Limiting the TaxonomyWebTaggingControl possible selections

Question

Assuming I have a term set with all the countries. The first level is the continents The second level is the countries. No I am building a web part with a dropdown of the continents and a WebTaggingControl from the term set. How can I force the WebTaggingControl to show only the continent selected in the dropdown?

The actual usage is not with countries but this is a good representation of the issue :-)

Thanks in advance

Answer 1

It could be accomplished by specifying AnchorId property for TaxonomyWebTaggingControl control.
This property allows to specify ID of parent Term for any valid value in control.

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Assume we have the following structure for the countries:

• the first level is the continents
• the second level is the countries

If we initialize TaxonomyWebTaggingControl control and specify for AnchorId Europe Term Id value

 /// <summary>
/// Initializing TaxonomyWebTaggingControl control
/// </summary>
/// <param name="countryControl"> </param>
/// <param name="session"></param>
/// <param name="continentTerm"></param>
private void InitCountriesControl(TaxonomyWebTaggingControl countryControl, TaxonomySession session, Term continentTerm)
{
    countryControl.SSPList = continentTerm.TermStore.Id.ToString();
    countryControl.AnchorId = continentTerm.Id;
    countryControl.TermSetList = continentTerm.TermSet.Id.ToString();
}

then only countries for selected continent will be displayed

For more details and how to implement Country picker based on Countries term set please see my blog - Using SharePoint TaxonomyWebTaggingControl control: specifying parent terms