Filenames multiply when pagereloads

[Rikard]

Hi I am very new to this program and programming.
But I have managed to put together a test project with some help from examples.
I have a couple of pages that takes me to an file browser, on the file browser page I have a back button ""Page.Navigate(PAGE_BACKWARD)"" when I then return to the file browser page it shows 2 of each file next time 3 and so on.
What can I do to prevent that?

Here is my code on the file browser page:

ON PRELOAD

--populate a table with all the files
med_file = File.Find(_SourceFolder.."\\AutoPlay\\Docs\\Anlägg ningsdata", "*", false, false, nil);

zero_file = File.Find(_SourceFolder.."\\AutoPlay\\Docs\\Anlägg ningsdata", "*", false, false, nil);


-- An if statement that compares two numbers

if zero_file == nil then
-- Do something here

do return end
else
--do the following for each file:
for j,file_path in med_file do
--add the item to the listbox, with the name visible and path as data
ListBox.AddItem("File List", String.SplitPath(file_path).Filename, file_path);
end

--Allow the listbox to display the updated content
ListBox.SetUpdate("File List", true);
end

[Worm]

Before you add anything to the Listbox, remove all items to ensure that you don't get duplicates.

Hi I am very new to this program and programming.
But I have managed to put together a test project with some help from examples.
I have a couple of pages that takes me to an file browser, on the file browser page I have a back button ""Page.Navigate(PAGE_BACKWARD)"" when I then return to the file browser page it shows 2 of each file next time 3 and so on.
What can I do to prevent that?

Here is my code on the file browser page:

ON PRELOAD

--populate a table with all the files
med_file = File.Find(_SourceFolder.."\\AutoPlay\\Docs\\Anlägg ningsdata", "*", false, false, nil);

zero_file = File.Find(_SourceFolder.."\\AutoPlay\\Docs\\Anlägg ningsdata", "*", false, false, nil);


-- An if statement that compares two numbers

if zero_file == nil then
-- Do something here

do return end
else
--do the following for each file:
for j,file_path in med_file do
--add the item to the listbox, with the name visible and path as data
ListBox.AddItem("File List", String.SplitPath(file_path).Filename, file_path);
end

--Allow the listbox to display the updated content
ListBox.SetUpdate("File List", true);
end

[TJ_Tigger]

Before you add anything to the Listbox, remove all items to ensure that you don't get duplicates.

I only remember to do that once I have seen items added to the list multiple times.

[Rikard]

Thanks for the fast reply.
I will probebly ask another question soon again