diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9203371..52826ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG: jquery.ajax-combobox
 
+## v7.5.3
+#### Deprecated
+- Lowercase "asc" or "desc" in `order_by` are **deprecated**.  
+  (e.g. `order_by: ['field1 asc', 'field2 desc']`)  
+  In the future, lowercase "asc" or "desc" are judged to be field names.
+
 ## v7.5.0
 - Extend `button_img` option to accept HTML element such as `<img>` or `<svg>`.  
   See [Document](http://www.usamimi.info/~sutara/ajax-combobox/sample/others.html#button-image).
diff --git a/README.md b/README.md
index f8cb92e..71e1ae0 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ new AjaxComboBox($sqlite);
 |[db_table](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_01)|string|'tbl'|Table of database to query|
 |field|string|'name'|Field of table to display on result|
 |[search_field](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_04)|string|=field|Field of table to search. Accept comma separated string. (e.g.: `'id, name, job'`)|
-|[order_by](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_06)|mixed|=search_field|Field for sorting (e.g.: `'name DESC'`, `['name ASC', 'age DESC']`)|
+|[order_by](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_06)|mixed|=search_field|Field for sorting (e.g. `'name DESC'`, `['name ASC', 'age DESC']`).<br>`ASC` or `DESC` should be UPPERCASE.|
 |[and_or](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_05)|string|'AND'|Boolean searching ('AND', 'OR')|
 |[per_page](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_02)|number|10|Amount of items per page|
 |[navi_num](https://sutara79-php.herokuapp.com/demo/jquery.ajax-combobox/sample/basic.html#sample01_02)|number|5|Amount of page-link on navi|
diff --git a/dist/js/jquery.ajax-combobox.min.js b/dist/js/jquery.ajax-combobox.min.js
index 3856536..bb38cef 100644
--- a/dist/js/jquery.ajax-combobox.min.js
+++ b/dist/js/jquery.ajax-combobox.min.js
@@ -1 +1 @@
-/*! jquery.ajax-combobox v7.5.2 | Yuusaku Miyazaki <toumin.m7@gmail.com> | license: MIT */!function(e){var t={};function o(s){if(t[s])return t[s].exports;var n=t[s]={i:s,l:!1,exports:{}};return e[s].call(n.exports,n,n.exports,o),n.l=!0,n.exports}o.m=e,o.c=t,o.d=function(e,t,s){o.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:s})},o.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},o.t=function(e,t){if(1&t&&(e=o(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var s=Object.create(null);if(o.r(s),Object.defineProperty(s,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var n in e)o.d(s,n,function(t){return e[t]}.bind(null,n));return s},o.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return o.d(t,"a",t),t},o.o=function(e,t){return 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\ No newline at end of file
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0===a.candidate&&(a.candidate=[]),a.cnt_page=a.candidate.length,e._prepareResults(e,a,t,o)}else e._notFoundSearch(e)}},h={_sortAsc:function(e,t){return t.sort(function(t,o){return t[e.option.order_by[0][0]].localeCompare(o[e.option.order_by[0][0]])}),t},_sortDesc:function(e,t){return t.sort(function(t,o){return 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a=$(e.elem.results).children("li").eq(n);$(a).addClass(e.css_class.select),e._setSubInfo(e,a),e.prop.is_paging=!1,e._setCssFocusedResults(e)}},_setNavi:function(e,t,o,s){var n=e.option.per_page*(s-1)+1,i=n+o-1,a=e.message.page_info.replace("cnt_whole",t).replace("num_page_top",n).replace("num_page_end",i);$(e.elem.navi_info).text(a);var r=Math.ceil(t/e.option.per_page);if(r>1){$(e.elem.navi_p).empty(),e.prop.is_suggest?e.prop.max_suggest=r:e.prop.max_all=r;for(var l=s-Math.ceil((e.option.navi_num-1)/2),p=s+Math.floor((e.option.navi_num-1)/2);l<1;)l++,p++;for(;p>r;)p--;for(;p-l<e.option.navi_num-1&&l>1;)l--;1==s?(e.option.navi_simple||$("<span>").text("<< 1").addClass("page_end").appendTo(e.elem.navi_p),$("<span>").text(e.message.prev).addClass("page_end").appendTo(e.elem.navi_p)):(e.option.navi_simple||$("<a>").attr({href:"javascript:void(0)",class:"navi_first"}).text("<< 1").attr("title",e.message.first_title).appendTo(e.elem.navi_p),$("<a>").attr({href:"javascript:void(0)",class:"navi_prev",title:e.message.prev_title}).text(e.message.prev).appendTo(e.elem.navi_p));for(var _=l;_<=p;_++){var c=_==s?'<span class="current">'+_+"</span>":_;$("<a>").attr({href:"javascript:void(0)",class:"navi_page"}).html(c).appendTo(e.elem.navi_p)}s==r?($("<span>").text(e.message.next).addClass("page_end").appendTo(e.elem.navi_p),e.option.navi_simple||$("<span>").text(r+" >>").addClass("page_end").appendTo(e.elem.navi_p)):($("<a>").attr({href:"javascript:void(0)",class:"navi_next"}).text(e.message.next).attr("title",e.message.next_title).appendTo(e.elem.navi_p),e.option.navi_simple||$("<a>").attr({href:"javascript:void(0)",class:"navi_last"}).text(r+" >>").attr("title",e.message.last_title).appendTo(e.elem.navi_p)),$(e.elem.navi_p).show(),e._ehNaviPaging(e)}else $(e.elem.navi_p).hide()},_setSubInfo:function(e,t){if(e.option.sub_info){e.prop.size_results=($(e.elem.results).outerHeight()-$(e.elem.results).height())/2,e.prop.size_navi=$(e.elem.navi).outerHeight(),e.prop.size_li=$(e.elem.results).children("li:first").outerHeight(),e.prop.size_left=$(e.elem.results).outerWidth();var o=$(e.elem.results).children("li").index(t);$(e.elem.sub_info).children("dl").hide();var s=0;"none"!=$(e.elem.navi).css("display")&&(s+=e.prop.size_navi),s+=e.prop.size_results+e.prop.size_li*o;var n=e.prop.size_left;s+="px",n+="px",$(e.elem.sub_info).children("dl").eq(o).css({position:"absolute",top:s,left:n,display:"block"})}}},m={_displayResults:function(e,t,o,s){$(e.elem.results).empty(),$(e.elem.sub_info).empty();for(var n=0;n<t.length;n++){var i=$("<li>").text(t[n]).attr({pkey:s[n],title:t[n]});if("textarea"!=e.option.plugin_type&&s[n]==$(e.elem.hidden).val()&&$(i).addClass(e.css_class.selected),$(e.elem.results).append(i),o){var a,r,l=[],p=$("<dl>");for(var _ in o[n]){var c=_.replace("'","\\'");null===o[n][_]?o[n][_]="":o[n][_]+="";var u=o[n][_].replace("'","\\'");l.push("'"+c+"':'"+u+"'"),a=e.option.sub_as[_]?e.option.sub_as[_]:_,a=$("<dt>").text(a),"simple"==e.option.sub_info&&$(a).addClass("hide"),p.append(a),r=$("<dd>").text(o[n][_]),p.append(r)}l="{"+l.join(",")+"}",$(i).attr("sub_info",l),$(e.elem.sub_info).append(p),"simple"==e.option.sub_info&&""===p.children("dd").text()&&p.addClass("ac_dl_empty")}}e._calcWidthResults(e),$(e.elem.container).addClass(e.css_class.container_open),e._ehResults(),"combobox"==e.option.plugin_type&&$(e.elem.button).attr("title",e.message.close_btn)},_calcWidthResults:function(e){var t;if(t="combobox"==e.option.plugin_type?$(e.elem.combo_input).outerWidth()+$(e.elem.button).outerWidth():$(e.elem.combo_input).outerWidth(),$(e.elem.container).width(t),"static"==$(e.elem.container).css("position")){var o=$(e.elem.combo_input).offset();$(e.elem.result_area).css({top:o.top+$(e.elem.combo_input).outerHeight()+"px",left:o.left+"px"})}else $(e.elem.result_area).css({top:$(e.elem.combo_input).outerHeight()+"px",left:"0px"});$(e.elem.result_area).width($(e.elem.container).width()-($(e.elem.result_area).outerWidth()-$(e.elem.result_area).innerWidth())).show()},_hideResults:function(e){e.prop.key_paging&&(e._scrollWindow(e,!0),e.prop.key_paging=!1),e._setCssFocusedInput(e),$(e.elem.results).empty(),$(e.elem.sub_info).empty(),$(e.elem.result_area).hide(),$(e.elem.container).removeClass(e.css_class.container_open),e._abortAjax(e),e._setButtonAttrDefault()}},b={_selectCurrentLine:function(e,t){e._scrollWindow(e,!0);var o=e._getCurrentLine(e);if(o){if("textarea"!=e.option.plugin_type)$(e.elem.combo_input).val($(o).text()),e.option.sub_info&&$(e.elem.combo_input).attr("sub_info",$(o).attr("sub_info")),e.option.select_only&&e._setButtonAttrDefault(),$(e.elem.hidden).val($(o).attr("pkey"));else{var s,n,i,a,r=e.prop.prev_value.substring(0,e.prop.tag.pos_left),l=e.prop.prev_value.substring(e.prop.tag.pos_right);s=$(o).text(),e.option.tags[e.prop.tag.type].space[0]&&!r.match(e.option.tags[e.prop.tag.type].pattern.space_left)&&(n=e.option.tags[e.prop.tag.type].pattern.left.length,i=r.length,r=r.substring(0,i-n)+" "+r.substring(i-n)),l.match(e.option.tags[e.prop.tag.type].pattern.comp_right)||(l=e.option.tags[e.prop.tag.type].pattern.right+l),e.option.tags[e.prop.tag.type].space[1]&&!l.match(e.option.tags[e.prop.tag.type].pattern.space_right)&&(n=e.option.tags[e.prop.tag.type].pattern.right.length,l=l.substring(0,n)+" "+l.substring(n)),$(e.elem.combo_input).val(r+""+s+l),a=r.length+s.length,e._setCaretPosition(e,a)}e.prop.prev_value=$(e.elem.combo_input).val(),e._hideResults(e)}e.option.bind_to&&$(e.elem.combo_input).trigger(e.option.bind_to,t),$(e.elem.combo_input).focus(),$(e.elem.combo_input).change(),e._setCssFocusedInput(e)},_getCurrentLine:function(e){if($(e.elem.result_area).is(":hidden"))return!1;var t=$(e.elem.results).children("li."+e.css_class.select);return!!$(t).length&&t}},v={_nextLine:function(e){var t,o=e._getCurrentLine(e);if(o?(t=$(e.elem.results).children("li").index(o),$(o).removeClass(e.css_class.select)):t=-1,++t<$(e.elem.results).children("li").length){var s=$(e.elem.results).children("li").eq(t);e._setSubInfo(e,s),$(s).addClass(e.css_class.select),e._setCssFocusedResults(e)}else e._setCssFocusedInput(e);e._scrollWindow(e,!1)},_prevLine:function(e){var t,o=e._getCurrentLine(e);if(o?(t=$(e.elem.results).children("li").index(o),$(o).removeClass(e.css_class.select)):t=$(e.elem.results).children("li").length,--t>-1){var s=$(e.elem.results).children("li").eq(t);e._setSubInfo(e,s),$(s).addClass(e.css_class.select),e._setCssFocusedResults(e)}else e._setCssFocusedInput(e);e._scrollWindow(e,!1)}};$.fn.ajaxComboBox=function(e,t){var o=[];return this.each(function(){o.push(new $.ajaxComboBox(this,e,t))}),void 0!==t&&void 0!==t.instance&&t.instance?$(o):this},$.ajaxComboBox=function(e,t,o){this.option=this._setOption(t,o),this._setMessage(),this._setCssClass(),this._setProp(),this._setElem(e),this._setButtonAttrDefault(),this._setInitRecord(),this._ehButton(),this._ehComboInput(),this._ehWhole(),this._ehTextArea(),this.option.shorten_btn&&this._findUrlToShorten(this)},$.extend($.ajaxComboBox.prototype,s,{_setMessage:function(){var e;switch(this.option.lang){case"de":e={add_btn:"Hinzufügen-Button",add_title:"Box hinzufügen",del_btn:"Löschen-Button",del_title:"Box löschen",next:"Nächsten",next_title:"Nächsten"+this.option.per_page+" (Pfeil-rechts)",prev:"Vorherigen",prev_title:"Vorherigen"+this.option.per_page+" (Pfeil-links)",first_title:"Ersten (Umschalt + Pfeil-links)",last_title:"Letzten (Umschalt + Pfeil-rechts)",get_all_btn:"alle (Pfeil-runter)",get_all_alt:"(Button)",close_btn:"Schließen (Tab)",close_alt:"(Button)",loading:"lade...",loading_alt:"(lade)",page_info:"num_page_top - num_page_end von cnt_whole",select_ng:"Achtung: Bitte wählen Sie aus der Liste aus.",select_ok:"OK : Richtig ausgewählt.",not_found:"nicht gefunden",ajax_error:"Bei der Verbindung zum Server ist ein Fehler aufgetreten. (ajax-combobox)"};break;case"en":e={add_btn:"Add button",add_title:"add a box",del_btn:"Del button",del_title:"delete a box",next:"Next",next_title:"Next"+this.option.per_page+" (Right key)",prev:"Prev",prev_title:"Prev"+this.option.per_page+" (Left key)",first_title:"First (Shift + Left key)",last_title:"Last (Shift + Right key)",get_all_btn:"Get All (Down key)",get_all_alt:"(button)",close_btn:"Close (Tab key)",close_alt:"(button)",loading:"loading...",loading_alt:"(loading)",page_info:"num_page_top - num_page_end of cnt_whole",select_ng:"Attention : Please choose from among the list.",select_ok:"OK : Correctly selected.",not_found:"not found",ajax_error:"An error occurred while connecting to server. (ajax-combobox)"};break;case"es":e={add_btn:"Agregar boton",add_title:"Agregar una opcion",del_btn:"Borrar boton",del_title:"Borrar una opcion",next:"Siguiente",next_title:"Proximas "+this.option.per_page+" (tecla derecha)",prev:"Anterior",prev_title:"Anteriores "+this.option.per_page+" (tecla izquierda)",first_title:"Primera (Shift + Left)",last_title:"Ultima (Shift + Right)",get_all_btn:"Ver todos (tecla abajo)",get_all_alt:"(boton)",close_btn:"Cerrar (tecla TAB)",close_alt:"(boton)",loading:"Cargando...",loading_alt:"(Cargando)",page_info:"num_page_top - num_page_end de cnt_whole",select_ng:"Atencion: Elija una opcion de la lista.",select_ok:"OK: Correctamente seleccionado.",not_found:"no encuentre",ajax_error:"Un error ocurrió mientras conectando al servidor. (ajax-combobox)"};break;case"pt-br":e={add_btn:"Adicionar botão",add_title:"Adicionar uma caixa",del_btn:"Apagar botão",del_title:"Apagar uma caixa",next:"Próxima",next_title:"Próxima "+this.option.per_page+" (tecla direita)",prev:"Anterior",prev_title:"Anterior "+this.option.per_page+" (tecla esquerda)",first_title:"Primeira (Shift + Left)",last_title:"Última (Shift + Right)",get_all_btn:"Ver todos (Seta para baixo)",get_all_alt:"(botão)",close_btn:"Fechar (tecla TAB)",close_alt:"(botão)",loading:"Carregando...",loading_alt:"(Carregando)",page_info:"num_page_top - num_page_end de cnt_whole",select_ng:"Atenção: Escolha uma opção da lista.",select_ok:"OK: Selecionado Corretamente.",not_found:"não encontrado",ajax_error:"Um erro aconteceu enquanto conectando a servidor. (ajax-combobox)"};break;default:e={add_btn:"追加ボタン",add_title:"入力ボックスを追加します",del_btn:"削除ボタン",del_title:"入力ボックスを削除します",next:"次へ",next_title:"次の"+this.option.per_page+"件 (右キー)",prev:"前へ",prev_title:"前の"+this.option.per_page+"件 (左キー)",first_title:"最初のページへ (Shift + 左キー)",last_title:"最後のページへ (Shift + 右キー)",get_all_btn:"全件取得 (下キー)",get_all_alt:"画像:ボタン",close_btn:"閉じる (Tabキー)",close_alt:"画像:ボタン",loading:"読み込み中...",loading_alt:"画像:読み込み中...",page_info:"num_page_top - num_page_end 件 (全 cnt_whole 件)",select_ng:"注意 : リストの中から選択してください",select_ok:"OK : 正しく選択されました。",not_found:"(0 件)",ajax_error:"サーバとの通信でエラーが発生しました。(ajax-combobox)"}}this.message=e}},n,i,a,r,l,p,_,c,u,d,g,h,f,m,{_firstPage:function(e){e.prop.is_suggest?e.prop.page_suggest>1&&(e.prop.page_suggest=1,e.prop.is_paging=!0,e._suggest(e)):e.prop.page_all>1&&(e.prop.page_all=1,e.prop.is_paging=!0,e._suggest(e))},_prevPage:function(e){e.prop.is_suggest?e.prop.page_suggest>1&&(e.prop.page_suggest--,e.prop.is_paging=!0,e._suggest(e)):e.prop.page_all>1&&(e.prop.page_all--,e.prop.is_paging=!0,e._suggest(e))},_nextPage:function(e){e.prop.is_suggest?e.prop.page_suggest<e.prop.max_suggest&&(e.prop.page_suggest++,e.prop.is_paging=!0,e._suggest(e)):e.prop.page_all<e.prop.max_all&&(e.prop.page_all++,e.prop.is_paging=!0,e._suggest(e))},_lastPage:function(e){e.prop.is_suggest?e.prop.page_suggest<e.prop.max_suggest&&(e.prop.page_suggest=e.prop.max_suggest,e.prop.is_paging=!0,e._suggest(e)):e.prop.page_all<e.prop.max_all&&(e.prop.page_all=e.prop.max_all,e.prop.is_paging=!0,e._suggest(e))}},b,v)}]);
\ No newline at end of file
diff --git a/package.json b/package.json
index 7658c20..d5eea8b 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "jquery.ajax-combobox",
   "description": "jQuery plugin to create a text box which can auto-complete and pull-down-select.",
   "license": "MIT",
-  "version": "7.5.2",
+  "version": "7.5.3",
   "author": "Yuusaku Miyazaki <toumin.m7@gmail.com>",
   "homepage": "https://github.com/sutara79/jquery.ajax-combobox",
   "main": "dist/jquery.ajax-combobox.min.js",
diff --git a/sample/basic.html b/sample/basic.html
index ddf38ef..cf42954 100644
--- a/sample/basic.html
+++ b/sample/basic.html
@@ -233,7 +233,7 @@ <h5 class="card-header">
   'jquery.ajax-combobox.php',
   {
     <span class="green">order_by</span>: [
-      'name DESC', // ASC or DESC
+      'name DESC', // ASC or DESC should be UPPERCASE.
       'created'
     ]
   }
diff --git a/sample/text-area.html b/sample/text-area.html
index c646414..859ad89 100644
--- a/sample/text-area.html
+++ b/sample/text-area.html
@@ -290,7 +290,7 @@ <h5 class="card-header">
       {
         pattern: ['@', ''],
         db_table: 'tag',
-        <span class="green">order_by</span>: 'name DESC'
+        <span class="green">order_by</span>: 'name DESC' // ASC or DESC should be UPPERCASE.
       }
     ]
   }
diff --git a/src/method/03-_setOption.js b/src/method/03-_setOption.js
index fbcc9e3..3be8ef4 100644
--- a/src/method/03-_setOption.js
+++ b/src/method/03-_setOption.js
@@ -245,26 +245,25 @@ export default {
    * Adjust an array of "ORDER BY" to use it in the code.
    *
    * @private
-   * @arg {Array} arg_order - Array of "ORDER BY" (not have processed).
-   * @arg {string} arg_field - Field to search.
+   * @arg {Array|string} orders - Array of "ORDER BY" (not have processed).
+   * @arg {string} field - Field to search.
    * @return {Array} - Array of "ORDER BY" (have processed).
    */
-  _setOrderbyOption: function(arg_order, arg_field) {
-    var arr = [];
-    var orders = [];
-    if (typeof arg_order == 'object') {
-      for (var i = 0; i < arg_order.length; i++) {
-        orders = $.trim(arg_order[i]).split(' ');
-        arr[i] =  (orders.length == 2) ? orders : [orders[0], 'ASC'];
-      }
-    } else {
-      orders = $.trim(arg_order).split(' ');
-      arr[0] = (orders.length == 2) ?
-        orders :
-        (orders[0].match(/^(ASC|DESC)$/i)) ?
-          [arg_field, orders[0]] :
-          [orders[0], 'ASC'];
+  _setOrderbyOption: function(orders, field) {
+    if (typeof orders == 'string') orders = new Array(orders);
+
+    var result = [];
+    var arrSplit = [];
+
+    for (var i = 0; i < orders.length; i++) {
+      arrSplit = $.trim(orders[i]).split(/ +/);
+      result[i] = (arrSplit.length == 2) ?
+        arrSplit :
+        (arrSplit[0].match(/^(ASC|DESC)$/i)) ? // In the future, lowercase "asc" or "desc" are judged to be field names.
+          [field, arrSplit[0]] :
+          [arrSplit[0], 'ASC'];
     }
-    return arr;
+
+    return result;
   }
 };
\ No newline at end of file
diff --git a/test/js/unit/index.html b/test/js/unit/index.html
index 9658004..322603b 100644
--- a/test/js/unit/index.html
+++ b/test/js/unit/index.html
@@ -25,6 +25,7 @@
 <script src="jQuery.fn/ajaxComboBox.js"></script>
 <script src="jQuery.ajaxComboBox/setOption.js"></script>
 <script src="jQuery.ajaxComboBox/strToArray.js"></script>
+<script src="jQuery.ajaxComboBox/setOrderbyOption.js"></script>
 
 <script>
 mocha.run(function (err) {
diff --git a/test/js/unit/jQuery.ajaxComboBox/setOrderbyOption.js b/test/js/unit/jQuery.ajaxComboBox/setOrderbyOption.js
new file mode 100644
index 0000000..d1a8c66
--- /dev/null
+++ b/test/js/unit/jQuery.ajaxComboBox/setOrderbyOption.js
@@ -0,0 +1,60 @@
+/**
+ * @file Unit Testing
+ */
+describe('$.ajaxComboBox._setOrderbyOption', () => {
+  it('should convert strings to array', () => {
+    const orders = 'field1 ASC';
+    const field = 'field999';
+    const result = $.ajaxComboBox.prototype._setOrderbyOption(orders, field);
+    assert.equal(result[0][0], 'field1');
+    assert.equal(result[0][1], 'ASC');
+  });
+
+  it('should accept multiple space', () => {
+    const orders = 'field1     DESC';
+    const field = 'field999';
+    const result = $.ajaxComboBox.prototype._setOrderbyOption(orders, field);
+    assert.equal(result[0][0], 'field1');
+    assert.equal(result[0][1], 'DESC');
+  });
+
+  it('should complement a field name', () => {
+    const orders = 'ASC';
+    const field = 'field999';
+    const result = $.ajaxComboBox.prototype._setOrderbyOption(orders, field);
+    assert.equal(result[0][0], 'field999');
+    assert.equal(result[0][1], 'ASC');
+  });
+
+  it('should accept lowercase "asc" or "desc"', () => {
+    // In the future, lowercase "asc" or "desc" are judged to be field names.
+
+    const orders = 'desc';
+    const field = 'field999';
+    const result = $.ajaxComboBox.prototype._setOrderbyOption(orders, field);
+    assert.equal(result[0][0], 'field999');
+    assert.equal(result[0][1], 'desc');
+  });
+
+  it('should accept an array', () => {
+    const orders = [
+      'field1',
+      'field2 DESC',
+      'field3     ASC',
+      'DESC'
+    ];
+    const field = 'field999';
+    const result = $.ajaxComboBox.prototype._setOrderbyOption(orders, field);
+    assert.equal(result[0][0], 'field1');
+    assert.equal(result[0][1], 'ASC');
+
+    assert.equal(result[1][0], 'field2');
+    assert.equal(result[1][1], 'DESC');
+
+    assert.equal(result[2][0], 'field3');
+    assert.equal(result[2][1], 'ASC');
+
+    assert.equal(result[3][0], 'field999');
+    assert.equal(result[3][1], 'DESC');
+  });
+});
\ No newline at end of file