Filename in text box using tcltk in R - r

Question

Using tcltk to create a GUI in R, I want to make a non-editable text box that displays the name of the save file that was selected by the user. I am able to create the button and the box, but I cannot figure out how to display the name of the selected file. I think I need to use tkinsert()
This is what I have so far:
library(tcltk)
library(tcltk2)
library(readxl)
test1 <- tktoplevel()
tkwm.title(test1, "Test 1")
tkgrid.rowconfigure(test1, 4)
tkgrid.columnconfigure(test1, 3)
getXlsx <- function() {
xlsheet <- tclvalue(tkgetOpenFile(
filetypes = "{ {Excel Files} {.xlsx} } { {All Files} * }"))
a <- read_excel(xlsheet)
assign("a", a, envir = .GlobalEnv)
}
test1$env$butSelect1 <- tk2button(test1, text = " Select File ", command
= getXlsx)
tkgrid(test1$env$butSelect1, padx = c(10,0), pady = 10, column = 0, row =
0)
test1$env$txt1 <- tk2text(test1, width = 40, height = 1)
tkgrid(test1$env$txt1, padx = c(10,10), pady = 10, column = 1, row = 0,
columnspan = 2)
tkconfigure(test1$env$txt1, state = "disabled")
### tkinsert(test1$env$txt1, ???) ###
Any help would be greatly appreciated, thank you.

Answer 1

I got it now, I had to add 4 lines to the function itself:
getXlsx <- function() {
xlsheet <- tclvalue(tkgetOpenFile(
filetypes = "{ {Excel Files} {.xlsx} } { {All Files} * }"))
a <- read_excel(xlsheet)
assign("a", a, envir = .GlobalEnv)
assign("z", xlsheet, envir = .GlobalEnv)
tkconfigure(test1$env$txt1, state = "normal")
tkinsert(test1$env$txt1, "end", z)
tkconfigure(test1$env$txt1, state = "disabled")
}
This creates a new "z" value in the global environment with the path name, then allows the text box to be editable, then adds the path name, then makes the text box non-editable again.