ruby-on-rails – 如何使用Simple Form创建交互式表单？

我想基于表单中的输入创建一个动态的AJAX表单.

这意味着如果用户选择type = b,他们将看到他们应该看到的其他字段,而不是他们不应该看到的字段.

理想情况下,他们应该使用db中的正确内容立即加载 – 即以AJAXy方式加载.

什么是最好的方法来解决这个问题？

谢谢.

编辑：以下是我的_form.html.erb示例.您会注意到我已经包含了2个if语句,这些语句指示如果选择的property_type值是指定的那个,则应显示哪些字段：

<%= simple_form_for(@listing) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :headline %>
    <%= f.input :price %>    
    <%= f.association :property_type %>

    If property_type == "coop"

    <%= f.input :maintenance %>
    <%= f.input :coop_deductible %>
    <%= f.input :flip_tax %>

    if property_type == "condo"

    <%= f.input :common_charges %>
    <%= f.input :taxes %>
  </div>

  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

编辑2：

这是我使用的Rails表单助手 – 由gem Simple_Form提供支持：

<%= simple_form_for @listing,:defaults => { :wrapper_html => { :class => 'form-horizontal' } } do |f| %>
  <%= f.error_notification %>
  <fieldset>
    <%= f.association :listing_category,:label => "Category: ",:label_html => { :class => "control-label"},:wrapper_html => { :class => "controls"} %>

    <div style="display: none;" data-show-for="Exclusive">
        <%= f.association :listing_type %>
      <%= f.association :user %>
      <%= f.association :boro %>
    </div>

    <div style="display: none;" data-show-for="Open">
      <%= f.association :neighborhood %>    
      <%= f.association :building %>
      <%= f.association :term %>
      <%= f.association :property_type %>
    </div>

    <div class="form-actions">
    <%= f.button :submit,:class => "btn btn-primary" %>
    <!-- <button type="submit" class="btn btn-primary">Save and Continue</button>
    <button type="reset" class="btn">Cancel</button> -->
    </div>
  </fieldset>

  <% end %>

这是它生成的HTML：

<form accept-charset="UTF-8" action="/listings" class="simple_form new_listing" id="new_listing" method="post" novalidate="novalidate"><div style="margin:0;padding:0;display:inline"><input name="utf8" type="hidden" value="&#x2713;" /><input name="authenticity_token" type="hidden" value="1oDfg41Wx/SiPCsvf4qTAcxhFUGSNlhlLfkMy8nHW1E=" /></div>

              <fieldset>
                <div class="control-group select optional controls"><label class="select optional control-label control-label" for="listing_listing_category_id">Category:</label><div class="controls"><select class="select optional" id="listing_listing_category_id" name="listing[listing_category_id]"><option value=""></option>
<option value="1">Exclusive</option>
<option value="2">Open</option></select></div></div>

          <div style="display: none;" data-show-for="Exclusive">
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_listing_type_id">Listing type</label><div class="controls"><select class="select optional" id="listing_listing_type_id" name="listing[listing_type_id]"><option value=""></option>
</select></div></div>
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_user_id">User</label><div class="controls"><select class="select optional" id="listing_user_id" name="listing[user_id]"><option value=""></option>
<option value="1">First User</option>
<option value="2">Second User</option>
<option value="3">Third User</option>
<option value="4">Fourth User</option>
<option value="5">Fifth User</option></select></div></div>
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_boro_id">Boro</label><div class="controls"><select class="select optional" id="listing_boro_id" name="listing[boro_id]"><option value=""></option>
<option value="1">Brooklyn</option></select></div></div>
          </div>

          <div style="display: none;" data-show-for="Open">
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_neighborhood_id">Neighborhood</label><div class="controls"><select class="select optional" id="listing_neighborhood_id" name="listing[neighborhood_id]"><option value=""></option>
<option value="1">Prospect Heights</option></select></div></div>    
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_building_id">Building</label><div class="controls"><select class="select optional" id="listing_building_id" name="listing[building_id]"><option value=""></option>
<option value="1">Trump Towers</option></select></div></div>
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_term_id">Term</label><div class="controls"><select class="select optional" id="listing_term_id" name="listing[term_id]"><option value=""></option>
</select></div></div>
            <div class="control-group select optional form-horizontal"><label class="select optional control-label" for="listing_property_type_id">Property type</label><div class="controls"><select class="select optional" id="listing_property_type_id" name="listing[property_type_id]"><option value=""></option>
<option value="1">Coop</option></select></div></div>
          </div>


    <div class="form-actions">
                <input class="btn btn btn-primary" name="commit" type="submit" value="Create Listing" />
          <!-- <button type="submit" class="btn btn-primary">Save and Continue</button>
          <button type="reset" class="btn">Cancel</button> -->
                </div>
              </fieldset>

</form>

这是我在listing.js中包含的JS – 它对应于此表单在app / views / listings / new.html.erb上的文件

$(document).ready(function({

    $('#listing_listing_category_id').on('change',function(){
        var option = $(this).find(':selected');
        $('[data-show-for]').hide(); //And maybe reset?
        $('[data-show-for="+ option.text +"]').show()
    });

});

当我选择我想要的选项时,它不会显示我想要看到的字段.