I have one scene in which inside a function a scrollview is being generated and added to it some text elements. Now when I go to another scene, the scrollview is not getting removed. Even if I add a background image in the second scene, the scrollview is shown on top of it. I would like to know a way to remove or hide or send it back to the new scene… Thanks in advance…
Sounds like you’re not adding the scrollView to your scene’s view group.
Rob
As I am new to corona, I don’t know how to add and object into sceneGroup from another function other than the create function… Pls tell me how ? When I try to add it to a global sceneGroup which I created, it returns nil value error…
At the top of your .lua file:
[lua]
local sceneGroup = display.newGroup()
[/lua]
Then remove the local from the sceneGroup = self.view part of your scene: functions.
You can then add objects to sceneGroup from anywhere in the scene.
I will post the relevant code snippets from my scene lua file
local function onDeptPress( event )
local sceneGroup = display.newGroup() — is this usage correct… ?
switch = event.target
deptId = switch.id
local deptHeader = “”
removeData()
if deptId== “ce” then
deptHeader = “Civil”
end
if deptId == “me” then
deptHeader = “Mechanical”
end
--…
--…
--…
--…
local taskBarTop = display.newRect(0, 0, display.contentWidth, display.contentHeight/15)
taskBarTop:setFillColor(0.255,0.255,0.858)
taskBarTop.x = display.contentCenterX
taskBarTop.y = display.contentCenterY/15
deptName = display.newText( deptHeader, 50, 50, native.systemFont, 28 )
deptName:setFillColor( 0, 1, 0 )
deptName.x = display.contentWidth/2
deptName.y = 16
loadData()
------------------display the buttons and names--------start---------------------
myData.dataScrollView = widget.newScrollView({
width = 270,
height = 395,
scrollWidth = 260,
scrollHeight = 900,
horizontalScrollDisabled = true,
backgroundColor = { 0.9, 0.9, 0.9 }
})
myData.dataScrollView.x = display.contentCenterX+18
myData.dataScrollView.y = display.contentHeight/2-20
sceneGroup:insert(dataScrollView) – error shows when this line is added
--…
--…
numList[i] = display.newText(people[i].Phones,50, 200, native.systemFont, 13)
numList[i]:setFillColor( 1, 0, 1,0.7 )
numList[i].x = nameList[i].x +5
numList[i].y = yOffset+10
numList[i].anchorX = 0
myData.dataScrollView:insert(numList[i])
--…
--similarly some textList is also added to the scrollview
--…
--…
end
local function handleDataBtn( … )
composer.gotoScene(“editData”)
end
–
---- when i switch to editData scene, the scrollview already created in menu lua is still showing up with the items added to it
-----I tried in many ways but no use… I would like to know how to use the other functions of show, hide destroy etc…
thanks
thanks sherman, let me try that… 
If you’re using composer, inside scene:create() and scene:show(), there should already be a line:
local sceneGroup = self.view
Any objects you create in those two functions you need to insert them:
local myObject = display.newRect( 100, 100, 50, 50 ) sceneGroup:insert( myObject )
You should probably leave the “local” on the declaration.
If you’re creating objects in some other function in the scene that’s not inside scene:create() or scene:show() then you can access the scene’s view group like this:
local sceneGroup = scene.view local myObject = display.newRect( 100, 100, 50, 50 ) sceneGroup:insert( myObject )
If you’re not using Composer, then you can create your own display.newGroup() as suggested above.
Rob
Yesssss… Rob, that worked great…thanks a lot… spent 3 nights and two days…
thanks again…
Sounds like you’re not adding the scrollView to your scene’s view group.
Rob
As I am new to corona, I don’t know how to add and object into sceneGroup from another function other than the create function… Pls tell me how ? When I try to add it to a global sceneGroup which I created, it returns nil value error…
At the top of your .lua file:
[lua]
local sceneGroup = display.newGroup()
[/lua]
Then remove the local from the sceneGroup = self.view part of your scene: functions.
You can then add objects to sceneGroup from anywhere in the scene.
I will post the relevant code snippets from my scene lua file
local function onDeptPress( event )
local sceneGroup = display.newGroup() — is this usage correct… ?
switch = event.target
deptId = switch.id
local deptHeader = “”
removeData()
if deptId== “ce” then
deptHeader = “Civil”
end
if deptId == “me” then
deptHeader = “Mechanical”
end
--…
--…
--…
--…
local taskBarTop = display.newRect(0, 0, display.contentWidth, display.contentHeight/15)
taskBarTop:setFillColor(0.255,0.255,0.858)
taskBarTop.x = display.contentCenterX
taskBarTop.y = display.contentCenterY/15
deptName = display.newText( deptHeader, 50, 50, native.systemFont, 28 )
deptName:setFillColor( 0, 1, 0 )
deptName.x = display.contentWidth/2
deptName.y = 16
loadData()
------------------display the buttons and names--------start---------------------
myData.dataScrollView = widget.newScrollView({
width = 270,
height = 395,
scrollWidth = 260,
scrollHeight = 900,
horizontalScrollDisabled = true,
backgroundColor = { 0.9, 0.9, 0.9 }
})
myData.dataScrollView.x = display.contentCenterX+18
myData.dataScrollView.y = display.contentHeight/2-20
sceneGroup:insert(dataScrollView) – error shows when this line is added
--…
--…
numList[i] = display.newText(people[i].Phones,50, 200, native.systemFont, 13)
numList[i]:setFillColor( 1, 0, 1,0.7 )
numList[i].x = nameList[i].x +5
numList[i].y = yOffset+10
numList[i].anchorX = 0
myData.dataScrollView:insert(numList[i])
--…
--similarly some textList is also added to the scrollview
--…
--…
end
local function handleDataBtn( … )
composer.gotoScene(“editData”)
end
–
---- when i switch to editData scene, the scrollview already created in menu lua is still showing up with the items added to it
-----I tried in many ways but no use… I would like to know how to use the other functions of show, hide destroy etc…
thanks
thanks sherman, let me try that…
If you’re using composer, inside scene:create() and scene:show(), there should already be a line:
local sceneGroup = self.view
Any objects you create in those two functions you need to insert them:
local myObject = display.newRect( 100, 100, 50, 50 ) sceneGroup:insert( myObject )
You should probably leave the “local” on the declaration.
If you’re creating objects in some other function in the scene that’s not inside scene:create() or scene:show() then you can access the scene’s view group like this:
local sceneGroup = scene.view local myObject = display.newRect( 100, 100, 50, 50 ) sceneGroup:insert( myObject )
If you’re not using Composer, then you can create your own display.newGroup() as suggested above.
Rob
Yesssss… Rob, that worked great…thanks a lot… spent 3 nights and two days…
thanks again…