My common js methods

common.js.coffee

flashTimer = null
$(document).ready ->
  c = undefined
  CommonJs =
    settings:
      domInputs: ->
        $("input[type='text'], input[type='email'], input[type='password']")
    
    init: ->
      c = @settings
      @bindUIActions()

    bindUIActions: ->
      @setMaxLengthToInputs()
      $(document).ajaxComplete ->
        CommonJs.setMaxLengthToInputs()
      hideFlash()

    setMaxLengthToInputs: ->
      c.domInputs().attr "maxlength", 255

  CommonJs.init()

root = exports ? this
root.toggleDoms = (show, hide) ->
  show.show()
  hide.hide()

# type => alert-success, alert-info, alert-error
root.displayFlash = (message, type) ->
  flash = "<div class='alert fade in " + type + "'><button data-dismiss='alert' class='close'>×</button>"
  flash += message + "</div>"
  $("div.alert:first").remove()
  $(MAIN_CONTAINER).prepend flash
  $('html,body').animate({scrollTop: $(".alert:first").offset().top-50},'slow');
  hideFlash()

root.hideFlash = ->
  clearTimeout flashTimer
  flashTimer = setTimeout(->
    $(".alert:first").remove()  unless $(".alert:first").hasClass("alert-danger")
  , 6000)

root.truncate = (str, len) ->
  if len is undefined
    len = 20
  return str if str.length <= len
  str.substring(0, len) + "..."

# displayErrors("#{j @user.errors.to_json.html_safe}", "user"); create.js.haml
root.displayErrors = (error_string, modelName) ->
  error_hash = JSON.parse error_string
  #error_hash = jQuery.parseJSON error_string
  $(".errorSpan").remove()
  error_dom = ""
  $.each error_hash, (attr, error) ->
    error_dom = "<span class='errorSpan'>#{error}</span>"
    attr = attr.replace(".", "_attributes][")
    el = $("[name^='#{modelName}[#{attr}]']")
    if el.prop("type") is "radio" or el.prop("type") is "checkbox"
      el.parents(".controls:first").append error_dom
    else
      $(error_dom).insertAfter el
  $('html,body').animate({scrollTop: $(".errorSpan:visible").offset().top-100},'slow');