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test.html
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test.html
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<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http:https://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript" src="jquery.caret.js"></script>
<script type="text/javascript">
$(function() {
var element = $('#text');
var text = element.val();
element.caret(2);
var pos = element.caret();
element.val(text.substring(0, pos) + 'b' + text.substring(pos));
element = $('#editable');
text = element.html();
element.caret(1);
pos = element.caret();
element.html(text.substring(0, pos) + 'b' + text.substring(pos));
});
</script>
</head>
<body>
<textarea id="text">a
c</textarea>
<input type="text" id="pos">
<button onclick="$('#pos').val($('#text').caret())">read</button>
<button onclick="$('#text').caret($('#pos').val())">write</button>
<div id="editable" contenteditable="true">ac</div>
</body>
</html>