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122 vFoglight

Web Component Guide

Views Tab

The Views tab is used in the Iterator (where it is called an Iterator View), Report,

Switch, Tab Container, Topology, and Type containers. The tab incorporates an editor

for setting views for the container.

Context and the Context Tab

Context is the term used for the information available at a given point in time to the

various components used by the Web Component Framework. Context in the Web

Component Framework is similar to a collection of variables that are used in

programming languages or an operating system’s environment variables. Every element

of the context has a key (name), a corresponding type, and a run time value in an active

vFoglight instance.

For example, a view that is configured to display alarm data for any one host must be

provided with a specific host to give it context. Similarly, a Memory Usage page, which

displays memory data for a specific host given a time range, must be provided with two

context inputs. In the first example, the host is the context. In the second example the

host and the time range together comprise the context.

Pages and views can be compared to forms whose fields are filled in at run time. The

context definitions determine the actual data that is specified by the Context, which is

set in the following ways:

• A time range, which is available to all components.

• The Context tab in the View editor—you declare context inputs to the component

here. You can define additional context entries here as well.

• The Configuration tab in the View editor—for example, by setting row/cell

properties and choosing an available built-in context such as <currentRow>.

Context consists of:

key The strongly typed, case insensitive string that references a

particular context element. Type checking is done at design

time.

value The value stored in the context element, which can be either a

Web Component Framework data object or a Java object.

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