Rails spinoffs - Mar 2007 - enumerator Pb ?

Hey there,

Any idea about the following problem ?

The following code for the ExtractDataFromXmlTag constructor works
fine.
oXmlDoc is a XML document (;o) and aTagArray an array of some tags of
this document. There are some
additionnal methods in this class but nevermind.

var ExtractDataFromXmlTag = Class.create();
ExtractDataFromXmlTag.prototype = {
   initialize : function (oXmlDoc, aTagArray) {
       this.xmldoc        = oXmlDoc;
       this.tagArray    = aTagArray;
       this.childArray = {};
       for each (tag in this.tagArray) {
           this.childArray[tag] this.xmldoc.getElementsByTagName(tag);          
};
       return this.childArray;
   },
...
};

The following code don''t works ... it returns error:  
"this.xmldoc
has no properties"
(inside the loop).

var ExtractDataFromXmlTag = Class.create();
ExtractDataFromXmlTag.prototype = {
   initialize : function (oXmlDoc, aTagArray) {
       this.xmldoc        = oXmlDoc;
       this.tagArray    = aTagArray;
       this.childArray = {};
       this.tagArray.each ( function(tag) {
           this.childArray[tag] this.xmldoc.getElementsByTagName(tag);          
});
       return this.childArray;
   },
...
};

I''m pretty sure this is a scope problem but I can''t figure it
out.

Another exemple:

var maxNbChild  = this.tagArray.max (function (tag) { return
this.childArray[tag].length;});

returns "this.childArray has no properties"
Enabling Firebug (in FF 2.0.0.2) I can see that that "this" object has
changed, but I don''t know
if this is  simply a side effect.

Regards

Claude


--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---

Hey there,

claudest2 a écrit :
>        for each (tag in this.tagArray) {
Note that "for each" was introduced in JS 1.6, and is therefore not 
supported on any browser other than FF at this point.  Additionally,
I''m
not sure you even need "each:" this only adds key uniqueness over the 
regular for...in.
> I''m pretty sure this is a scope problem but I can''t
figure it out.
Yeah: you need to bind your anonymous function to "this" for it to
know
the proper "this" reference:

   this.tagArray.each((function(tag) {
      ...
   }).bind(this));

On another note, naming a hash "tagArray" sounds misleading to me.

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Spinoffs" group.
To post to this group, send email to
rubyonrails-spinoffs-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-spinoffs-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-spinoffs?hl=en
-~----------~----~----~----~------~----~------~--~---