Declining Character Textbox

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@Html.TextAreaFor(model => model.agreement.purpose, new { maxlength = "500", id = "purpose", @class = "form-control", @rows = 5 })
<div style="font-size:11px; color:##999; font-weight:normal;"><span id="PurposeCounter">500</span> Characters remaining</div>


 <script language="javascript">
        function updatePurpose() {
            var maxLength = 500;
            summary = document.getElementById("purpose");
            if (summary.value.length > maxLength) {
                summary.value = summary.value.substring(0, maxLength);
            }
            else {
                $("#PurposeCounter").html(maxLength - $("#purpose").html().length);
            }
        };
        $("#purpose").keyup(function () {
            updatePurpose();
        });
        updatePurpose();
    </script>

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