methods to nested attributes jquery plugin

nested_attribute.js

// 1.
$('a.more_emails').on( 'click', addEmailsFields);

// 1.1
$('input[id*="client_client_emails_attributes"]').each(function(index, element){
  $(element).parent().css({position: 'relative'});
  $(element).parent().append(createRemoveEmailLink);
});


// 2.
function addEmailsFields(event){
  var link            = $(event.target);
  var parent          = link.parent();
  var input           = parent.find('input[id*="emails_attributes"]')[0];

  addMoreFields(link, input, 'email', 'E-mail', 'client_client_emails_attributes_', 'client[client_emails_attributes]', createRemoveEmailLink());
}

// 3.1
function addMoreFields(link, input, field_name, label_txt, id_attr, name_attr, remove_link_method){
    var field_number  = input ? parseInt($(input).attr('name').match(/\d/)[0]) + 1 : 0;
    var fields        = fieldNameAndId(field_number, field_name, id_attr, name_attr);

  var label = $('<label>',
    { for: fields.id })
    .text(label_txt);

  var new_input = $('<input>',
    {
      id: fields.id,
      name: fields.name,
      type: 'text',
      size: '50'
    });

  var container = $('<div>',
    { class: 'input string' })
    .css({ position: 'relative' });

  container.append(label);
  container.append(new_input);
  container.append(remove_link_method);

  link.before(container);
}

// 3.2
function fieldNameAndId(process_number, field_name, id, name){
    var id_attr    = id+process_number+"_"+field_name;
    var name_attr  = name+"["+process_number+"]["+field_name+"]";

    return {
      id: id_attr,
      name: name_attr
    }
}

// 4.
function removeEmailsFields(event){
  var link          = $(event.target);
  var parent        = link.parent();
  var input_hidden  = parent.next();

  removeMoreFields(link, parent, input_hidden, 'client_client_emails_attributes_', 'client[client_emails_attributes]');
}

// 5.
function removeMoreFields(link, parent, input_hidden, id_attr, name_attr){
  if (input_hidden.is("input")) {
    var field_number  = parseInt(input_hidden.attr('name').match(/\d/)[0]);
    var fields        = fieldNameAndId(field_number, '_destroy', id_attr, name_attr);

    var input = $('<input>',
      {
        type: 'hidden',
        id: fields.id,
        name: fields.name
      }).attr('value', '1');

    parent.append(input);
  }

  link.parent().fadeOut();
}

// 6.
function createRemoveEmailLink(){
  var link = $('<a>', {
        href: 'javascript://',
        class: 'less_process'
      })
      .text('-')
      .on('click', removeEmailsFields);

  return link;
}