Rails - Feb 2007 - How do I get the selected value from a collection_select in the view for an Ajax.Updater call?

I have the classic issue where I have two select boxes, the second''s
contents dependent on the first. I found some same code that works
fairly well using an Ajax.Updater. However, I need to pass in the
selected value of the original select list to the ajax call. I am
trying to use this[this.selectedIndex].value but keep getting a
"undefined local variable or method `this'' for
#<#<Class:0x3143860>:
0x3143838>".

Any ideas? Here''s a my snippet of code from my view.


          collection_select(''product'',
                            ''departments'',
                            @departments,
                            :id, :name,
                            {:prompt => "Select"},
                            html_options                                {
                                   :onChange => "new
Ajax.Updater(''categories_span'',
                                                ''/mgs/
department_changed/''" + this[this.selectedIndex].value + ",
                                                {asynchronous:true,
evalScripts:true});"
                               })
        %>

Thanks,

Scott


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Hello Scott,

2007/2/21, Scott <tamosunas@gmail.com>:
> Any ideas? Here's a my snippet of code from my view.
You're falling into the classic hole of Ruby vs JavaScript code.
>           collection_select('product',
>                             'departments',
>                             @departments,
>                             :id, :name,
>                             {:prompt => "Select"},
>                             html_options >                              
{
>                                    :onChange => "new
> Ajax.Updater('categories_span',
>                                                 '/mgs/
> department_changed/'" + this[this.selectedIndex].value + ",
>                                                 {asynchronous:true,
> evalScripts:true});"
>                                })
>         %>
Your onChange parameter must be a string that will be evaluated
client-side.  The way your wrote it, you are calling this on the Rails
View object, which is the error you are getting.

You must either: escape your quotes, or use the %Q() operator to
enable you to use quotes inside a string, without escaping:


:onChange => %Q(
new Ajax.Updater('categories_span', '/mgs/department_changed/' +
this[this.selectedIndex].value, {asynchronous:true, evalScripts:true)

Hope that helps !
-- 
François Beausoleil
http://blog.teksol.info/
http://piston.rubyforge.org/

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Hi François,

Thanks for getting back to me so quickly.

That sort of worked. When I wrap in the %Q, I get the following in the
source of the rendered page:

    	<select id="product_departments"
name="product[departments]"
onChange="new Ajax.Updater(''categories_span'',
                                                ''/mgs/
department_changed/'' + this[this.selectedIndex].value + ,
                                                {asynchronous:true,
evalScripts:true});">

Unfortunately, the controller is called when the item''s selection is
changed.

If I subsitute the this[this.selectedIndex].value with 4 for example,
just to see if it works, it does in fact update the second select box.

Any other ideas?

Thanks again,

Scott


On Feb 21, 9:11 pm, "François Beausoleil"
<francois.beausol...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hello Scott,
>
> 2007/2/21, Scott <tamosu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>
> > Any ideas? Here''s a my snippet of code from my view.
>
> You''re falling into the classic hole of Ruby vs JavaScript code.
>
> >           collection_select(''product'',
> >                             ''departments'',
> >                             @departments,
> >                             :id, :name,
> >                             {:prompt => "Select"},
> >                             html_options > >                    
{
> >                                    :onChange => "new
> > Ajax.Updater(''categories_span'',
> >                                                 ''/mgs/
> > department_changed/''" + this[this.selectedIndex].value +
",
> >                                                 {asynchronous:true,
> > evalScripts:true});"
> >                                })
> >         %>
>
> Your onChange parameter must be a string that will be evaluated
> client-side.  The way your wrote it, you are calling this on the Rails
> View object, which is the error you are getting.
>
> You must either: escape your quotes, or use the %Q() operator to
> enable you to use quotes inside a string, without escaping:
>
> :onChange => %Q(
> new Ajax.Updater(''categories_span'',
''/mgs/department_changed/'' +
> this[this.selectedIndex].value, {asynchronous:true, evalScripts:true)
>
> Hope that helps !
> --
> François Beausoleilhttp://blog.teksol.info/http://piston.rubyforge.org/

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