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Unread 07-06-2011, 02:35 PM
Fortunis's Avatar
Fortunis Fortunis is offline
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ListBox number/string error (Help!) [SOLVED]

Heres the scenerio. Im making a Listbox for user input. The input range is 0-9999 and everything works according to plan with this until the next step.
Im placing an if-then-else-end statement in to check that no other characters/letters are used, for the listbox to be wiped clean and a message to the user that they inputted illegal data, but im getting 'attempt to compare number with nil' error.

Is there anything i can do to either allow the lua to ignore the error and carryon with the if-then-else-end statement or allow it to not do an error at all?

heres the code i have at the moment-

Code:
     ImageAmountInput:SetWantsKeyEvents( true );
     
     ImageAmountInput.KeyDown = function( sender, args )
        
        if args.Action == 162 then
            OpWindow:Activate();
            ImageAmountInput:SetSelection( 1, 4 );
            IAI = ImageAmountInput:GetText();
            IAI = tonumber( IAI );

            if  IAI >= 0 and IAI <= 9999 then -- ERROR produced here if non-numerical characters are used in user input box.
                ImageAmountInput:SetSelection( 0, 0 );
            else
                ImageAmountInput:SetText( "" );
                print ( "You entered an illegal entry" );
            end

        end

     end
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Last edited by Fortunis : 07-06-2011 at 03:14 PM.
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  #2  
Unread 07-06-2011, 02:40 PM
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MrJackdaw MrJackdaw is offline
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You could always use a function to strip out the non-numeric characters and then check if it equals that which was entered.

Lua string tutorial at; http://lua-users.org/wiki/StringLibraryTutorial
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  #3  
Unread 07-06-2011, 02:47 PM
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Fortunis Fortunis is offline
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Hehe, ive just added an if-then-end before it to check if its not tonumber( IAI )

I guess the small break from staring at code gave me a little brain boost.

p.s. thanks for your fast response btw MrJackdaw



edit-


Code:
ImageAmountInput:SetWantsKeyEvents( true );
    ImageAmountInput.KeyDown = function( sender, args )
        
        if args.Action == 162 then
            OpWindow:Activate();
            ImageAmountInput:SetSelection(1, 4);
            IAI = ImageAmountInput:GetText();
            IAI = tonumber( IAI );
            if not tonumber( IAI ) then -- <--- Fixes everything
                ImageAmountInput:SetText( "" );
                print ( "You entered an illegal entry" );
            elseif  IAI >= 0 and IAI <= 9999 then -- ERROR produced here if string characters used in user input box. Need to figure out a way to ignore erroring.
                ImageAmountInput:SetSelection(0,0);
            end
        end
    end
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Last edited by Fortunis : 07-06-2011 at 02:52 PM.
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