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[EP-tech] Re: Rendering a metafield - use different format in Listing and Abstract page

I've solved this problem by using a virtual field with a custom renderer.  The virtual field's render method reads the value from the actual field you're interested in and renders it differently.  The problem with virtual fields is that I think they're hard to test for in epxml (and possibly also with is_set).

You can see an example from the tweepository package here:

	https://github.com/gobfrey/tweepository/blob/master/cfg/cfg.d/z_tweepository_libs.pl#L314 <https://github.com/gobfrey/tweepository/blob/master/cfg/cfg.d/z_tweepository_libs.pl#L314> (field definition)
	https://github.com/gobfrey/tweepository/blob/master/cfg/cfg.d/z_tweepository_libs.pl#L1710 <https://github.com/gobfrey/tweepository/blob/master/cfg/cfg.d/z_tweepository_libs.pl#L1710> (render method)

Adam Field
Business Relationship Manager and Community Lead
EPrints Services

> On 17 Jun 2015, at 17:47, John Salter <J.Salter at leeds.ac.uk> wrote:
> Hi,
> I'd like to be able to apply a different rendering to a field if it's being displayed in a listing (e.g. the Review screen) to how it gets rendered 'normally'.
> In this specific case, a compound field is normally rendered as a table:
> +----------+----------+
> | Sub A    | Sub B    |
> +----------+----------+
> | Val 1A   | Val 1B   |
> | Val 2A   | Val 2B   |
> | Val 3A   | Val 3B   |
> +----------+----------+
> This rendering is OK on an abstract page, but when using the compound field as a review column, I want to render is as a list:
> * Val 1B (Val 1A)
> * Val 2B (Val 2A)
> * Val 3B (Val 3A)
> Is there a way (in the render_value of a field) to determine if the field is being rendered as part of a listing?
> I've got access to the $session - so was thinking along the lines of (CAUTION: nonsense code!)
> if( $session->{screen}->isa( "EPrints::Screen::Listing" ) ){
> 	#do list rendering
> } else {
> 	#revert to normal table rendering
> }
> but I can't quite get my head around going from session to screen. Any pointers welcome!
> I may be missing something obvious too - e.g. if there's a citation style that I should use to do this!
> Cheers,
> John
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