Passing Eval() as parameter in javascript

I have got a drop down list in a gridview and would like to pass eval() as parameter to javascript..

<asp:DropDownList ID="ddl_grprowcutter" runat="server"  onchange='<%# "fn_ddl(" +Eval("Order_No") + " );" %>'             AppendDataBoundItems="True" DataSourceID="sqlds_cutter" DataTextField="Name"              DataValueField="Emp_Id" BackColor="#A4BF54">

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