Form AutoGrow

Automatically resizes textareas based on their content.

This Plugin is part of MooTools PowerTools!.

Build

Build via Packager, requires MooTools Core and MooTools Class-Extras to be registered to Packager already

packager register /path/to/form-autogrow
packager build Form-AutoGrow/* > form-autogrow.js

To build this plugin without external dependencies use

packager build Form-AutoGrow/* +use-only Form-AutoGrow > form-autogrow.js

Demo

See Demos/index.html

How To Use

Create a new instance of Form.AutoGrow for your TextArea-Element

new Form.AutoGrow('myTextarea');

Options

minHeightFactor (number, defaults to 2): The minimum textarea height based on the font-size
margin (number, defaults to 0): A margin to be added (subtracted) to the calculated textarea height

CSS Tips

Use the following CSS-Styles to get most out of Form.AutoGrow.

Hide the vertical scrollbar that sometimes appears in Webkit while resizing

textarea {
	overflow-y: hidden;
}

Hide the resize handle in Webkit

textarea {
	resize: none;
}

Animate the height via CSS-Transforms

textarea {
	-moz-transition-duration: 250ms;
	-webkit-transition-duration: 250ms;
	-o-transition-duration: 250ms;
	transition-duration: 250ms;
	-webkit-transition-property: height;
	-moz-transition-property: height;
	-o-transition-property: height;
	transition-property: height;
}