end0tknr https://blog.hatena.ne.jp/end0tknr/ end0tknr's kipple - web写経開発 https://end0tknr.hateblo.jp/ javascript function get_caret_pos( elm ) { if (elm.selectionStart != undefined){ return elm.selectionStart; } //for IE elm.focus(); var range = document.selection.createRange(); range.moveStart( "character", - elm.value.length ); return range.text.length; } <input type="text">はよいとして、<textarea>もカーソル位置を特定できるかな? 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fend0tknr.hateblo.jp%2Fentry%2F20100818%2F1282126968" title="テキストボックス( html )におけるカーソル(caret)位置を取得 - end0tknr&#39;s kipple - web写経開発" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2010-08-18 19:22:48 rich https://end0tknr.hateblo.jp/entry/20100818/1282126968 1.0 100%