ANGULAR 5 : how to export data to csv file
My solution currently is making a service for the saving (I got this from Changhui Xu @ codeburst). No package installs needed for this...
import { Injectable } from '@angular/core';
declare global {
interface Navigator {
msSaveBlob?: (blob: any, defaultName?: string) => boolean
}
}
@Injectable({
providedIn: 'root',
})
export class CsvDataService {
exportToCsv(filename: string, rows: object[]) {
if (!rows || !rows.length) {
return;
}
const separator = ',';
const keys = Object.keys(rows[0]);
const csvContent =
keys.join(separator) +
'\n' +
rows.map(row => {
return keys.map(k => {
let cell = row[k] === null || row[k] === undefined ? '' : row[k];
cell = cell instanceof Date
? cell.toLocaleString()
: cell.toString().replace(/"/g, '""');
if (cell.search(/("|,|\n)/g) >= 0) {
cell = `"${cell}"`;
}
return cell;
}).join(separator);
}).join('\n');
const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
if (navigator.msSaveBlob) { // IE 10+
navigator.msSaveBlob(blob, filename);
} else {
const link = document.createElement('a');
if (link.download !== undefined) {
// Browsers that support HTML5 download attribute
const url = URL.createObjectURL(blob);
link.setAttribute('href', url);
link.setAttribute('download', filename);
link.style.visibility = 'hidden';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
}
}
}
And then I inject this service in my component. It then calls this service:
constructor(private csvService :CsvDataService) {}
saveAsCSV() {
if(this.reportLines.filteredData.length > 0){
const items: CsvData[] = [];
this.reportLines.filteredData.forEach(line => {
let reportDate = new Date(report.date);
let csvLine: CsvData = {
date: `${reportDate.getDate()}/${reportDate.getMonth()+1}/${reportDate.getFullYear()}`,
laborerName: line.laborerName,
machineNumber: line.machineNumber,
machineName: line.machineName,
workingHours: line.hours,
description: line.description
}
items.push(csvLine);
});
this.csvService.exportToCsv('myCsvDocumentName.csv', items);
}
}
Update: Here is slightly better way to do it:
- Open up command prompt in the directory of your project.
- Install file-saver by typing
npm install --save file-saver
import { saveAs } from 'file-saver';
into your .ts file.- Here is the updated code based on the new import.
downloadFile(data: any) {
const replacer = (key, value) => value === null ? '' : value; // specify how you want to handle null values here
const header = Object.keys(data[0]);
let csv = data.map(row => header.map(fieldName => JSON.stringify(row[fieldName], replacer)).join(','));
csv.unshift(header.join(','));
let csvArray = csv.join('\r\n');
var blob = new Blob([csvArray], {type: 'text/csv' })
saveAs(blob, "myFile.csv");
}
Credits to this answer for converting an object to CSV.
Here is the method to use:
downloadFile(data: any) {
const replacer = (key, value) => (value === null ? '' : value); // specify how you want to handle null values here
const header = Object.keys(data[0]);
const csv = data.map((row) =>
header
.map((fieldName) => JSON.stringify(row[fieldName], replacer))
.join(',')
);
csv.unshift(header.join(','));
const csvArray = csv.join('\r\n');
const a = document.createElement('a');
const blob = new Blob([csvArray], { type: 'text/csv' });
const url = window.URL.createObjectURL(blob);
a.href = url;
a.download = 'myFile.csv';
a.click();
window.URL.revokeObjectURL(url);
a.remove();
}
I'll add on later if I found a better way to do it.