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  • Peter Aderhold 30 posts 204 karma points
    Jan 05, 2020 @ 13:17
    Peter Aderhold
    0

    How to add PreValues programmatically into DropdownList in v8?

    Hi folks,

    I found some examples for v7 and earlier, but not for v8. Anyone knows how to do this?

    I have so far:

    public static void SetDataTypePreValues(int id, List<string> values)
    {
        var dataTypeService = Current.Services.DataTypeService;
        var dataType = dataTypeService.GetDataType(id); // this is the dropdownlist
        // and now???

    }

    Thank you for your help.

    Peter

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  • Peter Aderhold 30 posts 204 karma points
    Jan 05, 2020 @ 14:22
    Peter Aderhold
    101

    What I did for now is:

    var valueList = (ValueListConfiguration)dataType.Configuration;
        var lastId = valueList.Items.LastOrDefault()?.Id;
        var newValueList = new List<ValueListConfiguration.ValueListItem>();
        var idCounter = lastId ?? 0;
        foreach (var val in values)
        {
            newValueList.Add(new ValueListConfiguration.ValueListItem
            {
                Id = idCounter,
                Value = val
            });

            idCounter++;
        }
        ((ValueListConfiguration)dataType.Configuration).Items.AddRange(newValueList);
        dataTypeService.Save(dataType);

    I don't know if this is the best way to do it, but at least it works.

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  • Alasdair 5 posts 76 karma points
    May 29, 2021 @ 18:47
    Alasdair
    1

    Thanks for sharing Peter!

    By combining your value adding with this answer: https://our.umbraco.com/forum/extending-umbraco-and-using-the-api/97597-creating-custom-data-type#comment-308044

    I was able to create a composer to migrate a collection of select lists from a bespoke CMS. Hopefully this helps someone else.

    public class CreateDataTypeComponent : IComponent
{
    private readonly ILogger _logger;
    protected IDataTypeService dataTypeService = Current.Services.DataTypeService;
    public static DbMigrate db = new DbMigrate();

    public CreateDataTypeComponent(ILogger logger)
    {
        _logger = logger;
    }

    public void Initialize()
    {
        var select_list = db.policy_select_list_types;
        foreach (var list in select_list)
        {
            string dataTypeName = "Dropdown - " + list.name;
            const string editorAlias = "Umbraco.DropDown.Flexible";

            var exists = dataTypeService.GetDataType(dataTypeName) != null;
            if (!exists)
            {
                var created = Current.PropertyEditors.TryGet(editorAlias, out IDataEditor editor);
                if (created)
                {
                    DataType newDataType = new DataType(editor)
                    {
                        Name = dataTypeName
                    };

                    var values = db.policy_select_list_values.Where(x => x.select_list_id == list.id);
                    var newValueList = new List<ValueListConfiguration.ValueListItem>();
                    var idCounter = 0;
                    foreach (var val in values)
                    {
                        if (val.display_text != "")
                        {
                            newValueList.Add(new ValueListConfiguration.ValueListItem
                            {
                                Id = idCounter,
                                Value = val.display_text
                            });

                            idCounter++;
                        }
                    }
                    ((ValueListConfiguration)newDataType.Configuration).Items.AddRange(newValueList);

                    dataTypeService.Save(newDataType);
                    int newDataTypeId = newDataType.Id;
                    _logger.Info<CreateDataTypeComponent>(newDataType.Name + " : " + newDataType.Id);

                }
            }
        }
    }
    public void Terminate()
    {
    }
}
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  • Khupi 7 posts 117 karma points
    Sep 20, 2022 @ 14:26
    Khupi
    0

    Works like a charm, I wouldn't know how to include ValueListConfiguration property. Thanks buddy

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