asp.net - Changing DataSourceId of a dropdown from JavaScript -


can change datasourceid of drop down depending on dropdown selection in javascript got 3 dropdown value on base of selection of dropdown want change datasource of sqldatasource

<script type="text/javascript">             function abc() {             if (document.getelementbyid('type').value == "c") {              }             else if (document.getelementbyid('type').value == "g") {              }            else if (document.getelementbyid('type').value == "s") {              }         }     </script>         <asp:dropdownlist id="type" runat="server" onblur ="abc();">             <asp:listitem>c</asp:listitem>             <asp:listitem>g</asp:listitem>             <asp:listitem>s</asp:listitem>         </asp:dropdownlist>         <asp:sqldatasource           id="c"           runat="server"           datasourcemode="datareader"           connectionstring="<%$connectionstrings:connstring%>"           selectcommand="select rtrim(customer) customer,cust_id a1_customer isactive=1 order customer">       </asp:sqldatasource>       <asp:sqldatasource           id="g"           runat="server"           datasourcemode="datareader"           connectionstring="<%$connectionstrings:connstring%>"           selectcommand="select rtrim(supplier) supplier,sup_id a1_supplier isactive=1  order supplier">       </asp:sqldatasource>         <asp:sqldatasource           id="s"           runat="server"           datasourcemode="datareader"           connectionstring="<%$connectionstrings:connstring%>"           selectcommand="select rtrim(title) title ,acno,ac_type a1_glcard isactive=1 , levels=4 order title">       </asp:sqldatasource>      </td>     <td>     <asp:dropdownlist id="htitle" runat="server" datasourceid="c" datatextfield="customer" datavaluefield="cust_id"  width="168px">


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