Tokenahead - ghetto typeahead with facebook-like tokens 4 @couch <3

bootstrap-tokenahead.js

!function ($) {

  "use strict"; // jshint ;_;


 /* TOKENAHEAD PUBLIC CLASS DEFINITION
  * ================================== */

  var Tokenahead = function (element, options) {
    this.$wrapper = $(element)
    this.$measurer = $('.measurer', this.$wrapper)
    this.$tokens = $('.tokens', this.$wrapper)
    $.fn.typeahead.Constructor.call(this, $('input', this.$wrapper), options)
  }

  Tokenahead.prototype = $.extend({}, $.fn.typeahead.Constructor.prototype, {

    constructor: Tokenahead

  , updater: function (item) {
      this.addToken(item)
      return ''
    }

  , addToken: function (item) {
      var token = $(this.options.token)
        , text = $('<span></span>').text(item).appendTo(token)
      token.appendTo(this.$tokens)
    }

  , listen: function () {
      var that = this

      $.fn.typeahead.Constructor.prototype.listen.call(this)

      this.$wrapper
        .on('click', 'a', function (e) {
          e.stopPropagation()
        })
        .on('click', '.close', function (e) {
          $(this).parent().remove()
        })
        .on('click', function () {
          that.$element.focus()
        })

      this.$element
        .on('focus', function (e) {
          if (!that.$element.val()) return that.isEmpty = true
        })
        .on('keyup', function (e) {
          var tokens
            , value

          if (e.keyCode == 13 && !that.shown && (value = that.$element.val())) { //enter with no menu and val
            that.$element
              .val('')
              .change()
            that.addToken(value)
            return that.$element.focus()
          }

          if (e.keyCode != 8 || that.$element.val()) return that.isEmpty = false//backspace
          if (!that.isEmpty) return that.isEmpty = true
          tokens = $('a', that.$wrapper)
          if (!tokens.length) return
          tokens.last().remove()
        })
        .on('keypress keydown paste', function () {
          var value = that.$element.val()
          that.$measurer.text(value)
          that.$element.css('width', that.$measurer.width() + 30)
        })
    }

  })

 /* TOKENAHEAD PLUGIN DEFINITION
  * ============================ */

  $.fn.tokenahead = function (option) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('tokenahead')
        , options = typeof option == 'object' && option
      if (!data) $this.data('tokenahead', (data = new Tokenahead(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

  $.fn.tokenahead.Constructor = Tokenahead

  $.fn.tokenahead.defaults = $.extend({} , $.fn.typeahead.defaults, {
    token: '<a><button class="close">&times;</button></a>'
  })

}(window.jQuery)

index.html

<!-- markup -->

<div class="input-xlarge uneditable-input tokenahead">
  <div class="measurer"></div>
  <div class="tokens"></div>
  <input type="text">
</div>

<script>
$(function () {
  $('.tokenahead').tokenahead({
    items: 4
  , source: ["fat","mdo","dhg"]
  })
})
</script>

Tokenahead.less

// Tokenahead.less
// ---------------

.tokenahead {
  cursor: text;
  overflow: hidden;
  height: auto;
  padding-bottom: 0;
  border-color: @inputBorder;
}

.tokenahead a {
  cursor: default;
  float: left;
  display: inline-block;
  border: 1px solid @inputBorder;
  text-decoration: none;
  padding: 0 4px;
  margin: 0 3px 3px 0;
  .border-radius(@inputBorderRadius);
}

.tokenahead a:hover {
  color: @linkColor;
}

.tokenahead button.close {
  font-size: 14px;
  line-height: 14px;
  margin-left: 4px;
}

.tokenahead .measurer {
  position: absolute;
  top: -1000px;
}

.tokenahead input {
  border: none;
  box-shadow: none;
  float: left;
  margin: 0 0 5px;
  padding: 0;
  width: 30px;
}