add / remove option in other select box

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jQuery

Hi
I have two selectbox , and when i select option in one selextbox , i want to add option in other select box .

if i select 2 as value in one select box , i want to add 2 options to other select box..
and if i select 0 as value in one select box , i want to remove all options in other select box

pls give example in jquery


maulik shah


I have tried as

on first select box change function,

if value of first box is small then second select box selected value ,
i use

       var evalue = $("#childid :first-child").attr("value");
  $("#childid option[value='"+evalue+"']").prop('selected',true);


i hope u understood