I do not understand how I have to interpret this code

I have problems in understanding this code. It is from the WAExampleBrowser. I added an additional instance variable b to this class and changed the following methods.

initialize
   super initialize.
   self class: self allClasses first.
   b := 5.

renderChooserOn: html
   b := 12.
   html div class: 'chooser'; with: [
      html form: [
         html div: [
            html select
               selected: class;
               list: self allClasses;
               onChange: 'submit()';
               callback: [ :value | self halt. self class: value ] ] ].
      self allSelectors size > 1 ifTrue: [
         html form: [
            html div: [
               html select
                  selected: selector;
                  list: self allSelectors;
                  onChange: 'submit()';
                  callback: [ :value | self selector: value ] ] ] ] ]

The question is: What is the value of instance variable "b" of the receiver at the location of "self halt".

The answer is: 5 - but why !? what state of the instance do I see in the callback ?

I know that the Seaside book tells one: "Your rendering method is just for painting the current state of your component, it shouldn't be concerned with changing that state".

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Backtracking? Try to delete the #states method from the class to see
if it makes any difference.

rado

On Thu, Nov 25, 2010 at 9:45 PM, Marten Feldtmann
[hidden email] wrote:

I have problems in understanding this code. It is from the WAExampleBrowser.
I added an additional instance variable b to this class and changed the
following methods.

initialize
   super initialize.
   self class: self allClasses first.
   b := 5.

renderChooserOn: html
   b := 12.
   html div class: 'chooser'; with: [
      html form: [
         html div: [
            html select
               selected: class;
               list: self allClasses;
               onChange: 'submit()';
               callback: [ :value | self halt. self class: value ] ] ].
      self allSelectors size > 1 ifTrue: [
         html form: [
            html div: [
               html select
                  selected: selector;
                  list: self allSelectors;
                  onChange: 'submit()';
                  callback: [ :value | self selector: value ] ] ] ] ]

The question is: What is the value of instance variable "b" of the receiver
at the location of "self halt".

The answer is: 5 - but why !? what state of the instance do I see in the
callback ?

I know that the Seaside book tells one: "Your rendering method is just for
painting the current state of your component, it shouldn't be concerned with
changing that state".



_______________________________________________
seaside mailing list
[hidden email]
http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside

_______________________________________________
seaside mailing list
[hidden email]
http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside