how select option using jquery to select2 code example

Example 1: jquery select2 multiple select all

$("#checkbox").click(function(){
    if($("#checkbox").is(':checked') ){
        $("select > option").prop("selected","selected");
    }else{
        $("select > option").removeAttr("selected");
     }
});

Example 2: jquery select2

//Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.