javascript – Creating a textarea with auto-resize

The Question :

394 people think this question is useful

There was another thread about this, which I’ve tried. But there is one problem: the textarea doesn’t shrink if you delete the content. I can’t find any way to shrink it to the correct size – the clientHeight value comes back as the full size of the textarea, not its contents.

The code from that page is below:

function FitToContent(id, maxHeight)
{
   var text = id && id.style ? id : document.getElementById(id);
   if ( !text )
      return;

   var adjustedHeight = text.clientHeight;
   if ( !maxHeight || maxHeight > adjustedHeight )
   {
      adjustedHeight = Math.max(text.scrollHeight, adjustedHeight);
      if ( maxHeight )
         adjustedHeight = Math.min(maxHeight, adjustedHeight);
      if ( adjustedHeight > text.clientHeight )
         text.style.height = adjustedHeight + "px";
   }
}

window.onload = function() {
    document.getElementById("ta").onkeyup = function() {
      FitToContent( this, 500 )
    };
}

The Question Comments :

The Answer 1

249 people think this answer is useful

This works for me (Firefox 3.6/4.0 and Chrome 10/11):

var observe;
if (window.attachEvent) {
    observe = function (element, event, handler) {
        element.attachEvent('on'+event, handler);
    };
}
else {
    observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
}
function init () {
    var text = document.getElementById('text');
    function resize () {
        text.style.height = 'auto';
        text.style.height = text.scrollHeight+'px';
    }
    /* 0-timeout to get the already changed text */
    function delayedResize () {
        window.setTimeout(resize, 0);
    }
    observe(text, 'change',  resize);
    observe(text, 'cut',     delayedResize);
    observe(text, 'paste',   delayedResize);
    observe(text, 'drop',    delayedResize);
    observe(text, 'keydown', delayedResize);

    text.focus();
    text.select();
    resize();
}
textarea {
    border: 0 none white;
    overflow: hidden;
    padding: 0;
    outline: none;
    background-color: #D0D0D0;
}
<body onload="init();">
<textarea rows="1" style="height:1em;" id="text"></textarea>
</body>

If you want try it on jsfiddle It starts with a single line and grows only the exact amount necessary. It is ok for a single textarea, but I wanted to write something where I would have many many many such textareas (about as much as one would normally have lines in a large text document). In that case it is really slow. (In Firefox it’s insanely slow.) So I really would like an approach that uses pure CSS. This would be possible with contenteditable, but I want it to be plaintext-only.

The Answer 2

417 people think this answer is useful

A COMPLETE YET SIMPLE SOLUTION

Updated 2020-05-14 (Improved browser support for mobiles and tablets)

The following code will work:

  • On key input.
  • With pasted text (right click & ctrl+v).
  • With cut text (right click & ctrl+x).
  • With pre-loaded text.
  • With all textarea’s (multiline textbox’s) site wide.
  • With Firefox (v31-67 tested).
  • With Chrome (v37-74 tested).
  • With IE (v9-v11 tested).
  • With Edge (v14-v18 tested).
  • With IOS Safari.
  • With Android Browser.
  • With JavaScript strict mode.
  • Is w3c validated.
  • And is streamlined and efficient.

OPTION 1 (With jQuery)

This option requires jQuery and has been tested and is working with 1.7.23.3.1

Simple (Add this jquery code to your master script file and forget about it.)

$('textarea').each(function () {
  this.setAttribute('style', 'height:' + (this.scrollHeight) + 'px;overflow-y:hidden;');
}).on('input', function () {
  this.style.height = 'auto';
  this.style.height = (this.scrollHeight) + 'px';
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea placeholder="Type, paste, cut text here...">PRELOADED TEXT.
This javascript should now add better support for IOS browsers and Android browsers.</textarea>
<textarea placeholder="Type, paste, cut text here..."></textarea>

Test on jsfiddle


OPTION 2 (Pure JavaScript)

Simple (Add this JavaScript to your master script file and forget about it.)

const tx = document.getElementsByTagName('textarea');
for (let i = 0; i < tx.length; i++) {
  tx[i].setAttribute('style', 'height:' + (tx[i].scrollHeight) + 'px;overflow-y:hidden;');
  tx[i].addEventListener("input", OnInput, false);
}

function OnInput() {
  this.style.height = 'auto';
  this.style.height = (this.scrollHeight) + 'px';
}
<textarea placeholder="Type, paste, cut text here...">PRELOADED TEXT. This JavaScript should now add better support for IOS browsers and Android browsers.</textarea>
<textarea placeholder="Type, paste, cut text here..."></textarea>

Test on jsfiddle


OPTION 3 (jQuery Extension)

Useful if you want to apply further chaining to the textareas you want to be auto-sized.

jQuery.fn.extend({
  autoHeight: function () {
    function autoHeight_(element) {
      return jQuery(element)
        .css({ 'height': 'auto', 'overflow-y': 'hidden' })
        .height(element.scrollHeight);
    }
    return this.each(function() {
      autoHeight_(this).on('input', function() {
        autoHeight_(this);
      });
    });
  }
});

Invoke with $('textarea').autoHeight()


UPDATING TEXTAREA VIA JAVASCRIPT

When injecting content into a textarea via JavaScript append the following code to invoke the function in option 1.

$('textarea').trigger('input');


PRESET TEXTAREA HEIGHT

To fix the initial height of the textarea you will need to add an additional condition:

const txHeight = 16;
const tx = document.getElementsByTagName("textarea");
for (let i = 0; i < tx.length; i++) {
  if (tx[i].value == '') {
    tx[i].setAttribute("style", "height:" + txHeight + "px;overflow-y:hidden;");
  } else {
    tx[i].setAttribute("style", "height:" + (tx[i].scrollHeight) + "px;overflow-y:hidden;");
  }
  tx[i].addEventListener("input", OnInput, false);
}

function OnInput(e) {
  this.style.height = "auto";
  this.style.height = (this.scrollHeight) + "px";
}
<textarea placeholder="Type, paste, cut text here...">PRELOADED TEXT. This JavaScript should now add better support for IOS browsers and Android browsers.</textarea>
<textarea placeholder="Type, paste, cut text here..."></textarea>

The Answer 3

64 people think this answer is useful

jQuery solution adjust the css to match your requirements

css…

div#container textarea {
    min-width: 270px;
    width: 270px;
    height: 22px;
    line-height: 24px;
    min-height: 22px;
    overflow-y: hidden; /* fixes scrollbar flash - kudos to @brettjonesdev */
    padding-top: 1.1em; /* fixes text jump on Enter keypress */
}

javascript…

// auto adjust the height of
$('#container').delegate( 'textarea', 'keydown', function (){
    $(this).height( 0 );
    $(this).height( this.scrollHeight );
});
$('#container').find( 'textarea' ).keydown();

OR alternative for jQuery 1.7+…

// auto adjust the height of
$('#container').on( 'keyup', 'textarea', function (){
    $(this).height( 0 );
    $(this).height( this.scrollHeight );
});
$('#container').find( 'textarea' ).keyup();

I’ve created a fiddle with the absolute minimum styling as a starting point for your experiments… http://jsfiddle.net/53eAy/951/

The Answer 4

28 people think this answer is useful
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Textarea autoresize</title>
    <style>
    textarea {
        overflow: hidden;
    }
    </style>
    <script>
    function resizeTextarea(ev) {
        this.style.height = '24px';
        this.style.height = this.scrollHeight + 12 + 'px';
    }

    var te = document.querySelector('textarea');
    te.addEventListener('input', resizeTextarea);
    </script>
</head>
<body>
    <textarea></textarea>
</body>
</html>

Tested in Firefox 14 and Chromium 18. The numbers 24 and 12 are arbitrary, test to see what suits you best.

You could do without the style and script tags, but it becomes a bit messy imho (this is old style HTML+JS and is not encouraged).

<textarea style="overflow: hidden" onkeyup="this.style.height='24px'; this.style.height = this.scrollHeight + 12 + 'px';"></textarea>

Edit: modernized code. Changed onkeyup attribute to addEventListener.
Edit: keydown works better than keyup
Edit: declare function before using
Edit: input works better than keydown (thnx @WASD42 & @MA-Maddin)

jsfiddle

The Answer 5

26 people think this answer is useful

The best solution (works and is short) for me is:

    $(document).on('input', 'textarea', function () {
        $(this).outerHeight(38).outerHeight(this.scrollHeight); // 38 or '1em' -min-height
    }); 

It works like a charm without any blinking with paste (with mouse also), cut, entering and it shrinks to the right size.

Please take a look at jsFiddle.

The Answer 6

16 people think this answer is useful

You’re using the higher value of the current clientHeight and the content scrollHeight. When you make the scrollHeight smaller by removing content, the calculated area can’t get smaller because the clientHeight, previously set by style.height, is holding it open. You could instead take a max() of scrollHeight and a minimum height value you have predefined or calculated from textarea.rows.

In general you probably shouldn’t really rely on scrollHeight on form controls. Apart from scrollHeight being traditionally less widely-supported than some of the other IE extensions, HTML/CSS says nothing about how form controls are implemented internally and you aren’t guaranteed scrollHeight will be anything meaningful. (Traditionally some browsers have used OS widgets for the task, making CSS and DOM interaction on their internals impossible.) At least sniff for scrollHeight/clientHeight’s existance before trying to enable the effect.

Another possible alternative approach to avoid the issue if it’s important that it work more widely might be to use a hidden div sized to the same width as the textarea, and set in the same font. On keyup, you copy the text from the textarea to a text node in hidden div (remembering to replace ‘\n’ with a line break, and escape ‘<‘/’&’ properly if you’re using innerHTML). Then simply measuring the div’s offsetHeight will give you the height you need.

The Answer 7

14 people think this answer is useful

If you don’t need to support IE8 you can use the input event:

var resizingTextareas = [].slice.call(document.querySelectorAll('textarea[autoresize]'));

resizingTextareas.forEach(function(textarea) {
  textarea.addEventListener('input', autoresize, false);
});

function autoresize() {
  this.style.height = 'auto';
  this.style.height = this.scrollHeight+'px';
  this.scrollTop = this.scrollHeight;
  window.scrollTo(window.scrollLeft,(this.scrollTop+this.scrollHeight));
}

Now you only need to add some CSS and you are done:

textarea[autoresize] {
  display: block;
  overflow: hidden;
  resize: none;
}

Usage:

<textarea autoresize>Type here and I’ll resize.</textarea>

You can read more about how it works on my blog post.

The Answer 8

11 people think this answer is useful

autosize

https://github.com/jackmoore/autosize

Just works, standalone, is popular (3.0k+ GitHub stars as of October 2018), available on cdnjs) and lightweight (~3.5k). Demo:

<textarea id="autosize" style="width:200px;">a
J   b
c</textarea>
<script src="https://cdnjs.cloudflare.com/ajax/libs/autosize.js/4.0.2/autosize.min.js"></script>
<script>autosize(document.querySelectorAll('#autosize'));</script>

BTW, if you are using the ACE editor, use maxLines: Infinity: Automatically adjust height to contents in Ace Cloud 9 editor

The Answer 9

9 people think this answer is useful

Found an one liner from here;

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

The Answer 10

6 people think this answer is useful

Has anyone considered contenteditable? No messing around with scrolling,a nd the only JS I like about it is if you plan on saving the data on blur… and apparently, it’s compatible on all of the popular browsers : http://caniuse.com/#feat=contenteditable

Just style it to look like a text box, and it autosizes… Make its min-height the preferred text height and have at it.

What’s cool about this approach is that you can save and tags on some of the browsers.

http://jsfiddle.net/gbutiri/v31o8xfo/

var _auto_value = '';
$(document).on('blur', '.autosave', function(e) {
  var $this = $(this);
  if ($this.text().trim() == '') {
    $this.html('');
  }

  // The text is here. Do whatever you want with it.
  $this.addClass('saving');

  if (_auto_value !== $this.html() || $this.hasClass('error')) {

    // below code is for example only.
    $.ajax({
      url: '/echo/json/?action=xyz_abc',
      data: 'data=' + $this.html(),
      type: 'post',
      datatype: 'json',
      success: function(d) {
        console.log(d);
        $this.removeClass('saving error').addClass('saved');
        var k = setTimeout(function() {
          $this.removeClass('saved error')
        }, 500);
      },
      error: function() {
        $this.removeClass('saving').addClass('error');
      }
    });
  } else {
    $this.removeClass('saving');
  }
}).on('focus mouseup', '.autosave', function() {
  var $this = $(this);
  if ($this.text().trim() == '') {
    $this.html('');
  }
  _auto_value = $this.html();
}).on('keyup', '.autosave', function(e) {
  var $this = $(this);
  if ($this.text().trim() == '') {
    $this.html('');
  }
});
body {
  background: #3A3E3F;
  font-family: Arial;
}

label {
  font-size: 11px;
  color: #ddd;
}

.autoheight {
  min-height: 16px;
  font-size: 16px;
  margin: 0;
  padding: 10px;
  font-family: Arial;
  line-height: 20px;
  box-sizing: border-box;
  -o-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  overflow: hidden;
  display: block;
  resize: none;
  border: 0;
  outline: none;
  min-width: 200px;
  background: #ddd;
  max-height: 400px;
  overflow: auto;
}

.autoheight:hover {
  background: #eee;
}

.autoheight:focus {
  background: #fff;
}

.autosave {
  -webkit-transition: all .2s;
  -moz-transition: all .2s;
  transition: all .2s;
  position: relative;
  float: none;
}

.autoheight * {
  margin: 0;
  padding: 0;
}

.autosave.saving {
  background: #ff9;
}

.autosave.saved {
  background: #9f9;
}

.autosave.error {
  background: #f99;
}

.autosave:hover {
  background: #eee;
}

.autosave:focus {
  background: #fff;
}

[contenteditable=true]:empty:before {
  content: attr(placeholder);
  color: #999;
  position: relative;
  top: 0px;
  /*
    For IE only, do this:
    position: absolute;
    top: 10px;
    */
  cursor: text;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<label>Your Name</label>
<div class="autoheight autosave contenteditable" contenteditable="true" placeholder="Your Name"></div>

The Answer 11

5 people think this answer is useful

There is a slightly different approach.

<div style="position: relative">
  <pre style="white-space: pre-wrap; word-wrap: break-word"></pre>
  <textarea style="position: absolute; top: 0; left: 0; width: 100%; height: 100%"></textarea>
</div>

The idea is to copy the text from textarea into the pre and let CSS make sure that they have the same size.

The benefit is that frameworks present simple tools to move text around without touching any events. Namely, in AngularJS you would add a ng-model="foo" ng-trim="false" to the textarea and ng-bind="foo + '\n'" to the pre. See a fiddle.

Just make sure that pre has the same font size as the textarea.

The Answer 12

4 people think this answer is useful

The following works for cutting, pasting, etc., regardless of whether those actions are from the mouse, a keyboard shortcut, selecting an option from a menu bar … several answers take a similar approach but they don’t account for box-sizing, which is why they incorrectly apply the style overflow: hidden.

I do the following, which also works well with max-height and rows for minimum and maximum height.

function adjust() {
  var style = this.currentStyle || window.getComputedStyle(this);
  var boxSizing = style.boxSizing === 'border-box'
      ? parseInt(style.borderBottomWidth, 10) +
        parseInt(style.borderTopWidth, 10)
      : 0;
  this.style.height = '';
  this.style.height = (this.scrollHeight + boxSizing) + 'px';
};

var textarea = document.getElementById("ta");
if ('onpropertychange' in textarea) { // IE
  textarea.onpropertychange = adjust;
} else if ('oninput' in textarea) {
  textarea.oninput = adjust;
}
setTimeout(adjust.bind(textarea));
textarea {
  resize: none;
  max-height: 150px;
  border: 1px solid #999;
  outline: none;
  font: 18px sans-serif;
  color: #333;
  width: 100%;
  padding: 8px 14px;
  box-sizing: border-box;
}
<textarea rows="3" id="ta">
Try adding several lines to this.
</textarea>

For absolute completeness, you should call the adjust function in a few more circumstances:

  1. Window resize events, if the width of the textarea changes with window resizing, or other events that change the width of the textarea
  2. When the textarea‘s display style attribute changes, e.g. when it goes from none (hidden) to block
  3. When the value of the textarea is changed programmatically

Note that using window.getComputedStyle or getting currentStyle can be somewhat computationally expensive, so you may want to cache the result instead.

Works for IE6, so I really hope that’s good enough support.

The Answer 13

4 people think this answer is useful

As a different approach, you can use a <span> which adjusts its size automatically. You will need make it editable by adding the contenteditable="true" property and you’re done:

div {
  width: 200px;
}

span {
  border: 1px solid #000;
  padding: 5px;
}
<div>
  <span contenteditable="true">This text can be edited by the user</span>
</div>

The only issue with this approach is that if you want to submit the value as part of the form, you’ll have to do so by yourself in JavaScript. Doing so is relatively easy. For example, you can add a hidden field and in the onsubmit event of the form assign the value of the span to the hidden field which will be then automatically submitted with the form.

The Answer 14

4 people think this answer is useful

I used the following code for multiple textareas. Working fine in Chrome 12, Firefox 5 and IE 9, even with delete, cut and paste actions performed in the textareas.

function attachAutoResizeEvents() {
  for (i = 1; i <= 4; i++) {
    var txtX = document.getElementById('txt' + i)
    var minH = txtX.style.height.substr(0, txtX.style.height.indexOf('px'))
    txtX.onchange = new Function("resize(this," + minH + ")")
    txtX.onkeyup = new Function("resize(this," + minH + ")")
    txtX.onchange(txtX, minH)
  }
}

function resize(txtX, minH) {
  txtX.style.height = 'auto' // required when delete, cut or paste is performed
  txtX.style.height = txtX.scrollHeight + 'px'
  if (txtX.scrollHeight <= minH)
    txtX.style.height = minH + 'px'
}
window.onload = attachAutoResizeEvents
textarea {
  border: 0 none;
  overflow: hidden;
  outline: none;
  background-color: #eee
}
<textarea style='height:100px;font-family:arial' id="txt1"></textarea>
<textarea style='height:125px;font-family:arial' id="txt2"></textarea>
<textarea style='height:150px;font-family:arial' id="txt3"></textarea>
<textarea style='height:175px;font-family:arial' id="txt4"></textarea>

The Answer 15

3 people think this answer is useful

A bit corrections. Works perfectly in Opera

  $('textarea').bind('keyup keypress', function() {
      $(this).height('');
      var brCount = this.value.split('\n').length;
      this.rows = brCount+1; //++ To remove twitching
      var areaH = this.scrollHeight,
          lineHeight = $(this).css('line-height').replace('px',''),
          calcRows = Math.floor(areaH/lineHeight);
      this.rows = calcRows;
  });

The Answer 16

3 people think this answer is useful

Here is an angularjs directive for panzi’s answer.

 module.directive('autoHeight', function() {
        return {
            restrict: 'A',
            link: function(scope, element, attrs) {
                element = element[0];
                var resize = function(){
                    element.style.height = 'auto';
                    element.style.height = (element.scrollHeight)+'px';
                };
                element.addEventListener('change', resize, false);
                element.addEventListener('cut',    resize, false);
                element.addEventListener('paste',  resize, false);
                element.addEventListener('drop',   resize, false);
                element.addEventListener('keydown',resize, false);

                setTimeout(resize, 100);
            }
        };
    });

HTML:

<textarea ng-model="foo" auto-height></textarea>

The Answer 17

2 people think this answer is useful

I know a short and correct way of implementing this with jquery.No extra hidden div needed and works in most browser

<script type="text/javascript">$(function(){
$("textarea").live("keyup keydown",function(){
var h=$(this);
h.height(60).height(h[0].scrollHeight);//where 60 is minimum height of textarea
});});

</script>

The Answer 18

2 people think this answer is useful

I Don’t know if anyone mention this way but in some cases it’s possible to resize the height with rows Attribute

textarea.setAttribute('rows',breaks);

Demo

The Answer 19

2 people think this answer is useful

You can use JQuery to expand the textarea while typing:

$(document).find('textarea').each(function () {
  var offset = this.offsetHeight - this.clientHeight;

  $(this).on('keyup input focus', function () {
    $(this).css('height', 'auto').css('height', this.scrollHeight + offset);
  });
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div>
<textarea name="note"></textarea>
<div>

The Answer 20

2 people think this answer is useful

Those who want to achieve the same in new versions of Angular.

Grab textArea elementRef.

@ViewChild('textArea', { read: ElementRef }) textArea: ElementRef;

public autoShrinkGrow() {
    textArea.style.overflow = 'hidden';
    textArea.style.height = '0px';
    textArea.style.height = textArea.scrollHeight + 'px';
}

<textarea (keyup)="autoGrow()" #textArea></textarea>

I am also adding another use case that may come handy some users reading the thread, when user want to increase the height of text-area to certain height and then have overflow:scroll on it, above method can be extended to achieve the mentioned use-case.

  public autoGrowShrinkToCertainHeight() {
    const textArea = this.textArea.nativeElement;
    if (textArea.scrollHeight > 77) {
      textArea.style.overflow = 'auto';
      return;
    }
    else {
      textArea.style.overflow = 'hidden';
      textArea.style.height = '0px';
      textArea.style.height = textArea.scrollHeight + 'px';
    }
  }

The Answer 21

1 people think this answer is useful

Some of the answers here don’t account for padding.

Assuming you have a maxHeight you don’t want to go over, this worked for me:

    // obviously requires jQuery

    // element is the textarea DOM node

    var $el = $(element);
    // inner height is height + padding
    // outerHeight includes border (and possibly margins too?)
    var padding = $el.innerHeight() - $el.height();
    var originalHeight = $el.height();

    // XXX: Don't leave this hardcoded
    var maxHeight = 300;

    var adjust = function() {
        // reset it to the original height so that scrollHeight makes sense
        $el.height(originalHeight);

        // this is the desired height (adjusted to content size)
        var height = element.scrollHeight - padding;

        // If you don't want a maxHeight, you can ignore this
        height = Math.min(height, maxHeight);

        // Set the height to the new adjusted height
        $el.height(height);
    }

    // The input event only works on modern browsers
    element.addEventListener('input', adjust);

The Answer 22

1 people think this answer is useful

An even simpler, cleaner approach is this:

// adjust height of textarea.auto-height
$(document).on( 'keyup', 'textarea.auto-height', function (e){
    $(this).css('height', 'auto' ); // you can have this here or declared in CSS instead
    $(this).height( this.scrollHeight );
}).keyup();

// and the CSS

textarea.auto-height {
    resize: vertical;
    max-height: 600px; /* set as you need it */
    height: auto;      /* can be set here of in JS */
    overflow-y: auto;
    word-wrap:break-word
}

All that is needed is to add the .auto-height class to any textarea you want to target.

Tested in FF, Chrome and Safari. Let me know if this doesn’t work for you, for any reason. But, this is the cleanest and simplest way I’ve found this to work. And it works great! 😀

The Answer 23

1 people think this answer is useful

This code works for pasting and select delete also.

onKeyPressTextMessage = function(){
			var textArea = event.currentTarget;
    	textArea.style.height = 'auto';
    	textArea.style.height = textArea.scrollHeight + 'px';
};
<textarea onkeyup="onKeyPressTextMessage(event)" name="welcomeContentTmpl" id="welcomeContent" onblur="onblurWelcomeTitle(event)" rows="2" cols="40" maxlength="320"></textarea>

Here is the JSFiddle

The Answer 24

1 people think this answer is useful

I recommend the javascript library from http://javierjulio.github.io/textarea-autosize.

Per comments, add example codeblock on plugin usage:

<textarea class="js-auto-size" rows="1"></textarea>

<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
<script src="jquery.textarea_autosize.min.js"></script>
<script>
$('textarea.js-auto-size').textareaAutoSize();
</script>

Minimum required CSS:

textarea {
  box-sizing: border-box;
  max-height: 160px; // optional but recommended
  min-height: 38px;
  overflow-x: hidden; // for Firefox (issue #5)
}

The Answer 25

1 people think this answer is useful

MakeTextAreaResisable that uses qQuery

function MakeTextAreaResisable(id) {
    var o = $(id);
    o.css("overflow-y", "hidden");

    function ResizeTextArea() {
        o.height('auto');
        o.height(o[0].scrollHeight);
    }

    o.on('change', function (e) {
        ResizeTextArea();
    });

    o.on('cut paste drop keydown', function (e) {
        window.setTimeout(ResizeTextArea, 0);
    });

    o.focus();
    o.select();
    ResizeTextArea();
}

The Answer 26

1 people think this answer is useful

None of the answers seem to work. But this one works for me: https://coderwall.com/p/imkqoq/resize-textarea-to-fit-content

$('#content').on( 'change keyup keydown paste cut', 'textarea', function (){
    $(this).height(0).height(this.scrollHeight);
}).find( 'textarea' ).change();

The Answer 27

1 people think this answer is useful

my implementation is very simple, count the number of lines in the input (and minimum 2 rows to show that it’s a textarea):

textarea.rows = Math.max(2, textarea.value.split("\n").length) // # oninput

full working example with stimulus: https://jsbin.com/kajosolini/1/edit?html,js,output

(and this works with the browser’s manual resize handle for instance)

The Answer 28

1 people think this answer is useful

Accepted answer is working fine. But that is lot of code for this simple functionality. The below code will do the trick.

   $(document).on("keypress", "textarea", function (e) {
    var height = $(this).css("height");
    var iScrollHeight = $(this).prop("scrollHeight");
    $(this).css('height',iScrollHeight);
    });

The Answer 29

0 people think this answer is useful

If scrollHeight could be trusted, then:

textarea.onkeyup=function() {
  this.style.height='';
  this.rows=this.value.split('\n').length;
  this.style.height=this.scrollHeight+'px';
}

The Answer 30

0 people think this answer is useful

Here is what I did while using MVC HTML Helper for TextArea. I had quite a few of textarea elements so had to distinguish them using Model Id.

 @Html.TextAreaFor(m => m.Text, 2, 1, new { id = "text" + Model.Id, onkeyup = "resizeTextBox(" + Model.Id + ");" })

and in script added this:

   function resizeTextBox(ID) {            
        var text = document.getElementById('text' + ID);
        text.style.height = 'auto';
        text.style.height = text.scrollHeight + 'px';            
    }

I have tested it on IE10 and Firefox23

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