[excel, powerpoint] (Create Workbook/Presentation) Update code samples

docs/excel/excel-add-ins-shapes.md

@@ -1,7 +1,7 @@
 ---
 title: Work with shapes using the Excel JavaScript API
 description: ''
-ms.date: 07/19/2019
+ms.date: 09/03/2019
 localization_priority: Normal
 ---
 
@@ -57,8 +57,8 @@ var reader = new FileReader();
 
 reader.onload = (event) => {
     Excel.run(function (context) {
-        var startIndex = event.target.result.indexOf("base64,");
-        var myBase64 = event.target.result.substr(startIndex + 7);
+        var startIndex = reader.result.toString().indexOf("base64,");
+        var myBase64 = reader.result.toString().substr(startIndex + 7);
         var sheet = context.workbook.worksheets.getItem("MyWorksheet");
         var image = sheet.shapes.addImage(myBase64);
         image.name = "Image";

docs/excel/excel-add-ins-workbooks.md

@@ -1,7 +1,7 @@
 ---
 title: Work with workbooks using the Excel JavaScript API
 description: ''
-ms.date: 05/01/2019
+ms.date: 09/03/2019
 localization_priority: Priority
 ---
 
@@ -55,8 +55,8 @@ var reader = new FileReader();
 reader.onload = (function (event) {
     Excel.run(function (context) {
         // strip off the metadata before the base64-encoded string
-        var startIndex = event.target.result.indexOf("base64,");
-        var workbookContents = event.target.result.substr(startIndex + 7);
+        var startIndex = reader.result.toString().indexOf("base64,");
+        var workbookContents = reader.result.toString().substr(startIndex + 7);
 
         Excel.createWorkbook(workbookContents);
         return context.sync();
@@ -87,8 +87,8 @@ var reader = new FileReader();
 reader.onload = (event) => {
     Excel.run((context) => {
         // strip off the metadata before the base64-encoded string
-        var startIndex = event.target.result.indexOf("base64,");
-        var workbookContents = event.target.result.substr(startIndex + 7);
+        var startIndex = reader.result.toString().indexOf("base64,");
+        var workbookContents = reader.result.toString().substr(startIndex + 7);
 
         var sheets = context.workbook.worksheets;
         sheets.addFromBase64(

docs/powerpoint/powerpoint-add-ins.md

@@ -1,7 +1,7 @@
 ---
 title: PowerPoint add-ins
 description: ''
-ms.date: 07/05/2019
+ms.date: 09/03/2019
 ms.topic: overview
 scenarios: getting-started
 localization_priority: Priority
@@ -177,8 +177,8 @@ var reader = new FileReader();
 
 reader.onload = function (event) {
     // strip off the metadata before the base64-encoded string
-    var startIndex = event.target.result.indexOf("base64,");
-    var copyBase64 = event.target.result.substr(startIndex + 7);
+    var startIndex = reader.result.toString().indexOf("base64,");
+    var copyBase64 = reader.result.toString().substr(startIndex + 7);
 
     PowerPoint.createPresentation(copyBase64);
 };
@@ -194,4 +194,4 @@ reader.readAsDataURL(myFile.files[0]);
 - [How to save add-in state and settings per document for content and task pane add-ins](../develop/persisting-add-in-state-and-settings.md#how-to-save-add-in-state-and-settings-per-document-for-content-and-task-pane-add-ins)
 - [Read and write data to the active selection in a document or spreadsheet](../develop/read-and-write-data-to-the-active-selection-in-a-document-or-spreadsheet.md)
 - [Get the whole document from an add-in for PowerPoint or Word](../powerpoint/get-the-whole-document-from-an-add-in-for-powerpoint.md)
-- [Use document themes in your PowerPoint add-ins](use-document-themes-in-your-powerpoint-add-ins.md)
+- [Use document themes in your PowerPoint add-ins](use-document-themes-in-your-powerpoint-add-ins.md)