boton borrado de campos bootstrap

borracontenido.js

$ = jQuery
 
$.fn.inputClear = (options={}) ->
 
  @each (i, input) ->
    input = $(input)
 
    clearButton = input.data("clear-button")
 
    init = ->
      icon = options.icon ? "glyphicon-remove"
      iconHtml = if icon
          """<span class="glyphicon #{icon}"></span>"""
        else
          ""
      html = options.html || ""
      html = " #{html}" if icon && options.html
      clearButton = $("""<a href="#">#{iconHtml}#{html}</a>""")
        .css
          display:   "inline"
          cursor:    "pointer"
          color:     "#888"
          position:  "absolute"
          top:       input.position().top
          left:      input.position().left + input.outerWidth()
          margin:    "8px 0px 0px -20px"
        .on "click", (e) ->
          e.preventDefault()
          input
            .val("")
            .trigger "change"
            .focus()
          showHideButton()
      input.data("clear-button", clearButton)
        .on("keyup", showHideButton)
        .after(clearButton)
      showHideButton()
 
    showHideButton = ->
      clearButton.toggle(input.val() != "")
 
    init() unless clearButton?
 
  this