Created
December 21, 2014 12:40
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Synchronized TextArea
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| <script> | |
| function sync() { | |
| var m = document.getElementById("main"); | |
| var s = document.getElementById("sub"); | |
| s.value = m.value; | |
| window.setTimeout( function() { | |
| s.focus(); | |
| s.selectionStart = m.selectionStart; | |
| s.selectionEnd = m.selectionEnd; | |
| s.scrollTop = m.scrollTop; | |
| m.focus(); | |
| }, 0); | |
| } | |
| </script> | |
| <textarea id="main" cols="" rows="" | |
| onInput="sync();" | |
| onKeyDown="sync();" | |
| ></textarea> | |
| <textarea id="sub" cols="" rows=""></textarea> |
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selectionStart とかでなく，桁/行で位置を拾えるようになると，またちょっと面白いことができそう．
安直には，改行コードで分割して数を数えればいいのかな？
http://oshiete.goo.ne.jp/qa/6845292.html
ブラウザ内での座標とかも計算できるから，これはこれで面白いことができそう．
http://d.akiroom.com/2012-06/jquery-textarea-caret-position-javascript-library/