的项目是用 JavaScript 渲染的，你可以改用隐藏的 API:

The items you want to scrape are rendered with JavaScript, you can use the hidden API instead:

试试这个网址:
http://www.beta.inegi.org.mx/app/api/buscador/busquedaTodos/E15A61A_A/RANKING/es

这将返回一个 JSON 字符串，您可以将其解析为 R 中的列表并提取您想要的信息.

This will return you a JSON string, you can parse it into a list in R and extract the information you want.

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