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- # ajax.coffee

- ¶

  Copyright 2012-2014 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/ajax

  Exports a single function, that invokes `t5/core/dom:ajaxRequest()` with the provided `url` and a modified version of the `options`.

  - options.method - “post”, “get”, etc., default: “post”.
  - options.element - if provided, the URL will be treated as a server-side event name and the actual URL to be used will be obtained from dom.getEventUrl(url, element)
  - options.contentType - request content, defaults to “application/x-www-form-urlencoded”
  - options.data - optional, additional key/value pairs (for the default content type)
  - options.success - handler to invoke on success. Passed the ResponseWrapper object. Default does nothing.
  - options.failure - handler to invoke on failure (server responds with a non-2xx code). Passed the response. Default will throw the exception
  - options.exception - handler to invoke when an exception occurs (often means the server is unavailable). Passed the exception. Default will generate an exception message and throw an `Error`. Note: not really supported under jQuery, a hold-over from Prototype.
  - options.complete - handler to invoke after success, falure, or exception. The handler is passed no parameters.

  It wraps (or provides) `success`, `exception`, and `failure` handlers, extended to handle a partial page render response (for success), or properly log a server-side failure or client-side exception, including using the `t5/core/exception-frame` module to display a server-side processing exception.

      define ["./pageinit", "./dom", "./exception-frame", "./console", "underscore"],
        (pageinit, dom, exceptionframe, console, _) ->
          (url, options) ->

            complete = ->
              if options.complete
                options.complete()

              return

            if options.hasOwnProperty 'element'
              url = dom.getEventUrl(url, options.element)

            newOptions = _.extend {}, options,

- ¶

  Logs the exception to the console before passing it to the provided exception handler or throwing the exception.

              exception: (exception) ->
                console.error "Request to #{url} failed with #{exception}"

                if options.exception
                  options.exception exception
                else
                  throw exception

                complete()

                return

              failure: (response, failureMessage) ->
                raw = response.header "X-Tapestry-ErrorMessage"
                unless _.isEmpty raw
                  message = window.unescape raw
                  console.error "Request to #{url} failed with '#{message}'."

                  contentType = response.header "content-type"

                  isHTML = contentType and (contentType.split(';')[0] is "text/html")

                  if isHTML
                    exceptionframe response.text
                else
                  console.error failureMessage

                options.failure and options.failure(response)

                complete()

                return

              success: (response) ->
                pageinit.handlePartialPageRenderResponse response, options.success

                complete()

                return

            dom.ajaxRequest url, newOptions