TextArea Auto Height Based on Content jQuery / Javascript

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Inside this article we will see Auto height adjustment based on content in textarea using jquery and javascript. Tutorial will be very easy and interesting to understand.

This tutorial will gives the idea to create textarea auto height based on content jquery and javascript. Generally when we input into textarea of a specific height then after writing contents into it, it takes scrollbar into it instead of increasing height.

Textarea will increase it’s height on the basis content what we type into it. We will do in jquery and/or in javascript. Concept is very interesting to learn.

Learn More –

Let’s get started.


TextArea Auto Height Using jQuery

We will use jquery concept for auto height of textarea based on content.

Create an Application

Create a folder with name textarea-content. Create a file index.html into it.

Open index.html and write this complete code into it.

<!DOCTYPE html>
<html lang="en">

<head>
    <title>TextArea Auto Height Based on Content jQuery / Javascript</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>

<body>

    <div class="container">
        <h4>TextArea Auto Height Based on Content jQuery / Javascript</h4>
        <div class="panel panel-primary">
            <div class="panel-heading">TextArea Auto Height Based on Content jQuery / Javascript</div>
            <div class="panel-body">
                Write your Content
                <textarea id="txtbody" class="form-control" style="width: 400px;"></textarea>
            </div>
        </div>
    </div>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

    <script type="text/javascript">
        $(function() {

            $("#txtbody").on("input", function() {

                this.style.height = "auto";
                this.style.height = (this.scrollHeight) + "px";
                this.style.overflowY = "hidden";
            });
        });
    </script>
</body>

</html>

Logic Used

$("#txtbody").on("input", function() {

    this.style.height = "auto";
    this.style.height = (this.scrollHeight) + "px";
    this.style.overflowY = "hidden";
});

txtbody is id of textarea, when we input value in it. Dynamically height we are setting it to auto and also if any scroll then settings to hidden.


TextArea Auto Height Using Javascript

We will use javascript concept for auto height of textarea based on content.

Open index.html and write this complete code into it.

<!DOCTYPE html>
<html lang="en">

<head>
    <title>TextArea Auto Height Based on Content jQuery / Javascript</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>

<body>

    <div class="container">
        <h4>TextArea Auto Height Based on Content jQuery / Javascript</h4>
        <div class="panel panel-primary">
            <div class="panel-heading">TextArea Auto Height Based on Content jQuery / Javascript</div>
            <div class="panel-body">
                Write your Content
                <textarea id="txtbody" class="form-control" style="width: 400px;"></textarea>
            </div>
        </div>
    </div>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

    <script type="text/javascript">
        
        textarea = document.querySelector("#txtbody"); 
        
        textarea.addEventListener("input", autoResize, false); 
    
        function autoResize() { 
            this.style.height = "auto"; 
            this.style.height = this.scrollHeight + "px"; 
            this.style.overflowY = "hidden";
        }
    </script>
</body>

</html>

Logic Used

textarea = document.querySelector("#txtbody"); 
        
textarea.addEventListener("input", autoResize, false); 

function autoResize() { 
    this.style.height = "auto"; 
    this.style.height = this.scrollHeight + "px"; 
    this.style.overflowY = "hidden";
}

txtbody is id of textarea, when we input value in it. Dynamically height we are setting it to auto and also if any scroll then settings to hidden.


Application Testing

Open browser and type this –

URL – http://localhost/textarea-content/index.html

We hope this article helped you to learn TextArea Auto Height Based on Content jQuery / Javascript Tutorial in a very detailed way.

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