Automatically expand the input field as text is typed

Question

Automatically expand the input field as text is typed

In my HTML code, users can enter comments for a specific question. If the comments are lengthy, I want the text box to automatically increase in height. Here is my current HTML code:

<label class="label-reports">Comments</label>
 <input  @((ViewBag.UserId != null && ViewBag.UserId == question.AnsweredBy) || (question.AnsweredBy == null) ? "" : "disabled")  type="text" class="form-control" style="align-content:stretch; min-width:1200Px; width: auto !important" for="comments" value="@question.Comments" />

I attempted to use this code snippet:

<textarea class="form-control" rows="5"></textarea>*

However, my attempt was unsuccessful. Can anyone provide guidance on how to dynamically adjust the size of the text box based on the length of the input?

html css twitter-bootstrap

Answer 1

Answer №1

Enhancing <textarea> Elements...

If you're open to using a plugin, consider implementing something like autosize. This tool allows your <textarea> element to expand as needed :

<!-- Example autosize.js CDN Reference -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/autosize.js/3.0.15/autosize.min.js'></script>
<script>
    // Enable automatic resizing for all <textarea> elements while typing
    autosize(document.querySelectorAll('textarea'));
</script>

https://i.sstatic.net/dWSjS.gif

Interactive Demonstration

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Autosize Example</title>
</head>
<body>
  <pre>Start typing (and press Enter a few times)</pre>
  <textarea></textarea>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/autosize.js/3.0.15/autosize.min.js'></script>
  <script>
    autosize(document.querySelectorAll('textarea'));
  </script>
</body>
</html>

For <input> elements...

You don't have to neglect <input> elements. There's a handy plugin called autosize-input that essentially achieves the same functionality :

<!-- Example autosize.js CDN Reference -->
<script src="https://rawgit.com/yuanqing/autosize-input/master/autosize-input.min.js"></script>
<script>
    // Automatically adjust sizing for your specific <input> element
    autosizeInput(document.querySelector('#YourInputID'));
</script>

Answer 2

Enhancing <textarea> Elements...

If you're open to using a plugin, consider implementing something like autosize. This tool allows your <textarea> element to expand as needed :

<!-- Example autosize.js CDN Reference -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/autosize.js/3.0.15/autosize.min.js'></script>
<script>
    // Enable automatic resizing for all <textarea> elements while typing
    autosize(document.querySelectorAll('textarea'));
</script>

https://i.sstatic.net/dWSjS.gif

Interactive Demonstration

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Autosize Example</title>
</head>
<body>
  <pre>Start typing (and press Enter a few times)</pre>
  <textarea></textarea>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/autosize.js/3.0.15/autosize.min.js'></script>
  <script>
    autosize(document.querySelectorAll('textarea'));
  </script>
</body>
</html>

For <input> elements...

You don't have to neglect <input> elements. There's a handy plugin called autosize-input that essentially achieves the same functionality :

<!-- Example autosize.js CDN Reference -->
<script src="https://rawgit.com/yuanqing/autosize-input/master/autosize-input.min.js"></script>
<script>
    // Automatically adjust sizing for your specific <input> element
    autosizeInput(document.querySelector('#YourInputID'));
</script>

Automatically expand the input field as text is typed

Answer №1

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