Save Query parameters to location.href

save_state.coffee

save_state = (stateInfo) ->
  currentState = {}
  
  for term in window.location.href.split(/\?|&/)
    [key, value] = term.split('=')
    continue unless value?
    currentState[key] = decodeURIComponent(value)
  
  for key, value of stateInfo
    if value?
      currentState[key] = value
    else
      delete currentState[key]
  
  queryString = ("#{key}=#{encodeURIComponent(value)}" for key, value of currentState).join('&')
  history.pushState(({}), document.title, "#{window.location.pathname}?#{queryString}")
  currentState