How to auto select *all* items in dependent jQuery multiselect dropdown lists? -

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my requirement when select customer combobox, need able auto-select items in dependent jquery multiselect dropdown lists. following started with. suggestion/help !

 mvc view:             <td>                 @if(viewbag.customer != null)                 {                   @(                      html.telerik().combobox()                      .name("ddlcustomer")                      .bindto((ienumerable<selectlistitem>)viewbag.customer)                      .clientevents(ce => ce.onchange("ddlcustomer_onchange"))                    )                 }             </td>              <td>                  @if (viewbag.service != null)                  {                    @html.dropdownlist("ddlservice", (ienumerable<selectlistitem>)viewbag.service, new { onchange = "servicechange()" })                  }             </td>              <td>                 @if (viewbag.type != null)                 {                   @html.dropdownlist("ddltype", (ienumerable<selectlistitem>)viewbag.type, new { onchange = "componentchange()" })                 }             </td>              <td>                 @if (viewbag.subtype != null)                 {                   @html.dropdownlist("ddlsubtype", (ienumerable<selectlistitem>)viewbag.subtype)                 }             </td>      //.js file      function ddlcustomer_onchange(){         var goldcustomer = "gold customer";         var ddlcustomercombo = $(this).data('tcombobox');         var selectedoption = ddlcustomercombo.text();          if (selectedoption == goldcustomer){             //i want items auto-selected in ddlservice               $("#ddlservice").multiselect("checkall");              //i want items auto-selected in ddltype             //which based on checked items in #ddlservice                 $("#ddltype").multiselect("checkall");             //i want items auto-selected in ddlsubtype             //which based on checked items in #ddltype             $("#ddlsubtype").multiselect("checkall");            }     };

above .multiselect("checkall") ddltype , ddlsubtype not working, though ddlservice working. suggestion appreciated. thanks!!


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