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36 vFoglight

Web Component Guide

The required item is a key, which indicates that a context entry must be declared

before it can be used. You can extract information from the context, which was

perhaps set in a parent view or in the Additional section of the Label’s Context

tab, and display it as the label’s string. Thus, the label’s text can be dynamic and

be made to depend on a user’s choice at run time.

• Query Selection

The chief way of extracting results from the data model at run time is by using a

query, which returns a list of data objects. Often, the list contains a single data

object, and you can select the specific piece of information you want in that

object and use it as the label’s display string. There are many options for using a

query selection, including one for the case where the query returns an empty list.

The accompanying figure shows that the same choices for selecting the data apply

to this case too.

The Query Selection dialog:

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Dell Vizioncore Guide de l'utilisateur Page 36