来自rvest的html#u表单'；我认不出形式

我正试图通过

rvest

（不是链接的论文/摘要，只是编号、标题、作者等）来获取文章的内容

默认情况下，该页面仅显示2016年论文，删除2016年数据“没有问题”。我希望URL在将“2016”改为“所有年份”后会发生变化，但它仍然是一样的。所以我求助于

html\u表单

。在查看网页的“资源”时，我发现相关的输入名称是

filteryear

R代码：

library(rvest)
rdc <- html_session("https://sfb649.wiwi.hu-berlin.de/fedc/discussionPapers_formular_content.php")
form <- html_form(rdc)
form <- set_values(form, filteryear = "all years")
#Error: Unknown field names: filteryear

---

为什么

html\u表单

不能完全识别此表单？而且，更重要的是，有没有办法解决这个问题？

我可以使用

html\u表单

，但您只需手动

httr:：POST

表单，如下所示：

library(rvest)
library(httr)
res <- POST("https://sfb649.wiwi.hu-berlin.de/fedc/discussionPapers_formular_content.php",
     body = list(filterTypeName = "filterTypeName:AUTHORS",
                 filteryear = "all",
                 B1 = "Search"), encode = "form")
out <- read_html(res) %>% html_table(fill=TRUE)

library(rvest)
library(httr)
res <- POST("https://sfb649.wiwi.hu-berlin.de/fedc/discussionPapers_formular_content.php",
     body = list(filterTypeName = "filterTypeName:AUTHORS",
                 filteryear = "all",
                 B1 = "Search"), encode = "form")
out <- read_html(res) %>% html_table(fill=TRUE)

> dim(out[[7]])
[1] 805  10

> head(out[[7]])

        X1                                                                                     X2
1 2016-049                                                                              Q3-D3-LSA
2 2016-048                                     Unraveling of Cooperation in Dynamic Collaboration
3 2016-047                                                            Time Varying Quantile Lasso
4 2016-046                                                           Credit Rating Score Analysis
5 2016-045                                          Information Acquisition and Liquidity Dry-Ups
6 2016-044 Dynamic Contracting with Long-Term Consequences: Optimal CEO Compensation and Turnover
                                                                  X3  X4         X5                       X6
1                               Lukas Borke and   Wolfgang K. Härdle  B1 15.11.2016        C87,   C88,   G17
2                                                        Suvi Vasama  A8 07.11.2016        C73,   D83,   O31
3      Lenka Zbonakova,  Wolfgang Karl H\177ardle and   Weining Wang  B1 07.11.2016 C21,   G01,   G20,   G32
4 Wolfgang Karl H\177ärdle,  Phoon Kok Fai and   David Lee Kuo Chuen  B1 02.11.2016 C01,   G00,   G17,   G24
5                                 Philipp Koenig and   David Pothier C10 26.10.2016        D82,   G01,   G12
6                                                        Suvi Vasama  A8 26.10.2016        C73,   D82,   D86
  X7 X8 X9 X10
1 NA NA NA  NA
2 NA NA NA  NA
3 NA NA NA  NA
4 NA NA NA  NA
5 NA NA NA  NA
6 NA NA NA  NA