This add in expands all rows to give a detailed reading view.

Expand Rows.EXCEL.yaml

name: Expand Rows
description: This add in expands all rows to give a detailed reading view.
host: EXCEL
api_set: {}
script:
  content: |
    $("#run").click(() => tryCatch(run));

    function run() {
      return Excel.run(function(context) {
        var sheet = context.workbook.worksheets.getActiveWorksheet();
        var range = sheet.getUsedRange(false);

        range.format.autofitRows();

        range.load("rowCount");
        return context.sync().then(function() {
          console.log(range.rowCount);
        });
      });
    }

    /** Default helper for invoking an action and handling errors. */
    function tryCatch(callback) {
      Promise.resolve()
        .then(callback)
        .catch(function(error) {
          // Note: In a production add-in, you'd want to notify the user through your add-in's UI.
          console.error(error);
        });
    }
  language: typescript
template:
  content: "<section class=\"ms-font-m\">\n\t<p class=\"ms-font-m\">This sample demonstrates how to use this addin using Excel API calls.</p>\n</section>\n\n<section class=\"samples ms-font-m\">\n\t<h3>Try it out</h3>\n\t<p class=\"ms-font-m\">Go to the worksheet where you want to have a detailed level view and, then press button\n\t\t<b>Expand Rows to get a detailed view</b>.</p>\n\t<button id=\"run\" class=\"ms-Button\">\n        <span class=\"ms-Button-label\">Expand Rows to get a detailed view</span>\n    </button>\n\t<img src='https://laughtard.com/wp-content/uploads/2017/06/cloths.gif'>\n</section>"
  language: html
style:
  content: |-
    section.samples {
        margin-top: 20px;
    }

    section.samples .ms-Button, section.setup .ms-Button {
        display: block;
        margin-bottom: 5px;
        margin-left: 20px;
        min-width: 80px;
    }
  language: css
libraries: |
  https://appsforoffice.microsoft.com/lib/1/hosted/office.js
  @types/office-js

  office-ui-fabric-js@1.4.0/dist/css/fabric.min.css
  office-ui-fabric-js@1.4.0/dist/css/fabric.components.min.css

  core-js@2.4.1/client/core.min.js
  @types/core-js

  jquery@3.1.1
  @types/jquery@3.3.1