Created
July 26, 2017 17:04
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library(shiny) | |
library(shiny.collections) | |
library(rhandsontable) | |
library(purrr) | |
ui = shinyUI(fluidPage( | |
titlePanel("Handsontable"), | |
mainPanel( | |
rHandsontableOutput("hot") | |
) | |
)) | |
connection <- shiny.collections::connect() | |
server = function(input, output) { | |
# We create collection object, where mydata$collection is reactive value. | |
mydata <- shiny.collections::collection("mydata", connection) | |
column_names <- c("a", "b", "c") | |
isolate({ | |
# If we run the app for the first time, we should fill our DB in | |
# with some content. | |
if(is_empty(mydata$collection)) { | |
shiny.collections::insert(mydata, | |
list(a = 1, b="a", c = TRUE)) | |
shiny.collections::insert(mydata, | |
list(a = 3.14, b="xx", c = TRUE)) | |
shiny.collections::insert(mydata, | |
list(a = 100, b="some text", c = FALSE)) | |
} | |
}) | |
# Reactive which gives list with changes. | |
change_list <- reactive({ | |
changes <- NULL | |
if(!is.null(input$hot$changes$changes)) { | |
changes <- input$hot$changes$changes %>% | |
map(function (change) { | |
# +1 is needed as JS and R indexing differs. | |
row <- change[[1]] + 1 | |
col <- change[[2]] + 1 | |
new_value <- change[[4]] | |
list(row = row, col = col, val = new_value) | |
}) | |
} | |
changes[[1]] | |
}) | |
# Here we observe for a change and update mydata using shiny.collections | |
# insert function. | |
observe({ | |
if (!is.null(change_list()$val)) { | |
change_row <- as.list(mydata$collection[change_list()$row, ]) | |
change_col <- names(mydata$collection)[[change_list()$col]] | |
change_row[[change_col]] <- change_list()$val | |
shiny.collections::insert(mydata, | |
change_row, | |
conflict = "update") | |
} | |
}) | |
output$hot <- renderRHandsontable({ | |
rhandsontable(mydata$collection[column_names], useTypes = TRUE) %>% | |
hot_table(readOnly = FALSE) | |
}) | |
} | |
shinyApp(ui = ui, server = server) |
@filipstachura
Thx a lot for this example, though when I change the column names (in a way that they are not alphabetically sorted (see below), you example throughs an error. Error in bind_rows_: Column
a can't be converted from logical to numeric
How to make the example code more robust?
Note I also want to keep the column sequence c, b, a in the handsontable.
library(shiny)
library(shiny.collections)
library(rhandsontable)
library(purrr)
ui = shinyUI(fluidPage(
titlePanel("Handsontable"),
mainPanel(
rHandsontableOutput("hot")
)
))
connection <- shiny.collections::connect()
server = function(input, output) {
# We create collection object, where mydata$collection is reactive value.
mydata <- shiny.collections::collection("mydata", connection)
column_names <- c("c", "b", "a")
isolate({
# If we run the app for the first time, we should fill our DB in
# with some content.
if(is_empty(mydata$collection)) {
shiny.collections::insert(mydata,
list(c = 1, b="a", a = TRUE))
shiny.collections::insert(mydata,
list(c = 3.14, b="xx", a = TRUE))
shiny.collections::insert(mydata,
list(c = 100, b="some text", a = FALSE))
}
})
# Reactive which gives list with changes.
change_list <- reactive({
changes <- NULL
if(!is.null(input$hot$changes$changes)) {
changes <- input$hot$changes$changes %>%
map(function (change) {
# +1 is needed as JS and R indexing differs.
row <- change[[1]] + 1
col <- change[[2]] + 1
new_value <- change[[4]]
list(row = row, col = col, val = new_value)
})
}
changes[[1]]
})
# Here we observe for a change and update mydata using shiny.collections
# insert function.
observe({
if (!is.null(change_list()$val)) {
change_row <- as.list(mydata$collection[change_list()$row, ])
change_col <- names(mydata$collection)[[change_list()$col]]
change_row[[change_col]] <- change_list()$val
shiny.collections::insert(mydata,
change_row,
conflict = "update")
}
})
output$hot <- renderRHandsontable({
rhandsontable(mydata$collection[column_names], useTypes = TRUE) %>%
hot_table(readOnly = FALSE)
})
}
shinyApp(ui = ui, server = server)
Elements of collection are returned in alphabetical order. Modifying line 55 to
change_col <- column_names[[change_list()$col]]
can make it more helpful.
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An example of synchronized rhandsontable via shiny.collections.