Added support do do a push-state ajax request with forms

tests/lib/proto/attach-form.js

@@ -0,0 +1,78 @@
+var tape = require("tape")
+
+var on = require("../../../lib/events/on")
+var trigger = require("../../../lib/events/trigger")
+var attachForm = require("../../../lib/proto/attach-form")
+
+var form = document.createElement("form")
+var attr = "data-pjax-click-state"
+var preventDefault = function(e) { e.preventDefault() }
+
+tape("test attach form prototype method", function(t) {
+  t.plan(7)
+
+  attachForm.call({
+    options: {},
+    reload: function() {
+      t.equal(form.getAttribute(attr), "reload", "triggering a simple reload will just submit the form")
+    },
+    loadUrl: function() {
+      t.equal(form.getAttribute(attr), "submit", "triggering a post to the next page")
+    }
+  }, form)
+
+  var internalUri = window.location.protocol + "//" + window.location.host + window.location.pathname + window.location.search
+
+  form.action = "http://external.com/"
+  trigger(form, "submit")
+  t.equal(form.getAttribute(attr), "external", "external url stop behavior")
+
+  form.action = internalUri + "#anchor"
+  trigger(form, "submit")
+  t.equal(form.getAttribute(attr), "anchor-present", "internal anchor stop behavior")
+
+  window.location.hash = "#anchor"
+  form.action = internalUri + "#another-anchor"
+  trigger(form, "submit")
+  t.notEqual(form.getAttribute(attr), "anchor", "differents anchors stop behavior")
+  window.location.hash = ""
+
+  form.action = internalUri + "#"
+  trigger(form, "submit")
+  t.equal(form.getAttribute(attr), "anchor-empty", "empty anchor stop behavior")
+
+  form.action = internalUri
+  trigger(form, "submit")
+  // see reload defined above
+
+  form.action = window.location.protocol + "//" + window.location.host + "/internal"
+  form.method = 'POST'
+  trigger(form, "submit")
+  // see post defined above
+
+  form.action = window.location.protocol + "//" + window.location.host + "/internal"
+  form.method = 'GET'
+  trigger(form, "submit")
+  // see post defined above
+
+  t.end()
+})
+
+tape("test attach form preventDefaulted events", function(t) {
+  var callbacked = false
+  var form = document.createElement("form")
+
+  attachForm.call({
+    options: {},
+    loadUrl: function() {
+      callbacked = true
+    }
+  }, form)
+
+  form.action = "#"
+  on(form, "submit", preventDefault)
+  trigger(form, "submit")
+  t.equal(callbacked, false, "events that are preventDefaulted should not fire callback")
+
+  t.end()
+})