query_helpers.coffee

addParams = (path, params) ->
  query = objToQuery(params)
  joinChar = if /\?/.test(path) then '&' else '?'
  "#{path}#{joinChar}#{query}"

objToQuery = (obj) ->
  pairs = []
  for own key, val of obj
    if val? and val != ''
      val = encodeURIComponent(val)
    pairs.push("#{encodeURIComponent(key)}=#{val}")
  pairs.join('&')

# returns querystring as an object
parseParams = ->
  query = window.location.search.substr(1)
  out = {}
  return out unless query != ''
  for keyval in query.split('&')
    pair = keyval.split('=')
    key = decodeURIComponent(pair[0])
    val = pair[1]
    if val? && val != ''
      out[key] = decodeURIComponent(val)
    else
      out[key] = null
  out