LiveCode Forums.

I'm asking user input to create a file - how do I detect invalid characters (!@#$%^&*) entered? - I do not even know what all the invalid characters are.

Or if I can just determine if just alphanumerics was entered ??

Thanks,

Carel

Hi Carel,
Here is a manual way: Put that in your field.
There is "isNumber" which I probably could have used up there.
Of course this does not work with "ask file".

Simon

Thanks for the info Simon but it is not working for me.

I have the following:

I have a button "save", and text field "LessonName" in which the user types the filename.

I do not understand the "is not in" it just don't make sense to me, maybe you can explain the use of it?

on mouseUp
put "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,1,2,3,4,5,6,7,8,9,0,-, ,." into tLetters
if field "LessonName" is not in tLetters then
answer "Invalid Lesson Name"
exit mouseUp
else
pass mouseUp
end if
local tFullUrl
global workingfolder
put WorkingFolder & "/" && field "LessonName" & ".sws" into tFullUrl
open file tFullUrl for write
write WordsToAdd to file tFullUrl
close file tFullUrl
go to card 4
end mouseUp

Thanks,

Carel

Hi Carel,
You skipped the "on keyDown"?
You should put the script I posted into the script of the field "LessonName"
It will test each key pressed to see if it matches a number or letter in tName.
So it ends up as:
is "h" in this list "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,1,2,3,4,5,6,7,8,9,0,-, ,." (no case sesitivity)

Simon

Thanks Simon, I get it now.

I think I'll just set a Boolean variable instead of the message and then just evaluate the Boolean when the user click on the Save button and tell him it is invalid.

Thanks,

Carel

Just one more thing - What does pass keyDown do?

pass the key to the field?

Would I then have to do:

if tKey is not in tLetters then
put false into AllValidCharactersEntered
pass keyDown
end if

pass keyDown allows the key to go into the field.
Without that the message just stops there.

If you just had:
No keys would ever leave that message.

Simon

OK, Thank you!