rails text_field/text_area/hidden_field/password_field

1.text_field 

------------------------- ActionView::Helpers::FormHelper#text_field
text_field(object_name, method, options = {})
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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}" />
2.text_area

text_area(object_name, method, options = {})

Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified bymethod) on an object assigned to the template (identified byobject). Additional options on the input tag can be passed as a hash withoptions.

Examples

  text_area(:post, :body, :cols => 20, :rows => 40)  # => <textarea cols="20" rows="40" id="post_body" name="post[body]">  #      #{@post.body}  #    </textarea>  text_area(:comment, :text, :size => "20x30")  # => <textarea cols="20" rows="30" id="comment_text" name="comment[text]">  #      #{@comment.text}  #    </textarea>  text_area(:application, :notes, :cols => 40, :rows => 15, :class => 'app_input')  # => <textarea cols="40" rows="15" id="application_notes" name="application[notes]" class="app_input">  #      #{@application.notes}  #    </textarea>  text_area(:entry, :body, :size => "20x20", :disabled => 'disabled')  # => <textarea cols="20" rows="20" id="entry_body" name="entry[body]" disabled="disabled">  #      #{@entry.body}  #    </textarea>

3.hidden_field

hidden_field(object_name, method, options = {})

Returns a hidden input tag tailored for accessing a specified attribute (identified bymethod) on an object assigned to the template (identified byobject). Additional options on the input tag can be passed as a hash withoptions. These options will be tagged onto the HTML as an HTML element attribute as in the example shown.

Examples

  hidden_field(:signup, :pass_confirm)  # => <input type="hidden" id="signup_pass_confirm" name="signup[pass_confirm]" value="#{@signup.pass_confirm}" />  hidden_field(:post, :tag_list)  # => <input type="hidden" id="post_tag_list" name="post[tag_list]" value="#{@post.tag_list}" />  hidden_field(:user, :token)  # => <input type="hidden" id="user_token" name="user[token]" value="#{@user.token}" />

4.password_field(object_name, method, options = {}) 
Returns an input tag of the "password" 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. These options will be tagged onto the HTML as an HTML element attribute as in the example shown. 
Examples
  password_field(:login, :pass, :size => 20)  # => <input type="text" id="login_pass" name="login[pass]" size="20" value="#{@login.pass}" />  password_field(:account, :secret, :class => "form_input")  # => <input type="text" id="account_secret" name="account[secret]" value="#{@account.secret}" class="form_input" />  password_field(:user, :password, :onchange => "if $('user[password]').length > 30 { alert('Your password needs to be shorter!'); }")  # => <input type="text" id="user_password" name="user[password]" value="#{@user.password}" onchange = "if $('user[password]').length > 30 { alert('Your password needs to be shorter!'); }"/>  password_field(:account, :pin, :size => 20, :class => 'form_input')  # => <input type="text" id="account_pin" name="account[pin]" size="20" value="#{@account.pin}" class="form_input" />___________________________________________________________

 

转自：http://blog.csdn.net/linda_cai/article/details/2093498