Rails collection_select default select -



Rails collection_select default select -

in rails 4 in view have

<%= form_for @person |f| %> <%= f.collection_select :country_id, country.order(:name), :id, :name, include_blank: "select country" %> ... <% end %>

i'd "select country" selected default whenever page loaded. 1 way utilize javascript (select after dom loaded). there easier way adding alternative collection_select?

thanks.

as per the docs, it's prompt alternative in options argument:

collection_select(:post, :author_id, author.find(:all), :id, :name_with_initial, {:prompt => 'please select author of post'})

with collection_select on form builder omit first argument, in case:

f.collection_select :country_id, country.order(:name), :id, :name, {prompt: 'select country'}

i've 100% confirmed working on own app running rails 4.1.6, prompt , include_blank same thing.

the way works rails injects null-valued <option> first item in generated <select> (this because html spec has nil analogous placeholder on text inputs select inputs).

reasons may fail:

rails not mark prompt alternative selected attribute, , suspect browsers may take render own blank entry instead of first in list if, existing records, rails determines current record's country_id matches element in list mark 1 selected. expected behaviour can pain if you're doing non-standard.

if you're beingness bitten these problems options build form manually (the method options_from_collection_for_select may of utilize here) or in javascript. there undocumented default attribute can add together <option> tag it's not in spec , browser back upwards may patchy, , you'd still have build form manually.

ruby-on-rails select selected collection-select

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