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How can you decrement a field count and retrieve the value when the form is posted?



  



<%
Session.CodePage=65001
Response.Charset="UTF-8"

textAreaMemoFieldRemainingLength=2000
if request.form("textAreaMemoField")<>"" then
   textAreaMemoField = request.form("textAreaMemoField")
   ' NOTE: YOU MUST FILTER ALL INPUT USED...this is just an example.
   ' filter textAreaMemoField for XSS or other evil input here.
   textAreaMemoFieldRemainingLength=2000-Len(textAreaMemoField)
end if 
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">

<head>
<title>field decrement</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="author" content="Roderick Divilbiss">
<meta name="copyright" content="© 2005 Roderick Divilbiss">
<script type="text/javascript">
function textCounter(pField, pRemainingLength, pMaxLength) {
    pRemainingLength.value = pMaxLength - pField.value.length;
}
</script>
</head>

<body>
<form action="fieldDecrement.asp" method="post">
  <p><textarea name="textAreaMemoField" cols="50" rows="4" onKeyDown="textCounter(this.form.textAreaMemoField,this.form.remainingLength,2000);" onKeyUp="textCounter(this.form.textAreaMemoField,this.form.remainingLength, 2000);" ><%=textAreaMemoField%></textarea>
  <input readonly type="text" name="remainingLength" size="1" maxlength="4" value="<%=textAreaMemoFieldLen%>">
  <input type="submit" value="Submit">
</form>
</body>

</html>