From 4e0fe376cfafb5419e0f4e5684d35873322abeac Mon Sep 17 00:00:00 2001
From: Tom Coleman <tom@thesnail.org>
Date: Wed, 17 Sep 2014 11:36:31 +1000
Subject: [PATCH] Allow replaceState via `Location.replaceState` #4

---
 examples/historyState/historyState.js |  6 ++++--
 lib/location.js                       | 22 ++++++++++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/examples/historyState/historyState.js b/examples/historyState/historyState.js
index 04b2816..b98cded 100644
--- a/examples/historyState/historyState.js
+++ b/examples/historyState/historyState.js
@@ -9,11 +9,13 @@ if (Meteor.isClient) {
   Template.hello.events({
     'submit #push': function(e, t) {
       e.preventDefault();
-      Iron.Location.go('/' + Random.id(), {historyState: t.$('input').val()});
+      var state = $(e.target).find('input').val();
+      Iron.Location.go('/' + Random.id(), {historyState: state});
     },
     'submit #replace': function(e, t) {
       e.preventDefault();
-      console.log("Can't do this yet");
+      var state = $(e.target).find('input').val();
+      Iron.Location.replaceState(state);
     }
   })
 }
diff --git a/lib/location.js b/lib/location.js
index 048afc4..a1ea6e6 100644
--- a/lib/location.js
+++ b/lib/location.js
@@ -121,6 +121,21 @@ var onClickHandler = function (e) {
     throw err;
   }
 };
+
+var replaceState = function(historyState) {
+  // XXX: should we throw / warn / do nothing here?
+  if (isUsingHashPaths())
+    throw new Error("Can't replaceState when using hash paths");
+  
+  var state = current;
+  if (EJSON.equals(state.options.historyState, historyState))
+    return;
+
+  state.options.historyState = historyState;
+  history.replaceState(historyState, null, state.url);
+  dep.changed();
+}
+
 /*****************************************************************************/
 /* Location API */
 /*****************************************************************************/
@@ -228,6 +243,13 @@ Location.go = function (url, options) {
   return go(url, options);
 };
 
+/** 
+ * Update the history.state for the given location
+ */
+Location.replaceState = function(historyState) {
+  return replaceState(historyState);
+}
+
 /**
  * Automatically start Iron.Location
  */