Class: Mechanize::Form
- Inherits:
-
Object
- Object
- Mechanize::Form
- Extended by:
- ElementMatcher
- Defined in:
- lib/mechanize/form.rb
Overview
This class encapsulates a form parsed out of an HTML page. Each type of input field available in a form can be accessed through this object.
Examples
Find a form and print out its fields
form = page.forms.first # => Mechanize::Form
form.fields.each { |f| puts f.name }
Set the input field ‘name’ to “Aaron”
form['name'] = 'Aaron'
puts form['name']
Defined Under Namespace
Classes: Button, CheckBox, Field, FileUpload, Hidden, ImageButton, Keygen, MultiSelectList, Option, RadioButton, Reset, SelectList, Submit, Text, Textarea
Instance Attribute Summary collapse
-
#action ⇒ Object
Returns the value of attribute action.
-
#buttons ⇒ Object
readonly
Returns the value of attribute buttons.
-
#checkboxes ⇒ Object
readonly
Returns the value of attribute checkboxes.
-
#encoding ⇒ Object
Character encoding of form data (i.e. UTF-8).
-
#enctype ⇒ Object
Content-Type for form data (i.e. application/x-www-form-urlencoded).
-
#fields ⇒ Object
(also: #elements)
readonly
Returns the value of attribute fields.
-
#file_uploads ⇒ Object
readonly
Returns the value of attribute file_uploads.
-
#form_node ⇒ Object
readonly
Returns the value of attribute form_node.
-
#ignore_encoding_error ⇒ Object
When true, character encoding errors will never be never raised on form submission.
-
#method ⇒ Object
Returns the value of attribute method.
-
#name ⇒ Object
Returns the value of attribute name.
-
#page ⇒ Object
readonly
Returns the value of attribute page.
-
#radiobuttons ⇒ Object
readonly
Returns the value of attribute radiobuttons.
Instance Method Summary collapse
-
#[](field_name) ⇒ Object
Fetch the value of the first input field with the name passed in.
-
#[]=(field_name, value) ⇒ Object
Set the value of the first input field with the name passed in.
-
#add_button_to_query(button) ⇒ Object
This method adds a button to the query.
-
#add_field!(field_name, value = nil) ⇒ Object
Add a field with
field_name
andvalue
. -
#build_query(buttons = []) ⇒ Object
This method builds an array of arrays that represent the query parameters to be used with this form.
-
#button ⇒ Object
:method: buttons_with(criteria).
-
#checkbox ⇒ Object
:method: checkboxes_with(criteria).
-
#click_button(button = buttons.first) ⇒ Object
Submit form using
button
. -
#delete_field!(field_name) ⇒ Object
Removes all fields with name
field_name
. -
#dom_class ⇒ Object
This method is a shortcut to get form’s DOM class.
-
#dom_id ⇒ Object
This method is a shortcut to get form’s DOM id.
-
#field ⇒ Object
:method: fields_with(criteria).
-
#file_upload ⇒ Object
:method: file_uploads_with(criteria).
-
#has_field?(field_name) ⇒ Boolean
(also: #has_key?)
Returns whether or not the form contains a field with
field_name
. -
#has_value?(value) ⇒ Boolean
Returns whether or not the form contains a field with
value
. -
#hidden_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Hidden field named
field_name
. -
#hiddens ⇒ Object
Returns all fields of type Hidden.
-
#initialize(node, mech = nil, page = nil) ⇒ Form
constructor
A new instance of Form.
-
#keygens ⇒ Object
Returns all fields of type Keygen.
-
#keys ⇒ Object
Returns all field names (keys) for this form.
-
#method_missing(meth, *args) ⇒ Object
Treat form fields like accessors.
-
#pretty_print(q) ⇒ Object
:nodoc:.
-
#radiobutton ⇒ Object
:method: radiobuttons_with(criteria).
-
#request_data ⇒ Object
This method calculates the request data to be sent back to the server for this form, depending on if this is a regular post, get, or a multi-part post,.
-
#reset ⇒ Object
This method allows the same form to be submitted second time with the different submit button being clicked.
-
#reset_button?(button_name) ⇒ Boolean
Returns whether or not the form contains a Reset button named
button_name
. -
#resets ⇒ Object
Returns all buttons of type Reset.
-
#save_hash_field_order ⇒ Object
This method adds an index to all fields that have Hash nodes.
-
#set_fields(fields = {}) ⇒ Object
This method sets multiple fields on the form.
-
#submit(button = nil, headers = {}) ⇒ Object
Submit the form.
-
#submit_button?(button_name) ⇒ Boolean
Returns whether or not the form contains a Submit button named
button_name
. -
#submits ⇒ Object
Returns all buttons of type Submit.
-
#text_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Text field named
field_name
. -
#textarea_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Textarea named
field_name
. -
#textareas ⇒ Object
Returns all fields of type Textarea.
-
#texts ⇒ Object
Returns all fields of type Text.
-
#values ⇒ Object
Returns all field values for this form.
Methods included from ElementMatcher
Constructor Details
#initialize(node, mech = nil, page = nil) ⇒ Form
Returns a new instance of Form.
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# File 'lib/mechanize/form.rb', line 41 def initialize(node, mech = nil, page = nil) @enctype = node['enctype'] || 'application/x-www-form-urlencoded' @form_node = node @action = Mechanize::Util.html_unescape(node['action']) @method = (node['method'] || 'GET').upcase @name = node['name'] @clicked_buttons = [] @page = page @mech = mech @encoding = node['accept-charset'] || (page && page.encoding) || nil @ignore_encoding_error = false parse end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(meth, *args) ⇒ Object
Treat form fields like accessors.
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# File 'lib/mechanize/form.rb', line 209 def method_missing(meth, *args) method = meth.to_s.gsub(/=$/, '') if field(method) return field(method).value if args.empty? return field(method).value = args[0] end super end |
Instance Attribute Details
#action ⇒ Object
Returns the value of attribute action.
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# File 'lib/mechanize/form.rb', line 22 def action @action end |
#buttons ⇒ Object (readonly)
Returns the value of attribute buttons.
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# File 'lib/mechanize/form.rb', line 24 def @buttons end |
#checkboxes ⇒ Object (readonly)
Returns the value of attribute checkboxes.
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# File 'lib/mechanize/form.rb', line 24 def checkboxes @checkboxes end |
#encoding ⇒ Object
Character encoding of form data (i.e. UTF-8)
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# File 'lib/mechanize/form.rb', line 30 def encoding @encoding end |
#enctype ⇒ Object
Content-Type for form data (i.e. application/x-www-form-urlencoded)
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# File 'lib/mechanize/form.rb', line 27 def enctype @enctype end |
#fields ⇒ Object (readonly) Also known as: elements
Returns the value of attribute fields.
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# File 'lib/mechanize/form.rb', line 24 def fields @fields end |
#file_uploads ⇒ Object (readonly)
Returns the value of attribute file_uploads.
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# File 'lib/mechanize/form.rb', line 24 def file_uploads @file_uploads end |
#form_node ⇒ Object (readonly)
Returns the value of attribute form_node.
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# File 'lib/mechanize/form.rb', line 38 def form_node @form_node end |
#ignore_encoding_error ⇒ Object
When true, character encoding errors will never be never raised on form submission. Default is false
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# File 'lib/mechanize/form.rb', line 34 def ignore_encoding_error @ignore_encoding_error end |
#method ⇒ Object
Returns the value of attribute method.
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# File 'lib/mechanize/form.rb', line 22 def method @method end |
#name ⇒ Object
Returns the value of attribute name.
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# File 'lib/mechanize/form.rb', line 22 def name @name end |
#page ⇒ Object (readonly)
Returns the value of attribute page.
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# File 'lib/mechanize/form.rb', line 39 def page @page end |
#radiobuttons ⇒ Object (readonly)
Returns the value of attribute radiobuttons.
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# File 'lib/mechanize/form.rb', line 24 def @radiobuttons end |
Instance Method Details
#[](field_name) ⇒ Object
Fetch the value of the first input field with the name passed in. Example:
puts form['name']
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# File 'lib/mechanize/form.rb', line 192 def [](field_name) f = field(field_name) f && f.value end |
#[]=(field_name, value) ⇒ Object
Set the value of the first input field with the name passed in. Example:
form['name'] = 'Aaron'
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# File 'lib/mechanize/form.rb', line 199 def []=(field_name, value) f = field(field_name) if f f.value = value else add_field!(field_name, value) end end |
#add_button_to_query(button) ⇒ Object
This method adds a button to the query. If the form needs to be submitted with multiple buttons, pass each button to this method.
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# File 'lib/mechanize/form.rb', line 321 def () unless .node.document == @form_node.document then = "#{.inspect} does not belong to the same page as " \ "the form #{@name.inspect} in #{@page.uri}" raise ArgumentError, end @clicked_buttons << end |
#add_field!(field_name, value = nil) ⇒ Object
Add a field with field_name
and value
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# File 'lib/mechanize/form.rb', line 152 def add_field!(field_name, value = nil) fields << Field.new({'name' => field_name}, value) end |
#build_query(buttons = []) ⇒ Object
This method builds an array of arrays that represent the query parameters to be used with this form. The return value can then be used to create a query string for this form.
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# File 'lib/mechanize/form.rb', line 251 def build_query( = []) query = [] @mech.log.info("form encoding: #{encoding}") if @mech && @mech.log save_hash_field_order successful_controls = [] (fields + checkboxes).reject do |f| f.node["disabled"] end.sort.each do |f| case f when Mechanize::Form::CheckBox if f.checked successful_controls << f end when Mechanize::Form::Field successful_controls << f end end radio_groups = {} .each do |f| fname = from_native_charset(f.name) radio_groups[fname] ||= [] radio_groups[fname] << f end # take one radio button from each group radio_groups.each_value do |g| checked = g.select {|f| f.checked} if checked.uniq.size > 1 then values = checked.map { || .value }.join(', ').inspect name = checked.first.name.inspect raise Mechanize::Error, "radiobuttons #{values} are checked in the #{name} group, " \ "only one is allowed" else successful_controls << checked.first unless checked.empty? end end @clicked_buttons.each { |b| successful_controls << b } successful_controls.sort.each do |ctrl| # DOM order qval = proc_query(ctrl) query.push(*qval) end query end |
#button ⇒ Object
:method: buttons_with(criteria)
Find all buttons that match criteria
Example:
form.(:value => /submit/).each do ||
.value = 'hello!'
end
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# File 'lib/mechanize/form.rb', line 417 elements_with :button |
#checkbox ⇒ Object
:method: checkboxes_with(criteria)
Find all checkboxes that match criteria
Example:
form.checkboxes_with(:name => /woo/).each do |field|
field.check
end
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# File 'lib/mechanize/form.rb', line 489 elements_with :checkbox, :checkboxes |
#click_button(button = buttons.first) ⇒ Object
Submit form using button
. Defaults to the first button.
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# File 'lib/mechanize/form.rb', line 228 def ( = .first) submit() end |
#delete_field!(field_name) ⇒ Object
Removes all fields with name field_name
.
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# File 'lib/mechanize/form.rb', line 367 def delete_field!(field_name) @fields.delete_if{ |f| f.name == field_name} end |
#dom_class ⇒ Object
This method is a shortcut to get form’s DOM class. Common usage:
page.form_with(:dom_class => "foorm")
Note that you can also use :class
to get to this method:
page.form_with(:class => "foorm")
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# File 'lib/mechanize/form.rb', line 147 def dom_class form_node['class'] end |
#dom_id ⇒ Object
This method is a shortcut to get form’s DOM id. Common usage:
page.form_with(:dom_id => "foorm")
Note that you can also use :id
to get to this method:
page.form_with(:id => "foorm")
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# File 'lib/mechanize/form.rb', line 138 def dom_id form_node['id'] end |
#field ⇒ Object
:method: fields_with(criteria)
Find all fields that match criteria
Example:
form.fields_with(:value => /foo/).each do |field|
field.value = 'hello!'
end
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# File 'lib/mechanize/form.rb', line 393 elements_with :field |
#file_upload ⇒ Object
:method: file_uploads_with(criteria)
Find all file upload fields that match criteria
Example:
form.file_uploads_with(:file_name => /picutre/).each do |field|
field.value = 'foo!'
end
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# File 'lib/mechanize/form.rb', line 441 elements_with :file_upload |
#has_field?(field_name) ⇒ Boolean Also known as: has_key?
Returns whether or not the form contains a field with field_name
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# File 'lib/mechanize/form.rb', line 57 def has_field?(field_name) fields.find { |f| f.name == field_name } end |
#has_value?(value) ⇒ Boolean
Returns whether or not the form contains a field with value
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# File 'lib/mechanize/form.rb', line 64 def has_value?(value) fields.find { |f| f.value == value } end |
#hidden_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Hidden field named field_name
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# File 'lib/mechanize/form.rb', line 124 def hidden_field?(field_name) hiddens.find { |f| f.name == field_name } end |
#hiddens ⇒ Object
Returns all fields of type Hidden
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# File 'lib/mechanize/form.rb', line 94 def hiddens @hiddens ||= fields.select { |f| f.class == Hidden } end |
#keygens ⇒ Object
Returns all fields of type Keygen
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# File 'lib/mechanize/form.rb', line 104 def keygens @keygens ||= fields.select { |f| f.class == Keygen } end |
#keys ⇒ Object
Returns all field names (keys) for this form
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# File 'lib/mechanize/form.rb', line 69 def keys fields.map { |f| f.name } end |
#pretty_print(q) ⇒ Object
:nodoc:
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# File 'lib/mechanize/form.rb', line 491 def pretty_print(q) # :nodoc: q.object_group(self) { q.breakable; q.group(1, '{name', '}') { q.breakable; q.pp name } q.breakable; q.group(1, '{method', '}') { q.breakable; q.pp method } q.breakable; q.group(1, '{action', '}') { q.breakable; q.pp action } q.breakable; q.group(1, '{fields', '}') { fields.each do |field| q.breakable q.pp field end } q.breakable; q.group(1, '{radiobuttons', '}') { .each { |b| q.breakable; q.pp b } } q.breakable; q.group(1, '{checkboxes', '}') { checkboxes.each { |b| q.breakable; q.pp b } } q.breakable; q.group(1, '{file_uploads', '}') { file_uploads.each { |b| q.breakable; q.pp b } } q.breakable; q.group(1, '{buttons', '}') { .each { |b| q.breakable; q.pp b } } } end |
#radiobutton ⇒ Object
:method: radiobuttons_with(criteria)
Find all radio buttons that match criteria
Example:
form.(:name => /woo/).each do |field|
field.check
end
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# File 'lib/mechanize/form.rb', line 465 elements_with :radiobutton |
#request_data ⇒ Object
This method calculates the request data to be sent back to the server for this form, depending on if this is a regular post, get, or a multi-part post,
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# File 'lib/mechanize/form.rb', line 343 def request_data query_params = build_query() case @enctype.downcase when /^multipart\/form-data/ boundary = rand_string(20) @enctype = "multipart/form-data; boundary=#{boundary}" params = query_params.map do |k,v| param_to_multipart(k, v) if k end.compact params.concat @file_uploads.map { |f| file_to_multipart(f) } params.map do |part| "--#{boundary}\r\n#{part.force_encoding(Encoding::ASCII_8BIT)}" end.join('') + "--#{boundary}--\r\n" else Mechanize::Util.build_query_string(query_params) end end |
#reset ⇒ Object
This method allows the same form to be submitted second time with the different submit button being clicked.
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# File 'lib/mechanize/form.rb', line 335 def reset # In the future, should add more functionality here to reset the form values to their defaults. @clicked_buttons = [] end |
#reset_button?(button_name) ⇒ Boolean
Returns whether or not the form contains a Reset button named button_name
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# File 'lib/mechanize/form.rb', line 114 def () resets.find { |f| f.name == } end |
#resets ⇒ Object
Returns all buttons of type Reset
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# File 'lib/mechanize/form.rb', line 84 def resets @resets ||= .select { |f| f.class == Reset } end |
#save_hash_field_order ⇒ Object
This method adds an index to all fields that have Hash nodes. This enables field sorting to maintain order.
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# File 'lib/mechanize/form.rb', line 308 def save_hash_field_order index = 0 fields.each do |field| if Hash === field.node field.index = index index += 1 end end end |
#set_fields(fields = {}) ⇒ Object
This method sets multiple fields on the form. It takes a list of fields
which are name, value pairs.
If there is more than one field found with the same name, this method will set the first one found. If you want to set the value of a duplicate field, use a value which is a Hash with the key as the index in to the form. The index is zero based.
For example, to set the second field named ‘foo’, you could do the following:
form.set_fields :foo => { 1 => 'bar' }
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# File 'lib/mechanize/form.rb', line 169 def set_fields fields = {} fields.each do |name, v| case v when Hash v.each do |index, value| self.fields_with(:name => name.to_s)[index].value = value end else value = nil index = 0 [v].flatten.each do |val| index = val.to_i if value value = val unless value end self.fields_with(:name => name.to_s)[index].value = value end end end |
#submit(button = nil, headers = {}) ⇒ Object
Submit the form. Does not include the button
as a form parameter. Use click_button
or provide button as a parameter.
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# File 'lib/mechanize/form.rb', line 222 def submit = nil, headers = {} @mech.submit(self, , headers) end |
#submit_button?(button_name) ⇒ Boolean
Returns whether or not the form contains a Submit button named button_name
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# File 'lib/mechanize/form.rb', line 109 def () submits.find { |f| f.name == } end |
#submits ⇒ Object
Returns all buttons of type Submit
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# File 'lib/mechanize/form.rb', line 79 def submits @submits ||= .select { |f| f.class == Submit } end |
#text_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Text field named field_name
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# File 'lib/mechanize/form.rb', line 119 def text_field?(field_name) texts.find { |f| f.name == field_name } end |
#textarea_field?(field_name) ⇒ Boolean
Returns whether or not the form contains a Textarea named field_name
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# File 'lib/mechanize/form.rb', line 129 def textarea_field?(field_name) textareas.find { |f| f.name == field_name } end |
#textareas ⇒ Object
Returns all fields of type Textarea
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# File 'lib/mechanize/form.rb', line 99 def textareas @textareas ||= fields.select { |f| f.class == Textarea } end |
#texts ⇒ Object
Returns all fields of type Text
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# File 'lib/mechanize/form.rb', line 89 def texts @texts ||= fields.select { |f| f.class == Text } end |
#values ⇒ Object
Returns all field values for this form
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# File 'lib/mechanize/form.rb', line 74 def values fields.map { |f| f.value } end |