Answers for "select2 multi select remove all selected jquery"

jquery clear select 2

$('select2element').val(null).trigger("change")

jquery select2 multiple select all

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