Question

我正在尝试在我的Rails应用程序中使用动态选择菜单。

我有一个名为kase的模型，一个名为person的模型和一个名为company的模型。

当用户创建新的kase时，会向他们显示一个选择字段以选择一个人，并选择一个选择字段来选择一个公司。

我试图让它变得动态，所以如果他们在第一个选择字段中选择公司a，那么只有公司a的员工才会列在人员字段中。

模型关联如下：

class Kase < ActiveRecord::Base

  belongs_to :company # foreign key: company_id
  belongs_to :person # foreign key in join table
  belongs_to :surveyor,
             :class_name => "Company",
             :foreign_key => "appointedsurveyor_id"
  belongs_to :surveyorperson,
             :class_name => "Person",
             :foreign_key => "surveyorperson_id"

-------------------------------------------------  

class Company < ActiveRecord::Base
  has_many :kases
  has_many :people
  def to_s; companyname; end

-------------------------------------------------

class Person < ActiveRecord::Base
  has_many :kases # foreign key in join table
  belongs_to :company

更新JAVASCRIPT

var people = new Array();
<% for person in @people -%>
  people.push(new Array(<%= person.company_id %>, '<%=h person.personname %>', <%= person.id %>));
<% end -%>

function personSelected() {
  alert('hello world');
  appointedsurveyor_id = $('kase_appointedsurveyor_id').getValue();
  options = $('kase_surveyorperson_id').options;
  options.length = 1;
  people.each(function(person) {
    if (person[0] == appointedsurveyor_id) {
      options[options.length] = new Option(person[0], person[1]);
      alert('hello world')
    }
  });
  if (options.length == 1) {
    $('kase_surveyorperson_id').hide();
  } else {
    $('kase_surveyorperson_id').show();
  }
}

document.observe('dom:loaded', function() {
  $('kase_appointedsurveyor_id').observe('change', personSelected);
});

Answer 1

var people = new Array();
<% for person in @people -%>
  people.push(new Array(<%= person.id %>, '<%=h person.login %>'));
<% end -%>

function personSelected() {
  alert('hello world');
  appointedsurveyor_id = $('company_appointedsurveyor_id').getValue();
  options = $('person_appointedsurveyorperson_id').options;
  options.length = 1;
  people.each(function(person) {
    if (person[0] == appointedsurveyor_id) {
      options[options.length] = new Option(person[0], person[1]);
    }
  });
  if (options.length == 1) {
    $('person_field').hide();
  } else {
    $('person_field').show();
  }
}

document.observe('dom:loaded', function() {
  //companySelected(); << remove this
  $('person_field').observe('change', personSelected);
});

Answer 2

尝试observe_field。 http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M002183

Rails中的动态选择菜单？

2 个答案: