How to Implement Dynamic Textarea Height Adjustment without Scrollbars?

Textarea Auto Height Revisited

Question:

Many developers have encountered the need to adjust the height of a textarea dynamically to fit the content within it. This not only enhances the user experience but also eliminates unnecessary scrollbars.

Solution:

One approach to achieve this is through the use of Pure JavaScript. Here's a code snippet that effectively adjusts the height of a textarea:

<code class="javascript">function auto_grow(element) {
  element.style.height = "5px";
  element.style.height = (element.scrollHeight) + "px";
}</code>

In this code:

• element is the textarea you want to adjust.
• The initial height is set to a small value (5px) to allow for accurate calculation.
• The scrollHeight property returns the height of the textarea's content, including hidden overflow.
• Setting the height to the scroll height dynamically adjusts it to fit the content.

To implement this functionality in CSS and HTML:

<code class="css">textarea {
  resize: none;
  overflow: hidden;
  min-height: 50px;
  max-height: 100px;
}</code>

<code class="html"><textarea oninput="auto_grow(this)"></textarea></code>

• resize: none; prevents the textarea from being resized by the user.
• overflow: hidden; hides any excess content beyond the set height.
• min-height and max-height define the minimum and maximum height limits.
• The oninput event triggers the auto_grow function whenever the input in the textarea changes.

This solution ensures that the textarea's height matches the content it contains, providing an improved user experience with no scrollbars.

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