how to test to see if widget switch is on or off

Getting Started Newbie Questions
#1

how do you test to see if a widget switch is on or off???

here is what i have

[lua]

local function onsfxSwitchRelease()

–want to test if the switch is on or off and save the result to my icebox here

return true

end

function scene:createScene( event )

    local group = self.view

        -----------------------------------------------------------------------------

        –      CREATE display objects and add them to ‘group’ here.

        –      Example use-case: Restore ‘group’ from previously saved state.

        –        Use following format: group:insert( Name )

        -----------------------------------------------------------------------------

        

        – display a background image

    local background = display.newImageRect( “background3.png”, display.contentWidth, display.contentHeight )

    background:setReferencePoint( display.TopLeftReferencePoint )

    background.x, background.y = 0, 0

    local myRoundedRect = display.newRoundedRect(134, 134, 500, 748, 12)

    myRoundedRect.strokeWidth = 8

    myRoundedRect:setFillColor(214, 214, 214)

    myRoundedRect:setStrokeColor(111, 111, 111)

    local sfxSwitch = widget.newSwitch

    {

    left = 500,

    top = 356,

    initialSwitchState = true,

    onPress = onsfxSwitchPress,

    onRelease = onsfxSwitchRelease,

    }

    

    group:insert( background )

    group:insert( myRoundedRect )

    group:insert( sfxSwitch )

end

[/lua]

i marked where i want it to test the value and save it to my icebox

any help appreciated.

#2

Not sure if you can get the state, but here is how to set it:  http://docs.coronalabs.com/api/type/SwitchWidget/setState.html

You may just have to create your own solution to get the state.

#3

ok, that’s the kind of page i was looking for.

what is the standard way of having a user say yes or no to a question and then have it do something if yes, or something else if no?

if there isn’t a standard way, how would address the switch from inside the function? just sfxSwitch?

#4

One thing, you’re switch is local to your createScene() function.  You need to probably take the local off of it in createScene() and put a:

local sfxSwitch

at the top of your program.  According to the docs:

http://docs.coronalabs.com/api/library/widget/newSwitch.html

There is a .isOn attribute for the switch.  See the example code where in the event handler they print the value of event.target.isOn?  event.target is the switch and if you do what I said above where you can have a reference to it outside of createScene you should be able to test for

sfxSwitch.isOn

#5

this is what i came up with:

[lua]

local sfxSwitch

local leftySwitch

local function onsfxSwitchRelease( event )

if event.target.isOn == true then

–code here

elseif event.target.isOn == false then

–code here

end

return true

end

function scene:createScene( event )
local group = self.view

sfxSwitch = widget.newSwitch
{
left = 500,
top = 356,
initialSwitchState = true,
onRelease = onsfxSwitchRelease( event ),
}
–in group here

end

[/lua]

but i get an error saying “attempt to index field ‘target’ (a nil value)”

#6

Line #18

onRelease = onsfxSwitchRelease( event ),

don’t need to have the ( event ) attached to the end of onsfxSwitchRelease.   Take that off and you won’t get the error, however, I get no indication the event is captured when I use ‘onEvent’ or ‘onRelease’

try this instead at line 18:

onPress = onsfxSwitchRelease,

it works.

Good luck.

#7

Line #18

onRelease = onsfxSwitchRelease( event ),

 

don’t need to have the ( event ) attached to the end of onsfxSwitchRelease.   Take that off and you won’t get the error, however, I get no indication the event is captured when I use ‘onEvent’ or ‘onRelease’

 

try this instead at line 18:

 

onPress = onsfxSwitchRelease,

 

it works.

 

Good luck.

#8

ok, changed to this and it still doesn’t work.

[lua]

local sfxSwitch

local function onsfxSwitchRelease()

    

    local switch = event.target  --THIS IS LINE 42

    

    if switch.isOn == true then

    

    local rect = display.newRoundedRect(245, 25, 80, 80, 12)

    rect.strokeWidth = 3

    rect:setFillColor(255, 255, 255)

    rect:setStrokeColor(0, 0, 0)

    

    

    end

    

    return true

end

function scene:createScene( event )

    local group = self.view

sfxSwitch = widget.newSwitch

    {

    left = 500,

    top = 356,

    initialSwitchState = true,

    onPress = onsfxSwitchRelease(),

    }

    

–group stuff

end

[/lua]

im getting …42: attempt to index global ‘event’ (a nil value) now…

i also tried if sfxSwitch.isOn == true then like Mr. Miracle said, gives me an error about trying to index a nil value

#9 
 local function onsfxSwitchRelease(event) local switch = event.target if event.phase == "ended" then if switch.isOn == true then local rect = display.newRoundedRect(245, 25, 80, 80, 12) rect.strokeWidth = 3 rect:setFillColor(255, 255, 255) rect:setStrokeColor(0, 0, 0) end end return true end function scene:createScene( event ) local group = self.view sfxSwitch = widget.newSwitch { left = 500, top = 356, initialSwitchState = true, onPress = onsfxSwitchRelease, } --group stuff end
#10

@Jon- thanks for the reply, but i got it sorted out by moving the whole local function into the create scene function, which i don’t see a problem with (this remains to be seen in the long run).  I also added a part where if it was false it would display a different color rect, so it seems to work alright.  Now i have to add in my ICE code :wacko:…

#11

icero,

The code changes I noted earlier would and do work.  I noticed in the code you listed in your response to my suggestion, that you just had 2 things mis-typed from what I had noted.  Those 2 things made it fail.

Line 5 : 

local function onsfxSwitchRelease() – won’t work

local function onsfxSwitchRelease( event ) – works … must have ‘event’ inside the ’ ( ) ’

Line 33 : 

onPress = onsfxSwitchRelease(), – won’t work

onPress = onsfxSwitchRelease, – works … remove the ’ ( ) ’ , cannot have them there

So,

when you call the onPress, do not use ’ ( ) ', just the name of the function  ‘onsfxSwitchRelease’

when you are going to use  ‘event’ inside the function, be sure it is in the  ’ (  ) ’

I hope you get it all running smooth!

#12

oh, i see what you were saying now, i pretty much did that same thing you suggested, but put it in the main create function to get it to work

I got ICE up and running, and it is saving the settings alright, and reading them for now.  I only have one more major problem with my game at this point and that is users can drag their finger off a button widget if the accidentally click on it and it won’t register a onRelease event(which it is critical it does).  You guys have any idea on how to fix that???

#13

Not sure if you can get the state, but here is how to set it:  http://docs.coronalabs.com/api/type/SwitchWidget/setState.html

You may just have to create your own solution to get the state.

#14

ok, that’s the kind of page i was looking for.

what is the standard way of having a user say yes or no to a question and then have it do something if yes, or something else if no?

if there isn’t a standard way, how would address the switch from inside the function? just sfxSwitch?

#15

One thing, you’re switch is local to your createScene() function.  You need to probably take the local off of it in createScene() and put a:

local sfxSwitch

at the top of your program.  According to the docs:

http://docs.coronalabs.com/api/library/widget/newSwitch.html

There is a .isOn attribute for the switch.  See the example code where in the event handler they print the value of event.target.isOn?  event.target is the switch and if you do what I said above where you can have a reference to it outside of createScene you should be able to test for

sfxSwitch.isOn

#16

this is what i came up with:

[lua]

local sfxSwitch

local leftySwitch

local function onsfxSwitchRelease( event )

if event.target.isOn == true then

–code here

elseif event.target.isOn == false then

–code here

end

return true

end

function scene:createScene( event )
local group = self.view

sfxSwitch = widget.newSwitch
{
left = 500,
top = 356,
initialSwitchState = true,
onRelease = onsfxSwitchRelease( event ),
}
–in group here

end

[/lua]

but i get an error saying “attempt to index field ‘target’ (a nil value)”

#17

Line #18

onRelease = onsfxSwitchRelease( event ),

don’t need to have the ( event ) attached to the end of onsfxSwitchRelease.   Take that off and you won’t get the error, however, I get no indication the event is captured when I use ‘onEvent’ or ‘onRelease’

try this instead at line 18:

onPress = onsfxSwitchRelease,

it works.

Good luck.

#18

Line #18

onRelease = onsfxSwitchRelease( event ),

 

don’t need to have the ( event ) attached to the end of onsfxSwitchRelease.   Take that off and you won’t get the error, however, I get no indication the event is captured when I use ‘onEvent’ or ‘onRelease’

 

try this instead at line 18:

 

onPress = onsfxSwitchRelease,

 

it works.

 

Good luck.

#19

ok, changed to this and it still doesn’t work.

[lua]

local sfxSwitch

local function onsfxSwitchRelease()

    

    local switch = event.target  --THIS IS LINE 42

    

    if switch.isOn == true then

    

    local rect = display.newRoundedRect(245, 25, 80, 80, 12)

    rect.strokeWidth = 3

    rect:setFillColor(255, 255, 255)

    rect:setStrokeColor(0, 0, 0)

    

    

    end

    

    return true

end

function scene:createScene( event )

    local group = self.view

sfxSwitch = widget.newSwitch

    {

    left = 500,

    top = 356,

    initialSwitchState = true,

    onPress = onsfxSwitchRelease(),

    }

    

–group stuff

end

[/lua]

im getting …42: attempt to index global ‘event’ (a nil value) now…

i also tried if sfxSwitch.isOn == true then like Mr. Miracle said, gives me an error about trying to index a nil value

#20 
 local function onsfxSwitchRelease(event) local switch = event.target if event.phase == "ended" then if switch.isOn == true then local rect = display.newRoundedRect(245, 25, 80, 80, 12) rect.strokeWidth = 3 rect:setFillColor(255, 255, 255) rect:setStrokeColor(0, 0, 0) end end return true end function scene:createScene( event ) local group = self.view sfxSwitch = widget.newSwitch { left = 500, top = 356, initialSwitchState = true, onPress = onsfxSwitchRelease, } --group stuff end