[Closed] An update on a help file example

Jan 05, 2013 3:59 am

I came across this in the help file that i think is pretty useful…at least for what i need it for anyway.


     rollout MicroListener "MicroListener"
     	(
     	edittext myEditText text:""
     	label theLabel "Ready."
     	on myEditText changed txt do
     		(
     		 if txt != "" then
     		 (
     		  try
     		  (
     		   val = execute txt
     		   theLabel.text = "You typed in "+ (val as string )
     		  )
     		  catch 
     		   theLabel.text = "Invalid Expression!"
     		 )
     		 else
     		  theLabel.text = "Ready."
     		)
     	on myEditText entered txt do myEditText.text = ""
     	)
     createDialog MicroListener 300 60

I'm wondering if someone could show/explain how to allow for spaces and possibly a certain sequence of numbers.  The application that i would be using it for would limit the end user to typing in something like this:


    1 0 0 3.14159

Four numbers with a space in between each.

I'm really trying to learn how to error proof my scripts so any help would be greatly appreciated.

2 Replies

TimHawker

Jan 05, 2013 3:59 am

You will probably need something like the filterString function:


--This line:
stringArr = filterString "1 0 0 3.14159" " "
--Results in:
#("1", "0", "0", "3.14159")

Then you could convert the string number values into floats/intergers like so:


for a in stringArr collect a as float

It seems odd to combine 4 numbers into a string though. Would it not make more sense to have 4 spinners in the UI? This would require a lot less error checking and handling.

Tim

dellis

Jan 05, 2013 3:59 am

I may actually go the spinner route. It is being written into a custom file format so i was going to take the resulting string and place it where i need it in the file.