Is there a way to dynamically resize a textarea using prototype?

Currently, I am developing a new internal sales application for the company where I am employed. One of the features is a form that enables users to update their delivery address.

I believe it would greatly enhance the user experience if the textarea used for entering the main address details dynamically resized based on the text input.

Any suggestions or solutions? Thank you!

Edit by XeeMez: Recently made some modifications to the code as it was not functioning correctly. Changed it to trigger on keyup event to account for each character typed.

resizeIt = function( ) {
  var str = $( 'iso_address' ).value;
  var cols = $( 'iso_address' ).cols;
  var linecount = 0;
  $A( str.split( "\n" ) ).each( function( l ) {
    linecount += 1 + Math.floor( l.length / cols ); // consider long lines
  } )
  $( 'iso_address' ).rows = linecount;
};

Answer №1

Learn how to autosize a textarea with this helpful technique.

Utilizes pixel height instead of line height for more accurate handling of line wrap when using a proportional font.
Can accept either an ID or element as input.
Optional max height parameter available, useful for limiting the size of the text area.
Successfully tested on Firefox 3 and IE6.

Code: (plain vanilla Javascript)

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

   /* Adjusts height in case rows are deleted, pixel value may need adjustment */
   if (text.clientHeight == text.scrollHeight) {
      text.style.height = "30px";
   }       

   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";
   }
}

Demo: (uses jQuery, targets the textarea that is currently being typed into - paste both samples into console if using Firebug on this page)

$("#post-text").keyup(function() 
{
  FitToContent(this, document.documentElement.clientHeight)
});

Answer №2

My approach involves implementing the expandTextArea function and calling it on keyup or keypress events.

var initialRows = 5;
function expandTextArea(event) {
    var targetElement = event.target;
    targetElement.rows = initialRows;
    while (targetElement.clientHeight < targetElement.scrollHeight) {
        targetElement.rows += 1;
    }
};

In addition, apply a CSS rule to prevent scrollbar display for a smoother experience:

textarea.no-scrollbar {
    overflow: hidden;
}

This method also allows the textarea to "shrink" back to the specified minimum size by removing

targetElement.rows = initialRows;
.

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