I do not know if this case be useful as well
http://web2py.com/plugins/default/multiselect

it would be nice to have a version with same interface but many2many
backend.

Massimo

On Feb 22, 4:46 am, Michael Howden <michael.how...@gmail.com> wrote:
> Hey,
>
> I have a need to allow the user to select multiple countries for a
> single record (in this case the record is a project - which could be
> occurring in a number of different countries).
>
> I've developed a widget which allows the user to select a country from
> a drop down, then click a button which uses JS to add it to a table
> within the widget and also selecting it on a hidden web2py multiple
> widget. The hidden multiple widget ensures that the values are saved
> with the form.
> Similarly, there is a "x" next to each country which has been selected
> and is displayed on the table, which will run some JS to remove it
> from the table, and de-select it on the hidden widget.
>
> This code is working, but I have a few questions:
>
> * Is it fine to presume that all users will be able to use JS on their
> browsers?
> * Is there a better way to do this type of functionality rather than
> using a hidden multiple widget? Could the selected countries be read
> directly from the table? Would it be more efficient to use a hidden
> string widget? Where is the code which gets the values from the table
> and saves them to the DB?
> * Is there any dangers/issues/considerations in using a field with
> multiple = True, rather than using a linking table for many to many
> relationships? Or even using a field with multiple = True for a one to
> many relationship?
>
> Please let me know if it would simplify matters (or somehow
> contribute) if I shared my code (web2pyslice?).
>
> Cheers
>
> Michael

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