Dependant Select problems

I have a dependant select to populate the select learning_event.week_fk

            var editor = new $.fn.dataTable.Editor( {
                ajax: "program_data/learning_event_data.php",
                table: "#learning_event_table",
                template: '#learning_event_form',
                fields: [ {
                    label: "Learning Event:",
                    name: "learning_event.learning_event_name"
                }, {
                    label: "Outline:",
                    name: "learning_event.outline",
                    type: "ckeditor"
                }, {
                    label: "Program Outcome:",
                    name: "program_outcome[].program_outcome_pk",
                    type: "select",
                    placeholder: 'No selection',
                    placeholderDisabled: false,
                    placeholderValue: 0,
                    multiple: true
                }, {
                    label: "Unit Group:",
                    name: "learning_event.unit_group_fk",
                    type: "select",
                    placeholder: "Select Unit Group..."
                }, {
                    label: "Week:",
                    name: "learning_event.week_fk",
                    type: "select",
                    placeholder: "Select Week..."
                }, {
                    label: "Presentations:",
                    name: "presentation[].presentation_pk",
                    type: "select",
                    placeholder: 'No selection',
                    placeholderDisabled: false,
                    placeholderValue: 0,
                    multiple: true
                }, {
                    label: "Conditions:",
                    name: "mcondition[].mcondition_pk",
                    type: "select",
                    placeholder: 'No selection',
                    placeholderDisabled: false,
                    placeholderValue: 0,
                    multiple: true
                }, {
                    label: "Type:",
                    name: "learning_event_type[].learning_event_type_pk",
                    type: "select",
                    placeholder: 'No selection',
                    placeholderDisabled: false,
                    placeholderValue: 0,
                    multiple: true,
                        attr: {
                            size: 1
                        }
                } ]
            } );
            
            
            
  editor.dependent('learning_event.week_fk', function(val, data, callback) {
        editor.field('learning_event.unit_group_fk').input().on('change', function(e, d) {
            //check if user or editor initiated update
            if (d && d.editorSet) return;
            $.ajax({
                url: 'program_data/get_weeks.php',
                data: {
                    "unit": editor.get('learning_event.unit_group_fk')
                },
                type: 'POST',
                dataType: 'JSON',
                success: function(data) {
                    callback(data);
                }
            });
        });
    });


            var table = $( '#learning_event_table' ).DataTable( {
                responsive: true,
                "autoWidth": false,
                "lengthMenu": [
                    [ 5, 10, 25, 50, -1 ],
                    [ 5, 10, 25, 50, "All" ]
                ],
                columnDefs: [ {
                    targets: 1,
                    render: $.fn.dataTable.render.ellipsis( 150, true )
                } ],
                ajax: "program_data/learning_event_data.php",
                dom: "Blfrtip",
                columns: [ {
                    data: "learning_event.learning_event_name",
                }, {
                    data: "learning_event.outline",
                }, {
                    data: "program_outcome",
                    render: "[, ].program_outcome"
                }, {
                    data: "unit_group.unit_group"
                }, {
                    data: "week.week"
                }, {
                    data: "presentation",
                    render: "[, ].presentation_name"
                }, {
                    data: "mcondition",
                    render: "[, ].mcondition_name"
                }, {
                    data: "learning_event_type",
                    render: "[, ].learning_event_type_name"
                }, {
                    data: "learning_event.modified"
                }, {
                    data: "learning_event.modified_by"
                }, {
                    data: null,
                    className: "center",
                    defaultContent: '<a href="" class="editor_edit">Edit</a>'
                } ],
                select: {
                    style: 'os',
                    selector: 'td:first-child'
                },
                buttons: []
            } );

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