Rails - Jul 2007 - How to conditionally replace an element using RJS template

I have an RJS template that looks like this:

page.replace "id_#{@foo.id}", :partial => "row"

But I only want it to execute if "id_#{@foo.id}" is an element on the
current page?

something like:

if page.exists?("id_#{@foo.id}")
  page.replace "id_#{@foo.id}", :partial => "row"
end

I have read through every API page that I can find and can''t find such
a beast?  What would be the best way to do this?

Thanks

Mikel


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not sure, but try this:

page << "if $(''id_#{@foo.id}'') {"
page.replace "id_#{@foo.id}", :partial => "row"
page << "}"

you can feed straight Javascripts into the page object with << (as
documented in the API), so i think it *should* work

On 1 Jul., 09:22, Mikel <raasdnil-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I have an RJS template that looks like this:
>
> page.replace "id_#{@foo.id}", :partial => "row"
>
> But I only want it to execute if "id_#{@foo.id}" is an element on
the
> current page?
>
> something like:
>
> if page.exists?("id_#{@foo.id}")
>   page.replace "id_#{@foo.id}", :partial => "row"
> end
>
> I have read through every API page that I can find and can''t find
such
> a beast?  What would be the best way to do this?
>
> Thanks
>
> Mikel

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Thanks for the pointer!

You were almost there, the solution was:

  page << "elem = $(''id_(#{@foo}'');"
  page << "if (elem) {"
    page.replace "id_(#{@foo}", :partial => "row"
  page << "}"

Needed the extra step.

Thanks :)

Mikel


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On 7/1/07, Mikel <raasdnil-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>
> Thanks for the pointer!
>
> You were almost there, the solution was:
>
>   page << "elem = $(''id_(#{@foo}'');"
>   page << "if (elem) {"
>     page.replace "id_(#{@foo}", :partial => "row"
>   page << "}"
>
> Needed the extra step.
>
> Thanks :)
>
> Mikel

You shouldn''t need an extra step.  Just some brackets.

page << "if( $(''id_#{@foo.id
<id_#%7B-sW51h6flRGM@public.gmane.org>}'') ){"
page.replace "id_#{@foo.id
<id_#%7B-sW51h6flRGM@public.gmane.org>}", :partial =>
"row"
page << "}"

That should be the equivalent of what you had.

Daniel

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