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Inside this article we will see the concept i.e Javascript How To Create Auto Resize Textarea Example Tutorial. Article contains the classified information about How To Create Auto Expand Textarea in Javascript.

If you have a form, you are writing contents into a textarea. What happens when you increase your content length into writing area. It creates a scrollbar inside textarea which will not be good for User Interface.

If suppose it starts auto expand for you for more contents. How amazing it is. If you are looking to create a textarea which will work like this so you are at the right place to learn.

Using Javascript we will do auto resize concept.

Let’s get started.

Application Programming

Let’s create a folder with name auto-resize in your localhost directory. In this project folder, create a file: index.html

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

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

<head>
    <title>Javascript Auto Resize Textarea Example Tutorial</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">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
</head>

<body>

    <div class="container">
        <h3>Javascript Auto Resize Textarea Example Tutorial</h3>
        <div class="panel panel-primary">
            <div class="panel-heading">
                Javascript Auto Resize Textarea Example Tutorial
            </div>
            <div class="panel-body">
                <form action="#">
                    <div class="form-group">
                        <label for="email">Write Your Content:</label>
                        <textarea name="body" id="body" class="form-control"></textarea>
                    </div>
                    <button type="submit" class="btn btn-primary">Submit</button>
                </form>
            </div>
        </div>
    </div>

    <script type="text/javascript">
        textarea = document.querySelector("#body");

        textarea.addEventListener('input', autoResize, false);

        function autoResize() {

            this.style.height = 'auto';

            this.style.height = this.scrollHeight + 'px';

        }
    </script>
</body>

</html>

Concept

Here, you can see this javascript code.

This code allows textarea to auto expand when content increases.

<script type="text/javascript">
    textarea = document.querySelector("#body");

    textarea.addEventListener('input', autoResize, false);

    function autoResize() {

        this.style.height = 'auto';

        this.style.height = this.scrollHeight + 'px';

    }
</script>

Application Testing

Open your browser.

Next,

Your project URL will be like this.

URL: http://localhost/auto-resize/index.html

When Add more contents to textarea, it resizes automatically.

We hope this article helped you to learn Javascript How To Create Auto Resize Textarea Example Tutorial in a very detailed way.

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