docs.sheetjs.com/docz/docs/03-demos/02-frontend/07-angularjs.md

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:::warning pass

This demo is for the legacy AngularJS framework (version 1).

"Angular" now commonly refers to the new framework starting with version 2. The "Angular" demo covers the new framework.

:::

AngularJS is a JS library for building user interfaces.

SheetJS is a JavaScript library for reading and writing data from spreadsheets.

This demo uses AngularJS and SheetJS to process and generate spreadsheets. We'll explore how to load SheetJS in AngularJS projects and compare common state models and data flow strategies.

Live Demo

:::note Tested Deployments

This demo was tested in the following environments:

Version	Date
1.8.2 (latest)	2023-12-04
1.2.32 (legacy)	2023-12-04

:::

Click here for a live standalone integration demo.

The demo uses an array of objects as its internal state. It fetches and displays data on load. It also includes a button for exporting data to file and a file input element for loading user-submitted files.

Installation

The SheetJS Standalone scripts can be referenced in a SCRIPT tag from the HTML entry point page.

The script adds the XLSX global variable.

Data Sources

Modern browsers support a number of convenient APIs for receiving files and allowing users to submit files.

AngularJS, relevant in an era before the APIs were available, provides wrappers to simplify network and file processing.

Remote Files

To download files from a remote location, the $http service can perform GET requests¹

The responseType option is directly passed to XMLHttpRequest. Setting the property to "arraybuffer" ensures the result is an ArrayBuffer object.

The SheetJS read method can parse the ArrayBuffer and return a SheetJS workbook object².

The following controller fetches a sample file, parses the result into a workbook, extracts the first worksheet, and uses the SheetJS sheet_to_html method to generate a HTML table:

/* The controller function must accept a `$http` argument */
app.controller('sheetjs', function($scope, $http) {
  /* fetch https://sheetjs.com/pres.xlsx */
  $http({
    method:'GET', url:'https://sheetjs.com/pres.xlsx',
    /* ensure the result is an ArrayBuffer object */
    responseType:'arraybuffer'
  }).then(function(data) {
    // highlight-next-line
    var wb = XLSX.read(data.data);
    /* generate HTML from first worksheet*/
    var ws = wb.Sheets[wb.SheetNames[0]];
    var html = XLSX.utils.sheet_to_html(ws);
    /* assign to the `tbl` scope property */
    $scope.tbl = html;
  }, function(err) { console.log(err); });
});

User-Submitted Files

Users can submit files using HTML file input elements. A DOM change event is created when users select a file.

In AngularJS, standard DOM event handlers are created using custom directives with the link option³.

The following directive function creates a change event handler that will use a FileReader to generate an ArrayBuffer object with the file data, parse the file data using the SheetJS read method, generate a HTML table using sheet_to_html, and store the result in the tbl property of the app state:

function SheetJSImportDirective() { return {
  scope: false,
  /* $elm will be a reference to the file input DOM element */
  link: function ($scope, $elm) {
    /* add a `change` event handler */
    $elm.on('change', function (changeEvent) {
      /* use a FileReader to read the file */
      var reader = new FileReader();
      reader.onload = function (e) {
        /* this event handler will be called once the data is read */
        var wb = XLSX.read(e.target.result);

        /* generate HTML from first worksheet*/
        var ws = wb.Sheets[wb.SheetNames[0]];
        var html = XLSX.utils.sheet_to_html(ws);

        /* assign to the `tbl` scope property */
        $scope.apply(function() { $scope.tbl = html; });
      };
      /* read */
      reader.readAsArrayBuffer(changeEvent.target.files[0]);
    });
  }
}; }

This functionality can be added to the app in two steps:

1. Add an INPUT element with attribute import-sheet-js="":

<input type="file" import-sheet-js="" multiple="false"  />

2. Define the importSheetJs directive that attaches SheetJSImportDirective:

app.directive("importSheetJs", [SheetJSImportDirective]);

:::note pass

AngularJS normalizes the hyphenated attribute import-sheet-js to the importSheetJs camel-case directive name.

:::

Internal State

The various SheetJS APIs work with various data shapes. The preferred state depends on the application.

Array of Objects

The example presidents sheet has one header row with "Name" and "Index" columns. The natural JS representation is an object for each row, using the values in the first rows as keys:

Spreadsheet	State
	[ { Name: "Bill Clinton", Index: 42 }, { Name: "GeorgeW Bush", Index: 43 }, { Name: "Barack Obama", Index: 44 }, { Name: "Donald Trump", Index: 45 }, { Name: "Joseph Biden", Index: 46 } ]

The SheetJS sheet_to_json method generates row objects from worksheets. The following controller parses a remote file, generates row objects, and stores the array in the state:

app.controller('sheetjs', function($scope, $http) {
  $http({
    url:'https://sheetjs.com/pres.xlsx',
    method:'GET', responseType:'arraybuffer'
  }).then(function(data) {
    var wb = XLSX.read(data.data);
    // highlight-next-line
    $scope.data = XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]);
  }, function(err) { console.log(err); });
});

A component will typically loop over the data using ng-repeat. The following template generates a TABLE with a row for each President:

<table id="sjs-table">
  <tr><th>Name</th><th>Index</th></tr>
  <tr ng-repeat="row in data track by $index">
    <td>{{row.Name}}</td>
    <td>{{row.Index}}</td>
  </tr>
</table>

The json_to_sheet method can generate a worksheet from the data:

/* assuming $scope.data is an array of objects */
$scope.exportSheetJS = function() {
  /* generate a worksheet */
  var ws = XLSX.utils.json_to_sheet($scope.data);
  /* add to workbook */
  var wb = XLSX.utils.book_new();
  XLSX.utils.book_append_sheet(wb, ws, "Presidents");
  /* write workbook and force a download */
  XLSX.writeFile(wb, "SheetJSAngularJSAoO.xlsx");
};

Complete Example (click to show)

1. Save the following to index.html:

{`\

<html ng-app="s5s"> <head> </head>

SheetJS + AngularJS demo

\n\

Export Table

Name	Index
{{row.Name}}	{{row.Index}}

\n\ </html>`}

2. Start a local web server with npx http-server . and access the displayed URL with a web browser (typically http://localhost:8080)

HTML

The main disadvantage of the Array of Objects approach is the specific nature of the columns. For more general use, passing around an Array of Arrays works. However, this does not handle merge cells well!

The sheet_to_html function generates HTML that is aware of merges and other worksheet features. The generated HTML does not contain any <script> tags, and should therefore be safe to pass to an ng-bind-html binding. This approach requires the ngSanitize plugin⁴.

<div ng-controller="sheetjs">
  <!-- highlight-next-line -->
  <div ng-bind-html="data" id="tbl"></div>
</div>

<script>
// highlight-next-line
var app = angular.module('s5s', ['ngSanitize']);
app.controller('sheetjs', function($scope, $http) {
  $http({
    url:'https://sheetjs.com/pres.xlsx',
    method:'GET', responseType:'arraybuffer'
  }).then(function(data) {
    var wb = XLSX.read(data.data);
    // highlight-next-line
    $scope.data = XLSX.utils.sheet_to_html(wb.Sheets[wb.SheetNames[0]]);
  }, function(err) { console.log(err); });
});
</script>

The HTML table can be directly exported with table_to_book:

  $scope.exportSheetJS = function() {
    /* export table element */
    // highlight-start
    var tbl = document.getElementById("tbl").getElementsByTagName("TABLE")[0];
    var wb = XLSX.utils.table_to_book(tbl);
    // highlight-end
    XLSX.writeFile(wb, "SheetJSAngularJSHTML.xlsx");
  };

Complete Example (click to show)

1. Save the following to index.html:

{`\

<html ng-app="s5s"> <head> </head>

SheetJS + AngularJS demo

\n\

Export Table

\n\ </html>`}

2. Start a local web server with npx http-server . and access the displayed URL with a web browser (typically http://localhost:8080)

---

1. See $http in the AngularJS documentation. ↩︎

2. See "Workbook Object" ↩︎

3. See "Creating Directives" in the AngularJS documentation. ↩︎

4. See ngSanitize in the AngularJS documentation. ↩︎