Implementing Tabs tab custom plug-in based on jQuery

(function ($) {
 'use strict';
 var defaults = {
 type: "iframe",
 onchanged: null,
 style: {
  header_panel: "tab-headers",
  content_panel: "tab-contents",
  header: "tab-header",
  content: "tab-content",
  selected: "selected",
  icon_base: "fa",
  icon_close: "fa-close"
 }
 }
 var methods = {
 init: function (options) {
  return this.each(function () {
  var $this = $(this);
  if (!$this.hasClass("tw.tabs")) {
   $this.addClass("tabs");
  }
  var settings = $this.data('tw.tabs');
  if (typeof (settings) == 'undefined') {
   settings = $.extend({}, defaults, options);
   $this.data('tw.tabs', settings);
  } else {
   settings = $.extend({}, settings, options);
   $this.data('tw.tabs', settings);
  }
  $this.empty();
  $this.append($("<ul class=&#39;" + settings.style.header_panel + "&#39;></ul>"));
  $this.append($("<div class=&#39;" + settings.style.content_panel + "&#39;></div>"));
  if (settings.data) {
   if (typeof settings.data === &#39;string&#39;) {
   settings.data = $.parseJSON(settings.data);
   }
   $.each(settings.data, function () {
   $this.tabs("add", this);
   });
  }
  });
 },
 add: function (tab) {
  var $this = $(this);
  var settings = $this.data("tw.tabs");
  var headers = $this.find("." + settings.style.header_panel);
  var contents = $this.find("." + settings.style.content_panel);
  if (headers.find("[data-tab=&#39;" + tab.id + "&#39;]").length == 0) {
  var header = $("<li class=&#39;" + settings.style.header + "&#39; data-tab=&#39;" + tab.id + "&#39;>" +
   "<i class=&#39;" + settings.style.icon_base + "" + tab.icon + "&#39;></i>" +
   "<span class=&#39;tab-title&#39;>" + tab.name + "</span></li>");
  if (tab.canClose) {
   var close = $("<i class=&#39;" + settings.style.icon_base + "" + settings.style.icon_close + "&#39;></i>");
   close.click(function () {
   $this.tabs("remove", tab.id);
   });
   header.append(close);
  }
  header.data("tw.tab", tab);
  header.click(function () {
   $this.tabs("select", tab);
  });
  headers.append(header);
  var content = $("<div class=&#39;" + settings.style.content + "&#39; data-tab=&#39;" + tab.id + "&#39;></div>");
  if (settings.type == "iframe") {
   content.append("<iframe src=&#39;" + tab.url + "?target_id=" + tab.id + "&#39;></iframe>");
  } else if (settings.type == "ajax"){
   $.ajax({
   url: tab.url,
   type: "post",
   async: false,
   data: { target_id: tab.id },
   success: function (result) {
    content.html(result);
   }
   });
  } else {
   content.html(tab.content);
  }
  contents.append(content);
  if (tab.selected) {
   $this.tabs("select", tab);
  }
  } else {
  $this.tabs("select", tab);
  }
 },
 select: function (tab) {
  var $this = $(this);
  var settings = $this.data("tw.tabs");
  $this.find("." + settings.style.selected).removeClass(settings.style.selected);
  if (typeof tab == "object") {
  $this.find("[data-tab=&#39;" + tab.id + "&#39;]").addClass(settings.style.selected);
  } else {
  $this.find("." + settings.style.header).eq(tab).addClass(settings.style.selected);
  $this.find("." + settings.style.content).eq(tab).addClass(settings.style.selected);
  }
  if (settings.onchanged) {
  settings.onchanged(tab);
  }
 },
 refresh: function () {
  var $this = $(this);
  var selected = $this.find("." + settings.style.selected);
  var tab = $this.find("." + settings.style.header).data("tw.tab");
  if (settings.type == "iframe") {
  selected.find("iframe").attr(&#39;src&#39;, tab.url + "?target_id=" + tab.id);
  } else if (settings.type == "ajax") {
  $.ajax({
   url: tab.url,
   type: "post",
   async: false,
   data: { target_id: tab.id },
   success: function (result) {
   content.html(result);
   }
  });
  } else {
  content.html(tab.content);
  }
 },
 remove: function (id) {
  var $this = $(this);
  var settings = $this.data("tw.tabs");
  var tab = $this.find("[data-tab=&#39;" + id + "&#39;]");
  if (tab.find("." + settings.style.selected)) {
  var index = tab.eq(0).index() - 1;
  $this.tabs("select", index);
  }
  tab.remove();
 },
 destroy: function (options) {
  return $(this).each(function () {
  var $this = $(this);
  $this.removeData(&#39;tabs&#39;);
  });
 }
 }
 $.fn.tabs = function () {
 var method = arguments[0];
 var args = arguments;
 if (typeof (method) == &#39;object&#39; || !method) {
  method = methods.init;
 } else if (methods[method]) {
  method = methods[method];
  args = $.makeArray(arguments).slice(1);
 } else {
  $.error(&#39;Method &#39; + method + &#39; does not exist on tw.tabs&#39;);
  return this;
 }
 return method.apply(this, args);
 }
}
)(jQuery);

.tabs {
 width:100%;
 height:100%;
}
 .tabs .tab-headers {
 margin:0;
 padding:0 10px;
 height:40px;
 list-style:none;
 background:#f5f5f5;
 border-bottom:1px solid #ccc;
 }
 .tabs .tab-headers .tab-header {
  float:left;
  height:30px;
  font-size:12px;
  padding:7px 15px 0;
  margin-top:10px;
  margin-right:5px;
  border:1px solid #ccc;
  border-bottom:none;
  position:relative;
  cursor:pointer;
 }
  .tabs .tab-headers .tab-header:hover {
  background:#ccc;
  color:#0094ff;
  }
  .tabs .tab-headers .tab-header.selected {
  background:#fff;
  border:none;
  cursor:default;
  padding-top:5px;
  margin-left:1px;
  margin-right:6px;
  border-top:3px solid #0094ff;
  }
  .tabs .tab-headers .tab-header .tab-title {
  margin-left:5px;
  }
  .tabs .tab-headers .tab-header .fa-close {
  position:relative;
  right:-6px;
  top:0;
  }
  .tabs .tab-headers .tab-header .tab-close:hover {
   color:#f00;
   cursor:pointer;
  }
 .tabs .tab-contents {
 width: 100%;
 height: calc(100% - 40px);
 }
 .tabs .tab-contents .tab-content {
  display:none;
 }
  .tabs .tab-contents .tab-content.selected {
  display: block;
  width: 100%;
  height: 100%;
  overflow: hidden;
  }
  .tabs .tab-contents .tab-content.selected iframe {
   width: 100%;
   height: 100%;
   border: none;
  }