Learn how to programmatically format tables and charts, and how to import data to a spreadsheet, in Excel Web Add-ins. Compare with how these tasks are done in the Tables and Charts VSTO Add-in. This Excel web add-in also shows how to use the design samples from Office Add-in UX Design Patterns Code.

• Change History
• Prerequisites
• Design templates used in this add-in
• Get the PickADate library
• Run the project
• Compare this Excel web add-in code with the VSTO add-in sample
• Questions and comments
• Additional resources

November 2, 2016:

• Updated code sample to use Fabric JS 1.2.0
• Initial version.

• Excel 2016 for Windows (build 16.0.6727.1000 or later), Excel Online, or Excel for Mac (build 15.26 or later).
• Visual Studio 2015

• Landing page
• Brand bar
• Tab bar
• Settings

For more information about the design patterns, see UX design pattern templates for Office Add-ins. And for sample implementations, see Office-Add-in-UX-Design-Patterns-Code.

The Office Fabric date picker control has a dependency on the PickADate library. Take the following steps after you have downloaded this sample.

1. Download version 3.5.3 of the library from pickadate.js.
2. Unzip the package and navigate to the \pickadate.js-3.5.3\lib folder.
3. Copy all the files and folders in that folder, except the compressed and themes-source folders, to the project folder: SalesTrackerWeb\Scripts\PickADate.

1. Open the Visual Studio solution file.
2. Press F5.
3. When Excel opens, click the Track sales button on the right end of the Home ribbon. The add-in opens in a task pane.

4. On the Home page, enter one of the following product names (case sensitive) in the Product name box: Keyboard, Mouse, Monitor, Laptop,
5. Use the date picker control to pick a date no later than September 16th, 2016, because there are no sales after this date in the sample data.
6. Select the Get sales data button. After a few seconds, the workbook will switch focus to a new Sales worksheet.

1. Select Table on the tab bar.
2. Deselect radio buttons as needed, to hide the corresponding columns.
3. Select a color for the table.

1. Select Chart on the tab bar.
2. Select a data source for the chart.
3. Select a chart type.
4. Select a chart color theme.

The code that uses the Office and Word JavaScript APIs is in Home.js and Helpers.js. All of the styling is done with HTML5 and the stylesheet files: settings.css, tab.bar.css and several Office Fabric css files.

Compare this code with the code in Tables and Charts. Note the following:

• Excel Web add-ins are supported across several platforms including Windows, Mac, and Office Online. VSTO add-ins are only supported on Windows.
• Changing the style of a table is similar in both VSTO and web add-ins. In both cases, your code assigns a style name, such as TableStyleMedium3 to a property. In the VSTO add-in, this is a table object. (See the various *_CheckedChanged methods in the TableAndChartPane.cs file.) In this web add-in, the property is in a JavaScript object that is passed to the setTableOptionsAsync function. (See the setTableColor function in the helpers.js file.)
• Toggling the visibility of columns in a table is very similar in the VSTO and web add-ins. Compare the logic of the ListObjectHeaders_Click method in the VSTO sample with the toggleColumnVisibility function in the web add-in.
• To change the style of a chart in a VSTO add-in, you assign an integer to the chart object's ChartStyle property. The integer refers to a collection of style settings. See the TableAndChartPane.cs file in the VSTO add-in. In an Excel web add-in you replace the chart with a new one that has the desired style. You can record the current style settings for the chart in a JavaScript object as this sample does in the home.js file. To change a single style setting, your code changes it in the settings object which is then passed to the changeChart function in helpers.js.
• Changing a chart type, such as Line, Area, ClusteredColumn, is very similar in both the VSTO add-in and this web add-in. In both cases a switch-case structure is used to assign a value to a type property. Compare the ChartStyleComboBox_SelectedIndexChanged method in the VSTO sample with the setChartType method in this web sample.
• In an Excel web add-in, like this one, when you want to track a single value over time (or any horizontal axis), the chart must be built off of a table with only two visible columns; one that provides the horizontal axis (dates, in this case), and a second that provides the value that is being displayed in the chart. For this reason, the add-in creates a hidden worksheet with a copy of the sales data table. This table has only two visible columns; the Date column, and the column with the chosen data source for the chart. Although the chart appears on the Sales worksheet beside the table, it is getting it's data from the table on the hidden (temp) worksheet.
• To change the data source for a chart in the Excel web add-in, your code toggles the visibility of the columns on the hidden table. See the setChartDataSource method in the helpers.js file. In a VSTO add-in, your code specifies which column in the table is to be used as the data source by calling the chart object's SetSourceData function. See the chartDataSourceComboBox_SelectedIndexChanged method.
• In Office web add-ins, you can leverage HTML5, JavaScript and CSS to make rich UIs like the UI in this code sample.
• Because Office web add-ins make asynchronous method calls, the UI never blocks.
• Office Web add-ins make AJAX calls to retrieve data from online service providers. This sample simply fetches JSON data from a local JSON file. See the getSalesData method in Helpers.js. VSTO add-ins use a WebClient in C# to access online resources. See the GetDataUpdatesFoOneDataSource method in TableAndChartPane.cs.

We'd love to get your feedback about this sample. You can send your feedback to us in the Issues section of this repository.

Questions about Microsoft Office 365 development in general should be posted to Stack Overflow. If your question is about the Office JavaScript APIs, make sure that your questions are tagged with [office-js] and [API].

• Office add-in documentation
• Office Dev Center
• More Office Add-in samples at OfficeDev on Github

Copyright (c) 2016 Microsoft Corporation. All rights reserved.

This project has adopted the Microsoft Open Source Code of Conduct. For more information, see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.