Default_field_options

All,

I have spent the last 6hrs trying to change the default, size=“30”,
that is returned as a result of f.text_field… helper call. I wanted
the default width to be ‘16’ for my application.

I am using Rails 3.0.3 and Ruby 1.8.7.

I have tried the following:

  1. Adding this line in config/environment.rb:

ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS = { “size” =>
16 }

After doing this, the console yields the following:
irb(main):004:0> puts
ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS[“size”]
16
=>nil

additionally, the following line in a partial…
<% ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS[“size”] %>

produces a static ‘16’ in the generated source

However…
The following html source code is rendered in my views:

  1. Next I created a plugin file ‘vender/plugins/default_options/lib/
    default_options.rb’ (also created the requisite ‘init.rb’):

module ActionView
module Helpers
class InstanceTag
DEFAULT_FIELD_OPTIONS = { “size” => 16 }
end
end
end

This modification affects the value stored in
ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS[“size”] but
not the results of f.text_field.

  1. Finally I was able to accomplish the desired results by modifying
    my plugin as follows:

module ActionView
module Helpers
class InstanceTag
DEFAULT_FIELD_OPTIONS = { “size” => 16 }

  def to_input_field_tag(field_type, options = {})
    options = options.stringify_keys
    puts "here"
    options["size"] = options["maxlength"] ||

DEFAULT_FIELD_OPTIONS[“size”] unless options.key?(“size”)
options = DEFAULT_FIELD_OPTIONS.merge(options)
if field_type == “hidden”
options.delete(“size”)
end
options[“type”] ||= field_type
options[“value”] = options.fetch(“value”)
{ value_before_type_cast(object) } unless field_type == “file”
options[“value”] &&= ERB::Util.html_escape(options[“value”])
add_default_name_and_id(options)
tag(“input”, options)
end
end
end
end

Surely I am missing something. What is the ‘one-line’ trick to
setting the default size= option for a text_field?

Thanks

On Feb 5, 8:09pm, jh744 [email protected] wrote:

All,

I have spent the last 6hrs trying to change the default, size=“30”,
that is returned as a result of f.text_field… helper call. I wanted
the default width to be ‘16’ for my application.

This modification affects the value stored in
ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS[“size”] but
not the results of f.text_field.

Looking at the source, it would appear that the existing
DEFAULT_FIELD_OPTIONS is in ActionView::Helpers::InstanceTagMethods
not ActionView::Helpers::InstanceTag (or was the above a typo?)

Fred

Thanks for looking at this Fred. You are correct.
DEFAULT_FIELD_OPTIONS is indeed defined in InstanceTagMethods.
However…

below the module InstanceTagMethods class InstanceTag is defined as
follows:

class InstanceTag
include InstanceTagMethods
end

I actually located it after some searching on google and using the tab-
completion in console to arrive at:
ActionView::Helpers::InstanceTag::DEFAULT

ActionView::Helpers::InstanceTag::DEFAULT_FIELD_OPTIONS
ActionView::Helpers::InstanceTag::DEFAULT_RADIO_OPTIONS
ActionView::Helpers::InstanceTag::DEFAULT_TEXT_AREA_OPTIONS

Redefining
ActionView::Helpers::InstanceTagMethods::DEFAULT_FIELD_OPTIONS in
either environment.rb or in vendor/plugins/default_options/lib/
default_options.rb effects the change that I am looking for but in
both cases I get warning like the following…

work/rails/codata/vendor/plugins/default_options/lib/
default_options.rb:4: warning: already initialized constant
DEFAULT_FIELD_OPTIONS
or
work/rails/codata/config/environment.rb:5: warning: already
initialized constant DEFAULT_FIELD_OPTIONS

If I ‘modify the constant’ as shown in my original post I don’t get
these warnings.

On Feb 5, 5:59pm, Frederick C. [email protected]

On Feb 9, 4:32am, jh744 [email protected] wrote:

work/rails/codata/vendor/plugins/default_options/lib/
default_options.rb:4: warning: already initialized constant
DEFAULT_FIELD_OPTIONS
or
work/rails/codata/config/environment.rb:5: warning: already
initialized constant DEFAULT_FIELD_OPTIONS

If I ‘modify the constant’ as shown in my original post I don’t get
these warnings.

Your original method was just creating some random new constant. Now
you are actually redefining the constant, so you get a warning about
it (There’s a silence_warning method)

Fred

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