ThinkkSo ThinkkSo - 1 year ago 70
CSS Question

Input field that gets taller as you type

I was wonder how I can create a text input that has an auto-adjustable height so that it gets taller to fit your text? For example, if I start typing a paragraph, it expands from a few lines to fit the paragraph.

Here's what I've currently got:

#commenttext {
width: 413px;
min-height: 22px;
max-height: 100%;
display: inline;
font-size: 11px;
color: #777777;
word-wrap: break-word;
font-family: "Open Sans", "Tahoma";
top: 7px;
position: relative;
left: 7px;
padding-left: 7px;

<form action="" method="POST">
<input type="text" id="commenttext">

But that's just a normal text area.

How can I make that text area get taller as I type more lines? Do I need Javascript?

Answer Source

Here's a CSS-only solution: Use a div with contenteditable set to true.

<div contenteditable="true"
    style="width:200px;min-height:20px;border:1px solid #ccc;"></div>

See this JSFiddle for an example.

EDIT: If you want to be able to submit this text, you'll need a little bit of javascript to put it into an input field. Add this to your form:

<form onsubmit="document.getElementById('hidden_data').value=document.getElementById('showing_data').innerHTML;">
    <input id="hidden_data" name="data" type="hidden"/>
    <div id="showing_data" contenteditable="true"
        style="width:200px;min-height:20px;border:1px solid #ccc;"></div>

This will put the contents of the div into a hidden input field so it will be submitted to the server through POST with anything else.

See this (updated) JSFiddle for an example.

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