javascript - Bootstrap dropdown as select option -

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how make bootstrap dropdown act html select option? had problem. partially think bootstrap missing feature in core library, team must have reason not including in library.

this first time posting q&a question. if doesn't question, i'm sorry.

here extended methods:

$.fn.extend({     dropdownconvert: function(b) {         b = b || true;         console.log(b);         this.each(function(){             var $this = $(this);             if ($this.prop("tagname") == "select" && typeof $this.attr("id") == "string" && $this.find("option").length > 0) {                 var temp = '<div class="dropdown" id="' + $this.attr("id") + '"><button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"><span class="selected">' + $this.find("option")[0].innerhtml + '</span> <span class="caret"></span></button><ul class="dropdown-menu">';                 var o = $this.find("option");                 (var = 0; < o.length; i++) {                     temp += '<li><a>' + o[i].innerhtml + '</a></li>';                 }                 temp += '</ul></div>';                 $this[0].outerhtml = temp;                 if (b)                     $("#"+$this.attr("id")).dropdown();             }         });     },     dropdown: function(cb) {         console.log($(this));         this.each(function(){             var $drop = $(this);             $drop.find("a").bind("click", function(){                 var selected = $(this).text();                 $drop.find(".selected").text(selected);                 $drop.attr("data-selected", selected.tolowercase());                 if (typeof cb === "function") {                     cb.call($drop, selected.tolowercase());                 }             })         });         return this;     },     dropdownval: function(v) {         var $drop = $(this).first();         if($drop.hasclass("dropdown")) {             if (v !== undefined) {                 v = string(v);                 var c = string(v+" ")[0].touppercase() + v.substring(1,v.length);                 $drop.attr("data-selected", v);                 $drop.find(".selected").text(c);             } else {                 if ($drop.data("selected") !== undefined) {                     return $drop.attr("data-selected");                 } else {                     return $drop.find(".selected").text();                 }             }         } else {             return undefined;         }     } });

$(elem).dropdownconvert();

this convert <select> <option> elements bootstrap dropdown. the element must have id else function not run properly.

arguments: b: boolean, default - true. set false stop elements attaching dropdown click event. if unset, code run $(elem).dropdown() after conversion.

$(elem).dropdown();

this make bootstrap downdowns behave <select> <option> elements. button text change last item you've clicked.

arguments: cb: function. callback function. called argument cb() selected item.

$(elem).dropdownval();

this similar $(elem).val() input elements. selected item return. $(elem).dropdown() needs run prior calling method.

arguments: value: converted text. if argument other undefined, set current selected option value provided regardless of whether 1 of default options in select. leaving blank return selected value.

auto convert bootstrap-styled dropdown when page loads

$(function(){     $("select").dropdownconvert(); })

demo

$.fn.extend({      dropdownconvert: function(b) {          b = b || true;          console.log(b);          this.each(function(){              var $this = $(this);              if ($this.prop("tagname") == "select" && typeof $this.attr("id") == "string" && $this.find("option").length > 0) {                  var temp = '<div class="dropdown" id="' + $this.attr("id") + '"><button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"><span class="selected">' + $this.find("option")[0].innerhtml + '</span> <span class="caret"></span></button><ul class="dropdown-menu">';                  var o = $this.find("option");                  (var = 0; < o.length; i++) {                      temp += '<li><a>' + o[i].innerhtml + '</a></li>';                  }                  temp += '</ul></div>';                  $this[0].outerhtml = temp;                  if (b)                      $("#"+$this.attr("id")).dropdown();              }          });      },      dropdown: function(cb) {          console.log($(this));          this.each(function(){              var $drop = $(this);              $drop.find("a").bind("click", function(){                  var selected = $(this).text();                  $drop.find(".selected").text(selected);                  $drop.attr("data-selected", selected.tolowercase());                  if (typeof cb === "function") {                      cb.call($drop, selected.tolowercase());                  }              })          });          return this;      },      dropdownval: function(v) {          var $drop = $(this).first();          if($drop.hasclass("dropdown")) {              if (v !== undefined) {                  v = string(v);                  var c = string(v+" ")[0].touppercase() + v.substring(1,v.length);                  $drop.attr("data-selected", v);                  $drop.find(".selected").text(c);              } else {                  if ($drop.data("selected") !== undefined) {                      return $drop.attr("data-selected");                  } else {                      return $drop.find(".selected").text();                  }              }          } else {              return undefined;          }      }  });  $(function(){    $("select").dropdownconvert();    $("#t-1").click(function(){      $("#result").text($("#v-1").dropdownval());    });    $("#t-2").click(function(){      $("#v-1").dropdownval("melon");    });  })
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>      <h1>this select option:</h1>  <select id="v-1">    <option>apple</option>    <option>orange</option>    <option>banana</option>  </select>  <button type="button" id="t-1">what selected option?</button>  <button type="button" id="t-2">set value "melon"</button>  <p id="result"></p>


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