Can You Dynamically Adjust Textarea Height with Just CSS?

Dynamic Textarea Height with CSS

When creating a textarea for user input, it's often desirable to have it expand or shrink to accommodate the amount of content. While solutions involving JavaScript or PHP exist, is there a purely CSS-based method?

The Solution:

Yes, it is possible to use CSS to achieve dynamic textarea height. Here's how:

1. Set the initial height to auto: To allow the textarea to grow or shrink as needed, set its initial height to "auto":

textarea {
  height: auto;
}

2. Use the 'oninput' Event: To adjust the textarea's height dynamically, attach an 'oninput' event handler to it:

<textarea oninput='this.style.height = "";this.style.height = this.scrollHeight + "px"'></textarea>

3. Reset Height First: Before setting the height based on content, first reset it to an empty string. This ensures the textarea can shrink as well as expand.
4. Calculate True Height: Determine the true height of the textarea based on its scrolled content and add it as pixels to the 'height' property.

By implementing these steps, you can create a textarea that will automatically adjust its height to fit its content without resorting to JavaScript or PHP.

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