[Facebooker-talk] facebook_form_for + a little ajax?

[Zhao Lu]

That's exactly what I was looking for.  Thanks so much!

On Thu, Sep 11, 2008 at 3:20 PM, Mike Mangino
<mmangino at elevatedrails.com> wrote:
> You'll actually have to store it in a javascript variable. You can do
> something like:
>
> In your controller:
>
> @gift_image_hash = {}
> GiftCatalog.find(:all).each {|g| @gift_image_hash[g.id] =
> g.resource.resource_url}
>
> In your view:
>
> <script>
>  var gift_mapping = <%= @gift_image_hash.to_json %>;
> </script>
>
>
> Then, your function can just be:
> function update_gift_display(gc_id, update_widget) {
>  $(update_widget).setTextValue(gift_mapping[gc_id]);
> }
>
> You'll probably need to adjust the setTextValue call to something else if
> you want to change an image src, but that's the general idea.
>
> Mike
>
> On Sep 11, 2008, at 5:47 PM, Zhao Lu wrote:
>
>> Yep I was mixing them without thinking about it!  I guess I'm getting
>> confused reading on Prototype/Facebooker all at once.  I think I can
>> go either way, AJax or store it somewhere.  It sounds storing it in an
>> array as you have suggested is easier.  But I'll have to store it in a
>> ruby variable and I have to access to it (or at least I don't know how
>> to access it) from Javascript.
>>
>> In case I'm not being articulate enough, this is what I mean:
>> I create this array in my form:
>> @rs_array = GiftCatalog.find(:all, :order => "name").map { |gc|
>> [gc.resource.resource_uri, gc.id]}
>>
>> Then in my javascript function I pass in gc.id, cause that's what's
>> being selected in the drop-down.
>> Now how do you get the resource_uri that's corresponding to the gc.id
>> of @rs_array?
>>
>> Zhao
>>
>> On Thu, Sep 11, 2008 at 2:13 PM, Mike Mangino
>> <mmangino at elevatedrails.com> wrote:
>>>
>>> I think you're mixing javascript and ruby:
>>>
>>> uri = GiftCatalog.find(gc_id).resource.resource_uri
>>>
>>> That's Ruby, right?
>>>
>>> You'll need to either use ajax to get that data or store it in the page
>>> somewhere. Maybe you could keep an array that maps between gc_id values
>>> and
>>> their URLs.
>>>
>>> I often will prototype my ajax stuff outside of Facebook. It's easier to
>>> debug that way. Once it's working I convert it to Facebook.
>>>
>>> Mike
>>> On Sep 11, 2008, at 3:06 PM, Zhao Lu wrote:
>>>
>>>> Thanks for your answer Mike.  I was calling select_tag by itself
>>>> without the wrapping,
>>>> which is indeed what I need to do.  Now I have passed that having some
>>>> problem with
>>>> getting hold of a ruby class I defined from javascript.  I can't seem
>>>> to find an example
>>>> online.  Here's my code:
>>>>
>>>> <p id="resource" >&nbsp;</p>
>>>> <% facebook_form_for :facebook_gift, FacebookGift.new, :url =>
>>>> facebook_gifts_path do |f| %>
>>>> <%=
>>>> @gift_catalog = GiftCatalog.find(:all, :order => "name").map { |gc|
>>>> [gc.resource.file_name, gc.id]}
>>>> f.text select_tag(:gift_catalog_id,
>>>> options_for_select(@gift_catalog), :onchange =>
>>>> "update_gift_display(this.getValue(), 'resource');")
>>>> %>
>>>> //more code here
>>>> <%end%>
>>>>
>>>> I have some javascript on the same page:
>>>>
>>>> <script>
>>>> function update_gift_display(gc_id, update_widget) {
>>>>  uri = GiftCatalog.find(gc_id).resource.resource_uri
>>>>  $(update_widget).setTextValue(uri)
>>>> }
>>>> </script>
>>>>
>>>> So what I'm trying to achieve is for user to select a gift_catalog_id,
>>>> then I will get the url to
>>>> the actual gift (which is linked to gift_catalog).  But GiftCatalog is
>>>> not available in the javascript function.
>>>> I feel that I'm not on the right track for this.  Any suggestion would
>>>> be greatly appreciated.
>>>>
>>>> Zhao
>>>>
>>>> On Thu, Sep 11, 2008 at 5:30 AM, Mike Mangino
>>>> <mmangino at elevatedrails.com> wrote:
>>>>>
>>>>> Are you calling form.select_tag? That won't work. select_tag is not a
>>>>> method
>>>>> on the form builder (this is true any time you use form_for in rails)
>>>>>
>>>>> You can do form.text select_tag... to wrap a normal select inside a
>>>>> facebook
>>>>> form.
>>>>>
>>>>> Mike
>>>>> On Sep 11, 2008, at 1:45 AM, Zhao Lu wrote:
>>>>>
>>>>>> Hello Everyone,
>>>>>>
>>>>>> I'm using a facebook_form_for which is bound to a model.  In the form
>>>>>> I have a form.select which is populated with an array of the names of
>>>>>> images.
>>>>>> Whenever I change the selection I'd like to display the image on the
>>>>>> same page.  I tried to change form.select to select_tag but that
>>>>>> doesn't seem to play well with facebook_form_for.  I'm pretty confused
>>>>>> as to how to approach this.  Any suggestion would be appreciated.
>>>>>>
>>>>>> --
>>>>>> Zhao
>>>>>> _______________________________________________
>>>>>> Facebooker-talk mailing list
>>>>>> Facebooker-talk at rubyforge.org
>>>>>> http://rubyforge.org/mailman/listinfo/facebooker-talk
>>>>>
>>>>> --
>>>>> Mike Mangino
>>>>> http://www.elevatedrails.com
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Zhao
>>>
>>> --
>>> Mike Mangino
>>> http://www.elevatedrails.com
>>>
>>>
>>>
>>>
>>
>>
>>
>> --
>> Zhao
>
> --
> Mike Mangino
> http://www.elevatedrails.com
>
>
>
>



-- 
Zhao