Auto expand a textarea using jQuery

Question

How can I make a textarea automatically expand using jQuery   I have a textbox for explaining the agenda of the meeting  so I want to expand that textbox when my agenda s text keep growing that textbox area

User · Answer

The simplest solution   html    lt textarea class  auto-expand  gt  lt  textarea gt    css    auto-expand       overflow hidden      min-height  80px      js  jquery      document  ready function          textarea auto-expand   focus function              var  minHeight     this  css  min-height              this  on  input   function  e                  this  css  height    minHeight               var  newHeight     this  0  scrollHeight                this  css  height    newHeight

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Solution with pure JS  function autoSize       if  element        element setAttribute  rows   2     minimum rows     const rowsRequired   parseInt         element scrollHeight - TEXTAREA CONFIG PADDING    TEXTAREA CONFIG LINE HEIGHT           if  rowsRequired     parseInt element getAttribute  rows             element setAttribute  rows   rowsRequired                https   jsfiddle net Samb102 cjqa2kf4 54

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Try this        textarea name  mytextarea     on  input   function          this  height  auto   height   this  prop  scrollHeight      px         trigger  input

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this worked for me perfectly well       textarea   on  keyup input   function                  this  css  height    auto   css  height   this scrollHeight           this offsetHeight - this clientHeight

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Everyone should try this jQuery plugin  xautoresize-jquery  It s really good and should solve your problem

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There is also the very cool bgrins ExpandingTextareas  github  project  based on a publication by Neill Jenkins called Expanding Text Areas Made Elegant

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Georgiy Ivankin made a suggestion in a comment  I used it successfully    --   but with slight changes       note   on  keyup  function e       var maxHeight   200       var f   document getElementById  note         if  f clientHeight  lt  f scrollHeight  amp  amp  f scrollHeight  lt  maxHeight              f style height   f scrollHeight    px                     It stops expanding after it reaches max height of 200px

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Grows   Shrinks textarea  This demo utilizes jQuery for event binding  but it s not a must in any way   no IE support - IE doesn t respond to rows attribute change   DEMO PAGE    HTML   lt textarea class  autoExpand  rows  3  data-min-rows  3  placeholder  Auto-Expanding Textarea  gt  lt  textarea gt    CSS  textarea      display block    box-sizing  padding-box    overflow hidden     padding 10px    width 250px    font-size 14px    margin 50px auto    border-radius 8px    border 6px solid  556677      javascript  updated     document       one  focus textarea     autoExpand   function            var savedValue   this value          this value               this baseScrollHeight   this scrollHeight          this value   savedValue              on  input textarea     autoExpand   function            var minRows   this getAttribute  data-min-rows   0              rows          this rows   minRows          rows   Math ceil  this scrollHeight - this baseScrollHeight    16           this rows   minRows   rows

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People seem to have very over worked solutions     This is how I do it        textarea   keyup function           var       this      this       height   parseInt  this css  line-height        10       padTop   parseInt  this css  padding-top        10       padBot   parseInt  this css  padding-bottom     10         this height 0        var      scroll    this prop  scrollHeight        lines     scroll  - padTop - padBot    height        this height height   lines           This will work with long lines  as well as line breaks   grows and shrinks

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For anyone using the plugin posted by Reigel please be aware that this will disable the undo functionality in Internet Explorer  go give the demo a go    If this is a problem for you then I would suggest using the plugin posted by  richsage instead  as it does not suffer from this problem  See the second bullet point on Searching for the Ultimate Resizing Textarea for more information

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Simple jQuery solution      textarea   keyup function         var scrollHeight     this  prop  scrollHeight   - parseInt   this  css  paddingTop    - parseInt   this  css  paddingBottom          if  scrollHeight  gt    this  height                this  height scrollHeight    px                HTML    lt textarea rows  2  style  padding  20px  overflow  hidden  resize  none   gt  lt  textarea gt    Overflow should be hidden  Resize is none if you do not want to make it resizable by mouse

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x000D   x000D  function autoResizeTextarea     x000D    for  let index   0  index  lt     textarea   length  index      x000D      let element      textarea   index   x000D      let offset   element offsetHeight - element clientHeight  x000D        element  css  resize    none    x000D        element  on  input   function     x000D          this  height 0  height this scrollHeight - offset - parseInt   this  css  padding-top      x000D          x000D      x000D    x000D   x000D   x000D    https   codepen io nanachi1 pen rNNKrzQ  this should work

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This is the solution I ended up using  I wanted an inline solution  and this so far seems to work great    lt textarea onkeyup    this  css  height    auto   css  height   this scrollHeight   this offsetHeight - this clientHeight    gt  lt  textarea gt

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Code of SpYk3HH with addition for shrinking size   function get height elt        return elt scrollHeight   parseFloat   elt  css  borderTopWidth      parseFloat   elt  css  borderBottomWidth           textarea   keyup function e        var found   0      while   found              this  height   this  height   - 10           while   this  outerHeight    lt  get height this                   this  height   this  height     1               found   1

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To define a auto expandable textarea  you have to do two things    Expand it once you click Enter key inside it  or type content more than one line  And shrink it at blur to get the actual size if user has entered white spaces  bonus    Here is a handmade function to accomplish the task   Working fine with almost all browser    lt  IE7    Here is the method         Here is an event to get TextArea expand when you press Enter Key in it         intiate a keypress event        textarea   keypress function  e             if e which    13                var control   e target                              var controlHeight     control  height                      add some height to existing height of control  I chose 17 as my line-height was 17 for the control           control  height controlHeight 17                        textarea   blur function  e                 var textLines     this  val   trim   split   r  n   length              this  val   this  val   trim    height textLines 17             HERE is a post about this

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I wanted animations and auto-shrink  The combination is apparently hard  because people came up with pretty intense solutions for it  I ve made it multi-textarea-proof  too  And it isn t as ridiculously heavy as the jQuery plugin   I ve based myself on vsync s answer  and the improvement he made for it   http   codepen io anon pen vlIwj is the codepen for my improvement   HTML   lt textarea class  autoExpand  rows  3  data-min-rows  3  placeholder  Auto-Expanding Textarea  gt  lt  textarea gt    CSS  body  background  728EB2     textarea      display block    box-sizing  padding-box    overflow hidden     padding 10px    width 250px    font-size 14px    margin 50px auto    border-radius 8px    border 6px solid  556677    transition all 1s    -webkit-transition all 1s      JS  var rowheight   0     document  on  input textarea     autoExpand   function        var minRows   this getAttribute  data-min-rows   0          rows      this value split   n   length       this     this       var rowz   rows  lt  minRows   minRows   rows      var rowheight    this attr  data-rowheight        if  rowheight         this rows   rowz         this attr  data-rowheight    this clientHeight  - parseInt  this css  padding-top    - parseInt  this css  padding-bottom      rowz        else        rowz          this style cssText    height     rowz   rowheight    px

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I just built this function to expand textareas on pageload   Just change each to keyup and it will occur when the textarea is typed in      On page-load  auto-expand textareas to be tall enough to contain initial content    textarea   each function        var pad   parseInt   this  css  padding-top         if    browser mozilla             this  height 1       var contentHeight   this scrollHeight      if     browser mozilla           contentHeight -  pad   2      if  contentHeight  gt    this  height               this  height contentHeight         Tested in Chrome  IE9 and Firefox   Unfortunately Firefox has this bug which returns the incorrect value for scrollHeight  so the above code contains a  hacky  workaround for it

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If you dont want a plugin there is a very simple solution     textarea   keyup function e        while   this  outerHeight    lt  this scrollHeight   parseFloat   this  css  borderTopWidth      parseFloat   this  css  borderBottomWidth                 this  height   this  height   1                See it working in a jsFiddle I used to answer another textarea question here   To answer the question of doing it in reverse or making it smaller as text is removed  jsFiddle     And if you do want a plugin    Jason has designed one here

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Auto Growing Textareas jQuery Autosize

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I have tried lots and this one is great  Link is dead  Newer version is available here  See below for old version  You can try by pressing and hold enter key in textarea  Compare the effect with the other auto expanding textarea plugin      edit based on comment    function            txtMeetingAgenda   autogrow          note  you should include the needed js files     To prevent the scrollbar in the textarea from flashing on  amp  off during expansion contraction  you can set the overflow to hidden as well       textMeetingAgenda   css  overflow    hidden   autogrow         Update   The link above is broken  But you can still get the javascript files here

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You can set the textarea s height to its scrollHeight on all events that change its potential size  function setTextareaResponsive id       adjustTextAreaHeight id         window  on  quot resize quot   function           adjustTextareaHeight id                 quot   quot    id  on  quot change input quot   function           adjustTextareaHeight id             function adjustTextareaHeight id          set height to 1  so scrollHeight is related to linecount  not original textarea size       quot   quot    id  height 1         quot   quot    id  height document getElementById id  scrollHeight      I personally like it better  when the height is not padded by the extra height  usually 12px  that scrollHeight provides  That s why I like to set the height to the number of lines multiplied by the lineHeight  in which case the function adjustTextareaHeight would look like this  function adjustTextareaHeight id       var textarea   document getElementById id          set height to 1  so scrollHeight is related to linecount  not original textarea size       quot   quot    id  height 1      var lineHeight   parseInt getComputedStyle textarea  lineHeight     var numberOfLines   Math floor textarea scrollHeight   lineHeight        quot   quot    id  height lineHeight   numberOfLines

User · Answer

function autosize textarea          textarea  height 1      temporarily shrink textarea so that scrollHeight returns content height when content does not fill textarea       textarea  height   textarea  prop  scrollHeight          document  ready function            document  on  input    textarea   function             autosize this                  textarea   each function              autosize this                  This will not work in Internet Explorer 9 or older as it makes use of the input event

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Old question but you could do something like this   html    lt textarea class  text-area  rows  1  gt  lt  textarea gt    jquery   var baseH     base scroll height     body        one  focus textarea     text-area   function e            baseH   this scrollHeight              on  input textarea     text-area   function e            if baseH  lt  this scrollHeight                  this  height 0  height this scrollHeight                     else                 this  height 0  height baseH                       This way the auto resize will apply to any textarea with the class  text-area   Also shrinks when text is removed   jsfiddle   https   jsfiddle net rotaercz 46rhcqyn

User · Answer

There are a lot of answers for this but I found something very simple  attach a keyup event to the textarea and check for enter key press the key code is 13   keyPressHandler e   if e keyCode    13    e target rows   e target rows   1       This will add another row to you textarea and you can style the width using CSS

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You can try this one   x000D   x000D      content   on  change keyup keydown paste cut    textarea   function      x000D            this  height 0  height this scrollHeight   x000D         find  textarea   change    x000D   lt script src  https   ajax googleapis com ajax libs jquery 1 11 1 jquery min js  gt  lt  script gt  x000D   lt div id  content  gt  x000D     lt textarea gt How about it lt  textarea gt  lt br   gt  x000D     lt textarea rows  5  gt 111111 x000D  222222 x000D  333333 x000D  444444 x000D  555555 x000D  666666 lt  textarea gt  x000D   lt  div gt  x000D   x000D   x000D

User · Answer

Simple Solution   HTML    lt textarea class  expand  gt  lt  textarea gt    JS      textarea expand   on  input   function         this  scrollTop   this  height            textarea expand   scroll function       var h     this  scrollTop      if  h  gt  0        this  height   this  height     h         https   fiddle jshell net 7wsnwbzg

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I fixed a few bugs in the answer provided by Reigel  the accepted answer     The order in which html entities are replaced now don t cause unexpected code in the shadow element   The original replaced     by   amp ampgt    causing wrong calculation of height in some rare cases   If the text ends with a newline  the shadow now gets an extra character      instead of having a fixed added height  as is the case in the original  Resizing the textarea after initialisation does update the width of the shadow  added word-wrap  break-word for shadow  so it breaks the same as a textarea  forcing breaks for very long words    There are some remaining issues concerning spaces  I don t see a solution for double spaces  they are displayed as single spaces in the shadow  html rendering   This cannot be soved by using  amp nbsp   because the spaces should break  Also  the textarea breaks a line after a space  if there is no room for that space it will break the line at an earlier point  Suggestions are welcome   Corrected code    function             fn autogrow   function  options            var  this  minHeight  lineHeight  shadow  update          this filter  textarea   each function                   this     this               minHeight    this height                lineHeight    this css  lineHeight                 this css  overflow   hidden                shadow       lt div gt  lt  div gt    css                   position   absolute                    word-wrap    break-word                   top  -10000                  left  -10000                  width   this width                    fontSize   this css  fontSize                    fontFamily   this css  fontFamily                    lineHeight   this css  lineHeight                    resize   none                 appendTo document body               update   function                      shadow css  width     this  width                     var val   this value replace   amp  g    amp amp                                         replace   lt  g    amp lt                                         replace   gt  g    amp gt                                         replace   n g    lt br  gt                                         replace   s g   amp nbsp                     if  val indexOf   lt br  gt    val length - 5      -1    val                           shadow html val                     this  css  height   Math max shadow height    minHeight                                this change update  keyup update  keydown update               update apply this                       return this           jQuery

User · Answer

This worked for me better    x000D   x000D      resiText   on  keyup input   function      x000D    this  css  height    auto   css  height   this scrollHeight    this offsetHeight - this clientHeight    x000D      x000D   resiText   x000D      box-sizing  border-box  x000D      resize  none  x000D    x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   lt textarea class  resiText  gt  lt  textarea gt  x000D   x000D   x000D

User · Answer

Let s say you re trying to accomplish this using Knockout    here s how   In page    lt textarea data-bind  event    keyup   root GrowTextArea    gt  lt  textarea gt    In view model   self GrowTextArea   function  data  event                event target id  height 0  height event target scrollHeight       This should work even if you have multiple textareas created by a Knockout foreach like I do

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I wrote this jquery function that seems to work   You need to specify min-height in css though  and unless you want to do some coding  it needs to be two digits long  ie 12px     fn expand ta   function      var val     this  val    val   val replace   lt  g    amp lt     val   val replace   gt  g    amp gt     val            var ta class     this  attr  class    var ta width     this  width     var min height     this  css  min-height   substr 0  2   min height   parseInt min height        pixel height   remove       body   append   lt pre class    ta class    id  pixel height  style  position  absolute  white-space  pre-wrap  visibility  hidden  word-wrap  break-word  width    ta width  px  height  auto   gt  lt  pre gt         pixel height   html val    var height       pixel height   height    if  val substr -6       lt br   gt         height   height   min height     if  height  gt   min height    this  css  height   height  px    else   this  css  height   min height  px

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I ve used the Textarea Expander jQuery plugin before with good results

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Thanks to SpYk3HH  I started with his solution and turned it into this solution  which adds the shrinking functionality and is even simpler and faster  I presume      textarea   keyup function e          this  height 30         this  height this scrollHeight   parseFloat   this  css  borderTopWidth      parseFloat   this  css  borderBottomWidth            Tested in current Chrome  Firefox and Android 2 3 3 browser   You may see flashes of the scroll bars in some browsers  Add this CSS to solve that   textarea  overflow hidden

[jquery] Auto expand a textarea using jQuery

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