add option to control how history is updated

README.md

@@ -50,6 +50,32 @@ If you'd like to use named hash routes instead, add `data-bespoke-hash` attribut
 </article>
 ```
 
+### Disabling updates
+
+You can prevent the URL from being updated after the initial page load by setting the `update` option to `false`. This switch allows you to respond to incoming changes from the URL, but not continue updating the URL when the slide changes.
+
+```
+bespoke.from('article', [
+  bespoke.plugins.hash({ update: false })
+]);
+```
+
+Default value: `true`
+
+### History control
+
+You can control whether this browser history is updated using the `history` option. A value of `false` overwrites the last history entry each time the slide is changed (assuming the `update` option is not `false`).
+
+```
+bespoke.from('article', [
+  bespoke.plugins.hash({ history: false })
+]);
+```
+
+If updates are disabled and the value of the `history` option is false, the hash will be removed from the URL after the deck is loaded.
+
+Default value: `true`
+
 ## Package managers
 
 ### npm

dist/bespoke-hash.js

@@ -1,16 +1,18 @@
 /*!
  * bespoke-hash v1.0.2
  *
- * Copyright 2014, Mark Dalgleish
+ * Copyright 2015, Mark Dalgleish
  * This content is released under the MIT license
  * http://mit-license.org/markdalgleish
  */
 
 !function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var n;"undefined"!=typeof window?n=window:"undefined"!=typeof global?n=global:"undefined"!=typeof self&&(n=self);var o=n;o=o.bespoke||(o.bespoke={}),o=o.plugins||(o.plugins={}),o.hash=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
-module.exports = function() {
+module.exports = function(opts) {
+  opts = opts || {};
   return function(deck) {
+    var loc = window.location;
     var parseHash = function() {
-      var hash = window.location.hash.slice(1),
+      var hash = loc.hash.slice(1),
         slideNumberOrName = parseInt(hash, 10);
 
       if (hash) {
@@ -36,10 +38,22 @@ module.exports = function() {
     setTimeout(function() {
       parseHash();
 
-      deck.on('activate', function(e) {
-        var slideName = e.slide.getAttribute('data-bespoke-hash');
-        window.location.hash = slideName || e.index + 1;
-      });
+      if (opts.update === false) {
+        if (opts.history === false) {
+          window.history.replaceState(null, null, loc.pathname + loc.search);
+        }
+      }
+      else {
+        deck.on('activate', function(e) {
+          var slideName = e.slide.getAttribute('data-bespoke-hash');
+          if (opts.history === false) {
+            window.history.replaceState(null, null, loc.pathname + loc.search + '#' + (slideName || e.index + 1));
+          }
+          else {
+            loc.hash = slideName || e.index + 1;
+          }
+        });
+      }
 
       window.addEventListener('hashchange', parseHash);
     }, 0);

lib/bespoke-hash.js

@@ -1,7 +1,9 @@
-module.exports = function() {
+module.exports = function(opts) {
+  opts = opts || {};
   return function(deck) {
+    var loc = window.location;
     var parseHash = function() {
-      var hash = window.location.hash.slice(1),
+      var hash = loc.hash.slice(1),
         slideNumberOrName = parseInt(hash, 10);
 
       if (hash) {
@@ -27,10 +29,22 @@ module.exports = function() {
     setTimeout(function() {
       parseHash();
 
-      deck.on('activate', function(e) {
-        var slideName = e.slide.getAttribute('data-bespoke-hash');
-        window.location.hash = slideName || e.index + 1;
-      });
+      if (opts.update === false) {
+        if (opts.history === false) {
+          window.history.replaceState(null, null, loc.pathname + loc.search);
+        }
+      }
+      else {
+        deck.on('activate', function(e) {
+          var slideName = e.slide.getAttribute('data-bespoke-hash');
+          if (opts.history === false) {
+            window.history.replaceState(null, null, loc.pathname + loc.search + '#' + (slideName || e.index + 1));
+          }
+          else {
+            loc.hash = slideName || e.index + 1;
+          }
+        });
+      }
 
       window.addEventListener('hashchange', parseHash);
     }, 0);

test/spec/bespoke-hashSpec.js

@@ -16,7 +16,7 @@ describe("bespoke-hash", function() {
     slides,
     deck;
 
-  var createDeck = function() {
+  var createDeck = function(opts) {
       slides = [];
 
       article = document.createElement(PARENT_TAG);
@@ -34,7 +34,7 @@ describe("bespoke-hash", function() {
       document.body.appendChild(article);
 
       deck = bespoke.from(PARENT_TAG, [
-        hash()
+        hash(opts)
       ]);
 
       // Wait for next tick
@@ -224,4 +224,56 @@ describe("bespoke-hash", function() {
 
   });
 
+  describe("given update mode is deactivated", function() {
+    beforeEach(function() {
+      window.location.hash = 2;
+    });
+
+    [true, false].forEach(function(historyOpt) {
+      describe("when the deck is created with history " + (historyOpt ? 'enabled' : 'disabled'), function() {
+        beforeEach(function() {
+          createDeck({ update: false, history: historyOpt });
+        });
+        afterEach(destroyDeck);
+
+        it("should activate the slide referenced in the hash", function() {
+          expect(deck.slide()).toBe(1);
+          expect(window.location.hash).toBe(historyOpt ? '#2' : '');
+        });
+
+        it("should not update the hash when the slide changes", function() {
+          deck.next();
+          expect(deck.slide()).toBe(2);
+          expect(window.location.hash).toBe(historyOpt ? '#2' : '');
+        });
+      });
+    });
+  });
+
+  describe("given history mode is deactivated", function() {
+    beforeEach(function() {
+      window.location.hash = 2;
+    });
+
+    describe("when the deck is created", function() {
+      beforeEach(function() {
+        createDeck({ history: false });
+      });
+      afterEach(destroyDeck);
+
+      it("should activate the slide referenced in the hash", function() {
+        expect(deck.slide()).toBe(1);
+        expect(window.location.hash).toBe('#2');
+      });
+
+      it("should not add entry to history when the slide changes", function() {
+        var beforeHistoryLength = window.history.length;
+        deck.next();
+        expect(deck.slide()).toBe(2);
+        expect(window.location.hash).toBe('#3');
+        expect(window.history.length).toBe(beforeHistoryLength);
+      });
+    });
+  });
+
 });