From 7dcf662fdde72d6b1956f4bc6f447a573499c668 Mon Sep 17 00:00:00 2001
From: Chris Adams <chris@improbable.org>
Date: Fri, 28 Jun 2013 14:32:57 -0400
Subject: [PATCH] Viewer: add a basic error message display system

This might be something we want to make configurable for users who want
to completely control how errors are displayed.

This also adds the first use of OpenSeadragon.makeCenteredNode currently
so we might want to clean up that code as well.
---
 src/viewer.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/viewer.js b/src/viewer.js
index 532f5078..95cfc908 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -174,7 +174,12 @@ $.Viewer = function( options ) {
 
     this.addHandler( 'open-failed', function (source, args) {
         var msg = $.getString( "Errors.Open-Failed", args.source, args.message);
-        window.alert( msg );
+
+        var errorDiv = $.makeNeutralElement( "div" );
+        $.addClass( errorDiv, "modal-dialog error" );
+        errorDiv.appendChild( document.createTextNode( msg ) );
+
+        _this.container.appendChild( $.makeCenteredNode(errorDiv) );
     });
 
     $.ControlDock.call( this, options );
@@ -423,6 +428,13 @@ $.extend( $.Viewer.prototype, $.EventHandler.prototype, $.ControlDock.prototype,
             $TileSource,
             options;
 
+        if (this.container) {
+            var dialogs = this.container.querySelectorAll(".modal-dialog");
+            for (var i = 0; i < dialogs.length; i++) {
+                dialogs[i].parentNode.remove(dialogs[i]);
+            }
+        }
+
         //allow plain xml strings or json strings to be parsed here
         if( $.type( tileSource ) == 'string' ){
             if( tileSource.match(/\s*<.*/) ){