Ruby-on-Rails:根据先验选择填充选择框 [英] Ruby-on-Rails: populate select box based off prior select

问题描述

我有一组 3 个 collection_select，我想过滤下一个选择.在第一个选择框中选择一个项目时，它应该限制第二个和第三个选择框的可能值.

类似的数据模型如下...

表格和字段

• 锁
  • lock_id
  • brand_id
  • master_id
  • regular_id
• 锁品牌
  • brand_id
• 万能钥匙
  • master_id
  • brand_id
• 普通密钥
  • regular_id
  • brand_id

因此，在填写添加新锁的表单时，会有品牌、主和常规的选择框.选择品牌后，它会将主密钥和常规密钥限制为仅属于所选品牌的密钥.

我找到了一些关于如何执行此操作的部分示例，但没有一个是完整的.我很感激如何实现这一点的完整示例.

解决方案

您需要做的就是将选择与事件侦听器绑定，该侦听器触发 ajax 请求，填充包含后续选择的其他 2 个部分.即

<%= form_for @thing, :remote =>真的做，:更新=>'second_form' |f|％＞<%= hidden_​​field_tag 'form_partial', :value =>'form_2' %><%= select_tag :some_param, [[a,a],[b,b],[c,c]] :class =>'可提交'%><%= f.label :checked %><%=thing.name %><%结束%><div id='second_form'>

<div id='third_form'>

类 ThingController <应用控制器定义更新checkboxes = some_logic_to_select_checkboxes from params[:some_params]渲染:部分=>params[:form_partial], :locals =>{:select_menu =>选择菜单}结尾结尾$('.submittable').live('change', function() {$(this).parents('form:first').submit();返回假；});

您的表单部分应包含填充了您想要启用的任何选择的表单.只是重复表格的想法是多余的.

I have a set of 3 collection_selects that I would like to filter the next select. Upon selecting an item in the first select box, it should limit the possible values of the second and third select boxes.

A similar data model would be as follows...

Tables, and fields

• Lock
  • lock_id
  • brand_id
  • master_id
  • regular_id
• Lock Brand
  • brand_id
• Master Key
  • master_id
  • brand_id
• Regular Key
  • regular_id
  • brand_id

So while filling in the form for adding a new Lock there would be select boxes for brand, master, and regular. Upon selecting a brand, it would then limit the master and regular keys to those that are only of the selected brand.

I've found a couple partial examples of how to do this, however none are complete. I'd appreciate a complete example of how to implement this.

解决方案

All you need to do is bind the selects with an event listener that fires off an ajax request populating the other 2 partials containing the subsequent selects. i.e.

<%= form_for @thing, :remote => true do, :update => 'second_form' |f| %>
  <%= hidden_field_tag 'form_partial', :value => 'form_2' %> 
  <%= select_tag :some_param, [[a,a],[b,b],[c,c]] :class => 'submittable' %> 
  <%= f.label :checked %>
  <%= thing.name %>
<% end %>
<div id='second_form'>
</div>
<div id='third_form'>
</div>

class ThingController < ApplicationController
  def update
    checkboxes = some_logic_to_select_checkboxes from params[:some_params]
    render :partial => params[:form_partial], :locals => {:select_menu => select_menu}
  end
end

$('.submittable').live('change', function() {
  $(this).parents('form:first').submit();
  return false;
});

Your form partial should contain your forms populated with whatever selects you want enabled. Thought is was redundant to just repeat the form.

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