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:
- 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; }
- 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>
- 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.
- 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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