Sample code for WorkSheetCollection.AddFromBase64()

WorkSheetCollection.AddFromBase64().EXCEL.yaml

name: WorkSheetCollection.AddFromBase64()
description: Sample code for WorkSheetCollection.AddFromBase64()
host: EXCEL
api_set: {}
script:
  content: |
    $("#run").click(() => tryCatch(getExcelFileBase64));

    function getExcelFileBase64() {
      var file = document.getElementById("myFile").files[0];
      if (file == null) {
        addFromBase64("");
      }

      var reader = new FileReader();
      reader.onload = (function (theFile) {
        return function (e) {
          var startIndex = e.target.result.indexOf("base64,");
          var mybase64 = e.target.result.substr(startIndex + 7, e.target.result.length);
          addFromBase64(mybase64);
        };
      })(file);

      reader.readAsDataURL(file);
    }

    async function addFromBase64(base64) {
      await Excel.run(async (ctx) => {
        var worksheet = ctx.workbook.worksheets.getActiveWorksheet();
        var newWorkSheets = ctx.workbook.worksheets.addFromBase64(base64, [], Excel.WorksheetPositionType.before, worksheet);
        await ctx.sync();   
        var newSheetNames = "";
        for (var i = 0; i < newWorkSheets.value.length; i++) {
          var newSheet = ctx.workbook.worksheets.getItem(newWorkSheets.value[i]);
          newSheet.load("name");
          await ctx.sync();
          newSheetNames += "\"" + newSheet.name + "\", ";
          //ctx.workbook.worksheets.getItem(newWorkSheets.value[i]).tabColor = getRandomColor();
        }
        console.log("Inserted sheets number: " + newWorkSheets.value.length + ".\nInserted sheets name: " + newSheetNames);
        await ctx.sync();
      });
    }

    function getRandomColor() {
      return "#000000".replace(/0/g, function() {
        return (~~(Math.random() * 16)).toString(16);
      });
    }

    /** Default helper for invoking an action and handling errors. */
    async function tryCatch(callback) {
      try {
        await callback();
      } catch (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 Excel WorkSheetCollection.AddFromBase64() API call.</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\">Please select a file to insert:</p>\n\t<input id=\"myFile\" name=\"myFile\" type=\"file\">\n\t<p class=\"ms-font-m\"></p>\n\t<button id=\"run\" class=\"ms-Button\">\n\t\t<span class=\"ms-Button-label\">Add Sheets From Base64</span>\n  </button>\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://unpkg.com/@microsoft/office-js@1.1.39-custom.28/dist/office.debug.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