Fix initializing with high initialIndex;

+ Fixes #291
+ add instant argument for select, fixes #128
+ remove updating in activating page dots and prev/next

js/flickity.js

@@ -120,7 +120,7 @@ Flickity.prototype._create = function() {
   this.element.flickityGUID = id; // expando
   instances[ id ] = this; // associate via id
   // initial properties
-  this.selectedIndex = this.options.initialIndex || 0;
+  this.selectedIndex = 0;
   // how many frames slider has been in same position
   this.restingFrames = 0;
   // initial physics properties
@@ -188,8 +188,19 @@ Flickity.prototype.activate = function() {
 
   this.emit('activate');
 
-  this.positionSliderAtSelected();
-  this.select( this.selectedIndex );
+  var index;
+  var initialIndex = this.options.initialIndex;
+  if ( this.isInitActivated ) {
+    index = this.selectedIndex;
+  } else if ( initialIndex !== undefined ) {
+    index = this.cells[ initialIndex ] ? initialIndex : 0;
+  } else {
+    index = 0;
+  }
+  // select instantly
+  this.select( index, false, true );
+  // flag for initial activation, for using initialIndex
+  this.isInitActivated = true;
 };
 
 // slider positions the cells
@@ -420,8 +431,9 @@ Flickity.prototype.dispatchEvent = function( type, event, args ) {
 /**
  * @param {Integer} index - index of the cell
  * @param {Boolean} isWrap - will wrap-around to last/first if at the end
+ * @param {Boolean} isInstant - will immediately set position at selected cell
  */
-Flickity.prototype.select = function( index, isWrap ) {
+Flickity.prototype.select = function( index, isWrap, isInstant ) {
   if ( !this.isActive ) {
     return;
   }
@@ -439,13 +451,18 @@ Flickity.prototype.select = function( index, isWrap ) {
   if ( this.options.wrapAround || isWrap ) {
     index = utils.modulo( index, len );
   }
-
-  if ( this.cells[ index ] ) {
-    this.selectedIndex = index;
-    this.setSelectedCell();
+  // bail if invalid index
+  if ( !this.cells[ index ] ) {
+    return;
+  }
+  this.selectedIndex = index;
+  this.setSelectedCell();
+  if ( isInstant ) {
+    this.positionSliderAtSelected();
+  } else {
     this.startAnimation();
-    this.dispatchEvent('cellSelect');
   }
+  this.dispatchEvent('cellSelect');
 };
 
 Flickity.prototype.previous = function( isWrap ) {

js/page-dots.js

@@ -68,7 +68,6 @@ PageDots.prototype._create = function() {
 
 PageDots.prototype.activate = function() {
   this.setDots();
-  this.updateSelected();
   this.bindTap( this.holder );
   // add to DOM
   this.parent.element.appendChild( this.holder );

js/prev-next-button.js

@@ -79,6 +79,9 @@ PrevNextButton.prototype._create = function() {
   element.className += this.isPrevious ? ' previous' : ' next';
   // prevent button from submitting form http://stackoverflow.com/a/10836076/182183
   element.setAttribute( 'type', 'button' );
+  // init as disabled
+  this.disable();
+
   Flickity.setUnselectable( element );
   // create arrow
   if ( supportsInlineSVG() ) {
@@ -104,7 +107,6 @@ PrevNextButton.prototype._create = function() {
 };
 
 PrevNextButton.prototype.activate = function() {
-  this.update();
   this.bindTap( this.element );
   // click events from keyboard
   eventie.bind( this.element, 'click', this );

sandbox/single.html

@@ -48,7 +48,8 @@ <h1>single</h1>
 <script>
 window.onload = function() {
 
-  var flkty = window.flkty = new Flickity('#gallery');
+  var flkty = window.flkty = new Flickity('#gallery', {
+  });
 
 };
 </script>

test/unit/empty.js

@@ -27,4 +27,13 @@ test('empty', function() {
   ok( flkty.nextButton.element.disabled, 'next button disabled' );
   equal( flkty.pageDots.dots.length, 1, '1 page dots');
 
+  // destroy and re-init with higher initialIndex
+  flkty.destroy();
+  flkty = new Flickity( gallery, {
+    initialIndex: 2
+  });
+
+  // #291
+  ok( true, 'initializing with initialIndex > cells doesnt throw error' );
+
 });