Kindeditor ajax post for Ruby on Rails

konwledge.js

_form.html.erb
    <%= f.input :body, :width => 850, :height => 500 %>

refresh.js.erb

$("#edit_<%= dom_id @knowledge %>").replaceWith("<%= render 'refresh_form'%>");
$("#new_knowledge").replaceWith("<%= render 'refresh_form'%>");
var editor = KindEditor.create(
    'textarea[id="knowledge_body"]',
    {
      width : '850px',
      height: '500px',
      uploadJson: '/kindeditor/upload',
      fileManagerJson: '/kindeditor/filemanager'
    }
    );

$(document).ready(function(){
  var editor = KindEditor.create(
    'textarea[id="knowledge_body"]',
    {
      width : '850px',
      height: '500px',
      uploadJson: '/kindeditor/upload',
      fileManagerJson: '/kindeditor/filemanager'
    }
    );

  $("input").click(function(){
    editor.sync('knowledge_body');
    // 同步数据后可以直接取得textarea的value
    body = document.getElementById('knowledge_body').value; // 原生API
    $("#knowledge_body").val(body);
  });
});