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Showing posts from January, 2017

Getting or Setting Multi-Value Metadata Fields with the REST API

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A couple of years ago, I published a series of posts on getting and setting taxonomy field values in SharePoint workflows by using the REST API in custom workflow activities. These custom activities have served me well, but they've always been unable to work with multi-value taxonomy fields. It's time to fix that.

Background As you probably already know, when you add a taxonomy field to a SharePoint list, SharePoint adds a corresponding hidden note field. For example, if you add a taxonomy field named Colours, you actually get:

A taxonomy field named Colours. Depending on whether the column allows the user to select multiple terms, the field accepts values of type SP.Taxonomy.TaxonomyFieldValue or Collection(SP.Taxonomy.TaxonomyFieldValue).A hidden note field, probably named Colours_0.  The hidden note field stores the contents of the field in a term string format. In a single-value taxonomy field, the format looks like this:
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And in a mult…