Display text file with html

How to Read Text Files and Display in HTML Using JavaScript: Complete Guide with Examples

Learn how to read text files using JavaScript and display them in HTML. Explore different techniques and examples to find the best approach for your needs.

• Using the File API to read a text file in JavaScript
• Defining a file input tag and an output tag in HTML
• How to Read Text File in Javascript Line By Line
• Using pre or textarea tag to display the text with new lines in HTML
• Using FileReader.readAsArrayBuffer() to read the contents of a specified input file
• Using the readFile() function of the File System module in JavaScript to read a file
• Using the FileReader API to read a locally placed text file
• Using the showFile() function to read the content of an uploaded text file
• Using document.getElementById() to access an HTML element in JavaScript
• Other helpful code examples for reading and displaying text files in HTML using JavaScript
• Conclusion
• How to use JavaScript in HTML to read text file and display it?
• How do I view a text file in HTML?
• How to read data from HTML file in JavaScript?
• How to read and write a text file in JavaScript?

As the world becomes increasingly digital, the need to read and display text files in HTML using JavaScript continues to grow. Whether you’re working on a personal project or developing a web application, this guide will provide you with a complete understanding of how to read text files and display them in HTML using JavaScript.

Using the File API to read a text file in JavaScript

The File API is a powerful feature in JavaScript that allows you to access and manipulate files on a user’s device. To read a text file using the File API, you can use the FileReader object. Here’s an example code to demonstrate how to use the FileReader object to read a text file using the readAsText() method:

const fileInput = document.querySelector('input[type="file"]'); const reader = new FileReader();fileInput.addEventListener('change', (event) =>  const file = event.target.files[0]; reader.readAsText(file); reader.onload = () =>  const content = reader.result; console.log(content); >; >); 

In this example, we’re using an input tag of type file to allow the user to select a file. We then create a new FileReader object and read the file using the readAsText() method. Once the file has been read, we can access the content using the result property of the FileReader object.

Defining a file input tag and an output tag in HTML

Before we can read a text file in JavaScript, we need to define a file input tag and an output tag in HTML. Here’s an example code to demonstrate how to use the input tag to select a file and the output tag to display the content of the file:

input type="file" id="fileInput"> pre id="fileOutput">pre>script> const fileInput = document.querySelector('#fileInput'); const fileOutput = document.querySelector('#fileOutput'); fileInput.addEventListener('change', (event) =>  const file = event.target.files[0]; const reader = new FileReader(); reader.readAsText(file); reader.onload = () =>  const content = reader.result; fileOutput.innerText = content; >; >); script> 

In this example, we’re using an input tag of type file with an id of “fileInput” to allow the user to select a file. We then use a pre tag with an id of “fileOutput” to display the content of the file. When the user selects a file, we create a new FileReader object and read the file using the readAsText() method. Once the file has been read, we set the innerText property of the output tag to the content of the file.

How to Read Text File in Javascript Line By Line

In this video tutorial, you will learn how to read text file in javascript line by line. Duration: 4:55

Using pre or textarea tag to display the text with new lines in HTML

When displaying the content of a text file in HTML, it’s important to maintain the original formatting, including new lines. One way to do this is by using the pre or textarea tag in HTML. Here’s an example code to demonstrate how to use the pre or textarea tag to display the content of a text file with new lines:

input type="file" id="fileInput"> pre id="fileOutput">pre>script> const fileInput = document.querySelector('#fileInput'); const fileOutput = document.querySelector('#fileOutput'); fileInput.addEventListener('change', (event) =>  const file = event.target.files[0]; const reader = new FileReader(); reader.readAsText(file); reader.onload = () =>  const content = reader.result; fileOutput.innerText = content; >; >); script> 

In this example, we’re using a pre tag instead of a pre tag to maintain the original formatting of the text file. When the user selects a file, we create a new FileReader object and read the file using the readAsText() method. Once the file has been read, we set the innerText property of the pre tag to the content of the file.

Using FileReader.readAsArrayBuffer() to read the contents of a specified input file

In some cases, you may need to read the contents of a file as an array buffer instead of a string. To do this, you can use the FileReader.readAsArrayBuffer() method. Here’s an example code to demonstrate how to use the FileReader.readAsArrayBuffer() method to read the content of a text file:

const fileInput = document.querySelector('input[type="file"]'); const reader = new FileReader();fileInput.addEventListener('change', (event) =>  const file = event.target.files[0]; reader.readAsArrayBuffer(file); reader.onload = () =>  const arrayBuffer = reader.result; console.log(arrayBuffer); >; >); 

In this example, we’re using the same input tag as before to allow the user to select a file. We then create a new FileReader object and read the file using the readAsArrayBuffer() method. Once the file has been read, we can access the contents as an array buffer using the result property of the FileReader object.

Using the readFile() function of the File System module in JavaScript to read a file

In addition to the File API, JavaScript also provides a File System module that allows you to read and write files on a user’s device. To read a file using the File System module, you can use the readFile() function. Here’s an example code to demonstrate how to use the readFile() function to read the content of a text file:

const fs = require('fs');fs.readFile('/path/to/file.txt', (err, data) =>  if (err) throw err; console.log(data); >); 

In this example, we’re using the readFile() function of the File System module to read the contents of a text file located at “/path/to/file.txt”. Once the file has been read, we can access the contents using the data parameter of the callback function.

Using the FileReader API to read a locally placed text file

Another way to read a text file using JavaScript is by using the FileReader API to read a locally placed text file. Here’s an example code to demonstrate how to use the FileReader API to read the content of a text file:

const input = document.querySelector('input[type="file"]'); const reader = new FileReader();input.addEventListener('change', (event) =>  const file = event.target.files[0]; reader.readAsText(file); reader.onload = () =>  const content = reader.result; console.log(content); >; >); 

In this example, we’re using an input tag of type file to allow the user to select a file. We then create a new FileReader object and read the file using the readAsText() method. Once the file has been read, we can access the content using the result property of the FileReader object.

Using the showFile() function to read the content of an uploaded text file

If you’re working with a web application that allows users to upload files, you may need to read the content of the uploaded file. To do this, you can use the showFile() function in JavaScript. Here’s an example code to demonstrate how to use the showFile() function to read the content of a text file:

function showFile(file)  const reader = new FileReader(); reader.readAsText(file); reader.onload = () =>  const content = reader.result; console.log(content); >; >const input = document.querySelector('input[type="file"]');input.addEventListener('change', (event) =>  const file = event.target.files[0]; showFile(file); >); 

In this example, we define a showFile() function that takes a file as a parameter and uses the FileReader object to read the file. When the file has been read, we can access the content using the result property of the FileReader object. We then use an input tag of type file to allow the user to select a file and call the showFile() function with the selected file as a parameter.

Using document.getElementById() to access an HTML element in JavaScript

When working with JavaScript and HTML, it’s important to know how to access HTML elements using JavaScript. One way to do this is by using the document.getElementById() method. Here’s an example code to demonstrate how to use the document.getElementById() method to display the content of a text file in an HTML element:

input type="file" id="fileInput"> pre id="fileOutput">pre>script> const fileInput = document.querySelector('#fileInput'); const fileOutput = document.querySelector('#fileOutput'); fileInput.addEventListener('change', (event) =>  const file = event.target.files[0]; const reader = new FileReader(); reader.readAsText(file); reader.onload = () =>  const content = reader.result; fileOutput.innerText = content; >; >); script> 

In this example, we’re using the same input tag and pre tag as before to allow the user to select a file and display the content of the file. We then use the document.getElementById() method to access the input tag and pre tag and assign them to variables. When the user selects a file, we create a new FileReader object and read the file using the readAsText() method. Once the file has been read, we set the innerText property of the pre tag to the content of the file.

Other helpful code examples for reading and displaying text files in HTML using JavaScript

In html, js read text file code example

  document.getElementById('inputfile') .addEventListener('change', function() < var fr = new FileReader(); fr.onload = function() < document.getElementById('output') .textContent = fr.result; >fr.readAsText(this.files[0]); >) 

Conclusion

Reading and displaying text files in HTML using JavaScript is a critical aspect of web development. In this guide, we’ve covered several techniques for reading text files and displaying them in HTML using JavaScript. We’ve also provided helpful tips and best practices for reading and writing text files in JavaScript. By experimenting with these techniques and finding the best approach for your specific needs, you can create powerful and effective web applications that meet the demands of today’s digital world.

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Display text file in JavaScript

What code should I use to display the contents of a plain-text .txt file in JavaScript? I want the text to scroll on screen in the active window. Thanks in advance!

2 Answers 2

To get the text to display with new lines etc, use a or a , i.e.

Next is, where is the plain text file?

From a Server

function populatePre(url) < var xhr = new XMLHttpRequest(); xhr.onload = function () < document.getElementById('contents').textContent = this.responseText; >; xhr.open('GET', url); xhr.send(); > populatePre('path/to/file.txt'); 

From the local machine

Make the user select the file using an

Then when the user selects a file, use FileReader to populate the

document .getElementById('filechoice') .addEventListener( 'change', function () < var fr = new FileReader(); fr.onload = function () < document.getElementById('contents').textContent = this.result; >; fr.readAsText(this.files[0]); > ); 

We can use below code for this purpose:

I don’t think that’s what it was asked in the question. It was said “display the contents of a plain-text .txt file in JavaScript”.

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