我有一个模型 ( Listing)，它有很多很多属性（比如 25 个）。
我想根据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，它们应该立即从数据库中加载正确的内容——即以 AJAXy 方式。
解决这个问题的最佳方法是什么？
谢谢。
编辑：这是我的_form.html.erb. 您会注意到我包含了 2 个语句，这些语句指示如果选择的值是指定的值之一，if则应显示哪些字段：property_type
<%= 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="✓" /><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>
这是我包含在我的listing.js- 对应于此表单所在的文件的 JSapp/views/listings/new.html.erb
$(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，它没有显示我想要查看的字段。