Possible to Pass Parameters in Event Function?

Getting Started Newbie Questions
1

I am trying to pass parameters in an event function.  I have a native input function and would like to be able to use it to input to different tables if possible.  

I know this is not correct, but conceptually I would like to do something like this:

local function textListener( event, table )     if event.phase == "began" then          event.target.text = ''     elseif event.phase == "submitted" then         text1 = event.target.text         native.setKeyboardFocus(nil)         table.insert(table, text1)         print(table.concat(table, ", "))     end end local function callAhead()     textListener(table1) end  defaultField = native.newTextField( 10, 50, 180, 23 ) defaultField:addEventListener( "userInput", callAhead)  

Am I able to do something like this or am I going to have to create a new textListener function every time I want to input something into a different table?

2 
local function textListener( event, table ) if event.phase == "began" then event.target.text = '' elseif event.phase == "submitted" then text1 = event.target.text native.setKeyboardFocus(nil) table.insert(table, text1) print(table.concat(table, ", ")) end end local function callAhead(event) textListener(event, table1) end defaultField = native.newTextField( 10, 50, 180, 23 ) defaultField:addEventListener( "userInput", callAhead)

Not sure if I got it correctly, but basically like this callAhead will get the event, that you then pass to your textListener function, with everything else you’d like to pass as well.

3

Not exactly sure what you want to do, but here are something to consider if you had not realized:

[lua]local function textListener( event )

    if event.phase == “began” then 

        local target = event.target – event.target is the object the touch listener is on

        local myValue = target.someValueIWantToUseInTouchListener

    end

end

defaultField = native.newTextField( 10, 50, 180, 23 )

defaultField.someValueIWantToUseInTouchListener = “foo”

defaultField:addEventListener( “userInput”, textListener)

[/lua]

4

Hach, I guess I was going for something like this that you need to use to pass a parameter in a transition onComplete function: 

local square = display.newRect(50,50,50,50) stretch = function(obj)     obj.xScale = 2 end       callAhead = function()     stretch(square)  end  transition.to(square, {x = 200, y = 200, time = 2000, onComplete = callAhead})  

Jon, that I haven’t tried anything like that, will check it out and let you know.  

5

Here is another way of doing the same thing just little bit more contained

[lua]

local square = display.newRect(50,50,50,50)

local stretch = function(obj)

    obj.xScale = 2

end 

    

transition.to(square, {x = 200, y = 200, time = 1000, onComplete = function() stretch(square) end})

[/lua]

but in that example the square is still in scope inside stretch function so you can also just do

[lua]

local square = display.newRect(50,50,50,50)

local stretch = function()

    square.xScale = 2

end 

    

transition.to(square, {x = 200, y = 200, time = 1000, onComplete = stretch})

[/lua]

6

Or you could use an anonymous funciton:

[lua]

defaultField:addEventListener( “userInput”,

function(event, table1)

textListener(event, table1)

end)

[/lua]

I’m not sure where table1 is however so you’ll need to check on your scoping…

7

Nailed it.  You’re the man, thanks.  

8 
local function textListener( event, table ) if event.phase == "began" then event.target.text = '' elseif event.phase == "submitted" then text1 = event.target.text native.setKeyboardFocus(nil) table.insert(table, text1) print(table.concat(table, ", ")) end end local function callAhead(event) textListener(event, table1) end defaultField = native.newTextField( 10, 50, 180, 23 ) defaultField:addEventListener( "userInput", callAhead)

Not sure if I got it correctly, but basically like this callAhead will get the event, that you then pass to your textListener function, with everything else you’d like to pass as well.

9

Not exactly sure what you want to do, but here are something to consider if you had not realized:

[lua]local function textListener( event )

    if event.phase == “began” then 

        local target = event.target – event.target is the object the touch listener is on

        local myValue = target.someValueIWantToUseInTouchListener

    end

end

defaultField = native.newTextField( 10, 50, 180, 23 )

defaultField.someValueIWantToUseInTouchListener = “foo”

defaultField:addEventListener( “userInput”, textListener)

[/lua]

10

Hach, I guess I was going for something like this that you need to use to pass a parameter in a transition onComplete function: 

local square = display.newRect(50,50,50,50) stretch = function(obj)     obj.xScale = 2 end       callAhead = function()     stretch(square)  end  transition.to(square, {x = 200, y = 200, time = 2000, onComplete = callAhead})  

Jon, that I haven’t tried anything like that, will check it out and let you know.  

11

Here is another way of doing the same thing just little bit more contained

[lua]

local square = display.newRect(50,50,50,50)

local stretch = function(obj)

    obj.xScale = 2

end 

    

transition.to(square, {x = 200, y = 200, time = 1000, onComplete = function() stretch(square) end})

[/lua]

but in that example the square is still in scope inside stretch function so you can also just do

[lua]

local square = display.newRect(50,50,50,50)

local stretch = function()

    square.xScale = 2

end 

    

transition.to(square, {x = 200, y = 200, time = 1000, onComplete = stretch})

[/lua]

12

Or you could use an anonymous funciton:

[lua]

defaultField:addEventListener( “userInput”,

function(event, table1)

textListener(event, table1)

end)

[/lua]

I’m not sure where table1 is however so you’ll need to check on your scoping…

13

Nailed it.  You’re the man, thanks.