I would do it in javascript in the view and simulate radio buttons, which 
means that every time the user is selecting a checkbox the script will 
clear the former selected checkbox. This way you don't have to deal with 
informing the user, about multiple selections.

On Friday, March 8, 2019 at 9:07:55 PM UTC+1, João Matos wrote:
>
> The problem is that my origin page has a grid with extra buttons, using 
> the selectable option.
> And that option does not allow using _target or anything similar. It can 
> only call a function (which is the function on the 1st message).
> That function checks if there is only 1 record selected in the grid and if 
> so calls the button action (add, edit, ...)
> What I would like is for this action to open a new page.
>
> Do you see some solution?
>
> sexta-feira, 8 de Março de 2019 às 19:39:06 UTC, Leonel Câmara escreveu:
>>
>> It's sort of possible using response.js = "window.open(url, '_blank')" 
>> however any modern browser will consider this a popup and block it because 
>> it's a window.open that's not coming as a direct result of a click, you can 
>> then move a step forward fighting with the user's browser preferences and 
>> instead of using window.open you send javascript that creates an A element 
>> and clicks it, or even a form that submits to another page.  
>>   
>> Don't do this, it won't work reliably. Depending on what you're trying to 
>> do a good alternative can be to use a modal, or putting a _target="_blank" 
>> in your form so it submits to a new window.
>>
>

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