aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_view/helpers/form_helper.rb
blob: 95132d130b35468f14ceb9a7b57cd6d00b337571 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
require 'cgi'
require File.dirname(__FILE__) + '/date_helper'
require File.dirname(__FILE__) + '/tag_helper'

module ActionView
  module Helpers
    # Provides a set of methods for working with forms and especially forms related to objects assigned to the template.
    # The following is an example of a complete form for a person object that works for both creates and updates built
    # with all the form helpers. The <tt>@person</tt> object was assigned by an action on the controller:
    #   <form action="save_person" method="post">
    #     Name:
    #     <%= text_field "person", "name", "size" => 20 %>
    #
    #     Password:
    #     <%= password_field "person", "password", "maxsize" => 20 %>
    #
    #     Single?:
    #     <%= check_box "person", "single" %>
    #
    #     Description:
    #     <%= text_area "person", "description", "cols" => 20 %>
    #
    #     <input type="submit" value="Save">
    #   </form>
    #
    # ...is compiled to:
    #
    #   <form action="save_person" method="post">
    #     Name:
    #     <input type="text" id="person_name" name="person[name]"
    #       size="20" value="<%= @person.name %>" />
    #
    #     Password:
    #     <input type="password" id="person_password" name="person[password]"
    #       size="20" maxsize="20" value="<%= @person.password %>" />
    #
    #     Single?:
    #     <input type="checkbox" id="person_single" name="person[single]" value="1" />
    #
    #     Description:
    #     <textarea cols="20" rows="40" id="person_description" name="person[description]">
    #       <%= @person.description %>
    #     </textarea>
    #
    #     <input type="submit" value="Save">
    #   </form>
    #
    # If the object name contains square brackets the id for the object will be inserted. Example:
    #
    #   <%= textfield "person[]", "name" %> 
    # 
    # ...becomes:
    #
    #   <input type="text" id="person_<%= @person.id %>_name" name="person[<%= @person.id %>][name]" value="<%= @person.name %>" />
    #
    # If the helper is being used to generate a repetitive sequence of similar form elements, for example in a partial
    # used by render_collection_of_partials, the "index" option may come in handy. Example:
    #
    #   <%= text_field "person", "name", "index" => 1 %>
    #
    # becomes
    #
    #   <input type="text" id="person_1_name" name="person[1][name]" value="<%= @person.name %>" />
    #
    # There's also methods for helping to build form tags in link:classes/ActionView/Helpers/FormOptionsHelper.html,
    # link:classes/ActionView/Helpers/DateHelper.html, and link:classes/ActionView/Helpers/ActiveRecordHelper.html
    module FormHelper
      # Returns an input tag of the "text" type tailored for accessing a specified attribute (identified by +method+) on an object
      # assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
      # hash with +options+.
      #
      # Examples (call, result):
      #   text_field("post", "title", "size" => 20)
      #     <input type="text" id="post_title" name="post[title]" size="20" value="#{@post.title}" />
      def text_field(object, method, options = {})
        InstanceTag.new(object, method, self).to_input_field_tag("text", options)
      end

      # Works just like text_field, but returns an input tag of the "password" type instead.
      def password_field(object, method, options = {})
        InstanceTag.new(object, method, self).to_input_field_tag("password", options)
      end

      # Works just like text_field, but returns an input tag of the "hidden" type instead.
      def hidden_field(object, method, options = {})
        InstanceTag.new(object, method, self).to_input_field_tag("hidden", options)
      end

      # Works just like text_field, but returns an input tag of the "file" type instead, which won't have a default value.
      def file_field(object, method, options = {})
        InstanceTag.new(object, method, self).to_input_field_tag("file", options)
      end

      # Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified by +method+)
      # on an object assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
      # hash with +options+.
      #
      # Example (call, result):
      #   text_area("post", "body", "cols" => 20, "rows" => 40)
      #     <textarea cols="20" rows="40" id="post_body" name="post[body]">
      #       #{@post.body}
      #     </textarea>
      def text_area(object, method, options = {})
        InstanceTag.new(object, method, self).to_text_area_tag(options)
      end

      # Returns a checkbox tag tailored for accessing a specified attribute (identified by +method+) on an object
      # assigned to the template (identified by +object+). It's intended that +method+ returns an integer and if that
      # integer is above zero, then the checkbox is checked. Additional options on the input tag can be passed as a
      # hash with +options+. The +checked_value+ defaults to 1 while the default +unchecked_value+
      # is set to 0 which is convenient for boolean values. Usually unchecked checkboxes don't post anything.
      # We work around this problem by adding a hidden value with the same name as the checkbox.
      #
      # Example (call, result). Imagine that @post.validated? returns 1:
      #   check_box("post", "validated")
      #     <input type="checkbox" id="post_validate" name="post[validated]" value="1" checked="checked" />
      #     <input name="post[validated]" type="hidden" value="0" />
      #
      # Example (call, result). Imagine that @puppy.gooddog returns no:
      #   check_box("puppy", "gooddog", {}, "yes", "no")
      #     <input type="checkbox" id="puppy_gooddog" name="puppy[gooddog]" value="yes" />
      #     <input name="puppy[gooddog]" type="hidden" value="no" />
      def check_box(object, method, options = {}, checked_value = "1", unchecked_value = "0")
        InstanceTag.new(object, method, self).to_check_box_tag(options, checked_value, unchecked_value)
      end

      # Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object
      # assigned to the template (identified by +object+). If the current value of +method+ is +tag_value+ the
      # radio button will be checked. Additional options on the input tag can be passed as a
      # hash with +options+.
      # Example (call, result). Imagine that @post.category returns "rails":
      #   radio_button("post", "category", "rails")
      #   radio_button("post", "category", "java")
      #     <input type="radio" id="post_category" name="post[category]" value="rails" checked="checked" />
      #     <input type="radio" id="post_category" name="post[category]" value="java" />
      #
      def radio_button(object, method, tag_value, options = {})
        InstanceTag.new(object, method, self).to_radio_button_tag(tag_value, options)
      end
    end

    class InstanceTag #:nodoc:
      include Helpers::TagHelper

      attr_reader :method_name, :object_name

      DEFAULT_FIELD_OPTIONS     = { "size" => 30 }.freeze unless const_defined?(:DEFAULT_FIELD_OPTIONS)
      DEFAULT_RADIO_OPTIONS     = { }.freeze unless const_defined?(:DEFAULT_RADIO_OPTIONS)
      DEFAULT_TEXT_AREA_OPTIONS = { "cols" => 40, "rows" => 20 }.freeze unless const_defined?(:DEFAULT_TEXT_AREA_OPTIONS)
      DEFAULT_DATE_OPTIONS = { :discard_type => true }.freeze unless const_defined?(:DEFAULT_DATE_OPTIONS)

      def initialize(object_name, method_name, template_object, local_binding = nil)
        @object_name, @method_name = object_name.to_s, method_name.to_s
        @template_object, @local_binding = template_object, local_binding
        if @object_name.sub!(/\[\]$/,"")
          @auto_index = @template_object.instance_variable_get("@#{Regexp.last_match.pre_match}").id_before_type_cast
        end
      end

      def to_input_field_tag(field_type, options = {})
        options = options.stringify_keys
        options["size"] ||= options["maxlength"] || DEFAULT_FIELD_OPTIONS["size"]
        options = DEFAULT_FIELD_OPTIONS.merge(options)
        if field_type == "hidden"
          options.delete("size")
        end
        options["type"] = field_type
        options["value"] ||= value_before_type_cast unless field_type == "file"
        add_default_name_and_id(options)
        tag("input", options)
      end

      def to_radio_button_tag(tag_value, options = {})
        options = DEFAULT_RADIO_OPTIONS.merge(options.stringify_keys)
        options["type"]     = "radio"
        options["value"]    = tag_value
        options["checked"]  = "checked" if value == tag_value
        pretty_tag_value    = tag_value.to_s.gsub(/\s/, "_").gsub(/\W/, "").downcase
        options["id"]       = @auto_index ?             
          "#{@object_name}_#{@auto_index}_#{@method_name}_#{pretty_tag_value}" :
          "#{@object_name}_#{@method_name}_#{pretty_tag_value}"
        add_default_name_and_id(options)
        tag("input", options)
      end

      def to_text_area_tag(options = {})
        options = DEFAULT_TEXT_AREA_OPTIONS.merge(options.stringify_keys)
        add_default_name_and_id(options)
        content_tag("textarea", html_escape(value_before_type_cast), options)
      end

      def to_check_box_tag(options = {}, checked_value = "1", unchecked_value = "0")
        options = options.stringify_keys
        options["type"]     = "checkbox"
        options["value"]    = checked_value
        checked = case value
          when TrueClass, FalseClass
            value
          when NilClass
            false
          when Integer
            value != 0
          when String
            value == checked_value
          else
            value.to_i != 0
          end
        if checked || options["checked"] == "checked"
          options["checked"] = "checked"
        else
          options.delete("checked")
        end
        add_default_name_and_id(options)
        tag("input", options) << tag("input", "name" => options["name"], "type" => "hidden", "value" => unchecked_value)
      end

      def to_date_tag()
        defaults = DEFAULT_DATE_OPTIONS.dup
        date     = value || Date.today
        options  = Proc.new { |position| defaults.merge(:prefix => "#{@object_name}[#{@method_name}(#{position}i)]") }
        html_day_select(date, options.call(3)) +
        html_month_select(date, options.call(2)) +
        html_year_select(date, options.call(1))
      end

      def to_boolean_select_tag(options = {})
        options = options.stringify_keys
        add_default_name_and_id(options)
        tag_text = "<select"
        tag_text << tag_options(options)
        tag_text << "><option value=\"false\""
        tag_text << " selected" if value == false
        tag_text << ">False</option><option value=\"true\""
        tag_text << " selected" if value
        tag_text << ">True</option></select>"
      end
      
      def to_content_tag(tag_name, options = {})
        content_tag(tag_name, value, options)
      end
      
      def object
        @template_object.instance_variable_get "@#{@object_name}"
      end

      def value
        object.send(@method_name) unless object.nil?
      end

      def value_before_type_cast
        unless object.nil?
          object.respond_to?(@method_name + "_before_type_cast") ?
            object.send(@method_name + "_before_type_cast") :
            object.send(@method_name)
        end
      end

      private
        def add_default_name_and_id(options)
          if options.has_key?("index")
            options["name"] ||= tag_name_with_index(options["index"])
            options["id"]   ||= tag_id_with_index(options["index"])
            options.delete("index")
          elsif @auto_index
            options["name"] ||= tag_name_with_index(@auto_index)
            options["id"]   ||= tag_id_with_index(@auto_index)
          else
            options["name"] ||= tag_name
            options["id"]   ||= tag_id
          end
        end

        def tag_name
          "#{@object_name}[#{@method_name}]"
        end

        def tag_name_with_index(index)
          "#{@object_name}[#{index}][#{@method_name}]"
        end

        def tag_id
          "#{@object_name}_#{@method_name}"
        end

        def tag_id_with_index(index)
          "#{@object_name}_#{index}_#{@method_name}"
        end
    end
  end
end