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- # zone.coffee

- ¶

  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

  Provides a default handler for events related to zones. A zone is any kind of client-side element that can be updated; a zone will normally have a unique id. Typically, a client-side zone element is rendered by, and corresponds to, a server-side core/Zone component; however, certain other components (such as core/ProgressiveDisplay) may also be treated as zones.

  Most often, a zone is any element with attribute `data-container-type=zone` and corresponds to a core/Zone server-side component.

      define ["./dom", "./events", "./ajax", "./console", "./forms",  "underscore"],

        (dom, events, ajax, console, forms, _) ->

- ¶

  For a given element that may have the `data-update-zone` attribute, locates the zone element. May return null if the zone can not be found (after logging an error to the console).

  - element - starting point for determining zone

          findZone = (element) ->
            zoneId = element.attr "data-update-zone"

            if zoneId is "^"
              zone = element.findParent "[data-container-type=zone]"

              if zone is null
                throw new Error "Unable to locate containing zone for #{element}."

              return zone

            zone = dom zoneId

            if zone is null
              throw new Error "Unable to locate zone '#{zoneId}'."

            return zone

          dom.onDocument "click", "a[data-update-zone]", (event) ->

            element = @closest "[data-update-zone]"

            unless element
              throw new Error "Could not locate containing element with data-update-zone attribute."

            zone = findZone element

            if zone
              zone.trigger events.zone.refresh,  url: element.attr "href"

            event.nativeEvent.preventDefault()
            return

          dom.onDocument "submit", "form[data-update-zone]", ->

            zone = findZone this

            if zone
              formParameters = forms.gatherParameters this

              zone.trigger events.zone.refresh,
                url: (@attr "action")
                parameters: formParameters

            return false

          dom.onDocument "submit", "form[data-async-trigger]", ->

            formParameters = forms.gatherParameters this

            @addClass "ajax-update"

            ajax (@attr "action"),
              data: formParameters
              complete: => @removeClass "ajax-update"

            return false

          dom.onDocument events.zone.update, (event) ->

            @trigger events.zone.willUpdate

            content = event.memo.content

- ¶

  The server may have passed down the empty string for the content; that removes the existing content. On the other hand, the server may have not provided a content key; in that case, content is undefined which means to leave the existing content alone.

  Note that currently, the willUpdate and didUpdate events are triggered even when the zone is not actually updated. That may be a bug.

            unless content is undefined
              @update content

            @trigger events.initializeComponents
            @trigger events.zone.didUpdate

          dom.onDocument events.zone.refresh, (event) ->

- ¶

  This event may be triggered on an element inside the zone, rather than on the zone itself. Scan upwards to find the actual zone.

            zone = @closest "[data-container-type=zone]"

- ¶

  A Zone inside a form will render some additional parameters to coordinate updates with the Form on the server.

            attr = zone.attr "data-zone-parameters"

            parameters = attr and JSON.parse attr

            simpleIdParams = if zone.attr "data-simple-ids" then {"t:suppress-namespaced-ids": true}

            ajax event.memo.url,
              data: _.extend { "t:zoneid": zone.element.id }, simpleIdParams, parameters, event.memo.parameters
              success: (response) ->
                zone.trigger events.zone.update, content: response.json?.content

          dom.onDocument "click", "a[data-async-trigger]", (event)->
            link = @closest 'a[data-async-trigger]'

            link.addClass "ajax-update"

            ajax (link.attr "href"),
              complete: -> link.removeClass "ajax-update"

            event.nativeEvent.preventDefault()

            return

- ¶

  Locates a zone element by its unique id attribute, and (deferred, to a later event loop cycle), performs a standard refresh of the zone. This is primarily used by the core/ProgressiveDisplay component.

  - id - client id of the element
  - url - URL to use to refresh the element.

          deferredZoneUpdate = (id, url) ->

            _.defer ->
              zone = dom id

              if zone is null
                console.error "Could not locate element '#{id}' to update."
                return

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

- ¶

  Most of this module is document-level event handlers, but there’s also some exports:

          return { deferredZoneUpdate, findZone }