逝者如斯 不舍昼夜

为了方便对rhtml中表单的学习和使用，整理了一部分rails常用表单用法。

表单开始标签:
<%= form_tag { :action => :save }, { :method => :post } %>
#开始一个表单，相当于
#html表单<input type="form" action="save",method="post">
Use :multipart => true to define a Mime-Multipart form (for file uploads)
#定义一个Mime-Multipart格式的表单，用于文件上传

表单结束标签:
<%= end_form_tag %>

文本框 Text fields
<%= text_field :modelname, :attribute_name, options%>
#这个是最常用的文本输入框，三个参数依次是模型名，模型的属性名，以及选项，诸如size,value等文本框属性。
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 ... %>
#隐藏表单，类似<input type="hidden"..>

密码框:
<%= password_field ... %>
#类似<input type="password"..>

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"