LanguageDirection/index.html at master · kamshory/LanguageDirection · GitHub

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Check Direction</title>
</head>

<body>
<form name="edit" method="post" action="">
  <textarea name="text" cols="70" rows="10" id="text" placeholder="Type RTL text here. ie: Arabic"></textarea>
</form>
<script type="text/javascript">
function isRTL(s){
    var ltrChars    = 'A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02B8\u0300-\u0590\u0800-\u1FFF'+'\u2C00-\uFB1C\uFDFE-\uFE6F\uFEFD-\uFFFF',
        rtlChars    = '\u0591-\u07FF\uFB1D-\uFDFD\uFE70-\uFEFC';
	var ltrDirCheck = new RegExp('['+ltrChars+']');
	var rtlDirCheck = new RegExp('['+rtlChars+']');
	var ltr = ltrDirCheck.test(s);
	var rtl = rtlDirCheck.test(s);
	if(rtl && !ltr)
	return true;
	return false;
};
function changeStyle(e)
{
	var elm = e.target;
	var str = elm.value;
	if(isRTL(str))
	{
		elm.style.direction = 'rtl';
	}
	else
	{
		elm.style.direction = 'ltr';
	}
}
document.getElementById('text').addEventListener('change', function(e){
	changeStyle(e);
});
document.getElementById('text').addEventListener('keyup', function(e){
	changeStyle(e);
});
document.getElementById('text').addEventListener('keydown', function(e){
	changeStyle(e);
});
</script>
</body>
</html>