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Ruby on Rails - HTML Forms


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Form:

To create a form tag with the specified action, and with POST request, use the following syntax:

<%= form_tag :action => 'update', :id => @some_object %>

<%= form_tag( { :action => :save, }, { :method => :post }) %>

Use :multipart => true to define a MIME-multipart form (for file uploads).

<%= form_tag( {:action => 'upload'}, :multipart => true ) %>

File Upload:

Define a multipart form in your view:

<%= form_tag( { :action => 'upload' }, :multipart => true ) %>
  Upload file: <%= file_field( "form", "file" ) %>
  <br />
  <%= submit_tag( "Upload file" ) %>
<%= end_form_tag %>

Handle the upload in the controller:

def upload
  file_field = @params['form']['file'] rescue nil
  # file_field is a StringIO object
  file_field.content_type # 'text/csv'
  file_field.full_original_filename
  ...
end

Text Fields:

To create a text field use the following syntax:

<%= text_field :modelname, :attribute_name, options %>

Have a look at the following example:

<%= text_field "person", "name", "size" => 20 %>

This will generate following code:

<input type="text" id="person_name" name="person[name]"
      size="20" value="<%= @person.name %>" />

To create hidden fileds use the following syntax;

<%= hidden_field ... %>

To create password fileds use the following syntax;

<%= password_field ... %>

To create file upload fileds use the following syntax;

<%= file_field ... %>

Text Area:

To create a text area use the following syantax:

<%= text_area ... %>

Have a look at the following example:

<%= text_area "post", "body", "cols" => 20, "rows" => 40%>

This will generate following code:

<textarea cols="20" rows="40" id="post_body" name="post[body]">
<%={@post.body}%>
</textarea>

Radio Button:

To create a Radio Button use the following syantax:

<%= radio_button :modelname, :attribute, :tag_value, options %>

Have a look at the following example:

 radio_button("post", "category", "rails")
 radio_button("post", "category", "java")

This will generate following code:

<input type="radio" id="post_category" name="post[category]" 
                    value="rails" checked="checked" />
<input type="radio" id="post_category" name="post[category]" 
                    value="java" />

Checkbox Button:

To create a Checkbox Button use the following syantax:

<%= check_box :modelname, :attribute,options,on_value,off_value%>

Have a look at the following example:

 check_box("post", "validated")

This will generate following code:

<input type="checkbox" id="post_validate" name="post[validated]" 
                                   value="1" checked="checked" />
<input name="post[validated]" type="hidden" value="0" />

Let's check another example:

check_box("puppy", "gooddog", {}, "yes", "no")

This will generate following code:

<input type="checkbox" id="puppy_gooddog" name="puppy[gooddog]" 
                                           value="yes" />
<input name="puppy[gooddog]" type="hidden" value="no" />

Options:

To create a dropdopwn list use the following syntax:

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

Have a look at the following example:

select("post", "person_id", 
       Person.find(:all).collect {|p| [ p.name, p.id ] })

This could generate following code. It depends on what value is available in your database.:

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

Date Time:

Following is the syntax to use data and time:

<%= date_select :variable, :attribute, options %>
<%= datetime_select :variable, :attribute, options %>

Following are examples of usage:

<%=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"%>

End Form Tag

Use following syntax to create </form> tag:

<%= end_form_tag %>

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