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- # zone-refresh.coffee

- ¶

  Copyright 2012 The Apache Software Foundation

  Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

      http:#www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

- ¶

  ## t5/core/zone-refresh

      define ["./events", "./dom", "./console"],
        (events, dom, console) ->

- ¶

  Initialize a timer for the zone at the specified period (in seconds). The zone will be refreshed with the provided URL.

          initialize = (zoneId, period, url) ->
            zone = dom zoneId

            unless zone
              console.err "Zone #{zoneId} not found for periodic refresh."
              return

- ¶

  Only one periodic refresh per zone.

            return if zone.meta "periodic-refresh"

            zone.meta "periodic-refresh", true

            executing = false

- ¶

  Whenever the zone updates, we can clear the executing flag.

            zone.on events.zone.didUpdate, ->
              executing = false
              return

            cleanUp = ->
              window.clearInterval intervalId
              zone = null
              return

            handler = ->

- ¶

  Don’t clog things up if the response rate is too slow

              return if executing

- ¶

  If the zone element is no longer part of the DOM, stop the timer

              unless (zone.closest 'body')
                cleanUp()
                return

- ¶

  Set the flag now, it will clear when the zone updates.

              executing = true

              zone.trigger events.zone.refresh, { url }

            intervalId = window.setInterval handler, period * 1000

- ¶

  Not sure if this is needed except for IE:

            (dom window).on "beforeunload", cleanUp

- ¶

  export the single function:

          return initialize