ckeditorsaveajax.js

    <link rel="stylesheet" property="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css">
    <script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js"></script>
    <script>
      $("#category").select2({
        tags: true, placeholder :'Categories', width: '100%'
      });
      $("#tags").select2({
        tags: true, placeholder :'Tags', width: '100%'
      });
      $('.layout-picker').on('click', function(){
         $('.layout-picker').removeClass('active');
         $(this).addClass('active');
        $('#template').val($(this).data('tpl'));
      });
    </script>
  <script src="/js/plugins/ckeditor/ckeditor.js"></script>
  <script>
    CKEDITOR.plugins.addExternal('imageupload', '/js/plugins/ckeditor/plugins/imageupload/', 'plugin.js');
    var editor = CKEDITOR.inline('bodyi', {
      extraPlugins: 'imageupload,codesnippet,sourcedialog',
      toolbar: [
        { name: 'document', groups: [ 'mode', 'document', 'doctools' ], items: ['Templates', 'Paste', 'PasteText', 'Scayt' ] },
        { name: 'paragraph', groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ], items: [ 'NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'Blockquote', 'CreateDiv', '-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock', '-', 'BidiLtr', 'BidiRtl' ] },
        { name: 'insert', items: [ 'Image', 'Flash', 'Table' ] },
        { name: 'colors', items: [ 'TextColor', 'BGColor', '-','ShowBlocks'  ] },
        '/',
        { name: 'links', items: [ 'Link', 'Unlink' ] },
        { name: 'others', items: [ 'Source', 'Imageupload', 'CodeSnippet', 'SourceDialog' ] },
        { name: 'styles', items: [ 'Styles', 'Format', 'Font', 'FontSize' ] },
        { name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ], items: [ 'Bold', 'Italic', 'Underline', 'Strike', '-', 'RemoveFormat', '-', 'HorizontalRule' ] },
      ],
      on: {
        instanceReady: function() {
            periodicData();
        }
     }
    });
    var periodicData = ( function(){
      var data, oldData;
      return function() {
          if ( ( data = editor.getData() ) !== oldData ) {
              oldData = data;
              $('#body').val(data);
          }
        setTimeout( periodicData, 1000 );
     };
   })();
  </script>
  <script>
    $('#form').postJson(function( data ) {
      if(data.success){
        window.location=data.success
      }else if(data.failed){
        alert('Sorry, something was wrong: ' + data.failed);
      } else alert('Sorry, something went very wrong: ' + data);
    });
  </script>

jquery post json.php

$.fn.postJson = function(success) {
  return this.each(function() {
	$(this).on('submit', function(){
	  $.post( $(this).data('action'),  $(this).serialize(), success, "json");
	  return false;
	});
  });
};