asp.net mvc - have to enable and disable my dropdown list when "All Course" is checked. multiselect dropdown validation - 


function updatetextarea()  {         var allvals = [];            $('#coursedropdown :checked').each(function ()      {         if ($(this).val() == "all courses")         {               if($(this).attr('checked'))             {                 $("input[type=checkbox][name='course-dropdown-list']").attr('checked', true);                  allvals.push($(this).val());             }             else                 if($(this).val() != "all courses")               {                 $("input[type=checkbox][name='course-dropdown-list']").attr('checked', false);                $(this).val() == "";                 allvals.push($(this).val());                                                                        }          }                     else          {                      allvals.push($(this).val());         }                });            $('#course').val(allvals); }

when "all course" option checked have check remaining options in dropdown , vice versa , have update textarea accordingly.when check "all course" working fine , texarea updated "all course" if uncheck not working.

try this

$("#checkbox1").val("false"); function oncheckchange() { if ($("#checkbox1").is(':checked')) { $("#dropdown1").attr('disabled', 'disabled'); $("#checkbox1").val("true"); } else { $("#dropdown1").removeattr('disabled'); } } $("#checkbox1").click(oncheckchange).change(oncheckchange);

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