diff --git a/dist/js/tableexport.js b/dist/js/tableexport.js
index 7e05545..4e481a0 100644
--- a/dist/js/tableexport.js
+++ b/dist/js/tableexport.js
@@ -18,7 +18,7 @@
     }
 }(this, function ($, Blob, saveAs, XLSX) {
         'use strict';
-        // TODO: update typings (def file)
+        // TODO: update TS `definition` file
         /**
          * TableExport main library constructor
          * @param selectors {jQuery} jQuery selector(s)
@@ -90,12 +90,26 @@
                     };
                 })();
 
+                var formatMap = {};
+                for (var type in _type) {
+                    formatMap[type] = 0;
+                }
 
                 settings.formats.forEach(
                     function (key) {
-                        XLSX && !isMobile && key === 'xls' ? key = 'xlsm' : false;
-                        !XLSX || isMobile && key === 'xlsx' ? key = null : false;
-                        key && context.setExportData(self.exporters[key].call(self, context));
+                        var before = key;
+                        (XLSX && !isMobile) && key === _type.xls
+                            ? key = _type.xlsm
+                            : false;
+
+                        (!XLSX || isMobile) && key === _type.xlsx
+                            ? key = _type.xls
+                            : false;
+
+                        if (!formatMap[key]) {
+                            context.setExportData(self.exporters[key].call(self, context));
+                            formatMap[key]++;
+                        }
                     }
                 );
             });
@@ -288,12 +302,12 @@
                                     t: self.getType(val.className)
                                 };
                             }).filter(function (val) {
-                                return val;
+                                return typeof val !== 'undefined';
                             });
                         }).map(function (val) {
                             return val && [].concat.apply([], val);
                         }).filter(function (val) {
-                            return val;
+                            return typeof val !== 'undefined';
                         }),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -304,7 +318,7 @@
                             })),
                         myContent = TableExport.prototype.xlsx.buttonContent,
                         myClass = TableExport.prototype.xlsx.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xlsx'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xlsx}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -363,12 +377,12 @@
                                     t: self.getType(val.className)
                                 };
                             }).filter(function (val) {
-                                return val;
+                                return typeof val !== 'undefined';
                             });
                         }).map(function (val) {
                             return val && [].concat.apply([], val);
                         }).filter(function (val) {
-                            return val;
+                            return typeof val !== 'undefined';
                         }),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -379,7 +393,7 @@
                             })),
                         myContent = TableExport.prototype.xls.buttonContent,
                         myClass = TableExport.prototype.xls.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xls'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xls}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -407,9 +421,12 @@
                                 if (_hasClass(val, settings.emptyCSS)) {
                                     return ' '
                                 }
-
                                 return val.textContent;
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -420,7 +437,7 @@
                             })),
                         myContent = TableExport.prototype.xls.buttonContent,
                         myClass = TableExport.prototype.xls.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xls'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xls}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -450,7 +467,11 @@
                                     return ' '
                                 }
                                 return '"' + settings.formatValue(val.textContent.replace(/"/g, '""')) + '"';
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -461,7 +482,7 @@
                             })),
                         myContent = TableExport.prototype.csv.buttonContent,
                         myClass = TableExport.prototype.csv.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'csv'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.csv}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -473,7 +494,6 @@
                     _store.getInstance().setItem(hashKey, dataObject, true);
                     return hashKey;
                 },
-                // TODO: bug with `txt` ignoreRows and ignoreCols
                 txt: function (context) {
                     var self = this;
                     var settings = self.settings;
@@ -491,7 +511,11 @@
                                     return ' '
                                 }
                                 return settings.formatValue(val.textContent);
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -502,7 +526,7 @@
                             })),
                         myContent = TableExport.prototype.txt.buttonContent,
                         myClass = TableExport.prototype.txt.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'txt'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.txt}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -787,6 +811,17 @@
             };
         })();
 
+        var _type = (function () {
+            return {
+                xlsx: 'xlsx',
+                xlsm: 'xlsm',
+                xls: 'xls',
+                csv: 'csv',
+                txt: 'txt'
+            };
+        })();
+
+
         var _hashCode = (function () {
             var hash = 0, i, char;
 
@@ -827,8 +862,14 @@
         }
 
         function _nodesArray(els) {
-            if (!(els instanceof NodeList) && (!$ || !(els instanceof $))) return [].concat(els);
-            return [].slice.call(els)
+            var result;
+            try {
+                result = [].slice.call(els);
+                if (!result.length) throw Error();
+            } catch (e) {
+                result = [].concat(els);
+            }
+            return result;
         }
 
         function _hasClass(el, cls) {
@@ -866,7 +907,6 @@
 
             // alias the TableExport prototype
             for (var prop in TableExport.prototype) {
-                // TODO: check compat
                 $.fn.tableExport[prop] = TableExport.prototype[prop];
             }
         }
diff --git a/dist/js/tableexport.min.js b/dist/js/tableexport.min.js
index 7ade925..e99cad4 100644
--- a/dist/js/tableexport.min.js
+++ b/dist/js/tableexport.min.js
@@ -3,4 +3,4 @@
  * Copyright 2017 Travis Clarke
  * Licensed under the MIT license
  */
-!function(t,e){"function"==typeof define&&define.amd?define(["jquery","blobjs","file-saverjs","xlsx"],e):"object"==typeof exports&&"string"!=typeof exports.nodeName?module.exports=e(require("jquery"),require("blobjs"),require("file-saverjs"),require("xlsx")):t.TableExport=e(t.jQuery,t.Blob,t.saveAs,t.XLSX)}(this,function(t,e,r,o){"use strict";function n(){for(var t=arguments,e=1;e<t.length;e++)for(var r in t[e])t[e].hasOwnProperty(r)&&(t[0][r]=t[e][r]);return t[0]}function i(e){return e instanceof NodeList||t&&e instanceof t?[].slice.call(e):[].concat(e)}function a(t,e){return t.classList?t.classList.contains(e):new RegExp("(^| )"+e+"( |$)","gi").test(t.cls)}function s(t,e,r){var o={};return t?(o.bootstrapClass=e[0]+" ",o.bootstrapTheme=e[1]+" ",o.bootstrapSpacing=e[2]+" "):(o.bootstrapClass=r+" ",o.bootstrapTheme="",o.bootstrapSpacing=""),o}var l=function(t,e){var r=this;if(!t)return new Error('"selectors" is required');if(!r)return new l(t,e);r.settings=n({},r.defaults,e),r.selectors=i(t);var a=r.settings;a.ignoreRows=a.ignoreRows instanceof Array?a.ignoreRows:[a.ignoreRows],a.ignoreCols=a.ignoreCols instanceof Array?a.ignoreCols:[a.ignoreCols],a.ignoreCSS=r.ignoreCSS instanceof Array?r.ignoreCSS.join(", "):r.ignoreCSS,a.emptyCSS=r.emptyCSS instanceof Array?r.emptyCSS.join(", "):r.emptyCSS,a.formatValue=r.formatValue.bind(this,a.trimWhitespace),a.bootstrapSettings=s(a.bootstrap,r.bootstrapConfig,r.defaultButton);var c={};r.getExportData=function(){return c},r.selectors.forEach(function(t){var e={};e.rows=i(t.querySelectorAll("tbody > tr")),e.rows=a.headers?i(t.querySelectorAll("thead > tr")).concat(e.rows):e.rows,e.rows=a.footers?e.rows.concat(i(t.querySelectorAll("tfoot > tr"))):e.rows,e.thAdj=a.headers?t.querySelectorAll("thead > tr").length:0,e.filename="id"===a.filename?t.getAttribute("id")?t.getAttribute("id"):r.defaultFilename:a.filename?a.filename:r.defaultFilename,e.uuid=u(t),e.checkCaption=function(e){var r=t.querySelectorAll("caption.tableexport-caption");r.length?r[0].appendChild(e):(r=document.createElement("caption"),r.className=a.bootstrapSettings.bootstrapSpacing+a.position+" tableexport-caption",r.appendChild(e),t.insertBefore(r,t.firstChild))},e.setExportData=function(){return function(t){var r=p.getInstance().getItem(t),o=t.substring(t.indexOf("-")+1);c[e.uuid]=c[e.uuid]||{},c[e.uuid][o]=JSON.parse(r)}}(),a.formats.forEach(function(t){!(!o||m||"xls"!==t)&&(t="xlsm"),!(o&&(!m||"xlsx"!==t))&&(t=null),t&&e.setExportData(r.exporters[t].call(r,e))})});var d=document.querySelectorAll("button[tableexport-id]");return f(d,"click",r.downloadHandler,r),r};l.prototype={version:"4.0.0",defaults:{headers:!0,footers:!0,formats:["xls","csv","txt"],filename:"id",bootstrap:!1,exportButtons:!0,position:"bottom",ignoreRows:null,ignoreCols:null,trimWhitespace:!0},charset:"charset=utf-8",defaultFilename:"myDownload",defaultButton:"button-default",ignoreCSS:"tableexport-ignore",emptyCSS:"tableexport-empty",bootstrapConfig:["btn","btn-default","btn-toolbar"],rowDel:"\r\n",entityMap:{"&":"&#38;","<":"&#60;",">":"&#62;","'":"&#39;","/":"&#47;"},xlsx:{defaultClass:"xlsx",buttonContent:"Export to xlsx",mimeType:"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",fileExtension:".xlsx"},xls:{defaultClass:"xls",buttonContent:"Export to xls",separator:"\t",mimeType:"application/vnd.ms-excel",fileExtension:".xls"},csv:{defaultClass:"csv",buttonContent:"Export to csv",separator:",",mimeType:"text/csv",fileExtension:".csv"},txt:{defaultClass:"txt",buttonContent:"Export to txt",separator:"  ",mimeType:"text/plain",fileExtension:".txt"},types:{string:{defaultClass:"tableexport-string"},number:{defaultClass:"tableexport-number",assert:function(t){return!isNaN(t)}},"boolean":{defaultClass:"tableexport-boolean",assert:function(t){return"true"===t.toLowerCase()||"false"===t.toLowerCase()}},date:{defaultClass:"tableexport-date",assert:function(t){return!/.*%/.test(t)&&!isNaN(Date.parse(t))}}},exporters:{xlsx:function(t){var e=this,r=e.settings,o={},n=i(t.rows).map(function(n,s){if(!~r.ignoreRows.indexOf(s-t.thAdj)&&!a(n,r.ignoreCSS)){var l=n.querySelectorAll("th, td");return i(l).map(function(t,n){if(!~r.ignoreCols.indexOf(n)&&!a(t,r.ignoreCSS)){if(a(t,r.emptyCSS))return" ";if(t.hasAttribute("colspan")&&(o[s]=o[s]||{},o[s][n+1]=t.getAttribute("colspan")-1),t.hasAttribute("rowspan"))for(var i=1;i<t.getAttribute("rowspan");i++)o[s+i]=o[s+i]||{},o[s+i][n]=1;if(o[s]){for(var l=n+1,p=0,u=0,i=0;i<=Math.max.apply(Math,Object.keys(o[s]))&&(o[s][i]?p=u>=n?p+o[s][i]:p:u++,u!==l);i++);return new Array(p).concat({v:r.formatValue(t.textContent),t:e.getType(t.className)})}return{v:r.formatValue(t.textContent),t:e.getType(t.className)}}}).filter(function(t){return t})}}).map(function(t){return t&&[].concat.apply([],t)}).filter(function(t){return t}),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xlsx.mimeType,fileExtension:l.prototype.xlsx.fileExtension})),u=l.prototype.xlsx.buttonContent,f=l.prototype.xlsx.defaultClass,m=c({uuid:t.uuid,type:"xlsx"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},xlsm:function(t){var e=this,r=e.settings,o={},n=i(t.rows).map(function(n,s){if(!~r.ignoreRows.indexOf(s-t.thAdj)&&!a(n,r.ignoreCSS)){var l=n.querySelectorAll("th, td");return i(l).map(function(t,n){if(!~r.ignoreCols.indexOf(n)&&!a(t,r.ignoreCSS)){if(a(t,r.emptyCSS))return" ";if(t.hasAttribute("colspan")&&(o[s]=o[s]||{},o[s][n+1]=t.getAttribute("colspan")-1),t.hasAttribute("rowspan"))for(var i=1;i<t.getAttribute("rowspan");i++)o[s+i]=o[s+i]||{},o[s+i][n]=1;if(o[s]){for(var l=n+1,p=0,u=0,i=0;i<=Math.max.apply(Math,Object.keys(o[s]))&&(o[s][i]?p=u>=n?p+o[s][i]:p:u++,u!==l);i++);return new Array(p).concat({v:r.formatValue(t.textContent),t:e.getType(t.className)})}return{v:r.formatValue(t.textContent),t:e.getType(t.className)}}}).filter(function(t){return t})}}).map(function(t){return t&&[].concat.apply([],t)}).filter(function(t){return t}),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xls.mimeType,fileExtension:l.prototype.xls.fileExtension})),u=l.prototype.xls.buttonContent,f=l.prototype.xls.defaultClass,m=c({uuid:t.uuid,type:"xls"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},xls:function(t){var e=this,r=e.settings,o=l.prototype.xls.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":t.textContent}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xls.mimeType,fileExtension:l.prototype.xls.fileExtension})),u=l.prototype.xls.buttonContent,f=l.prototype.xls.defaultClass,m=c({uuid:t.uuid,type:"xls"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},csv:function(t){var e=this,r=e.settings,o=l.prototype.csv.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":'"'+r.formatValue(t.textContent.replace(/"/g,'""'))+'"'}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.csv.mimeType,fileExtension:l.prototype.csv.fileExtension})),u=l.prototype.csv.buttonContent,f=l.prototype.csv.defaultClass,m=c({uuid:t.uuid,type:"csv"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},txt:function(t){var e=this,r=e.settings,o=l.prototype.txt.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":r.formatValue(t.textContent)}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.txt.mimeType,fileExtension:l.prototype.txt.fileExtension})),u=l.prototype.txt.buttonContent,f=l.prototype.txt.defaultClass,m=c({uuid:t.uuid,type:"txt"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m}},createObjButton:function(t,e,r,o,n){var i=document.createElement("button");return i.setAttribute("tableexport-id",t),i.className=n.bootstrapClass+n.bootstrapTheme+o,i.textContent=r,i},escapeHtml:function(t){return String(t).replace(/[&<>'\/]/g,function(t){return l.prototype.entityMap[t]})},translateMimeType:function(t){return String(t).replace(/&#47;/,"/").replace(this.xls.mimeType,this.csv.mimeType)},formatValue:function(t,e){return t?e.trim():e},getType:function(t){if(!t)return"";var e=l.prototype.types;return~t.indexOf(e.string.defaultClass)?"s":~t.indexOf(e.number.defaultClass)?"n":~t.indexOf(e["boolean"].defaultClass)?"b":~t.indexOf(e.date.defaultClass)?"d":""},dateNum:function(t,e){e&&(t+=1462);var r=Date.parse(t);return(r-new Date(Date.UTC(1899,11,30)))/864e5},createSheet:function(t){for(var e={},r={s:{c:1e7,r:1e7},e:{c:0,r:0}},n=l.prototype.types,i=0;i!==t.length;++i)for(var a=0;a!==t[i].length;++a){r.s.r>i&&(r.s.r=i),r.s.c>a&&(r.s.c=a),r.e.r<i&&(r.e.r=i),r.e.c<a&&(r.e.c=a);var s=t[i][a];if(s&&s.v){var p=o.utils.encode_cell({c:a,r:i});s.t||(n.number.assert(s.v)?s.t="n":n["boolean"].assert(s.v)?s.t="b":n.date.assert(s.v)?s.t="d":s.t="s"),"d"===s.t&&(s.t="n",s.z=o.SSF._table[14],s.v=this.dateNum(s.v)),e[p]=s}}return r.s.c<1e7&&(e["!ref"]=o.utils.encode_range(r)),e},downloadHandler:function(t){var e=t.target,r=JSON.parse(p.getInstance().getItem(e.getAttribute("tableexport-id"))),o=r.data,n=r.filename,i=r.mimeType,a=r.fileExtension;this.export2file(o,i,n,a)},Workbook:function(){this.SheetNames=[],this.Sheets={}},string2ArrayBuffer:function(t){for(var e=new ArrayBuffer(t.length),r=new Uint8Array(e),o=0;o!==t.length;++o)r[o]=255&t.charCodeAt(o);return e},export2file:function(t,n,i,a){if(o&&!m&&".xls"===a.substr(0,4)){var s=new this.Workbook,l=this.createSheet(t);s.SheetNames.push(i),s.Sheets[i]=l;var p={bookType:a.substr(1,3)+(a.substr(4)||"m"),bookSST:!1,type:"binary"},u=o.write(s,p);t=this.string2ArrayBuffer(u)}if(m){var c="data:"+this.translateMimeType(n)+";"+this.charset+","+t;this.downloadDataURI(c,i,a)}else r(new e([t],{type:n+";"+this.charset}),i+a,!0)},downloadDataURI:function(t,e,r){var o=encodeURI(t),n=document.createElement("a");n.setAttribute("href",o),n.setAttribute("download",e+r),document.body.appendChild(n),n.click()},update:function(t){return 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u),u._instance}}();var p=function(){var t=0;return function(e){return e.id||(e.id="tableexport-"+ ++t),e.id}}(),c=function(){return{xlsx:"xlsx",xlsm:"xlsm",xls:"xls",csv:"csv",txt:"txt"}}(),f=function(){var t,e,n=0;return function(r){var o=r.type;if(r=JSON.stringify(r),0===r.length)return n;for(t=0;t<r.length;t++)e=r.charCodeAt(t),n=(n<<5)-n+e,n|=0;return n.toString(16).substring(1)+"-"+o}}(),m=function(){var t=null;return function(e,n,r,o){for(var i=r.bind(o),a=0;a<e.length;++a)t&&e[a].removeEventListener(n,t,!1),e[a].addEventListener(n,i,!1);t=i}}(),d=function(t){return/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(t)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a 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)|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(t.substr(0,4))}(navigator.userAgent||navigator.vendor||window.opera);if(t){t.fn.tableExport=function(t){return new l(this,t)};for(var x in l.prototype)t.fn.tableExport[x]=l.prototype[x]}return l});
\ No newline at end of file
diff --git a/src/stable/js/tableexport.js b/src/stable/js/tableexport.js
index 7e05545..4e481a0 100644
--- a/src/stable/js/tableexport.js
+++ b/src/stable/js/tableexport.js
@@ -18,7 +18,7 @@
     }
 }(this, function ($, Blob, saveAs, XLSX) {
         'use strict';
-        // TODO: update typings (def file)
+        // TODO: update TS `definition` file
         /**
          * TableExport main library constructor
          * @param selectors {jQuery} jQuery selector(s)
@@ -90,12 +90,26 @@
                     };
                 })();
 
+                var formatMap = {};
+                for (var type in _type) {
+                    formatMap[type] = 0;
+                }
 
                 settings.formats.forEach(
                     function (key) {
-                        XLSX && !isMobile && key === 'xls' ? key = 'xlsm' : false;
-                        !XLSX || isMobile && key === 'xlsx' ? key = null : false;
-                        key && context.setExportData(self.exporters[key].call(self, context));
+                        var before = key;
+                        (XLSX && !isMobile) && key === _type.xls
+                            ? key = _type.xlsm
+                            : false;
+
+                        (!XLSX || isMobile) && key === _type.xlsx
+                            ? key = _type.xls
+                            : false;
+
+                        if (!formatMap[key]) {
+                            context.setExportData(self.exporters[key].call(self, context));
+                            formatMap[key]++;
+                        }
                     }
                 );
             });
@@ -288,12 +302,12 @@
                                     t: self.getType(val.className)
                                 };
                             }).filter(function (val) {
-                                return val;
+                                return typeof val !== 'undefined';
                             });
                         }).map(function (val) {
                             return val && [].concat.apply([], val);
                         }).filter(function (val) {
-                            return val;
+                            return typeof val !== 'undefined';
                         }),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -304,7 +318,7 @@
                             })),
                         myContent = TableExport.prototype.xlsx.buttonContent,
                         myClass = TableExport.prototype.xlsx.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xlsx'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xlsx}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -363,12 +377,12 @@
                                     t: self.getType(val.className)
                                 };
                             }).filter(function (val) {
-                                return val;
+                                return typeof val !== 'undefined';
                             });
                         }).map(function (val) {
                             return val && [].concat.apply([], val);
                         }).filter(function (val) {
-                            return val;
+                            return typeof val !== 'undefined';
                         }),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -379,7 +393,7 @@
                             })),
                         myContent = TableExport.prototype.xls.buttonContent,
                         myClass = TableExport.prototype.xls.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xls'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xls}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -407,9 +421,12 @@
                                 if (_hasClass(val, settings.emptyCSS)) {
                                     return ' '
                                 }
-
                                 return val.textContent;
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -420,7 +437,7 @@
                             })),
                         myContent = TableExport.prototype.xls.buttonContent,
                         myClass = TableExport.prototype.xls.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'xls'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.xls}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -450,7 +467,11 @@
                                     return ' '
                                 }
                                 return '"' + settings.formatValue(val.textContent.replace(/"/g, '""')) + '"';
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -461,7 +482,7 @@
                             })),
                         myContent = TableExport.prototype.csv.buttonContent,
                         myClass = TableExport.prototype.csv.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'csv'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.csv}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -473,7 +494,6 @@
                     _store.getInstance().setItem(hashKey, dataObject, true);
                     return hashKey;
                 },
-                // TODO: bug with `txt` ignoreRows and ignoreCols
                 txt: function (context) {
                     var self = this;
                     var settings = self.settings;
@@ -491,7 +511,11 @@
                                     return ' '
                                 }
                                 return settings.formatValue(val.textContent);
+                            }).filter(function (val) {
+                                return typeof val !== 'undefined';
                             }).join(colD);
+                        }).filter(function (val) {
+                            return typeof val !== 'undefined';
                         }).join(self.rowDel),
                         dataObject = TableExport.prototype.escapeHtml(
                             JSON.stringify({
@@ -502,7 +526,7 @@
                             })),
                         myContent = TableExport.prototype.txt.buttonContent,
                         myClass = TableExport.prototype.txt.defaultClass,
-                        hashKey = _hashCode({uuid: context.uuid, type: 'txt'}),
+                        hashKey = _hashCode({uuid: context.uuid, type: _type.txt}),
                         exportButton = settings.exportButtons && TableExport.prototype.createObjButton(
                                 hashKey,
                                 dataObject,
@@ -787,6 +811,17 @@
             };
         })();
 
+        var _type = (function () {
+            return {
+                xlsx: 'xlsx',
+                xlsm: 'xlsm',
+                xls: 'xls',
+                csv: 'csv',
+                txt: 'txt'
+            };
+        })();
+
+
         var _hashCode = (function () {
             var hash = 0, i, char;
 
@@ -827,8 +862,14 @@
         }
 
         function _nodesArray(els) {
-            if (!(els instanceof NodeList) && (!$ || !(els instanceof $))) return [].concat(els);
-            return [].slice.call(els)
+            var result;
+            try {
+                result = [].slice.call(els);
+                if (!result.length) throw Error();
+            } catch (e) {
+                result = [].concat(els);
+            }
+            return result;
         }
 
         function _hasClass(el, cls) {
@@ -866,7 +907,6 @@
 
             // alias the TableExport prototype
             for (var prop in TableExport.prototype) {
-                // TODO: check compat
                 $.fn.tableExport[prop] = TableExport.prototype[prop];
             }
         }
diff --git a/src/stable/js/tableexport.min.js b/src/stable/js/tableexport.min.js
index 7ade925..e99cad4 100644
--- a/src/stable/js/tableexport.min.js
+++ b/src/stable/js/tableexport.min.js
@@ -3,4 +3,4 @@
  * Copyright 2017 Travis Clarke
  * Licensed under the MIT license
  */
-!function(t,e){"function"==typeof define&&define.amd?define(["jquery","blobjs","file-saverjs","xlsx"],e):"object"==typeof exports&&"string"!=typeof exports.nodeName?module.exports=e(require("jquery"),require("blobjs"),require("file-saverjs"),require("xlsx")):t.TableExport=e(t.jQuery,t.Blob,t.saveAs,t.XLSX)}(this,function(t,e,r,o){"use strict";function n(){for(var t=arguments,e=1;e<t.length;e++)for(var r in t[e])t[e].hasOwnProperty(r)&&(t[0][r]=t[e][r]);return t[0]}function i(e){return e instanceof NodeList||t&&e instanceof t?[].slice.call(e):[].concat(e)}function a(t,e){return t.classList?t.classList.contains(e):new RegExp("(^| )"+e+"( |$)","gi").test(t.cls)}function s(t,e,r){var o={};return t?(o.bootstrapClass=e[0]+" ",o.bootstrapTheme=e[1]+" ",o.bootstrapSpacing=e[2]+" "):(o.bootstrapClass=r+" ",o.bootstrapTheme="",o.bootstrapSpacing=""),o}var l=function(t,e){var r=this;if(!t)return new Error('"selectors" is required');if(!r)return new l(t,e);r.settings=n({},r.defaults,e),r.selectors=i(t);var a=r.settings;a.ignoreRows=a.ignoreRows instanceof Array?a.ignoreRows:[a.ignoreRows],a.ignoreCols=a.ignoreCols instanceof Array?a.ignoreCols:[a.ignoreCols],a.ignoreCSS=r.ignoreCSS instanceof Array?r.ignoreCSS.join(", "):r.ignoreCSS,a.emptyCSS=r.emptyCSS instanceof Array?r.emptyCSS.join(", "):r.emptyCSS,a.formatValue=r.formatValue.bind(this,a.trimWhitespace),a.bootstrapSettings=s(a.bootstrap,r.bootstrapConfig,r.defaultButton);var c={};r.getExportData=function(){return c},r.selectors.forEach(function(t){var e={};e.rows=i(t.querySelectorAll("tbody > tr")),e.rows=a.headers?i(t.querySelectorAll("thead > tr")).concat(e.rows):e.rows,e.rows=a.footers?e.rows.concat(i(t.querySelectorAll("tfoot > tr"))):e.rows,e.thAdj=a.headers?t.querySelectorAll("thead > tr").length:0,e.filename="id"===a.filename?t.getAttribute("id")?t.getAttribute("id"):r.defaultFilename:a.filename?a.filename:r.defaultFilename,e.uuid=u(t),e.checkCaption=function(e){var r=t.querySelectorAll("caption.tableexport-caption");r.length?r[0].appendChild(e):(r=document.createElement("caption"),r.className=a.bootstrapSettings.bootstrapSpacing+a.position+" tableexport-caption",r.appendChild(e),t.insertBefore(r,t.firstChild))},e.setExportData=function(){return function(t){var r=p.getInstance().getItem(t),o=t.substring(t.indexOf("-")+1);c[e.uuid]=c[e.uuid]||{},c[e.uuid][o]=JSON.parse(r)}}(),a.formats.forEach(function(t){!(!o||m||"xls"!==t)&&(t="xlsm"),!(o&&(!m||"xlsx"!==t))&&(t=null),t&&e.setExportData(r.exporters[t].call(r,e))})});var d=document.querySelectorAll("button[tableexport-id]");return f(d,"click",r.downloadHandler,r),r};l.prototype={version:"4.0.0",defaults:{headers:!0,footers:!0,formats:["xls","csv","txt"],filename:"id",bootstrap:!1,exportButtons:!0,position:"bottom",ignoreRows:null,ignoreCols:null,trimWhitespace:!0},charset:"charset=utf-8",defaultFilename:"myDownload",defaultButton:"button-default",ignoreCSS:"tableexport-ignore",emptyCSS:"tableexport-empty",bootstrapConfig:["btn","btn-default","btn-toolbar"],rowDel:"\r\n",entityMap:{"&":"&#38;","<":"&#60;",">":"&#62;","'":"&#39;","/":"&#47;"},xlsx:{defaultClass:"xlsx",buttonContent:"Export to xlsx",mimeType:"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",fileExtension:".xlsx"},xls:{defaultClass:"xls",buttonContent:"Export to xls",separator:"\t",mimeType:"application/vnd.ms-excel",fileExtension:".xls"},csv:{defaultClass:"csv",buttonContent:"Export to csv",separator:",",mimeType:"text/csv",fileExtension:".csv"},txt:{defaultClass:"txt",buttonContent:"Export to txt",separator:"  ",mimeType:"text/plain",fileExtension:".txt"},types:{string:{defaultClass:"tableexport-string"},number:{defaultClass:"tableexport-number",assert:function(t){return!isNaN(t)}},"boolean":{defaultClass:"tableexport-boolean",assert:function(t){return"true"===t.toLowerCase()||"false"===t.toLowerCase()}},date:{defaultClass:"tableexport-date",assert:function(t){return!/.*%/.test(t)&&!isNaN(Date.parse(t))}}},exporters:{xlsx:function(t){var e=this,r=e.settings,o={},n=i(t.rows).map(function(n,s){if(!~r.ignoreRows.indexOf(s-t.thAdj)&&!a(n,r.ignoreCSS)){var l=n.querySelectorAll("th, td");return i(l).map(function(t,n){if(!~r.ignoreCols.indexOf(n)&&!a(t,r.ignoreCSS)){if(a(t,r.emptyCSS))return" ";if(t.hasAttribute("colspan")&&(o[s]=o[s]||{},o[s][n+1]=t.getAttribute("colspan")-1),t.hasAttribute("rowspan"))for(var i=1;i<t.getAttribute("rowspan");i++)o[s+i]=o[s+i]||{},o[s+i][n]=1;if(o[s]){for(var l=n+1,p=0,u=0,i=0;i<=Math.max.apply(Math,Object.keys(o[s]))&&(o[s][i]?p=u>=n?p+o[s][i]:p:u++,u!==l);i++);return new Array(p).concat({v:r.formatValue(t.textContent),t:e.getType(t.className)})}return{v:r.formatValue(t.textContent),t:e.getType(t.className)}}}).filter(function(t){return t})}}).map(function(t){return t&&[].concat.apply([],t)}).filter(function(t){return t}),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xlsx.mimeType,fileExtension:l.prototype.xlsx.fileExtension})),u=l.prototype.xlsx.buttonContent,f=l.prototype.xlsx.defaultClass,m=c({uuid:t.uuid,type:"xlsx"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},xlsm:function(t){var e=this,r=e.settings,o={},n=i(t.rows).map(function(n,s){if(!~r.ignoreRows.indexOf(s-t.thAdj)&&!a(n,r.ignoreCSS)){var l=n.querySelectorAll("th, td");return i(l).map(function(t,n){if(!~r.ignoreCols.indexOf(n)&&!a(t,r.ignoreCSS)){if(a(t,r.emptyCSS))return" ";if(t.hasAttribute("colspan")&&(o[s]=o[s]||{},o[s][n+1]=t.getAttribute("colspan")-1),t.hasAttribute("rowspan"))for(var i=1;i<t.getAttribute("rowspan");i++)o[s+i]=o[s+i]||{},o[s+i][n]=1;if(o[s]){for(var l=n+1,p=0,u=0,i=0;i<=Math.max.apply(Math,Object.keys(o[s]))&&(o[s][i]?p=u>=n?p+o[s][i]:p:u++,u!==l);i++);return new Array(p).concat({v:r.formatValue(t.textContent),t:e.getType(t.className)})}return{v:r.formatValue(t.textContent),t:e.getType(t.className)}}}).filter(function(t){return t})}}).map(function(t){return t&&[].concat.apply([],t)}).filter(function(t){return t}),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xls.mimeType,fileExtension:l.prototype.xls.fileExtension})),u=l.prototype.xls.buttonContent,f=l.prototype.xls.defaultClass,m=c({uuid:t.uuid,type:"xls"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},xls:function(t){var e=this,r=e.settings,o=l.prototype.xls.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":t.textContent}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.xls.mimeType,fileExtension:l.prototype.xls.fileExtension})),u=l.prototype.xls.buttonContent,f=l.prototype.xls.defaultClass,m=c({uuid:t.uuid,type:"xls"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},csv:function(t){var e=this,r=e.settings,o=l.prototype.csv.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":'"'+r.formatValue(t.textContent.replace(/"/g,'""'))+'"'}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.csv.mimeType,fileExtension:l.prototype.csv.fileExtension})),u=l.prototype.csv.buttonContent,f=l.prototype.csv.defaultClass,m=c({uuid:t.uuid,type:"csv"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m},txt:function(t){var e=this,r=e.settings,o=l.prototype.txt.separator,n=i(t.rows).map(function(e,n){if(!~r.ignoreRows.indexOf(n-t.thAdj)&&!a(e,r.ignoreCSS)){var s=e.querySelectorAll("th, td");return i(s).map(function(t,e){if(!~r.ignoreCols.indexOf(e)&&!a(t,r.ignoreCSS))return a(t,r.emptyCSS)?" ":r.formatValue(t.textContent)}).join(o)}}).join(e.rowDel),s=l.prototype.escapeHtml(JSON.stringify({data:n,filename:t.filename,mimeType:l.prototype.txt.mimeType,fileExtension:l.prototype.txt.fileExtension})),u=l.prototype.txt.buttonContent,f=l.prototype.txt.defaultClass,m=c({uuid:t.uuid,type:"txt"}),d=r.exportButtons&&l.prototype.createObjButton(m,s,u,f,r.bootstrapSettings);return d&&t.checkCaption(d),p.getInstance().setItem(m,s,!0),m}},createObjButton:function(t,e,r,o,n){var i=document.createElement("button");return i.setAttribute("tableexport-id",t),i.className=n.bootstrapClass+n.bootstrapTheme+o,i.textContent=r,i},escapeHtml:function(t){return String(t).replace(/[&<>'\/]/g,function(t){return l.prototype.entityMap[t]})},translateMimeType:function(t){return String(t).replace(/&#47;/,"/").replace(this.xls.mimeType,this.csv.mimeType)},formatValue:function(t,e){return t?e.trim():e},getType:function(t){if(!t)return"";var e=l.prototype.types;return~t.indexOf(e.string.defaultClass)?"s":~t.indexOf(e.number.defaultClass)?"n":~t.indexOf(e["boolean"].defaultClass)?"b":~t.indexOf(e.date.defaultClass)?"d":""},dateNum:function(t,e){e&&(t+=1462);var r=Date.parse(t);return(r-new Date(Date.UTC(1899,11,30)))/864e5},createSheet:function(t){for(var e={},r={s:{c:1e7,r:1e7},e:{c:0,r:0}},n=l.prototype.types,i=0;i!==t.length;++i)for(var a=0;a!==t[i].length;++a){r.s.r>i&&(r.s.r=i),r.s.c>a&&(r.s.c=a),r.e.r<i&&(r.e.r=i),r.e.c<a&&(r.e.c=a);var s=t[i][a];if(s&&s.v){var p=o.utils.encode_cell({c:a,r:i});s.t||(n.number.assert(s.v)?s.t="n":n["boolean"].assert(s.v)?s.t="b":n.date.assert(s.v)?s.t="d":s.t="s"),"d"===s.t&&(s.t="n",s.z=o.SSF._table[14],s.v=this.dateNum(s.v)),e[p]=s}}return r.s.c<1e7&&(e["!ref"]=o.utils.encode_range(r)),e},downloadHandler:function(t){var 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\ No newline at end of file