Common select2 examples

select2.js

// load data by another event (on parent change)

$("#parent").on("change", function (e) {
    $.ajax({
        url: '/api' + e.target.value,
        dataType: "json",
        success: function (data) {
            $("#child").select2({
                data: data,
                allowClear:true,
		width: "100%",
                disabled: !data.length
            })
        }
    })
})