/Javascript/jQuery/Using jquery to extend textarea

Using jquery to extend textarea

$(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;
    });

Source: stackoverflow.com

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