rails 表单form

来源：互联网发布：sqlserver with as 编辑：程序博客网时间：2024/05/22 15:06

基础总结

表单开始标签:
<%= form_tag { :action => :save }, { :method => :post } %>
Use :multipart => true to define a Mime-Multipart form (for file uploads)
表单结束标签:
<%= end_form_tag %>

文本框 Text fields
<%= text_field :modelname, :attribute_name, options %>
生成:
<input type="text" name="modelname[attribute_name]" id="attributename" />

实例:

text_field "post", "title", "size" => 20
<input type="text" id="post_title" name="post[title]"
size="20" value="#{@post.title}" />

隐藏框:
<%= hidden_field ... %>

密码框:
<%= password_field ... %>

文件框
<%= file_field ... %>

Rails Textarea框
<%= text_area ... %>
实例:
text_area "post", "body", "cols" => 20, "rows" => 40
     <textarea cols="20" rows="40" id="post_body" name="post[body]">
       #{@post.body}
     </textarea>

单选框 Radio Buttons
<%= radio_button :modelname, :attribute, :tag_value, options %>
实例:
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" />

多选框 Check Box
<%= check_box :modelname, :attribute, options, on_value, off_value %>
实例
check_box "post", "validated"    # post.validated? returns 1 or 0
     <input type="checkbox" id="post_validate" name="post[validated]"
          value="1" checked="checked" />
     <input name="post[validated]" type="hidden" value="0" />

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" />

<%= select :variable, :attribute, choices, options, html_options %>

下拉菜单框 Select Menu
select   "post",
         "person_id",
         Person.find_all.collect {|p| [ p.name, p.id ] },
         { :include_blank => true }

<select name="post[person_id]">
    <option></option>
    <option value="1" selected="selected">David</option>
    <option value="2">Sam</option>
    <option value="3">Tobias</option>
</select>

Collection Selection
<%= collection_select :variable, :attribute, choices, :id, :value %>

日期选择框:
<%= date_select :variable, :attribute, options %>
<%= datetime_select :variable, :attribute, options %>
实例:
date_select "post", "written_on"
date_select "user", "birthday", :start_year => 1910
date_select "user", "cc_date", :start_year => 2005,
                                :use_month_numbers => true,
                                :discard_day => true,
                                :order => [:year, :month]

datetime_select "post", "written_on"

Rails中两种不同的表单处理方式

1.表单类型一

<div class=""class="form">
       <%= error_messages_for 'user' %>
       <fieldset>
         <legend>请输入用户信息</legend>
      <% form_for :user do |form| %>
         <p>
           Name: <%= form.text_field :username, :size => 30     %>
         </p>
         <p>
           Password: <%= form.password_field :password, :size => 30 %>
         </p>
           <p>
             ConfirmPassword: <%= form.password_field :password_confirmation, :size => 30 %>
           </p>
           <%= submit_tag "注册", :class => "submit" %>
           <% end %>
       </fieldset>
     </div>
此种是对象绑定的方式，通过表单，跟Model层的对象绑定，通常完成数据的增，改功能。

2.表单类型二

<div class=""class="form">
       <%= error_messages_for 'user' %>
       <fieldset>
         <legend>请输入用户信息</legend>
         <% form_tag do %>
         <p>
           Name: <%= text_field_tag :username, params[:username], :size => 30     %>
         </p>
         <p>
           Password: <%= password_field_tag :password, params[:password], :size => 30 %>
         </p>
           <%= submit_tag "注册", :class => "submit" %>
           <% end %>
       </fieldset>
     </div>
此种主要是为了表单传值
form_for和model绑定，而form_tag不是
form_tag想传什么参数都行，没有约束

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