From bb6875569902cd0e51f4397e7900d311ad58cfc8 Mon Sep 17 00:00:00 2001
From: Robert Saric <robert.saric@gmail.com>
Date: Sun, 14 May 2017 15:56:21 +0200
Subject: [PATCH] fix for #1191 (extension of Viewer.open() function with
 initialPage argument)

---
 src/viewer.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/viewer.js b/src/viewer.js
index ec4c8242..1ac95a0e 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -96,6 +96,12 @@ $.Viewer = function( options ) {
         //internal state and dom identifiers
         id:             options.id,
         hash:           options.hash || nextHash++,
+        /**
+         * If sequenceMode is true, display this page initially for the given tileSources.
+         * @member {Number} initialPage
+         * @memberof OpenSeadragon.Viewer#
+         */
+        initialPage:    0,
 
         //dom nodes
         /**
@@ -481,11 +487,13 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
      * except for the index property; images are added in sequence.
      * A TileSource specifier is anything you could pass as the tileSource property
      * of the options parameter for {@link OpenSeadragon.Viewer#addTiledImage}.
+     * @param {Number} initialPage - If sequenceMode is true, display this page initially
+     * for the given tileSources. If specified, will overwrite the existing homonymous option.
      * @return {OpenSeadragon.Viewer} Chainable.
      * @fires OpenSeadragon.Viewer.event:open
      * @fires OpenSeadragon.Viewer.event:open-failed
      */
-    open: function (tileSources) {
+    open: function (tileSources, initialPage) {
         var _this = this;
 
         this.close();
@@ -500,6 +508,10 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
                 this.referenceStrip = null;
             }
 
+            if (typeof initialPage != 'undefined' && !isNaN(initialPage)) {
+              this.initialPage = initialPage;
+            }
+
             this.tileSources = tileSources;
             this._sequenceIndex = Math.max(0, Math.min(this.tileSources.length - 1, this.initialPage));
             if (this.tileSources.length) {