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canvas shinyace
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library(shiny) | |
library(shinyAce) | |
modes <- getAceModes() | |
themes <- getAceThemes() | |
init <- "createData <- function(rows) { | |
data.frame(col1 = 1:rows, col2 = rnorm(rows)) | |
}" | |
l <- shiny::tagList( | |
shiny::tags$script(src='https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js'), | |
shiny::tags$script(src='https://html2canvas.hertzen.com/dist/html2canvas.js'), | |
shiny::tags$script('$(document).ready(function(){ | |
var element = $("#html-content-holder"); // global variable | |
var getCanvas; // global variable | |
$("#btn-Preview-Image").on("click", function () { | |
html2canvas(element[0]).then(function(canvas) { | |
$("#previewImage").empty() | |
$("#previewImage").append(canvas); | |
getCanvas = canvas; | |
}); | |
}); | |
$("#btn-Convert-Html2Image").click(function () { | |
html2canvas(element[0]).then(function(canvas) { | |
saveAs(canvas.toDataURL(), "canvas.png"); | |
}); | |
}); | |
function saveAs(uri, filename) { | |
var link = document.createElement("a"); | |
if (typeof link.download === "string") { | |
link.href = uri; | |
link.download = filename; | |
//Firefox requires the link to be in the body | |
document.body.appendChild(link); | |
//simulate click | |
link.click(); | |
//remove the link when done | |
document.body.removeChild(link); | |
} else { | |
window.open(uri); | |
} | |
} | |
});')) | |
# define UI for application that demonstrates a simple Ace editor | |
ui <- pageWithSidebar( | |
headerPanel("Simple Shiny Ace!"), | |
sidebarPanel( | |
l, | |
selectInput("mode", "Mode: ", choices = modes, selected = "r"), | |
selectInput("theme", "Theme: ", choices = themes, selected = "ambience"), | |
numericInput("size", "Tab size:", 4), | |
radioButtons("soft", NULL, c("Soft tabs" = TRUE, "Hard tabs" = FALSE), inline = TRUE), | |
radioButtons("invisible", NULL, c("Hide invisibles" = FALSE, "Show invisibles" = TRUE), inline = TRUE), | |
actionButton("reset", "Reset text"), | |
actionButton("clear", "Clear text"), | |
actionButton('btn-Preview-Image','preview'), | |
actionButton('btn-Convert-Html2Image','Download'), | |
HTML("<hr />"), | |
helpText(HTML("A simple Shiny Ace editor. | |
<p>Created using <a href = \"http://github.com/trestletech/shinyAce\">shinyAce</a>."))), | |
mainPanel( | |
shiny::tags$div(id = 'html-content-holder', | |
aceEditor( | |
outputId = "ace", | |
# to access content of `selectionId` in server.R use `ace_selection` | |
# i.e., the outputId is prepended to the selectionId for use | |
# with Shiny modules | |
selectionId = "selection", | |
value = init, | |
placeholder = "Show a placeholder when the editor is empty ...") | |
), | |
shiny::tags$h3('Preview'), | |
shiny::tags$div(id = 'previewImage') | |
) | |
) | |
# define server logic required to generate simple ace editor | |
server <- function(input, output, session) { | |
output$downloadData <- downloadHandler( | |
filename = function() { | |
paste('carbonace-', Sys.Date(), '.png', sep='') | |
}, | |
content = function(con) { | |
write.csv(data, con) | |
} | |
) | |
observe({ | |
updateAceEditor( | |
session, | |
"ace", | |
theme = input$theme, | |
mode = input$mode, | |
tabSize = input$size, | |
useSoftTabs = as.logical(input$soft), | |
showInvisibles = as.logical(input$invisible) | |
) | |
}) | |
observeEvent(input$reset, { | |
updateAceEditor(session, "ace", value = init) | |
}) | |
observeEvent(input$clear, { | |
updateAceEditor(session, "ace", value = "") | |
}) | |
} | |
options(shiny.launch.browser = TRUE) | |
# Return a Shiny app object | |
shinyApp(ui = ui, server = server) |
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