$(function() { var $textarea = $('#textarea'); var lineHeight = parseInt($textarea.css('lineHeight')); $textarea.on('input', function(e) { var lines = ($(this).val() + '\n').match(/\n/g).length; $(this).height(lineHeight * lines); }); });
![textareaを改行に応じて自動で高さが変わるようにする方法 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/24cea7a1c58cbf90391efc9ae69f97b643da3f94/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9dGV4dGFyZWElRTMlODIlOTIlRTYlOTQlQjklRTglQTElOEMlRTMlODElQUIlRTUlQkYlOUMlRTMlODElOTglRTMlODElQTYlRTglODclQUElRTUlOEIlOTUlRTMlODElQTclRTklQUIlOTglRTMlODElOTUlRTMlODElOEMlRTUlQTQlODklRTMlODIlOEYlRTMlODIlOEIlRTMlODIlODglRTMlODElODYlRTMlODElQUIlRTMlODElOTklRTMlODIlOEIlRTYlOTYlQjklRTYlQjMlOTUmdHh0LWFsaWduPWxlZnQlMkN0b3AmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT01NiZzPTdmZjRmODk1YWFhN2JkMGM5NmI2MzYwZGVkOTYxZmRh%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBhbXBlcnNhbmQmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPTkwZDc0YTYyODM1NGEwNjJmYmYzMWM0MmZjYTgzNzI2%26blend-x%3D142%26blend-y%3D436%26blend-mode%3Dnormal%26txt64%3DaW4g6YGL5Za26ICF44Ku44Or44OJ%26txt-width%3D770%26txt-clip%3Dend%252Cellipsis%26txt-color%3D%2523212121%26txt-font%3DHiragino%2520Sans%2520W6%26txt-size%3D36%26txt-x%3D156%26txt-y%3D536%26s%3Dc139fb5e888d3b75495609fc786b1639)
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