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我在我的rails项目中使用cocoon gem，我有两个“link_to_add_association”，但我需要根据按下哪个link_to来执行某个功能，id为“link_1”的link_to将记录添加到开头表和另一个在末尾添加其他值的记录，这是我的部分形式：

= form_for([@billing, @payment]) do |f|
  - if @payment.errors.any?
    = render partial: 'layouts/partials/errors/form_errors', locals: { errors: @payment.errors }
  = f.hidden_field :billing_id, value: @billing.id
  .row
    .col-md-6
      .form-group.row
        .col-md-4
          = f.label :payment, class: 'form-control-label'
        .col-md-8
          = f.text_field :payment, class: 'form-control text-right', 'data-currency-format--live': '', 'data-target': '#total-pay'
    .col-md-6
      .form-group.row
        .col-md-4
          = f.label :day, class: 'form-control-label'
        .col-md-6
          = f.text_field :day, class: 'form-control datepicker', 'data-startView': 'days', 'data-minyear': @billing.date_bill.year, 'data-minmonth': @billing.date_bill.month, 'data-minday': @billing.date_bill.day

        .col-md-1
          .links
            = link_to_add_association 'add', f, :payment_details, partial: 'payment_detail_fields',:"data-association-insertion-node" => "tbody.details",:"data-association-insertion-method" => "prepend", class:"btn btn-success btn-xs", id: "link_1"





        .col-md-1
          .links
            = link_to_add_association 'add', f, :payment_details, partial: 'payment_detail_discount_fields',:"data-association-insertion-node" => "tbody.details",:"data-association-insertion-method" => "append", class:"btn btn-success btn-xs", id: "link_2"




    .col-md-12
      #payment_details
        %table.tabla_personalizada
          %thead
            %tr
              %th value_paid
              %th voucher
              %th accion
              %th value_paid
              %th value_paid
              %th voucher
              %th accion

          %tbody.details
            = f.fields_for :payment_details do |payment_detail|
              = render 'payment_detail_fields', f: payment_detail

            %tr
              %td 
              %td 
              %td 
              %td 
              %td 
              %td 
              %td 
            %tr.descuentos
              %td Descuento
              %td Descuento              
              %td 
              %td 
              %td 
              %td 
              %td 

  .row
    .col-md-12
      = f.label :comments, class: 'form-control-label'
      = f.text_area :comments, class: 'form-control', rows: 6
  %hr
  .row
    .col-md-8
      .form-group.row
        .col-md-8
          = f.submit :class => 'btn btn-primary' 



- content_for :javascript do
  :javascript



    $(document).ready(function() {

      $("#link_1").on("cocoon:after-insert", function() {
        alert("element of link_1");
      } ) 

      $("#link_2").on("cocoon:after-insert", function() {
        alert("element of link_2");
      } ) 

    });

我试过这段代码，但我找不到让它工作的方法

$(document).ready(function() {

  $("#link_1").on("cocoon:after-insert", function() {
    alert("element of link_1");
  } ) 

  $("#link_2").on("cocoon:after-insert", function() {
    alert("element of link_1");
  } ) 

});
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