Handle XHR response error (#137)

* Move the XHR callback to a separate file
* Trigger an error event if the response cannot be parsed.
* Add tests for handle-response.js

lib/proto/handle-response.js

@@ -0,0 +1,70 @@
+var clone = require("../util/clone.js")
+var newUid = require("../uniqueid.js")
+var trigger = require("../events/trigger.js")
+
+module.exports = function(responseText, request, href) {
+  var tempOptions = clone(this.options);
+  tempOptions.request = request
+
+  // Fail if unable to load HTML via AJAX
+  if (responseText === false) {
+    trigger(document, "pjax:complete pjax:error", tempOptions)
+
+    return
+  }
+
+  // push scroll position to history
+  var currentState = window.history.state || {}
+  window.history.replaceState({
+      url: currentState.url || window.location.href,
+      title: currentState.title || document.title,
+      uid: currentState.uid || newUid(),
+      scrollPos: [document.documentElement.scrollLeft || document.body.scrollLeft,
+        document.documentElement.scrollTop || document.body.scrollTop]
+    },
+    document.title, window.location)
+
+  // Check for redirects
+  var oldHref = href
+  if (request.responseURL) {
+    if (href !== request.responseURL) {
+      href = request.responseURL
+    }
+  }
+  else if (request.getResponseHeader("X-PJAX-URL")) {
+    href = request.getResponseHeader("X-PJAX-URL")
+  }
+  else if (request.getResponseHeader("X-XHR-Redirected-To")) {
+    href = request.getResponseHeader("X-XHR-Redirected-To")
+  }
+
+  // Add back the hash if it was removed
+  var a = document.createElement("a")
+  a.href = oldHref
+  var oldHash = a.hash
+  a.href = href
+  if (oldHash && !a.hash) {
+    a.hash = oldHash
+    href = a.href
+  }
+
+  this.state.href = href
+  this.state.options = clone(this.options)
+
+  try {
+    this.loadContent(responseText, this.options)
+  }
+  catch (e) {
+    trigger(document, "pjax:error", tempOptions)
+
+    if (!this.options.debug) {
+      if (console && console.error) {
+        console.error("Pjax switch fail: ", e)
+      }
+      return this.latestChance(href)
+    }
+    else {
+      throw e
+    }
+  }
+}

lib/send-request.js

@@ -13,21 +13,21 @@ module.exports = function(location, options, callback) {
   request.onreadystatechange = function() {
     if (request.readyState === 4) {
       if (request.status === 200) {
-        callback(request.responseText, request)
+        callback(request.responseText, request, location)
       }
       else {
-        callback(null, request)
+        callback(null, request, location)
       }
     }
   }
 
   request.onerror = function(e) {
     console.log(e)
-    callback(null, request)
+    callback(null, request, location)
   }
 
   request.ontimeout = function() {
-    callback(null, request)
+    callback(null, request, location)
   }
 
   // Prepare the request payload for forms, if available