Question

I have five select boxes .all have an first option “–Select–” and i dont i want to have select boxes have the same option selected ,no duplicate options .how to do this using jquery

Answer 1

First give all the selects the same class and different id’s.
Then something like this.

var selects = $('.days');
$('.days').change(function(){
   var value = $(this).val();
   var count = 0;
   for(var i=0; i<selects.length; i++){
      if($(this).attr('id') != $(selects[i]).attr('id')) {
         var checkVal = $(selects[i]).val();
         if(value == checkVal) {
            alert("Value already selected, please select a different value");
            $("#"+$(this).attr('id')+" option[value='']").attr("selected", "selected");
         }
      }
   }

});

I’ve added a JSFiddle showing the solution.