TaxonomyField.GetWssIdsOfTerm in JSOM (SharePoint 2013)

Question

For building a CAML query including filters by Managed Metadata Column, I need to get the wssid for terms I've only the unique ID.

I found a lot of examples using C# and Microsoft.SharePoint.Taxonomy.TaxonomyField.GetWssIdsOfTerm, but now example using the JavaScript Object Model.

Is this even possible with JavaScript?

Example

var ctx = SP.ClientContext.get_current();
var taxSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(ctx);
var termStores = taxSession.get_termStores();
var termStore = termStores.getByName('My Termstore');
var currentTermSet = termStore.getTermSet('f71f5e3f-d393-4ad8-a648-b6ca20f2ce75');
ctx.load(currentTermSet);

ctx.executeQueryAsync(
    function () {
        var terms = currentTermSet.get_terms();
        ctx.load(terms);
        ctx.executeQueryAsync(
            function () {
                var termsEnum = terms.getEnumerator();
                while (termsEnum.moveNext()) {
                    var currentTerm = termsEnum.get_current();

                    var termUniqueID = currentTerm.get_id();
                    var termLabel = currentTerm.get_name();
                    // How to get the wssid which is needed for filtering in CAML?      
                }                       
        });
});

Answer 1

In JSOM API use SP.Taxonomy.TaxonomyFieldValue.wssId property to get the list item ID of the list item containing the taxonomy field value that is encapsulated by the TaxonomyFieldValue object.

Example

var listTitle = 'Contacts';
var listItemId = 1;
var taxFieldName = 'Country';

var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var list = web.get_lists().getByTitle(listTitle);
var item = list.getItemById(listItemId);

ctx.load(item);
ctx.executeQueryAsync(
     function() {
         var taxFieldValue = item.get_item(taxFieldName);
         console.log(taxFieldValue.get_wssId());
     },
     function(sender,args){
        console.log(args.get_message());
     }
);

Note: a single-valued taxonomy field (SP.Taxonomy.TaxonomyFieldValue type) is used in the example

Answer 2

I'm not sure if this is what you were trying to do, but in my case I was able to filter a Managed Metadata field by simply evaluating it as a text field. No need for the WSSID.

For example if your column is called Category and you want to filter the items tagged with "Meetings" you could do:

<Eq>
    <FieldRef Name="Category" />
    <Value Type="Text">Meetings</Value>
</Eq>