I am able to read Excel file via FileReader but it outputs text as well as weird characters with it. I need to read xls file row-wise, read data in every column and convert it to JSON.
How to read xls file row by row?
Below Function converts the Excel sheet (XLSX format) data to JSON. you can add promise to the function.
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script>
<script>
var ExcelToJSON = function() {
this.parseExcel = function(file) {
var reader = new FileReader();
reader.onload = function(e) {
var data = e.target.result;
var workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function(sheetName) {
// Here is your object
var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
var json_object = JSON.stringify(XL_row_object);
console.log(json_object);
})
};
reader.onerror = function(ex) {
console.log(ex);
};
reader.readAsBinaryString(file);
};
};
</script>
Below post has the code for XLS format Excel to JSON javascript code?
Old question, but I should note that the general task of parsing XLS files from javascript is tedious and difficult but not impossible.
I have basic parsers implemented in pure JS:
http://oss.sheetjs.com/js-xls/ (XLS files, what you wanted)
http://oss.sheetjs.com/js-xlsx/ (XLSX/XLSM/XLSB files)
Both pages are HTML5 File API-driven XLS/XLSX parsers (you can drag-drop your file and it will print out the data in the cells in a comma-separated list). You can also generate JSON objects (assuming the first row is a header row).
The test suite http://oss.sheetjs.com/ shows a version that uses XHR to get and parse files.
Upload an excel file here and you can get the data in JSON format in console:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script>
<script>
var ExcelToJSON = function() {
this.parseExcel = function(file) {
var reader = new FileReader();
reader.onload = function(e) {
var data = e.target.result;
var workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function(sheetName) {
// Here is your object
var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
var json_object = JSON.stringify(XL_row_object);
console.log(JSON.parse(json_object));
jQuery('#xlx_json').val(json_object);
})
};
reader.onerror = function(ex) {
console.log(ex);
};
reader.readAsBinaryString(file);
};
};
function handleFileSelect(evt) {
var files = evt.target.files; // FileList object
var xl2json = new ExcelToJSON();
xl2json.parseExcel(files[0]);
}
</script>
<form enctype="multipart/form-data">
<input id="upload" type=file name="files[]">
</form>
<textarea class="form-control" rows=35 cols=120 id="xlx_json"></textarea>
<script>
document.getElementById('upload').addEventListener('change', handleFileSelect, false);
</script>
This is a combination of the following Stackoverflow posts:
https://stackoverflow.com/a/37083658/4742733
https://stackoverflow.com/a/39515846/4742733
Good Luck...
This code can help youMost of the time jszip.js is not working so include xlsx.full.min.js in your js code.
Html Code
<input type="file" id="file" ng-model="csvFile"
onchange="angular.element(this).scope().ExcelExport(event)"/>
Javascript
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.10.8/xlsx.full.min.js">
</script>
$scope.ExcelExport= function (event) {
var input = event.target;
var reader = new FileReader();
reader.onload = function(){
var fileData = reader.result;
var wb = XLSX.read(fileData, {type : 'binary'});
wb.SheetNames.forEach(function(sheetName){
var rowObj =XLSX.utils.sheet_to_row_object_array(wb.Sheets[sheetName]);
var jsonObj = JSON.stringify(rowObj);
console.log(jsonObj)
})
};
reader.readAsBinaryString(input.files[0]);
};
If you want the simplest and tiniest way of reading an *.xlsx file in a browser then this library might do:
https://catamphetamine.gitlab.io/read-excel-file/
<input type="file" id="input" />
import readXlsxFile from 'read-excel-file'
const input = document.getElementById('input')
input.addEventListener('change', () => {
readXlsxFile(input.files[0]).then((data) => {
// `data` is an array of rows
// each row being an array of cells.
})
})
In the example above data is raw string data.
It can be parsed to JSON with a strict schema by passing schema argument. See API docs for an example of that.
API docs:
http://npmjs.com/package/read-excel-file
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/jszip.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.8.0/xlsx.js"></script>
<script>
var ExcelToJSON = function() {
this.parseExcel = function(file) {
var reader = new FileReader();
reader.onload = function(e) {
var data = e.target.result;
var workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function(sheetName) {
// Here is your object
var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
var json_object = JSON.stringify(XL_row_object);
console.log(JSON.parse(json_object));
jQuery( '#xlx_json' ).val( json_object );
})
};
reader.onerror = function(ex) {
console.log(ex);
};
reader.readAsBinaryString(file);
};
};
function handleFileSelect(evt) {
var files = evt.target.files; // FileList object
var xl2json = new ExcelToJSON();
xl2json.parseExcel(files[0]);
}
</script>
<form enctype="multipart/form-data">
<input id="upload" type=file name="files[]">
</form>
<textarea class="form-control" rows=35 cols=120 id="xlx_json"></textarea>
<script>
document.getElementById('upload').addEventListener('change', handleFileSelect, false);
</script>
Thank you for the answer above, I think the scope (of answers) is completed but I would like to add a "react way" for whoever using react.
Create a file called importData.js:
import React, {Component} from 'react';
import XLSX from 'xlsx';
export default class ImportData extends Component{
constructor(props){
super(props);
this.state={
excelData:{}
}
}
excelToJson(reader){
var fileData = reader.result;
var wb = XLSX.read(fileData, {type : 'binary'});
var data = {};
wb.SheetNames.forEach(function(sheetName){
var rowObj =XLSX.utils.sheet_to_row_object_array(wb.Sheets[sheetName]);
var rowString = JSON.stringify(rowObj);
data[sheetName] = rowString;
});
this.setState({excelData: data});
}
loadFileXLSX(event){
var input = event.target;
var reader = new FileReader();
reader.onload = this.excelToJson.bind(this,reader);
reader.readAsBinaryString(input.files[0]);
}
render(){
return (
<input type="file" onChange={this.loadFileXLSX.bind(this)}/>
);
}
}
Then you can use the component in the render method like:
import ImportData from './importData.js';
import React, {Component} from 'react';
class ParentComponent extends Component{
render(){
return (<ImportData/>);
}
}
<ImportData/> would set the data to its own state, you can access Excel data in the "parent component" by following this:
readExcelFile = async ( file ) =>
{
const fileReader = new FileReader();
fileReader.readAsArrayBuffer( file );
fileReader.onload = ( e ) =>
{
const bufferArray = e.target.result;
const wb = XLSX.read( bufferArray, { type: "buffer" } );
const wsname = wb.SheetNames[ 0 ];
const ws = wb.Sheets[ wsname ];
const data = XLSX.utils.sheet_to_json( ws );
console.log(data);
};
};
<input type="file" name="excelfile" id="excelfile" readExcelFile(file)>
Simplest way to do it using CDN with plain javascript
<script src="https://unpkg.com/read-excel-file#5.x/bundle/read-excel-file.min.js"></script>
<html>
<h1>read-excel-file</h1>
</html>
<script>
var input = document.createElement("INPUT");
input.setAttribute("type", "file");
document.body.appendChild(input)
input.addEventListener('change', function() {
readXlsxFile(input.files[0]).then(function(rows) {
console.log(rows)
})
})
</script>
Simplest way to it using plain javascript.
If you are ever wondering how to read a file from server this code might be helpful.
Restrictions :
File should be in the server (Local/Remote).
You will have to setup headers or have CORS google plugin.
<Head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script lang="javascript" src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.12.4/xlsx.core.min.js"></script>
</head>
<body>
<script>
/* set up XMLHttpRequest */
// replace it with your file path in local server
var url = "http://localhost/test.xlsx";
var oReq = new XMLHttpRequest();
oReq.open("GET", url, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(e) {
var arraybuffer = oReq.response;
/* convert data to binary string */
var data = new Uint8Array(arraybuffer);
var arr = new Array();
for (var i = 0; i != data.length; ++i) {
arr[i] = String.fromCharCode(data[i]);
}
var bstr = arr.join("");
var cfb = XLSX.read(bstr, { type: 'binary' });
cfb.SheetNames.forEach(function(sheetName, index) {
// Obtain The Current Row As CSV
var fieldsObjs = XLS.utils.sheet_to_json(cfb.Sheets[sheetName]);
fieldsObjs.map(function(field) {
$("#my_file_output").append('<input type="checkbox" value="' + field.Fields + '">' + field.Fields + '<br>');
});
});
}
oReq.send();
</script>
</body>
<div id="my_file_output">
</div>
</html>
include the xslx.js , xlsx.full.min.js , jszip.js
add a onchange event handler to the file input
function showDataExcel(event)
{
var file = event.target.files[0];
var reader = new FileReader();
var excelData = [];
reader.onload = function (event) {
var data = event.target.result;
var workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function (sheetName) {
// Here is your object
var XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
for (var i = 0; i < XL_row_object.length; i++)
{
excelData.push(XL_row_object[i]["your column name"]);
}
var json_object = JSON.stringify(XL_row_object);
console.log(json_object);
alert(excelData);
})
};
reader.onerror = function (ex) {
console.log(ex);
};
reader.readAsBinaryString(file);
}
This is for react js
import React, { useState } from "react";
import logo from "./logo.svg";
import "./App.css";
import * as XLSX from "xlsx";
function App() {
const [items, setItems] = useState([]);
const readExcel = (file) => {
const promise = new Promise((resolve, reject) => {
const fileReader = new FileReader();
fileReader.readAsArrayBuffer(file);
fileReader.onload = (e) => {
const bufferArray = e.target.result;
const wb = XLSX.read(bufferArray, { type: "buffer" });
const wsname = wb.SheetNames[0];
const ws = wb.Sheets[wsname];
const data = XLSX.utils.sheet_to_json(ws);
resolve(data);
};
fileReader.onerror = (error) => {
reject(error);
};
});
promise.then((d) => {
setItems(d);
});
};
return (
<div>
<input
type="file"
onChange={(e) => {
const file = e.target.files[0];
readExcel(file);
}}
/>
<table class="table container">
<thead>
<tr>
<th scope="col">Item</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
{items.map((d) => (
<tr key={d.Item}>
<th>{d.Item}</th>
<td>{d.Description}</td>
</tr>
))}
</tbody>
</table>
</div>
);
}
export default App;
Below code will work in reading XLSX file using Javascript
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.7.7/xlsx.core.min.js"></script>
<script>
function handleFile(e)
{
//Get the files from Upload control
var files = e.target.files;
var i, f;
var title;
var choice;
//Loop through files
for (i = 0, f = files[i]; i != files.length; ++i)
{
var reader = new FileReader();
var name = f.name;
reader.onload = function(e)
{
debugger;
var data = e.target.result;
var result;
var workbook = XLSX.read(data,
{
type: 'binary'
});
var sheet_name_list = workbook.SheetNames;
var roa;
sheet_name_list.forEach(function(y)
{
/* iterate through sheets */
//Convert the cell value to Json
roa = XLSX.utils.sheet_to_json(workbook.Sheets[y]);
if (roa.length > 0)
{
result = roa;
}
});
};
reader.readAsArrayBuffer(f);
}
}
$(document).ready(function()
{
$('#files').change(handleFile);
});
</script>
<input type="file" id="files" name="files"/>
The weird characters you got from reading the Excel file from the FileReader API comes from the structure of the file that differs a lot from a text file.
So reading it as text with the FileReader API will give those weirds character as a result.
What you can do is to use the FileReader API to read it as a binary string.
At this point if you try to log that binary string you will also get weirds characters.
In order to get your file content you need to parse that binary string to extract the data it contains. This can be done quite easily using SheetJS.
import { read, writeFileXLSX, utils } from "https://cdn.sheetjs.com/xlsx-0.18.7/package/xlsx.mjs";
const workbook = read(data, {
type:'binary',
});
data is the binary string resulting from reading an Excel file as a binary string with the FileReader API.
workbook is an object that contains all the data of your file.
The workbook.Sheets instruction will give you access to all the sheets that are in the file.
workbook.Sheets.sheet1 will give you access to the content of the first sheet of the file.
All the related arrays are from the {key:value} type.
The content of a sheet accessed this way is a single dimension object array wich contains all the cells of the sheet starting from the first cell of the header to the last cell wich contains data. Each of those cells has a key like this 'A1', 'B250', 'J3'
This array also have two more entries with those keys '!margin' and '!ref':
'!margin' refers to cells margins so it may not represent any interest.
'!ref' is more interesting as it contains the plage of cells containing data wich is a string like this 'A1:J215' from it you could get the amount of lines or the char of the last column.
If you want more informations you could check the SheetJS documentation and there is a more detailed example here : How to read an excel file contents on client side?
Note :
If you want to use this import statement in an html page you'll need to do it inside those scripts tags : <script type="module" defer> ... </script>
Here is a codepen where you can test this method. There's only the most basic method. There are some shorter ways to do the same by using the SheetJS utils functions to convert directly the sheet content to another format.
XLS is a binary proprietary format used by Microsoft. Parsing XLS with server side languages is very difficult without using some specific library or Office Interop. Doing this with javascript is mission impossible. Thanks to the HTML5 File API you can read its binary contents but in order to parse and interpret it you will need to dive into the specifications of the XLS format. Starting from Office 2007, Microsoft embraced the Open XML file formats (xslx for Excel) which is a standard.
var excel=new ActiveXObject("Excel.Application");
var book=excel.Workbooks.Open(your_full_file_name_here.xls);
var sheet=book.Sheets.Item(1);
var value=sheet.Range("A1");
when you have the sheet. You could use VBA functions as you do in Excel.
The excel file will consist of images and record based on it, I am trying to parse it into JSON object but the image field will not be there, I am using xlsx library for parsing it. thanks for any help...
if(inputElement.files[0].name.match(/.(xlsx)$/i) || inputElement.files[0].name.match(/.(xls)$/i)){
let fileReader = new FileReader();
fileReader.readAsBinaryString(inputElement.files[0]);
fileReader.onload = (event)=>{
let data = event.target.result;
let workbook = XLSX.read(data,{type:"binary"});
workbook.SheetNames.forEach(sheet => {
let rowObject = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheet]);
console.log(rowObject);
});
}
}
so I have this app where I upload a csv file using FileUploader. However now my requirement is to also allow excel files. The problem is that FileUploader doesn't support excel as it reads garbage. This is my attempt at parsing an excel file based on this example http://oss.sheetjs.com/js-xlsx/
Code:
var fileUpload = this.getView().byId("fileUploader");
var domRef = fileUpload.getFocusDomRef();
var file = domRef.files[0];
var XLSX = new ExcelPlus();
XLSX.createFile(["CT_MAIN"]);
var reader = new FileReader();
reader.onload = function(e) {
var strCSV = e.target.result;
var arr = String.fromCharCode.apply(null, new
Uint8Array(strCSV));
// var arr = fixData(strCSV);
console.log('data');
console.log(arr);
var workbook = XLSX.read(arr, {type : 'base64'});
console.log('output');
console.log(workbook);
//var output = toCsv(workbook);
//each one of the rows in the csv file
//var rows = arr;//strCSV.split("\n");
var rows = arr.split("\n");
.....
};
//reader.readAsText(file);
reader.readAsArrayBuffer(file);
//reader.readAsBinaryString(file);
If I upload a csv file using this code everything works fine. If I use an excel file I get the following
[1][Content_Types].xml ¢ [1]( [1]¬”ËNÃ0E÷HüCä-Jܲ#5í‚Ç Q>Àēƪc[žiiÿž‰ûB¡ j7± ÏÜ{2ñÍh²nm¶‚ˆÆ»R‹ÈÀU^7/ÅÇì%¿’rZYï #1__f›˜q·ÃR4DáAJ¬h >€ãÚÇV ßƹ
ªZ¨9ÈÛÁàNVÞ 8Ê©ÓãÑ Ôji){^óã-I‹"{Üv^¥P!XS)bR¹rú—K¾s(¸3Õ`c[1]Þ0†½
ÝÎß»¾7 M4²©ŠôªZÆk+¿|\|z¿(Ž‹ôPúº6 h_-[ž#!‚ÒØPk‹´¬2nÏ}Ä? £LËð Ýû%á ÄßdºždN"m,à¥ÇžDO97‚~§Èɸ8ÀOíc |n¦Ñä Eøÿ ö éºóÀBÉÀ!$}‡íàÈé;{ìÐå[ƒîñ–é2þÿÿ
what am I doing wrong, or what am I missing here?
Edit: after doing var workbook = XLSX.read(arr, {type : 'base64'}); I get null for both file types. The above garbage log comes from console.log(arr);
Since you are getting the file from the domRef you wouldn't need ExcelPlus. You just need to read the file as a binary string using xlsx. You will have to include the xlsx.full.min.js in your script.
var fileUpload = this.getView().byId("fileUploader");
var domRef = fileUpload.getFocusDomRef();
var file = domRef.files[0];
//var XLSX = new ExcelPlus();
//XLSX.createFile(["CT_MAIN"]);
var reader = new FileReader();
var name = file.name;
reader.onload = function (e) {
var data = e.target.result;
var workbook = XLSX.read(data, { type: 'binary' });
var result = {};
workbook.SheetNames.forEach(function (sheetName) {
var rObjArr = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
if (rObjArr.length > 0) {
result[sheetName] = rObjArr;
}
});
var output = JSON.stringify(result, 2, 2);
console.log('output');
console.log(output);
};
reader.readAsBinaryString(file);
I have text file and I would like to grab everything but my first line. Also I would like to check how many columns have each of my rows. How that can be done with JavaScript File Reader? I have used code bleow for reading just the first row:
var fileExist = $('#fileUpload')[0];
var reader = new FileReader();
var file = fileExist.files[0];
reader.onload = function(e) {
var text = reader.result;
var firstLine = text.split('\n').shift();
var columnNames = firstLine.split('\t');
console.log(columnNames);
}
reader.readAsText(file, 'UTF-8');
Just get rid of the first line with pop() and then iterate through the Array.
var fileExist = $('#fileUpload')[0];
var reader = new FileReader();
var file = fileExist.files[0];
reader.onload = function (e) {
var text = reader.result;
var allLines = text.split('\n');
// Print the colomn names
console.log(allLines.pop().split('\t'));
// Get rid of first line
allLines.pop();
// Print all the other lines
allLines.forEach(function (line) {
console.log(line.split('\t'));
});
}
reader.readAsText(file, 'UTF-8');
I want to convert excel sheet data to json. It has to be dynamic, so there is an upload button where user uploads the excel sheet and the data is then converted into json. Could you please provide me the javascript code? I tried SheetJS but couldn't figure out. I would prefer something straight forward :)
I really appreciate your help!
NOTE: Not 100% Cross Browser
Check browser compatibility # http://caniuse.com/#search=FileReader
as you will see people have had issues with the not so common browsers, But this could come down to the version of the browser.. I always recommend using something like caniuse to see what generation of browser is supported... This is only a working answer for the user, not a final copy and paste code for people to just use..
The Fiddle: http://jsfiddle.net/d2atnbrt/3/
THE HTML CODE:
<input type="file" id="my_file_input" />
<div id='my_file_output'></div>
THE JS CODE:
var oFileIn;
$(function() {
oFileIn = document.getElementById('my_file_input');
if(oFileIn.addEventListener) {
oFileIn.addEventListener('change', filePicked, false);
}
});
function filePicked(oEvent) {
// Get The File From The Input
var oFile = oEvent.target.files[0];
var sFilename = oFile.name;
// Create A File Reader HTML5
var reader = new FileReader();
// Ready The Event For When A File Gets Selected
reader.onload = function(e) {
var data = e.target.result;
var cfb = XLS.CFB.read(data, {type: 'binary'});
var wb = XLS.parse_xlscfb(cfb);
// Loop Over Each Sheet
wb.SheetNames.forEach(function(sheetName) {
// Obtain The Current Row As CSV
var sCSV = XLS.utils.make_csv(wb.Sheets[sheetName]);
var oJS = XLS.utils.sheet_to_row_object_array(wb.Sheets[sheetName]);
$("#my_file_output").html(sCSV);
console.log(oJS)
});
};
// Tell JS To Start Reading The File.. You could delay this if desired
reader.readAsBinaryString(oFile);
}
This also requires https://cdnjs.cloudflare.com/ajax/libs/xls/0.7.4-a/xls.js to convert to a readable format, i've also used jquery only for changing the div contents and for the dom ready event.. so jquery is not needed
This is as basic as i could get it,
EDIT - Generating A Table
The Fiddle: http://jsfiddle.net/d2atnbrt/5/
This second fiddle shows an example of generating your own table, the key here is using sheet_to_json to get the data in the correct format for JS use..
One or two comments in the second fiddle might be incorrect as modified version of the first fiddle.. the CSV comment is at least
Test XLS File: http://www.whitehouse.gov/sites/default/files/omb/budget/fy2014/assets/receipts.xls
This does not cover XLSX files thought, it should be fairly easy to adjust for them using their examples.
js-xlsx library makes it easy to convert Excel/CSV files into JSON objects.
Download the xlsx.full.min.js file from here.
Write below code on your HTML page
Edit the referenced js file link (xlsx.full.min.js) and link of Excel file
<!doctype html>
<html>
<head>
<title>Excel to JSON Demo</title>
<script src="xlsx.full.min.js"></script>
</head>
<body>
<script>
/* set up XMLHttpRequest */
var url = "http://myclassbook.org/wp-content/uploads/2017/12/Test.xlsx";
var oReq = new XMLHttpRequest();
oReq.open("GET", url, true);
oReq.responseType = "arraybuffer";
oReq.onload = function(e) {
var arraybuffer = oReq.response;
/* convert data to binary string */
var data = new Uint8Array(arraybuffer);
var arr = new Array();
for (var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
var bstr = arr.join("");
/* Call XLSX */
var workbook = XLSX.read(bstr, {
type: "binary"
});
/* DO SOMETHING WITH workbook HERE */
var first_sheet_name = workbook.SheetNames[0];
/* Get worksheet */
var worksheet = workbook.Sheets[first_sheet_name];
console.log(XLSX.utils.sheet_to_json(worksheet, {
raw: true
}));
}
oReq.send();
</script>
</body>
</html>
Input:
Output:
The answers are working fine with xls format but, in my case, it didn't work for xlsx format. Thus I added some code here. it works both xls and xlsx format.
I took the sample from the official sample link.
Hope it may help !
function fileReader(oEvent) {
var oFile = oEvent.target.files[0];
var sFilename = oFile.name;
var reader = new FileReader();
var result = {};
reader.onload = function (e) {
var data = e.target.result;
data = new Uint8Array(data);
var workbook = XLSX.read(data, {type: 'array'});
console.log(workbook);
var result = {};
workbook.SheetNames.forEach(function (sheetName) {
var roa = XLSX.utils.sheet_to_json(workbook.Sheets[sheetName], {header: 1});
if (roa.length) result[sheetName] = roa;
});
// see the result, caution: it works after reader event is done.
console.log(result);
};
reader.readAsArrayBuffer(oFile);
}
// Add your id of "File Input"
$('#fileUpload').change(function(ev) {
// Do something
fileReader(ev);
}
#Kwang-Chun Kang Thanks Kang a lot! I found the solution is working and very helpful, it really save my day.
For me I am trying to create a React.js component that convert *.xlsx to json object when user upload the excel file to a html input tag.
First I need to install XLSX package with:
npm install xlsx --save
Then in my component code, import with:
import XLSX from 'xlsx'
The component UI should look like this:
<input
accept=".xlsx"
type="file"
onChange={this.fileReader}
/>
It calls a function fileReader(), which is exactly same as the solution provided.
To learn more about fileReader API, I found this blog to be helpful:
https://blog.teamtreehouse.com/reading-files-using-the-html5-filereader-api
This is my expansion on https://stackoverflow.com/a/52237535/5079799
While it was working/great example, I'm not using an input form, but fetching from a URL and I have other things to do after fething workbook so I needed to wrap the onload into a promise.
See --> adjust onload function to be used with async/await
Here is what I ended up w/
async function Outside_Test(){
var reso = await Get_JSON()
console.log('reso_out')
console.log(reso)
}
async function Get_JSON() {
var url = "http://MyworkbookURL"
var workbook = await Get_XLSX_As_Workbook_From_URL(url)
/* DO SOMETHING WITH workbook HERE */
var first_sheet_name = workbook.SheetNames[0];
/* Get worksheet */
var worksheet = workbook.Sheets[first_sheet_name];
var reso = (XLSX.utils.sheet_to_json(worksheet, {
raw: true
}));
return reso
}
async function Get_XLSX_As_Workbook_From_URL(url) {
const arrayBuffer = await new Promise((resolve, reject) => {
var oReq = new XMLHttpRequest();
oReq.open("GET", url, true);
oReq.responseType = "arraybuffer";
oReq.onload = () => resolve(oReq.response);
oReq.onerror = reject;
oReq.send();
});
var data = new Uint8Array(arrayBuffer);
var arr = new Array();
for (var i = 0; i != data.length; ++i) arr[i] = String.fromCharCode(data[i]);
var bstr = arr.join("");
var workbook = XLSX.read(bstr, {
type: "binary"
});
return workbook
}