SMS counter is JQuery utility that help count characters in SMS message
You only need jquery 1.x version or higher.
Sample code below:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>SMS Counter</title>
</head>
<body>
<textarea id="mymagicsms"></textarea>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript" src="SMSCounter.js"></script>
<script type="text/javascript">
$(function(){
$('#mymagicsms').on("change keyup paste", function(){
var data = SMSCounter.count($(this).val(), true);
var length = data["length"];
var remaining = data["remaining"];
var part_count = data["part_count"];
var text = data["text"];
var per_message = data["per_message"];
var encoding = data['encoding'];
var sms_type = "";
if (encoding == "GSM_7BIT") {
sms_type = "Normal";
}else if (encoding == "GSM_7BIT_EX") {
sms_type = "Extended"; // for 7 bit GSM: ^ { } \ [ ] ~ | €
} else if (encoding == "GSM_7BIT_EX_TR") {
sms_type = "Turkish"; // Only for Turkish Characters "Ş ş Ğ ğ ç ı İ" encoding see https://en.wikipedia.org/wiki/GSM_03.38#Turkish_language_.28Latin_script.29
} else if (encoding == "UTF16") {
sms_type = "Unicode"; // for other languages "Arabic, Chinese, Russian" see https://en.wikipedia.org/wiki/GSM_03.38#UCS-2_Encoding
}
console.log(length);
console.log(remaining);
console.log(part_count);
console.log(per_message);
console.log(encoding);
console.log(sms_type);
});
})
</script>
</body>
</html>