[Flashcoders] adjusting postion of dynamically loaded images
hello everyone
i am trying to set x positions of different images which are being
dynamically loaded depending upon their width
i m writting this code in a for loop
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener
(Event.COMPLETE, imgLoaded);
trace(width = + imageLoader[i].width);
function imgLoaded (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
but width comes out to be zero ..
help is needed
waiting for your response
--
--
--
Thanking You,
Pankaj Kumar Singh,
2nd Year Undergraduate Student,
Department of Agricultural and Food Engineering,
Indian Institute of Technology,
Kharagpur
Mobile - (+91) 8001231685
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Re: [Flashcoders] adjusting postion of dynamically loaded images
You should listen for the INIT event, not the COMPLETE one - the images
won't have a width until they are initialised.
Glen
On 01/07/2010 13:50, Pankaj Singh wrote:
hello everyone
i am trying to set x positions of different images which are being
dynamically loaded depending upon their width
i m writting this code in a for loop
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener
(Event.COMPLETE, imgLoaded);
trace(width = + imageLoader[i].width);
function imgLoaded (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
but width comes out to be zero ..
help is needed
waiting for your response
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Re: [Flashcoders] adjusting postion of dynamically loaded images
even after using INIT i m getting 0 width because event listener function is
never called (trace statement is not working)
for (var i:int=0; i lettersCount; i++)
{
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener(Event.INIT,
imgInitialised);
trace(width = + imageLoader[i].width);
function imgInitialised (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
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[Flashcoders] passing an array as a method = TypeError: Error #1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an array as a
parameter and store it inside the class in a property. This gives me the error
below and I'm stuck. Also I would like to know why if I change the code inside
the method setGabarito to just ( aRespGabarito = p1 ) it works...
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at trueFalse/setGabarito()
at tf_teste_fla::MainTimeline/frame1()
this is the class:
package {
import flash.display.Sprite;
public class trueFalse extends Sprite{
//propriedades
var nome:String;
var aRespGabarito:Array; //tera o gabarito do exercicio
//construtor
public function trueFalse(p1:String) {
nome = p1;
}
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
var data:Array = p1[r];
aRespGabarito[0] = data; -- ERROR HERE
trace(aRespGabarito[0]);
}
}
}
}
and this is the code inside the test movie:
var usuario:trueFalse = new trueFalse(aa);
var arrQuestao:Array = new Array();
arrQuestao[0] = [btV1,btX1,btV1,0];
arrQuestao[1] = [btV2,btX2,btX2,0];
arrQuestao[2] = [btV3,btX3,btX3,0];
usuario.setGabarito(arrQuestao);
thanks for any help,
rodrigo.
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Re: [Flashcoders] adjusting postion of dynamically loaded images
Try it in the second trace you have; it's not loaded When you're first tracing
Sent from my iPhone
On Jul 1, 2010, at 6:32 AM, Pankaj Singh singh.pankaj.iitkg...@gmail.com
wrote:
even after using INIT i m getting 0 width because event listener function is
never called (trace statement is not working)
for (var i:int=0; i lettersCount; i++)
{
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener(Event.INIT,
imgInitialised);
trace(width = + imageLoader[i].width);
function imgInitialised (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
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Re: [Flashcoders] adjusting postion of dynamically loaded images
Hi,
Are you storing your loaders somewhere outside the function - e.g. is
imageLoader an array outside the function? If not, your loaders may go
out of scope...
Also, your function imgInitialised may go out of scope because that is
declared inside the loop - not 100% about this, but try putting
imgInitialised outside your function that creates the loaders.
e.g. pseudo code:
var imageLoader:Array;
function loadImages() {
for(i = 0 to lettersCount) {
startLoading addEventListener
}
}
function imgInitialised(e:Event):void {
//hello from imgInitialised.
}
HTH
Glen
On 01/07/2010 14:32, Pankaj Singh wrote:
even after using INIT i m getting 0 width because event listener function is
never called (trace statement is not working)
for (var i:int=0; i lettersCount; i++)
{
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener(Event.INIT,
imgInitialised);
trace(width = + imageLoader[i].width);
function imgInitialised (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
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Re: [Flashcoders] adjusting postion of dynamically loaded images
Hi,
Oops, missed one - try calling load() after you added the listener...
Glen
On 01/07/2010 14:32, Pankaj Singh wrote:
even after using INIT i m getting 0 width because event listener function is
never called (trace statement is not working)
for (var i:int=0; i lettersCount; i++)
{
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener(Event.INIT,
imgInitialised);
trace(width = + imageLoader[i].width);
function imgInitialised (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
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RE: [Flashcoders] passing an array as a method = TypeError: Error #1009: Cannot access a property or method of a null object reference.
Data is an Array and p is a String
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: donderdag 1 juli 2010 15:36
To: Flash Coders List
Subject: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an array as
a parameter and store it inside the class in a property. This gives me the
error below and I'm stuck. Also I would like to know why if I change the
code inside the method setGabarito to just ( aRespGabarito = p1 ) it
works...
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at trueFalse/setGabarito()
at tf_teste_fla::MainTimeline/frame1()
this is the class:
package {
import flash.display.Sprite;
public class trueFalse extends Sprite{
//propriedades
var nome:String;
var aRespGabarito:Array; //tera o gabarito do exercicio
//construtor
public function trueFalse(p1:String) {
nome = p1;
}
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
var data:Array = p1[r];
aRespGabarito[0] = data; -- ERROR HERE
trace(aRespGabarito[0]);
}
}
}
}
and this is the code inside the test movie:
var usuario:trueFalse = new trueFalse(aa);
var arrQuestao:Array = new Array();
arrQuestao[0] = [btV1,btX1,btV1,0];
arrQuestao[1] = [btV2,btX2,btX2,0];
arrQuestao[2] = [btV3,btX3,btX3,0];
usuario.setGabarito(arrQuestao);
thanks for any help,
rodrigo.
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Re: [Flashcoders] passing an array as a method = TypeError: Error #1009: Cannot access a property or method of a null object reference.
thanks for your reply cor, you are correct, p1 is a parameter for the
constructor (as string) and for the method (as array).
Still, if i change the datatype of data to string the error persists
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
var data:String;
//copia os membros do array
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
//data = hello;
aRespGabarito[r] = data; -any of the declarations above for data
results in an error.
}
}
- Original Message -
From: Cor c...@chello.nl
To: 'Rodrigo Augusto Guerra' rodr...@alumni.org.br; 'Flash Coders
List' flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 10:42 AM
Subject: RE: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Data is an Array and p is a String
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: donderdag 1 juli 2010 15:36
To: Flash Coders List
Subject: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an array
as
a parameter and store it inside the class in a property. This gives me the
error below and I'm stuck. Also I would like to know why if I change the
code inside the method setGabarito to just ( aRespGabarito = p1 ) it
works...
TypeError: Error #1009: Cannot access a property or method of a null
object
reference.
at trueFalse/setGabarito()
at tf_teste_fla::MainTimeline/frame1()
this is the class:
package {
import flash.display.Sprite;
public class trueFalse extends Sprite{
//propriedades
var nome:String;
var aRespGabarito:Array; //tera o gabarito do exercicio
//construtor
public function trueFalse(p1:String) {
nome = p1;
}
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
var data:Array = p1[r];
aRespGabarito[0] = data; -- ERROR HERE
trace(aRespGabarito[0]);
}
}
}
}
and this is the code inside the test movie:
var usuario:trueFalse = new trueFalse(aa);
var arrQuestao:Array = new Array();
arrQuestao[0] = [btV1,btX1,btV1,0];
arrQuestao[1] = [btV2,btX2,btX2,0];
arrQuestao[2] = [btV3,btX3,btX3,0];
usuario.setGabarito(arrQuestao);
thanks for any help,
rodrigo.
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Re: [Flashcoders] passing an array as a method = TypeError: Error#1009: Cannot access a property or method of a null object reference.
thanks david, that did the trick...
I also realized that this MUST be done inside the method and not along with the
declaration on the top of the class, sorry abt my ignorance but why ?
thanks!
- Original Message -
From: David Hunter
To: rodr...@alumni.org.br
Sent: Thursday, July 01, 2010 11:45 AM
Subject: RE: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object reference.
are you missing the following?: aRespGabarito = new Array();
From: rodr...@alumni.org.br
To: flashcoders@chattyfig.figleaf.com
Subject: Re: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Date: Thu, 1 Jul 2010 11:28:28 -0300
thanks for your reply cor, you are correct, p1 is a parameter for the
constructor (as string) and for the method (as array).
Still, if i change the datatype of data to string the error persists
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
var data:String;
//copia os membros do array
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
//data = hello;
aRespGabarito[r] = data; -any of the declarations above for data
results in an error.
}
}
- Original Message -
From: Cor c...@chello.nl
To: 'Rodrigo Augusto Guerra' rodr...@alumni.org.br; 'Flash Coders
List' flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 10:42 AM
Subject: RE: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Data is an Array and p is a String
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: donderdag 1 juli 2010 15:36
To: Flash Coders List
Subject: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an array
as
a parameter and store it inside the class in a property. This gives me the
error below and I'm stuck. Also I would like to know why if I change the
code inside the method setGabarito to just ( aRespGabarito = p1 ) it
works...
TypeError: Error #1009: Cannot access a property or method of a null
object
reference.
at trueFalse/setGabarito()
at tf_teste_fla::MainTimeline/frame1()
this is the class:
package {
import flash.display.Sprite;
public class trueFalse extends Sprite{
//propriedades
var nome:String;
var aRespGabarito:Array; //tera o gabarito do exercicio
//construtor
public function trueFalse(p1:String) {
nome = p1;
}
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
var data:Array = p1[r];
aRespGabarito[0] = data; -- ERROR HERE
trace(aRespGabarito[0]);
}
}
}
}
and this is the code inside the test movie:
var usuario:trueFalse = new trueFalse(aa);
var arrQuestao:Array = new Array();
arrQuestao[0] = [btV1,btX1,btV1,0];
arrQuestao[1] = [btV2,btX2,btX2,0];
arrQuestao[2] = [btV3,btX3,btX3,0];
usuario.setGabarito(arrQuestao);
thanks for any help,
rodrigo.
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Re: [Flashcoders] adjusting postion of dynamically loaded images
thanks to everyone
my problem has been solved :D
On Thu, Jul 1, 2010 at 7:14 PM, Glen Pike g...@engineeredarts.co.uk wrote:
Hi,
Oops, missed one - try calling load() after you added the listener...
Glen
On 01/07/2010 14:32, Pankaj Singh wrote:
even after using INIT i m getting 0 width because event listener function
is
never called (trace statement is not working)
for (var i:int=0; i lettersCount; i++)
{
imageLoader[i].load (new URLRequest(
xmlLettersList[i].attribute(img)));
imageLoader[i].width = imageLoader[i].addEventListener(Event.INIT,
imgInitialised);
trace(width = + imageLoader[i].width);
function imgInitialised (e:Event):Number
{
var bm:Bitmap = Bitmap(e.target.content);
trace(inside function image Loaded);
return bm.width;
}
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--
--
--
Thanking You,
Pankaj Kumar Singh,
2nd Year Undergraduate Student,
Department of Agricultural and Food Engineering,
Indian Institute of Technology,
Kharagpur
Mobile - (+91) 8001231685
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RE: [Flashcoders] passing an array as a method = TypeError: Error#1009: Cannot access a property or method of a null object reference.
From your loop, you're accessing an array element that doesn't exist. I
would actually advise a different approach to the problem.
Don't use pure arrays within pure arrays (called multidimensional
arrays). I find it very hard to understand and maintain that code. It
can get confusing easily and doesn't easily allow for scalability. I
would have an array store class instances which are just classes with
public properties only (called value objects or VOs). One or more of
those properties of the VO instance can be an array, so you can have
nested logic and data, but you are effectively using an object array
object array structure, where the objects are defined by you, the
class-writer, instead of an array array array structure where you
have to do crazy ways to access the data. By using value object
instances, you are describing the data and structure. By using only
arrays within arrays, and no objects, you have neither structure
definition or data definition.
When you loop through an array, instead of this approach:
var tamanho = p1.length - 1 // o indice comeca com zero entao
tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
Assuming you create an array of class instances, I would recommend this
instead for simplicity's sake because I think the problem is the way you
are looping through the array:
var questionVO1:QuestionVO = new QuestionVO();
questionVO.question = Which fruit is yellow?;
questionVO.answer = Banana;
var questionVO2:QuestionVO = new QuestionVO();
questionVO2.question = What color is the sky?;
questionVO2.answer = Blue;
var myQuestions:Array = [questionVO1, questionVO2];
//So alternatively (not knowing exactly what you wrote your loop for),
as an example, you can
//loop through myQuestions and set all the VO's score property to 0,
like this:
for each (var questionVO:QuestionVO in myQuestions)
{
//set any property of each questionVO here
questionVO.score = 0;
}
//etc. I'd actually store the question information in XML and loop
through that to create these VO instances, but you get the point.
//So to check to see if the answer is right:
if(userResponseTextField1.text == questionVO1.answer)
{
questionVO.score++;
}
I'd actually take a more elegant approach than that for a quiz, but this
just shows you the basic form of how to check for the user's right
response.
Jason Merrill
Instructional Technology Architect
Bank of America Global Learning
Join the Bank of America Flash Platform Community and visit our
Instructional Technology Design Blog
(Note: these resources are only available for Bank of America
associates)
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: Thursday, July 01, 2010 10:28 AM
To: 'Flash Coders List'
Subject: Re: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object
reference.
thanks for your reply cor, you are correct, p1 is a parameter for the
constructor (as string) and for the method (as array).
Still, if i change the datatype of data to string the error persists
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
var data:String;
//copia os membros do array
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
//data = hello;
aRespGabarito[r] = data; -any of the declarations above for
data results in an error.
}
}
- Original Message -
From: Cor c...@chello.nl
To: 'Rodrigo Augusto Guerra' rodr...@alumni.org.br; 'Flash Coders
List' flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 10:42 AM
Subject: RE: [Flashcoders] passing an array as a method = TypeError:
Error
#1009: Cannot access a property or method of a null object reference.
Data is an Array and p is a String
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of
Rodrigo Augusto Guerra
Sent: donderdag 1 juli 2010 15:36
To: Flash Coders List
Subject: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an
array as a parameter and store it inside the class in a property. This
gives me the error below and I'm stuck. Also I would like to know why
if I change the code inside the method setGabarito to just (
aRespGabarito = p1 ) it works...
TypeError: Error #1009: Cannot access a property or method of a null
object reference.
at trueFalse/setGabarito()
at tf_teste_fla::MainTimeline/frame1()
this is the class:
package {
import flash.display.Sprite;
public class trueFalse extends Sprite{
//propriedades
var
Re: [Flashcoders] passing an array as a method = TypeError: Error#1009: Cannot access a property or method of a null object reference.
Thanks for your insights Jason.
At this moment I'm migrating some AS2 code to AS3 OOP, and as seen, I'm not
that familiar with OOP, that´s why these directions are *VERY* helpfull
welcome.
thanks.
- Original Message -
From: Merrill, Jason jason.merr...@bankofamerica.com
To: Rodrigo Augusto Guerra rodr...@alumni.org.br; Flash Coders List
flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 12:22 PM
Subject: RE: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object reference.
From your loop, you're accessing an array element that doesn't exist. I
would actually advise a different approach to the problem.
Don't use pure arrays within pure arrays (called multidimensional
arrays). I find it very hard to understand and maintain that code. It
can get confusing easily and doesn't easily allow for scalability. I
would have an array store class instances which are just classes with
public properties only (called value objects or VOs). One or more of
those properties of the VO instance can be an array, so you can have
nested logic and data, but you are effectively using an object array
object array structure, where the objects are defined by you, the
class-writer, instead of an array array array structure where you
have to do crazy ways to access the data. By using value object
instances, you are describing the data and structure. By using only
arrays within arrays, and no objects, you have neither structure
definition or data definition.
When you loop through an array, instead of this approach:
var tamanho = p1.length - 1 // o indice comeca com zero entao
tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
Assuming you create an array of class instances, I would recommend this
instead for simplicity's sake because I think the problem is the way you
are looping through the array:
var questionVO1:QuestionVO = new QuestionVO();
questionVO.question = Which fruit is yellow?;
questionVO.answer = Banana;
var questionVO2:QuestionVO = new QuestionVO();
questionVO2.question = What color is the sky?;
questionVO2.answer = Blue;
var myQuestions:Array = [questionVO1, questionVO2];
//So alternatively (not knowing exactly what you wrote your loop for),
as an example, you can
//loop through myQuestions and set all the VO's score property to 0,
like this:
for each (var questionVO:QuestionVO in myQuestions)
{
//set any property of each questionVO here
questionVO.score = 0;
}
//etc. I'd actually store the question information in XML and loop
through that to create these VO instances, but you get the point.
//So to check to see if the answer is right:
if(userResponseTextField1.text == questionVO1.answer)
{
questionVO.score++;
}
I'd actually take a more elegant approach than that for a quiz, but this
just shows you the basic form of how to check for the user's right
response.
Jason Merrill
Instructional Technology Architect
Bank of America Global Learning
Join the Bank of America Flash Platform Community and visit our
Instructional Technology Design Blog
(Note: these resources are only available for Bank of America
associates)
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: Thursday, July 01, 2010 10:28 AM
To: 'Flash Coders List'
Subject: Re: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object
reference.
thanks for your reply cor, you are correct, p1 is a parameter for the
constructor (as string) and for the method (as array).
Still, if i change the datatype of data to string the error persists
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
var data:String;
//copia os membros do array
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
//data = hello;
aRespGabarito[r] = data; -any of the declarations above for
data results in an error.
}
}
- Original Message -
From: Cor c...@chello.nl
To: 'Rodrigo Augusto Guerra' rodr...@alumni.org.br; 'Flash Coders
List' flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 10:42 AM
Subject: RE: [Flashcoders] passing an array as a method = TypeError:
Error
#1009: Cannot access a property or method of a null object reference.
Data is an Array and p is a String
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of
Rodrigo Augusto Guerra
Sent: donderdag 1 juli 2010 15:36
To: Flash Coders List
Subject: [Flashcoders] passing an array as a method = TypeError: Error
#1009: Cannot access a property or method of a null object reference.
Hi all,
I'm creating a simple class that has an method that will receive an
array as a
RE: [Flashcoders] passing an array as a method = TypeError:Error#1009: Cannot access a property or method of a null object reference.
Sure. This is anAS3 example, but you can still do the same thing with VOs in
AS2 as well.
Jason Merrill
Instructional Technology Architect
Bank of America Global Learning
Join the Bank of America Flash Platform Community and visit our Instructional
Technology Design Blog
(Note: these resources are only available for Bank of America associates)
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo Augusto
Guerra
Sent: Thursday, July 01, 2010 12:11 PM
To: Flash Coders List
Subject: Re: [Flashcoders] passing an array as a method = TypeError:Error#1009:
Cannot access a property or method of a null object reference.
Thanks for your insights Jason.
At this moment I'm migrating some AS2 code to AS3 OOP, and as seen, I'm not
that familiar with OOP, that´s why these directions are *VERY* helpfull
welcome.
thanks.
- Original Message -
From: Merrill, Jason jason.merr...@bankofamerica.com
To: Rodrigo Augusto Guerra rodr...@alumni.org.br; Flash Coders List
flashcoders@chattyfig.figleaf.com
Sent: Thursday, July 01, 2010 12:22 PM
Subject: RE: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object reference.
From your loop, you're accessing an array element that doesn't exist. I
would actually advise a different approach to the problem.
Don't use pure arrays within pure arrays (called multidimensional
arrays). I find it very hard to understand and maintain that code. It
can get confusing easily and doesn't easily allow for scalability. I
would have an array store class instances which are just classes with
public properties only (called value objects or VOs). One or more of
those properties of the VO instance can be an array, so you can have
nested logic and data, but you are effectively using an object array
object array structure, where the objects are defined by you, the
class-writer, instead of an array array array structure where you
have to do crazy ways to access the data. By using value object
instances, you are describing the data and structure. By using only
arrays within arrays, and no objects, you have neither structure
definition or data definition.
When you loop through an array, instead of this approach:
var tamanho = p1.length - 1 // o indice comeca com zero entao
tem 1
elemento a menos.
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
Assuming you create an array of class instances, I would recommend this
instead for simplicity's sake because I think the problem is the way you
are looping through the array:
var questionVO1:QuestionVO = new QuestionVO();
questionVO.question = Which fruit is yellow?;
questionVO.answer = Banana;
var questionVO2:QuestionVO = new QuestionVO();
questionVO2.question = What color is the sky?;
questionVO2.answer = Blue;
var myQuestions:Array = [questionVO1, questionVO2];
//So alternatively (not knowing exactly what you wrote your loop for),
as an example, you can
//loop through myQuestions and set all the VO's score property to 0,
like this:
for each (var questionVO:QuestionVO in myQuestions)
{
//set any property of each questionVO here
questionVO.score = 0;
}
//etc. I'd actually store the question information in XML and loop
through that to create these VO instances, but you get the point.
//So to check to see if the answer is right:
if(userResponseTextField1.text == questionVO1.answer)
{
questionVO.score++;
}
I'd actually take a more elegant approach than that for a quiz, but this
just shows you the basic form of how to check for the user's right
response.
Jason Merrill
Instructional Technology Architect
Bank of America Global Learning
Join the Bank of America Flash Platform Community and visit our
Instructional Technology Design Blog
(Note: these resources are only available for Bank of America
associates)
-Original Message-
From: flashcoders-boun...@chattyfig.figleaf.com
[mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Rodrigo
Augusto Guerra
Sent: Thursday, July 01, 2010 10:28 AM
To: 'Flash Coders List'
Subject: Re: [Flashcoders] passing an array as a method = TypeError:
Error#1009: Cannot access a property or method of a null object
reference.
thanks for your reply cor, you are correct, p1 is a parameter for the
constructor (as string) and for the method (as array).
Still, if i change the datatype of data to string the error persists
public function setGabarito(p1:Array) {
var tamanho = p1.length - 1 // o indice comeca com zero entao tem 1
elemento a menos.
var data:String;
//copia os membros do array
for (var r = 0; r = tamanho; r++ ) {
data = p1[r];
//data = hello;
aRespGabarito[r] = data; -any of the declarations above for
data results in an error.
}
}
- Original Message -
