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我想使用 rvest 从网上下载论文的所有链接/标题。我使用了以下脚本,但它不是列表为零。有什么建议么?

图书馆(rvest)

1. 下载 HTML 并使用 read_html() 将其转换为 XML 文件

论文 <- read_html(" https://papers.ssrn.com/sol3/JELJOUR_Results.cfm?npage=1&form_name=journalBrowse&journal_id=1475407&Network=no&lim=false ")

2. 使用 html_nodes() 提取特定节点

标题 <- html_nodes(论文,“span.optClickTitle”)

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你很接近,尝试.optClickTitle而不是span.optClickTitle

library(magrittr)
library(tibble)
library(rvest)
#> Lade nötiges Paket: xml2

url <- "https://papers.ssrn.com/sol3/JELJOUR_Results.cfm?npage=1&form_name=journalBrowse&journal_id=1475407&Network=no&lim=false"
raw <- read_html(url)

parse_link <- function(x) {
  tibble(title = html_text(x),
         link = html_attr(x = x, name = "href"))
}

raw %>%
  html_nodes(".optClickTitle") %>%
  parse_link()
#> # A tibble: 60 x 2
#>    title                                            link                  
#>    <chr>                                            <chr>                 
#>  1 The Nature of Man                                https://ssrn.com/abst…
#>  2 The Dynamics of Crowdfunding: An Exploratory St… https://ssrn.com/abst…
#>  3 Some Simple Economics of the Blockchain          https://ssrn.com/abst…
#>  4 "Some Simple Economics of the Blockchain\r\n\t\… https://ssrn.com/abst…
#>  5 "Some Simple Economics of the Blockchain\r\n\t\… https://ssrn.com/abst…
#>  6 Bitcoin: An Innovative Alternative Digital Curr… https://ssrn.com/abst…
#>  7 Piracy and Box Office Movie Revenues: Evidence … https://ssrn.com/abst…
#>  8 The sharing economy: Why people participate in … https://ssrn.com/abst…
#>  9 Consumer Acceptance and Use of Information Tech… https://ssrn.com/abst…
#> 10 What Makes Online Content Viral?                 https://ssrn.com/abst…
#> # ... with 50 more rows

reprex 包(v0.2.1)于 2018 年 9 月 28 日创建

于 2018-09-28T17:58:52.557 回答