提问人:ronzenith 提问时间:10/1/2021 更新时间:10/3/2021 访问量:121
将在线 xml 数据加载到 R 闪亮仪表板中的滑块
Loading online xml data to slider in R shiny dashboard
问:
我和我的朋友使用下载的数据构建了一个 R 闪亮的仪表板。代码如下:
library(shiny)
library(shinydashboard)
library(dplyr)
library(tidyverse)
library(reshape)
library(scales)
ecd <- read.csv("ecd-figures.csv")
c(
"No of case" = "no_of_case",
"Minor Case" = "minor_case",
"All Non Fatal Case" = "all_non_fatal_case",
"Fatal Case" = "fatal_case"
) -> vec
ui <- fluidPage(sidebarLayout(
sidebarPanel
(
checkboxGroupInput("feature",
"Feature",
vec),
sliderInput(
"year",
"Year",
min = min(ecd$year),
max = max(ecd$year),
value = range(ecd$year),
sep = "",
step = 1
)
),
mainPanel(tabsetPanel(
tabPanel("Plot", plotOutput("correlation_plot")),
tabPanel("Table", tableOutput("ecd"))
))
))
server <- function(input, output) {
yearrange <- reactive({
ecd %>%
subset(year %in% input$year[1]:input$year[2]) %>%
select(c(year, input$feature))
})
output$correlation_plot <- renderPlot({
ecdsubset <- yearrange()
ecdsubset <- melt(ecdsubset, id = "year")
validate(need(input$feature, 'Check at least one item.'))
ggplot(ecdsubset, aes(x = year, y = value, color = variable)) + geom_line(size = 1) + scale_x_continuous(breaks =
seq(input$year[1], input$year[2], by = 1))
})
output$ecd <- renderTable({
yearrange()
})
}
shinyApp(ui, server)
简单的数据文件在这里:https://drive.google.com/file/d/1pZQe89wxw14lirW2mRIgi9h29yPyc7Fs/view?usp=sharing
然后,我想让一切都在线,即调用 api 而不是下载 csv 文件。似乎可以相当简单地阅读内容,如下所示:
library(xml2)
ecd_xml <-"https://www.labour.gov.hk/datagovhk/resource/ecd/ecd-figures.xml"
read_ecd <- read_xml(ecd_xml)
xml_find_all(read_ecd, ".//year")
{xml_nodeset (5)}
[1] <year>2015</year>
[2] <year>2016</year>
[3] <year>2017</year>
[4] <year>2018</year>
[5] <year>2019</year>
问题是:如何将 xml 内容中的每一条信息解析到仪表板上?
以滑块为例。如何通过解析标签并选择最大值和最小值来显示滑块标签(即 2015 和 2019)?<year>
而且,您能为我推荐一些阅读材料来学习从 xml 到仪表板的整个过程吗?非常感谢提前。
(附言我尝试使用包来代替,因为有一些标准参数可以查找属性的最大值、最小值和平均值。但是我遇到了另一个大错误——xml
Error in function (type, msg, asError = TRUE) :
error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version
我该怎么办?我的 R 版本是 4.0.5 (2021-03-31)。
答:
1赞
danlooo
10/1/2021
#1
您可以使用从 XML 树创建 tibble。
此外,您可以使用更新 UI 滑块范围:xml2::as_list
shiny::updateSliderInput
library(shiny)
library(shinydashboard)
library(dplyr)
library(tidyverse)
library(reshape)
library(scales)
library(xml2)
vec <- c(
"No of case" = "no_of_case",
"Minor Case" = "minor_case",
"All Non Fatal Case" = "all_non_fatal_case",
"Fatal Case" = "fatal_case"
)
ui <- fluidPage(sidebarLayout(
sidebarPanel(
checkboxGroupInput(
"feature",
"Feature",
vec
),
sliderInput(
"year",
"Year",
min = 2000,
max = 2001,
value = c(2000, 2001),
sep = "",
step = 1
)
),
mainPanel(tabsetPanel(
tabPanel("Plot", plotOutput("correlation_plot")),
tabPanel("Table", tableOutput("table"))
))
))
server <- function(input, output, session) {
xml <-
"https://www.labour.gov.hk/datagovhk/resource/ecd/ecd-figures.xml" %>%
read_xml()
table <-
xml %>%
xml_find_all(".//item") %>%
map(as_list) %>%
map(~ .x %>% as_tibble()) %>%
bind_rows() %>%
unnest(everything()) %>%
type_convert()
years <- table$year %>% unique()
updateSliderInput(
session = session,
inputId = "year",
min = min(years),
max = max(years),
value = c(min(years), max(years)) # current selected range
)
sub_table <- reactive({
table %>%
filter(year %in% input$year[1]:input$year[2]) %>%
select(c(year, input$feature))
})
output$correlation_plot <- renderPlot({
validate(need(input$feature, "Check at least one item."))
sub_table() %>%
pivot_longer(-year) %>%
ggplot(aes(x = year, y = value, color = name)) +
geom_line(size = 1) +
scale_x_continuous(
breaks = seq(input$year[1], input$year[2], by = 1)
)
})
output$table <- renderTable({
sub_table()
})
}
shinyApp(ui, server)
评论
0赞
ronzenith
10/1/2021
谢谢。让我试试。我应该将所有标签更改为 ,例如 --> 和 into 吗?ecd
xml_years
tabPanel("Table", tableOutput("ecd"))
tabPanel("Table", tableOutput("xml_years"))
yearrange <- reactive({ ecd %>%
yearrange <- reactive({ xml_years %>%
0赞
danlooo
10/1/2021
不。任何以 结尾的函数的第一个参数是 which 不得链接到类型不同的对象(此处:数值向量)。我用它作为前缀,以免将其与 混淆。我建议重命名为 并重命名为 .然后你就不再需要副本了。Output
outputId
character
xml_
yearrange
xml_years
ecd_years
yearrange
ecd_subset
ecdsubset
0赞
ronzenith
10/1/2021
明白了。但是,如果我想不再依赖 ecd(即 csv),似乎应该替换所有 ecd$ 和 ecd%>%。
0赞
danlooo
10/1/2021
@ronzenith我修改了我的答案以使其取决于 csv 文件
1赞
danlooo
10/3/2021
是的。 将一列映射到一种美学,如 x、y、颜色等。您希望按变量名称着色。变量名称位于多列中,因此您必须从宽格式到长格式。然后我们有一个名为它的列,我们可以将其映射到颜色。ggplot
sub_table
name
评论