@Diviyan wrote:
Hey. Im very new to Dash and R language. So, i need the help you guys. My problem is regarding the upload component for DashR. Whenever i run the code, I would able to click and choose the file that i wanted to be uploaded. But it wouldn’t display the content of the file. I am receiving ’ error: could not find function “parse_content” ’
This is my code.
library(dashCoreComponents)
library(dashHtmlComponents)
library(dash)
library(anytime)app <- Dash$new()
app$layout(htmlDiv(list(
dccUpload(
id=‘upload-data’,
children=htmlDiv(list(
'Drag and Drop or ',
htmlA(‘Select Files’)
)),
style=list(
‘width’= ‘100%’,
‘height’= ‘60px’,
‘lineHeight’= ‘60px’,
‘borderWidth’= ‘1px’,
‘borderStyle’= ‘dashed’,
‘borderRadius’= ‘5px’,
‘textAlign’= ‘center’,
‘margin’= ‘10px’
),
# Allow multiple files to be uploaded
multiple=TRUE
),
htmlDiv(id=‘output-data-upload’)
)))parse_contents = function(contents, filename, date){
content_type = strsplit(contents, “,”)
content_string = strsplit(contents, “,”)
decoded = base64_dec(content_string)if(‘csv’ %in% filename){
df = read.csv(utf8::as_utf8(decoded))
} else if(‘xls’ %in% filename){
df = read.table(decoded, encoding = ‘bytes’)
} else{
return(htmlDiv(list(
‘There was an error processing this file.’
)))
}return(htmlDiv(list(
htmlH5(filename),
htmlH6(anytime(date)),
dashDataTable(df_to_list(‘records’),columns = lapply(colnames(df), function(x){list(‘name’ = x, ‘id’ = x)})),
htmlHr(),
htmlDiv(‘Raw Content’),
htmlPre(paste(substr(toJSON(contents), 1, 100), “…”), style=list(
‘whiteSpace’= ‘pre-wrap’,
‘wordBreak’= ‘break-all’
))
)))
}app$callback(
output = list(id=‘output-data-upload’, property = ‘children’),
params = list(input(id = ‘upload-data’, property = ‘contents’),
state(id = ‘upload-data’, property = ‘filename’),
state(id = ‘upload-data’, property = ‘last_modified’)),
function(list_of_contents, list_of_names, list_of_dates){
if(is.null(list_of_contents) == FALSE){
children = lapply(1:length(list_of_contents), function(x){
parse_content(list_of_contents[], list_of_names[], list_of_dates[])
})} return(children)})
app$run_server()
Feel free to help me. Thanks!
Posts: 2
Participants: 2