javascript read text file line by line

javascript read text file line by line: Using simple javascript, We want to open a simple text file, read it line by line example with demo.

JavaScript is a programming language that enables you to create interactive websites. You can use JavaScript to control the appearance and behavior of web pages. You can also use JavaScript to create small scripts that can be embedded in web pages to perform specific tasks.

When you run a JavaScript file, your web browser executes the code in that file. This means that you can write code that interacts with the web page and the user. You can also use JavaScript to create small scripts that can be embedded in web pages to perform specific tasks.

One of the most common uses for JavaScript is to read text files line by line. You can use the JavaScript function getLine() to get the line number of the current text file. You can then use the line number to access the text of the line that the line number corresponds to.

javascript read text file line by line

Here is an example that reads the text of a text file and prints the lines that contain the word “cat”:

Read File Line by Line in JavaScript

Example
Use Plain JavaScript to Read a Local File Line by Line in JavaScript

document.getElementById('myfl').onchange = function(){
var myfl = this.files[0];
var reader = new FileReader();
reader.onload = function(progressEvent){
console.log(this.result);
};
reader.readAsText(myfl);
};

How to read a local text file using JavaScript?

using FileReader.readAsText() method to read local .txt file.

 




 
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javascript read text file line by line
Reading all the data content of a file using the line-reader module is easy as it supports the eachLine() method.

Pure JavaScript:
document.getElementById('fl').onchange = function(){

var fl = this.files[0];

var reader = new FileReader();
reader.onload = function(progressEvent){
// Entire file
console.log(this.result);

// By allrows
var allrows = this.result.split('\n');
for(var row = 0; row < allrows.length; row++){
console.log(allrows[row]);
}
};
reader.readAsText(fl);
};



Using ES6 Example
handleFiles(input) {

const fl = input.target.files[0];
const reader = new FileReader();

reader.onload = (event) => {
const fl = event.target.result;
const allLines = fl.split(/\r\n|\n/);
// Reading line by line
allLines.forEach((line) => {
console.log(line);
});
};

reader.onerror = (event) => {
alert(event.target.error.name);
};

reader.readAsText(fl);
}

How to read a file line by line using node.js ?
Example

const fs = require('fs');
const readline = require('readline');

const fl = readline.createInterface({
input: fs.createReadStream('pakainfo_dco.txt'),
output: process.stdout,
terminal: false
});

fl.on('line', (line) => {
console.log(line);
});

node.js read text file line by line

get lines as list from file node js
const fs = require('fs');

fs.readFile('welcome.txt', function(err, data) {
if(err) throw err;

const websites = data.toString().replace(/\r\n/g,'\n').split('\n');

for(let w of websites) {
console.log(w);
}
});


This video learn you to read a file from the user’s file system using JavaScript Example.

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