How to populate dependable drop-down using Ajax and php [closed]

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Yes, check following jquery ajax code.
In this example, if you change “Department” then it will populate the listing of “Name” dropdown.

$(document).on("change", '#department', function(e) {
            var department = $(this).val();
            

            $.ajax({
                type: "POST",
                data: {department: department},
                url: 'admin/users/get_name_list.php',
                dataType: 'json',
                success: function(json) {

                    var $el = $("#name");
                    $el.empty(); // remove old options
                    $el.append($("<option></option>")
                            .attr("value", '').text('Please Select'));
                    $.each(json, function(value, key) {
                        $el.append($("<option></option>")
                                .attr("value", value).text(key));
                    });														
	                

                    
                    
                }
            });

        });

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