Web将tableauViz拖放到R数据帧中
我花了很多时间寻找这个问题的答案，但还没有找到任何答案。我试图完成的是将包含在tableauViz元素中的Tableau表信息刮取，并将其传播到R数据帧中。在我的第一次尝试中，使用RStudio，我使用了以下代码，并尝试将tableauViz作为HTML读取Web将tableauViz拖放到R数据帧中,r,xml,web-scraping,tableau-api,python,R,Xml,Web Scraping,Tableau Api,Python,我花了很多时间寻找这个问题的答案，但还没有找到任何答案。我试图完成的是将包含在tableauViz元素中的Tableau表信息刮取，并将其传播到R数据帧中。在我的第一次尝试中，使用RStudio，我使用了以下代码，并尝试将tableauViz作为HTML读取 # Load rvest functions library(rvest) # Specifying the url for desired website to be scrapped url <- “https://oir.uga
# Load rvest functions
library(rvest)
# Specifying the url for desired website to be scrapped
url <- “https://oir.uga.edu/factbook/studentinformation/S07StuP58/”
# Reading the HTML code from the website
webpage <- read_html(url)
# Using CSS selectors to scrap the rankings section
rank_data_html <- html_nodes(webpage,'.tableauViz')
如何解决此问题？为了获取数据，您需要tableau URL，在本例中为： 流程如下所示： 调用以下url：
GET https://public.tableau.com/views/S07StuP58/Dashboard1?:embed=y&:showVizHome=no
POST https://public.tableau.com/{vizql_path}/bootstrapSession/sessions/{session_id}
library(rvest)
library(rjson)
library(httr)
library(stringr)
#replace the hostname and the path if necessary
host_url <- "https://public.tableau.com"
path <- "/views/S07StuP58/Dashboard1"
body <- read_html(modify_url(host_url,
path = path,
query = list(":embed" = "y",":showVizHome" = "no")
))
data <- body %>%
html_nodes("textarea#tsConfigContainer") %>%
html_text()
json <- fromJSON(data)
url <- modify_url(host_url, path = paste(json$vizql_root, "/bootstrapSession/sessions/", json$sessionid, sep =""))
resp <- POST(url, body = list(sheet_id = json$sheetId), encode = "form")
data <- content(resp, "text")
extract <- str_match(data, "\\d+;(\\{.*\\})\\d+;(\\{.*\\})")
info <- fromJSON(extract[1,1])
data <- fromJSON(extract[1,3])
worksheets = names(data$secondaryInfo$presModelMap$vizData$presModelHolder$genPresModelMapPresModel$presModelMap)
for(i in 1:length(worksheets)){
print(paste("[",i,"] ",worksheets[i], sep=""))
}
selected <- readline(prompt="select worksheet by index: ");
worksheet <- worksheets[as.integer(selected)]
print(paste("you selected :", worksheet, sep=" "))
columnsData <- data$secondaryInfo$presModelMap$vizData$presModelHolder$genPresModelMapPresModel$presModelMap[[worksheet]]$presModelHolder$genVizDataPresModel$paneColumnsData
i <- 1
result <- list();
for(t in columnsData$vizDataColumns){
if (is.null(t[["fieldCaption"]]) == FALSE) {
paneIndex <- t$paneIndices
columnIndex <- t$columnIndices
if (length(t$paneIndices) > 1){
paneIndex <- t$paneIndices[1]
}
if (length(t$columnIndices) > 1){
columnIndex <- t$columnIndices[1]
}
result[[i]] <- list(
fieldCaption = t[["fieldCaption"]],
valueIndices = columnsData$paneColumnsList[[paneIndex + 1]]$vizPaneColumns[[columnIndex + 1]]$valueIndices,
aliasIndices = columnsData$paneColumnsList[[paneIndex + 1]]$vizPaneColumns[[columnIndex + 1]]$aliasIndices,
dataType = t[["dataType"]],
stringsAsFactors = FALSE
)
i <- i + 1
}
}
dataFull = data$secondaryInfo$presModelMap$dataDictionary$presModelHolder$genDataDictionaryPresModel$dataSegments[["0"]]$dataColumns
cstring <- list();
for(t in dataFull) {
if(t$dataType == "cstring"){
cstring <- t
break
}
}
data_index <- 1
name_index <- 1
frameData <- list()
frameNames <- c()
for(t in dataFull) {
for(index in result) {
if (t$dataType == index["dataType"]){
if (length(index$valueIndices) > 0) {
j <- 1
vector <- character(length(index$valueIndices))
for (it in index$valueIndices){
vector[j] <- t$dataValues[it+1]
j <- j + 1
}
frameData[[data_index]] <- vector
frameNames[[name_index]] <- paste(index$fieldCaption, "value", sep="-")
data_index <- data_index + 1
name_index <- name_index + 1
}
if (length(index$aliasIndices) > 0) {
j <- 1
vector <- character(length(index$aliasIndices))
for (it in index$aliasIndices){
if (it >= 0){
vector[j] <- t$dataValues[it+1]
} else {
vector[j] <- cstring$dataValues[abs(it)]
}
j <- j + 1
}
frameData[[data_index]] <- vector
frameNames[[name_index]] <- paste(index$fieldCaption, "alias", sep="-")
data_index <- data_index + 1
name_index <- name_index + 1
}
}
}
}
df <- NULL
lengthList <- c()
for(i in 1:length(frameNames)){
lengthList[i] <- length(frameData[[i]])
}
max <- max(lengthList)
for(i in 1:length(frameNames)){
if (length(frameData[[i]]) < max){
len <- length(frameData[[i]])
frameData[[i]][(len+1):max]<-""
}
df[frameNames[[i]]] <- frameData[i]
}
options(width = 1200)
df <- as.data.frame(df, stringsAsFactors = FALSE)
print(df)
对于python和R脚本来说，也许这不关我的事，但作者有意将该工作簿发布在Tableau Public上，限制仅允许PDF或PNG下载。您要求我们提供一种方法来规避作者对数据的预期用途。也就是说，您试图完成的工作非常困难，因为Tableau可视化不仅仅是html。AJAX、客户端渲染和SVG的使用非常复杂。您最好联系发布工作簿的人，询问他们是否愿意与您共享数据。
library(rvest)
library(rjson)
library(httr)
library(stringr)
#replace the hostname and the path if necessary
host_url <- "https://public.tableau.com"
path <- "/views/S07StuP58/Dashboard1"
body <- read_html(modify_url(host_url,
path = path,
query = list(":embed" = "y",":showVizHome" = "no")
))
data <- body %>%
html_nodes("textarea#tsConfigContainer") %>%
html_text()
json <- fromJSON(data)
url <- modify_url(host_url, path = paste(json$vizql_root, "/bootstrapSession/sessions/", json$sessionid, sep =""))
resp <- POST(url, body = list(sheet_id = json$sheetId), encode = "form")
data <- content(resp, "text")
extract <- str_match(data, "\\d+;(\\{.*\\})\\d+;(\\{.*\\})")
info <- fromJSON(extract[1,1])
data <- fromJSON(extract[1,3])
worksheets = names(data$secondaryInfo$presModelMap$vizData$presModelHolder$genPresModelMapPresModel$presModelMap)
for(i in 1:length(worksheets)){
print(paste("[",i,"] ",worksheets[i], sep=""))
}
selected <- readline(prompt="select worksheet by index: ");
worksheet <- worksheets[as.integer(selected)]
print(paste("you selected :", worksheet, sep=" "))
columnsData <- data$secondaryInfo$presModelMap$vizData$presModelHolder$genPresModelMapPresModel$presModelMap[[worksheet]]$presModelHolder$genVizDataPresModel$paneColumnsData
i <- 1
result <- list();
for(t in columnsData$vizDataColumns){
if (is.null(t[["fieldCaption"]]) == FALSE) {
paneIndex <- t$paneIndices
columnIndex <- t$columnIndices
if (length(t$paneIndices) > 1){
paneIndex <- t$paneIndices[1]
}
if (length(t$columnIndices) > 1){
columnIndex <- t$columnIndices[1]
}
result[[i]] <- list(
fieldCaption = t[["fieldCaption"]],
valueIndices = columnsData$paneColumnsList[[paneIndex + 1]]$vizPaneColumns[[columnIndex + 1]]$valueIndices,
aliasIndices = columnsData$paneColumnsList[[paneIndex + 1]]$vizPaneColumns[[columnIndex + 1]]$aliasIndices,
dataType = t[["dataType"]],
stringsAsFactors = FALSE
)
i <- i + 1
}
}
dataFull = data$secondaryInfo$presModelMap$dataDictionary$presModelHolder$genDataDictionaryPresModel$dataSegments[["0"]]$dataColumns
cstring <- list();
for(t in dataFull) {
if(t$dataType == "cstring"){
cstring <- t
break
}
}
data_index <- 1
name_index <- 1
frameData <- list()
frameNames <- c()
for(t in dataFull) {
for(index in result) {
if (t$dataType == index["dataType"]){
if (length(index$valueIndices) > 0) {
j <- 1
vector <- character(length(index$valueIndices))
for (it in index$valueIndices){
vector[j] <- t$dataValues[it+1]
j <- j + 1
}
frameData[[data_index]] <- vector
frameNames[[name_index]] <- paste(index$fieldCaption, "value", sep="-")
data_index <- data_index + 1
name_index <- name_index + 1
}
if (length(index$aliasIndices) > 0) {
j <- 1
vector <- character(length(index$aliasIndices))
for (it in index$aliasIndices){
if (it >= 0){
vector[j] <- t$dataValues[it+1]
} else {
vector[j] <- cstring$dataValues[abs(it)]
}
j <- j + 1
}
frameData[[data_index]] <- vector
frameNames[[name_index]] <- paste(index$fieldCaption, "alias", sep="-")
data_index <- data_index + 1
name_index <- name_index + 1
}
}
}
}
df <- NULL
lengthList <- c()
for(i in 1:length(frameNames)){
lengthList[i] <- length(frameData[[i]])
}
max <- max(lengthList)
for(i in 1:length(frameNames)){
if (length(frameData[[i]]) < max){
len <- length(frameData[[i]])
frameData[[i]][(len+1):max]<-""
}
df[frameNames[[i]]] <- frameData[i]
}
options(width = 1200)
df <- as.data.frame(df, stringsAsFactors = FALSE)
print(df)
X.Student.Aid.Program.Type..value X.Student.Aid.Program..value X..Measure.Names..alias X.Multiple.Values..alias
1 Grants/Scholarships Subtotal Graduate Amount Awarded $XXXXXXXX
2 Grants/Scholarships Other (External) Grants/Scholarships Graduate Amount Awarded $XXXXXX
3 Grants/Scholarships Miscellaneous Tuition/Fee Payments/Waivers Graduate Amount Awarded $XXXXXX
4 Grants/Scholarships Graduate Assistantship Tuition Waivers Graduate Amount Awarded $XXXXXX
5 Grants/Scholarships Athletic Scholarships Graduate Amount Awarded $XXXXXX
6 Grants/Scholarships Institutional Grants/Scholarships Graduate Amount Awarded $XXXXXX
7 Grants/Scholarships State (Other) Grants/Scholarships Graduate Amount Awarded $XXXXXX
8 Grants/Scholarships Zell Miller Scholarships Graduate Amount Awarded $XXXXXX
9 Grants/Scholarships HOPE Scholarships Graduate Amount Awarded $XXXXXX
10 Grants/Scholarships Federal (Other) Grants/Scholarships Graduate Amount Awarded
11 Grants/Scholarships Federal Supplemental Grants Graduate Amount Awarded
12 Grants/Scholarships Federal Pell Grants Graduate Amount Awarded
13 Grants/Scholarships Subtotal Graduate Number of Awards XXXXXX
14 Grants/Scholarships Other (External) Grants/Scholarships Graduate Number of Awards XXX