Rails 3.1 text_field form helper and jQuery datepicker date format

问题

I have a form field in my Rails view like this:

<%= f.text_field :date, :class => "datepicker" %>

A javascript function converts all input fields of that class to a jQueryUI datepicker.

$(".datepicker").datepicker({
                dateFormat : "dd MM yy",
                buttonImageOnly : true,
                buttonImage : "<%= asset_path('iconDatePicker.gif') %>",
                showOn : "both",
                changeMonth : true,
                changeYear : true,
                yearRange : "c-20:c+5"
            })

So far so good. I can edit the record and it persists the date correctly all the way to the DB. My problem is when I want to edit the record again. When the form is pre-populated from the record it displays in 'yyyy-mm-dd' format. The javascript only formats dates which are selected in the datepicker control. Is there any way I can format the date retrieved from the database? At which stage can I do this?

Thanks, Dany.

Some more details following the discussion below, my form is spread across two files, a view and a partial. Here's the view:

<%= form_tag("/shows/update_individual", :method => "put") do %>
    <% for show in @shows %>
        <%= fields_for "shows[]", show do |f| %>
            <%= render "fields", :f => f %>
        <% end %>
    <% end %>
    <%= submit_tag "Submit"%>
<% end %>

And here's the _fields partial view:

<p>
    <%= f.label :name %>
    <%= f.text_field :name %>
</p>

<p>
    <%= f.date %>
    <%= f.label :date %>
    <%= f.text_field :date, :class => "datepicker" %>
</p>

Controller code:

def edit_individual
    @shows = Show.find(params[:show_ids])
  end

I have added the following in environment.rb:

Date::DATE_FORMATS.merge!(
  :default => "%d %B %Y"
)

Now it's displaying the right format when I use @show.date in the view, but the form helper is still displaying the raw format.

回答1:

JQuery datepicker won't format the pre-populated date.
You would need to handle it on the rails side by using the formatted date with the textfield, instead of the raw date which has the default 'yyyy-mm-dd' format.

Example -

<%= f.text_field :date, :class => "datepicker", :value => @model.date.strftime("%d %m %Y") %>

More examples @ Rails date format in a text_field

回答2:

SOLVED: I pass in the :value => show.date as suggested by Jayendra above. The reason it wasn't working was because I didn't pass in the show object from the parent view. I changed the render line to include it - the parent view now looks like this:

<%= form_tag("/shows/update_individual", :method => "put") do %>
    <% for show in @shows %>
        <%= fields_for "shows[]", show do |f| %>
            <%= render "fields", :f => f, :show => show %>
        <% end %>
    <% end %>
    <%= submit_tag "Submit"%>
<% end %>

回答3:

What I ended up doing is to just create a normal text input and prepopulate it with an ISO formatted date and additional information to mark it as a date input (say, rel="date").

On the client side, I have JavaScript to create a new hidden input that takes on the name of the original field (thus overriding it, for good measure I also delete the name property of the original). The datepicker is attached to the original field, and uses altField/altFormat to sync the hidden field with an ISO date.

// used in jQuery's .each
function create_datepicker_for(_, el) {
  var e = $(el),
      mirror,
      date;

  // attach a hidden field that mirrors the proper date
  mirror = $('<input type="hidden"></input>')
           .prop('name', e.prop('name'))
           .insertAfter(e);

  if (e.val()) { date = new Date(e.val()); }

  e
  .prop('name', '')       /* make sure this is not sent to the application */
  .datepicker({
    altField: mirror,     /* "mirror" is the hidden field */
    altFormat: 'yy-mm-dd' /* you do not want anything but ISO */
  });

  if (date) { e.datepicker('setDate', date) }
}

This appears to keep everything in sync, sends the proper date format to the application, and degrades as well as anyone would expect it to.

回答4:

if your are using mysql database you can format the date in query itself.

Sample code

     date_format(date_field,"%d %m %y")

来源：https://stackoverflow.com/questions/8103323/rails-3-1-text-field-form-helper-and-jquery-datepicker-date-format