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HTML

              
                <form id="make_checkbox_select">
  <select name="category">
      <option value="My first category">My first category</option>
      <option value="My second category">My second category</option>
      <option value="My third category">My third category</option>
      <option value="My fourth category">My fourth category</option>
      <option value="My fifth category">My fifth category</option>
      <option value="My sixth category">My sixth category</option>
      <option value="My seventh category">My seventh category</option>
      <option value="My eighth category">My eighth category</option>
      <option value="My ninth category">My ninth category</option>
      <option value="My tenth category">My tenth category</option>
  </select>

  <input type="submit">
</form>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>

<script>
  $(function() {
    var mySelectCheckbox = new checkbox_select({
      selector: "#make_checkbox_select",
      selected_translation: 'selected',
      all_translation: 'All categories',
      not_found: 'Nothing found',
      // Event during initialization
      onApply: function(e) {
        alert("Custom Event: " + e.selected);
      }
    });
  });
</script>
              
            
!

CSS

              
                body {
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";
    font-size: 14px;
    line-height: 1.5;
    color: #24292e;
    background-color: #fff;
}
input, select, button {
  font-family: inherit;
  font-size: inherit;
}

div.checkbox_select {
  width: 200px;
}
.checkbox_select_anchor {
  display: block;
  background-color: #EEEEEE;
  cursor: pointer;
  padding: 8px;
  position: relative;
}

.checkbox_select_anchor:hover {
  background-color: #CCCCCC !important;
}

.expanded .checkbox_select_anchor {
  background-color: #CCCCCC;
}

div.checkbox_select .select_input {
  width: 100%;
  cursor: pointer;
}

.checkbox_select_dropdown {
  display: none;
  background: whitesmoke;
}

.checkbox_select_dropdown.show {
  display: block;
}

.checkbox_select_dropdown ul {
  max-height: 150px;
  overflow-y: scroll;
  overflow-x: hidden;
  padding: 0;
  margin: 0;
  border: 1px solid #999;
  border-top: 0;
  border-bottom: 0;
}
.checkbox_select_dropdown ul li {
  list-style: none;
  position: relative;
  color: #666;
}
.checkbox_select_dropdown ul li label {
  position: relative;
  padding: 0 0 0 24px;
  display: block;
  cursor: pointer;
}
.checkbox_select_dropdown ul li label:hover {
  background: #cbcbcb;
  color: white;
}
.checkbox_select_dropdown ul li input:checked + label {
  background: #ccc;
  color: black;
}
.checkbox_select_dropdown ul li input {
  position: absolute;
  left: 0;
  z-index: 1;
  display: inline-block;
}
.checkbox_select_search {
  width: 200px;
}

.checkbox_select_submit {
  width: 100%;
  cursor: pointer;
}

.hide {
  display: none;
}

              
            
!

JS

              
                var checkbox_select = function(params) {
  var that = this,
      $_native_form = $(params.selector),
      $_native_select = $_native_form.find("select"),

      // Variables
      selector = params.selector,
      select_name = $_native_select.attr("name").charAt(0).toUpperCase() + $_native_select.attr("name").substr(1),
      selected_translation = params.selected_translation ? params.selected_translation : "selected",
      all_translation = params.all_translation ? params.all_translation : "All " + select_name + "s",
      not_found_text = params.not_found ? params.not_found : "No " + select_name + "s found.",
      currently_selected = [],

      // Create the elements needed for the checkbox select
      $_parent_div = $("<div />").addClass("checkbox_select"),
      $_select_anchor = $("<a />").addClass("checkbox_select_anchor").text(select_name),
      $_search = $("<input />").addClass("checkbox_select_search"),
      $_submit = $("<input />").addClass("checkbox_select_submit").val("Apply").attr("type", "submit").data("selected", ""),
      $_dropdown_div = $("<div />").addClass("checkbox_select_dropdown"),
      $_not_found = $("<span />").addClass("not_found hide").text(not_found_text),
      $_ul = $("<ul />"),

      updateCurrentlySelected = function() {
        var selected = [];

        $_ul.find("input:checked").each(function() {
          selected.push($(this).val());
        });

        currently_selected = selected;

      if (selected.length == 0) {
        $_select_anchor.text(select_name);
      } else if (selected.length == 1) {
        $_select_anchor.text(selected[0] + " " + selected_translation);
      } else if (selected.length == $_ul.find("input[type=checkbox]").length) {
        $_select_anchor.text(all_translation);
      } else {
        $_select_anchor.text(selected.length + " " + selected_translation);
      }
    },
    // Template for the li, will be used in a loop.
    createItem = function(name, value) {
      var uID = "checkbox_select_" + select_name + "_" + name.replace(" ", "_"),
        $_li = $("<li />"),
        $_checkbox = $("<input />")
          .attr({
            name: name,
            id: uID,
            type: "checkbox",
            value: value
          })
          .click(function() {
            updateCurrentlySelected();
          }),
        $_label = $("<label />").attr("for", uID),
        $_name_span = $("<span />")
          .text(name)
          .prependTo($_label);

      return $_li.append($_checkbox.after($_label));
    },
    apply = function() {
      $_dropdown_div.toggleClass("show");
      $_parent_div.toggleClass("expanded");

      if (!$_parent_div.hasClass("expanded")) {
        // Only do the Apply event if its different
        if (currently_selected != $_submit.data("selected")) {
          $_submit.data("selected", currently_selected);

          that.onApply({
            selected: $_submit.data("selected")
          });
        }
      }
    };

  // Event of this instance
  that.onApply =
    typeof params.onApply == "function"
      ? params.onApply
      : function(e) {
          //e.selected is accessible
        };

  that.update = function() {
    $_ul.empty();
    $_native_select.find("option").each(function(i) {
      $_ul.append(
        createItem($(this).text(), $(this).val())
      );
    });

    updateCurrentlySelected();
  };

  that.check = function(checkbox_name, checked) {
    $_ul.find("input[type=checkbox]").each(function() {
      // If this elements name is equal to the one sent in the function
      if ($(this).attr("name") == checkbox_name) {
        // Apply the checked state to this checkbox
        $(this).attr("checked", checked ? checked : false);

        // Break out of each loop
        return false;
      }
    });

    updateCurrentlySelected();
  };

  // Build mark up before pushing into page
  $_dropdown_div.prepend($_search);
  $_dropdown_div.append($_ul);
  $_dropdown_div.append($_not_found);
  $_dropdown_div.append($_submit);
  $_dropdown_div.appendTo($_parent_div);
  $_select_anchor.prependTo($_parent_div);

  // Iterate through option elements
  that.update();

  // Events

  // Actual dropdown action
  $_select_anchor.click(function() {
    apply();
  });

  // Filters the checkboxes by search on keyup
  $_search.keyup(function() {
    var search = $(this)
      .val()
      .toLowerCase()
      .trim();

    if (search.length == 1) {
      $_ul.find("label").each(function() {
        if (
          $(this)
            .text()
            .toLowerCase()
            .charAt(0) == search.charAt(0)
        ) {
          if (
            $(this)
              .parent()
              .hasClass("hide")
          )
            $(this)
              .parent()
              .removeClass("hide");

          if (!$_not_found.hasClass("hide")) $_not_found.addClass("hide");
        } else {
          if (
            !$(this)
              .parent()
              .hasClass("hide")
          )
            $(this)
              .parent()
              .addClass("hide");

          if ($_not_found.hasClass("hide")) $_not_found.removeClass("hide");
        }
      });
    } else {
      // If it doesn't contain
      if ($_ul.text().toLowerCase().indexOf(search) == -1) {
        if ($_not_found.hasClass("hide")) $_not_found.removeClass("hide");
      } else {
        if (!$_not_found.hasClass("hide")) $_not_found.addClass("hide");
      }

      $_ul.find("label").each(function() {
        if ($(this).text().toLowerCase().indexOf(search) > -1) {
          if ($(this).parent().hasClass("hide"))
            $(this).parent().removeClass("hide");
        } else {
          if (!$(this).parent().hasClass("hide"))
            $(this).parent().addClass("hide");
        }
      });
    }
  });

  $_submit.click(function(e) {
    e.preventDefault();

    apply();
  });

  // Delete the original form submit
  $(params.selector).find("input[type=submit]").remove();

  // Put finalized markup into page.
  $_native_select.after($_parent_div);

  // Hide the original element
  $_native_select.hide();
};

              
            
!
999px

Console