如何在simple_form中使用select2-rails？

Question

This select2 jquery库看起来棒极了。有一个Rails gem，但是它在文档中很轻。我想要生成一个简单的多重下拉菜单，使用自动完成.我该怎么做？

这是我的simple_form_for电话：

<%= f.input_field :neighborhood_names, url: autocomplete_neighborhood_name_searches_path, as: :autocomplete, data: { delimiter: ',', placeholder: "Where do you want to live?"}, multiple: true, id: "selectWhereToLive", class: "span8" %>

我已经成功地安装了select2-rails gem，但不太确定如何使它工作。

我将其添加到我的home.js.coffee文件中：

jQuery ->
    $('#selectWhereToLive').select2()

我得到了这个错误：

Uncaught query function not defined for Select2 selectWhereToLive 

有什么想法？

编辑1:

上面的simple_form_for调用生成了这个HTML：

<input class="autocomplete optional span8" data-autocomplete="/searches/autocomplete_neighborhood_name" data-delimiter="," data-placeholder="Where do you want to live?" id="selectWhereToLive" multiple="multiple" name="search[neighborhood_names][]" size="30" type="text" url="/searches/autocomplete_neighborhood_name" value="" />

指示正在正确设置id属性。

编辑2-更新的

正如@moonfly建议的那样，我尝试将as: :select添加到f.input_field中--包括as: :autocomplete和未包含as: :autocomplete。

没有as: :autocomplete的HTML结果如下：

<input name="search[neighborhood_names][]" type="hidden" value="" /><select class="select optional span8" data-delimiter="," data-placeholder="Where do you want to live?" id="selectWhereToLive" multiple="multiple" name="search[neighborhood_names][]" url="/searches/autocomplete_neighborhood_name"><option value="true">Yes</option>
<option value="false">No</option></select>

它预先填充2个选项值‘是’和‘否’.不太清楚为什么，但它就是这么做的。

更新

因此，我更改了jquery选择器以查找input#ID，然后忘记了。所以我把它放回原处，现在它正在生成选择框--但是它给了我这2，Yes & No选项。不太清楚它为什么要这么做。它不会从我的url属性返回值。

编辑3

@harish-shetty的建议似乎是可行的。但是现在，在通过自动完成并使用select2菜单成功找到记录之后，它绕过了我在search.rb模型上的setter方法。

基本上，我想要发生的是，一旦用户完成了表单的填写--而且我有了他们想要的邻居的所有in /名称，我想在search_neighborhoods中为这些in创建一个新的记录。

以下是我的方法：

Search.rb

  def neighborhood_names
    neighborhoods.map(&:name).join(',')
  end

  # we need to put [0] because it returns an array with a single element containing
  # the string of comma separated neighborhoods
  def neighborhood_names=(names)
    names[0].split(',').each do |name|
      next if name.blank?
      if neighborhood = Neighborhood.find_by_name(name)
        search_neighborhoods.build neighborhood_id: neighborhood.id
      end
    end
  end

我的SearchController.rb

  def autocomplete_neighborhood_name
    @neighborhood = Neighborhood.select("id, name").where("name LIKE ?", "#{params[:name]}%").order(:name).limit(10)

    respond_to do |format|
      format.json { render json: @neighborhood , :only => [:id, :name] }
    end    
  end

这就是现在请求的样子--这表明没有创建任何search_neighborhood记录：

Started POST "/searches" for 127.0.0.1 at 2013-03-06 04:09:55 -0500
Processing by SearchesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"7SeA=", "search"=>{"boro_id"=>"", "neighborhood_names"=>"1416,1394", "property_type_id"=>"", "min_price"=>"", "max_price"=>"", "num_bedrooms"=>"", "num_bathrooms"=>""}}
  Neighborhood Load (0.5ms)  SELECT "neighborhoods".* FROM "neighborhoods" WHERE "neighborhoods"."name" = '1' LIMIT 1
   (0.3ms)  BEGIN
  SQL (0.8ms)  INSERT INTO "searches" ("amenity_id", "boro_id", "created_at", "keywords", "listing_type_id", "max_price", "min_price", "neighborhood_id", "num_bathrooms", "num_bedrooms", "property_type_id", "square_footage", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13) RETURNING "id"  [["amenity_id", nil], ["boro_id", nil], ["created_at", Wed, 06 Mar 2013 09:09:55 UTC +00:00], ["keywords", nil], ["listing_type_id", nil], ["max_price", nil], ["min_price", nil], ["neighborhood_id", nil], ["num_bathrooms", nil], ["num_bedrooms", nil], ["property_type_id", nil], ["square_footage", nil], ["updated_at", Wed, 06 Mar 2013 09:09:55 UTC +00:00]]
   (32.2ms)  COMMIT
Redirected to http://localhost:3000/searches/29

Answer 1

select2插件支持自动完成.您可以使用本机自动完成，如下所示：

<%= f.input_field :ac_neighborhood_ids, 
      data: { 
        placeholder: "Where do you want to live?",
        saved: @search.neighborhoods.to_json,
        url: autocomplete_neighborhood_name_searches_path
      }, 
      input_html:  { class: "span8 ac-select2" }
%>

Javscript

$(document).ready(function() {  
  $('.ac-select2').each(function() {
    var url = $(this).data('url'); 
    var placeholder = $(this).data('placeholder'); 
    var saved = jQuery.parseJSON($(this).data('saved'));
    $(this).select2({
      minimumInputLength: 2,
      multiple: true,
      placeholder : placeholder,
      allowClear: true,
      ajax: {
        url: url,
        dataType: 'json',
        quietMillis: 500,
        data: function (term) {
          return {
            name: term
          };
        },
        results: function (data) {
          return {results: data};
        }
      },

      formatResult: function (item, page) {
        return item.name; 
      },

      formatSelection: function (item, page) {
        return item.name; 
      },

      initSelection : function (element, callback) {
        if (saved) {
          callback(saved);
        }
      }

    });
  });
});

确保autocomplete_neighborhood_name_searches_path上的操作返回一个散列的json数组。每个散列都应该包含id和name字段。自动完成的术语通过查询参数name传递.

  def autocomplete_neighborhood_name
    @neighborhood = Neighborhood.select("id, name").where("name LIKE ?", "#{params[:name]}%").order(:name).limit(10)

    respond_to do |format|
      format.json { render json: @neighborhood , :only => [:id, :name] }
    end    
  end

你的搜索模式：

class Search

  attr_accessor :ac_neighborhood_ids

  has_many :search_neighborhoods
  has_many :neighborhoods, through: :search_neighborhoods

  def ac_neighborhood_ids
    neighborhood_ids.join(",")
  end

  def ac_neighborhoods
    neighborhoods.map{|n| {:id => n.id, :name => n.name}}
  end

  def ac_neighborhood_ids=(ids)
    search_neighborhoods.clear # remove the old values
    ids.split(',').select(&:present?).map do |neighborhood_id|
      search_neighborhoods.build neighborhood_id: neighborhood_id
    end
  end

end    

Answer 2

我相信您需要附加select来选择标记(然后从它读取数据)或输入隐藏标记，然后您需要提供'query‘函数。在您的示例中，它被附加到输入标记上，从而查找查询函数。尝试在您的as: :select调用中设置f.input_field。

Answer 3

使用as：:select with集合是select2的常规方式。在select2上绑定自动完成是一个javascript问题。

这是我的代码样本。但没有自动完成。https://gist.github.com/kuboon/f692d9a844c0ff5877c8