JSFiddle - React, Tailwind, and code Playground

HTML

<select id="combobox">
        <option value="">Select one...</option>
        <option value="ActionScript">ActionScript</option>
        <option value="AppleScript">AppleScript</option>
        <option value="Asp">Asp</option>
        <option value="BASIC">BASIC</option>
        <option value="C">C</option>
        <option value="C++">C++</option>
        <option value="Clojure">Clojure</option>
        <option value="COBOL">COBOL</option>
        <option value="ColdFusion">ColdFusion</option>
        <option value="Erlang">Erlang</option>
        <option value="Fortran">Fortran</option>
        <option value="Groovy">Groovy</option>
        <option value="Haskell">Haskell</option>
        <option value="Java">Java</option>
        <option value="JavaScript">JavaScript</option>
        <option value="Lisp">Lisp</option>
        <option value="Perl">Perl</option>
        <option value="PHP">PHP</option>
        <option value="Python">Python</option>
        <option value="Ruby">Ruby</option>
        <option value="Scala">Scala</option>
        <option value="Scheme">Scheme</option>
    </select>

CSS

.custom-combobox {
    position: relative;
    display: inline-block;
  }
  .custom-combobox-toggle {
    position: absolute;
    top: 0;
    bottom: 0;
    margin-left: -1px;
    padding: 0;
    /* support: IE7 */
    *height: 1.7em;
    *top: 0.1em;
  }
  .custom-combobox-input {
    margin: 0;
    padding: 0.1em;
    width: 120px; 
  }

JavaScript

(function ($) {
        $.widget("custom.combobox", {
            _create: function () {
                this.wrapper = $("<span>")
          .addClass("custom-combobox")
          .insertAfter(this.element);

                this.element.hide();
                this._createAutocomplete();
                this._createShowAllButton();
            },

            _createAutocomplete: function () {
                var selected = this.element.children(":selected"),
          value = selected.val() ? selected.text() : "";

                this.input = $("<input>")
          .appendTo(this.wrapper)
          .val(value)
          .attr("title", "")
          .addClass("custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left")
          .autocomplete({
              delay: 0,
              minLength: 0,
              source: $.proxy(this, "_source")
          })
          .tooltip({
              tooltipClass: "ui-state-highlight"
          });

                this._on(this.input, {
                    autocompleteselect: function (event, ui) {
                        ui.item.option.selected = true;
                        this._trigger("select", event, {
                            item: ui.item.option
                        });
                    },

                    autocompletechange: "_removeIfInvalid"
                });
            },

            _createShowAllButton: function () {
                var input = this.input,
          wasOpen = false;

                $("<a>")
          .attr("tabIndex", -1)
          .attr("title", "Show All Items")
          .tooltip()
          .appendTo(this.wrapper)
          .button({
              icons: {
                  primary: "ui-icon-triangle-1-s"
              },
              text: false
          })
          .removeClass("ui-corner-all")
          .addClass("custom-combobox-toggle ui-corner-right")
          .mousedown(function () {
              wasOpen =...