Auto Resize Textarea When Typing – Auto-Resize.js

Welcome Folks I am back with another blog post. In this post we will be talking about how to auto resize the textarea widget in your application when you are typing inside it. We will auto resize the textarea with a free jQuery Plugin called AutoResize.js. This is a free library available in jQuery to do this task. The demo of the application is shown below. A video is shown. Just watch the demo and understand it. All the source code of the application is also given below.





Example Source Code


<!DOCTYPE html>
<html lang="en">
	<title>jQuery Auto Resize</title>
	<meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta name="description" content="Simple jQuery plugin to automically resize your <textarea>">
	<meta name="keywords" content="jquery,jQuery,plugin,jquery plugin,textarea,jquery auto resize,auto resize,auto resize plugin,auto resize textarea">
	<meta name="author" content="RifkyLTF">

	<link rel="stylesheet" type="text/css" href="demo/css/bootstrap.min.css">
	<link rel="stylesheet" type="text/css" href="demo/css/vs.css">

		.demo-title {
			font-size: 3.5rem;
			font-weight: 300;
			margin-bottom: 1.5rem;

		.svg {
			width: 1rem;
			height: auto

		@media (max-width: 767.98px) {
			.demo-title {
				font-size: 2.5rem

		@media (max-width: 424.98px) {
			.demo-title {
				font-size: 2rem

		@media (min-width: 768px) {
			.btn-download {
				padding: 0.5rem 1rem;
				font-size: 1.25rem;
				line-height: 1.5;
				border-radius: 0.3rem;

	<div class="jumbotron jumbotron-fluid text-center mb-0 pb-3">
	  <div class="container">
	    <h1 class="demo-title">Simple jQuery Plugin to Auto Resize Your <code><textarea></code></h1>
	    <hr class="my-3">
	    <a href="dist/jquery-auto-resize.js" class="btn btn-primary btn-download px-5" download>Download</a>
	    <label><a href="dist/jquery-auto-resize.min.js" class="text-primary" download>Minified version</a></label>
    	<hr class="my-3">
    	<section class="text-left text-dark">
    		<h3 class="text-center">Usage</h3>

    		<h5>Basic Usage</h5>
    		<pre><code class="javascript">$(document).ready(function() {

			<h5>Adding Value</h5>
			<pre><code class="javascript">// format
$("textarea").autoresize(minRow, maxRows)
// default value for minRow is 2 and maxRows is false
// you can empty the maxRows value to make your textarea have an infinity rows

// Example
$(document).ready(function() {
  $("textarea").autoresize(2, 5)

// Example with infinity rows
$(document).ready(function() {
	    <hr class="my-3">
	    <h3 class="text-dark mb-3">Playground</h3>
		<div class="row">
    		<div class="col-md-6">
    			<div class="form-row">
		    		<div class="form-group col-sm-6">
		    			<input type="text" id="minRows" class="form-control" placeholder="Min. row(s)">
		    		<div class="form-group col-sm-6">
		    			<input type="text" id="maxRows" class="form-control" placeholder="Max. rows">
				<div class="form-group">
					<button class="btn btn-primary btn-block">Set</button>
    		<div class="col-md-6">
    			<textarea class="form-control" placeholder="You can test this one"></textarea>
	    <hr class="my-3">
	    <img src="demo/svg/github.svg" class="svg mr-1"><a href="" target="_blank">Contribute</a> ||
	    Made with <img src="demo/svg/love.svg" class="svg"> by <a href="" target="_blank">RifkyLTF</a>

	<script src="demo/js/jquery-3.4.1.min.js"></script>
	<script src="demo/js/bootstrap.bundle.min.js"></script>
	<script src="demo/js/highlight.pack.js"></script>
	<script src="dist/jquery-auto-resize.min.js"></script>
		(function($) {
		  $.fn.inputFilter = function(inputFilter) {return this.on("input keydown keyup mousedown mouseup select contextmenu drop", function() { if (inputFilter(this.value)) {this.oldValue = this.value;this.oldSelectionStart = this.selectionStart;this.oldSelectionEnd = this.selectionEnd} else if (this.hasOwnProperty("oldValue")) {this.value = this.oldValue; this.setSelectionRange(this.oldSelectionStart, this.oldSelectionEnd)}})}

			$("input").inputFilter(function(value) { return /^\d*$/.test(value) })


				let min = +$('#minRows').val()
				let max = +$('#maxRows').val()
				if (validate(min, max)) { $('textarea').val('').autoresize(min, max) }

		function validate(min, max) {
			if (min > max) {
				alert('Max rows should not be less than min row(s)')
				return false
			} else {
				return true


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Download Source Code


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