jQuery Plugin - AutoGrow Textarea
This plugin allows a textarea field to grow vertically with its content. To achieve that, a div element is created with exactly the same styles as the textarea and it is placed after it, but hidden. This div is then used as a mirror of the textarea. This is, each time the user types something, the textarea content is passed to the mirror element and it is then used to calculate the textarea height.
Check the plugin page if you want to check how it works first.
$ npm i jquery-autogrow-textarea
$ yarn add jquery-autogrow-textarea
Include the CSS file on the head of your page by adding the following:
Include the minified JS file on body of your page by adding the folllowing:
Make sure the script is loaded after jQuery.
Initialize it as follows:
You can also initialize it with the following options:
id: the id attribute to add to the mirror element;
classes: the classes to add to the mirror element;
Note: If there is more than one element on the jQuery collection a index will be appended to the id attribute.
If your textarea styles change you can trigger the 'autogrow.resize' event to correct the mirror styles as follows: