Calculate textarea characters using jquery

/////////////////////// html

<asp:TextBox ID="txt_Remarks" runat="server" CssClass="form-control" TextMode="MultiLine"

 MaxLength="150" Height="50px" onkeyup="return txt_area_Charc(this, 'txtCCountChar', 150)"></asp:TextBox>

//plugin-

     <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

///////////// js

function txt_area_Charc(val, txtcid, mval) {

    var len = val.value.length;

    if (len >= mval) {

        val.value = val.value.substring(0, mval);

        if (len == mval && txtcid != "") {

            $('#' + txtcid).text((mval - (len)) + " Character Left");

        }

        return false;

    } else {

        if (txtcid != "") {

            $('#' + txtcid).text((mval - (len)) + " Character Left");

        }

    }

}

// result