1. Excel JavaScript API Update
Juan Balmori
Program Manager Excel.js

2. Microsoft Build 2017
11/20/2018 4:43 AM
Office Add-ins
Extend Office applications across platforms using web technologies. Distribute via store or your company catalog via centralized deployment.
(with Office.js)
HTML
manifest.xml
Your own web app
Office Add-in
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. Excel API Releases 1.7 GA!! NEW Excel APIs in Preview! 2015 2016 2017
11/20/2018 4:43 AM
Excel API Releases
2015
2016
2017
2018
Application/ Calculate
Worksheet
Workbook
Range
Table
Chart
#1.1
Named item (read)
Filter
Sort
Worksheet Functions
Protection
#1.2
Range view (filtered)
Pivot Table (refresh)
#1.3
Named Item (write)
Settings
Events
#1.4
Custom XML Parts
#1.5
New Range functions
Conditional Formatting
Calculate
(range, worksheet)
#1.6
#1.7
Events
Styles
Chart enhancements
Password Protection
Copy Worksheet
Gridlines, tabs, etc.
Same evolution is taking place across all of the Office client APIs.
Have many people working on Excel APIs. On verge of Excel 1.7 GA (in preview now).
We did an analysis of all the COM add-ins to determine what APIs are needed to support the top 2/3 by usage; these are being addressed in quarterly updates.
NEW Excel APIs in Preview!
More events!
Data validation
Create Workbook
Shapes W1
Pivot W1
Areas
Charts W2
Range
Worksheet
Application
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

4. 11/20/2018 4:43 AM
ExcelApi 1.7
Customize appearance, copy and protect, gain deeper understanding of data.
Chart trendline
Add/set chart series
Axis unit/title
Title and data label set
Access built-in properties
Set custom properties
Apply built-in style
Create/apply custom styles
Copy worksheet within same workbook
Password protection
Workbook protection
Set tab color
Turn gridlines on/off
Freeze rows, columns
Read frozen pane
Available on Win32, Excel online, Mac and iPad.
© Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

5. ExcelApi 1.7 More features Make your solutions more interactive.
Get range as image
Get active cell
Refresh data connections
Get workbook name
New range methods
Get/Set hyperlink
Named item formula and array- values, type
Range format additions
New event APIs
Object level
onActivated
onDeactivated
Worksheet
WorksheetCollection
onAdded
onChanged
Table
TableCollection
onSelectionChanged

6. Demo
Excel JS API 1.7 & New Preview samples
in Script Lab

7. Identifying Challenges: Two Approaches
Data-Driven
Based on telemetry data (API usage, latency), engineering team analyzes and optimizes Excel back end – no changes required to your code.
Customer-Driven
Based on developer feedback (Stack Overflow, GitHub), our team publishes best-practices guidance.

8. Data-Driven Improvements
Data import is a common fundamental scenario, so this has been a major area of focus.
Range-write API performance for data import has been significantly improved (and has started rolling out to builds across all platforms):
~1K cells – 88% improvement
~10K cells – 90% improvement
~100K cells – 57% improvement
Worksheet-add performance has been improved by 92%
Next focus area: adding table rows

9. Performance Feedback: example
This issue led to both internal performance optimizations in Excel, and publication of best-practices guidance.

10. Customer-Driven Improvements
We have started publishing best-practices guidance and code samples for specific scenarios.
Scenarios covered to date:
Minimize the number of sync() calls
Minimize the number of proxy objects created
Load necessary properties only
Suspend calculation temporarily
Update all cells in a range
Importing data into tables

11. Summary Excel 1.7 APIs GA! Excel New Beta APIs Perf Improvements!
Help us get better and more APIs:
Uservoice
Stack overflow #office-js

12. Thanks!