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The Web Component Framework 63

Core Concepts

and a link takes it to another view, then that new view can get access to that value by

specifying its name as a context input.

For more information, see “Context and the Context Tab” on page 122.

Parameters

Most types of Runtime Values have parameters. These are placeholders nested within

the Runtime Value that are also evaluated at run time. An example is a String Template

Runtime Value set to Host: {0}. In this case Host: is a fixed string, while {0} is a

reference to a parameter that evaluates to the name of the host server by configuring that

association to a particular dynamic context at the time when the String Template

Runtime Value is being defined. Each description of the Runtime Value types explains

how to use parameters.

Caution Any quotation mark you use in the parameterized string must be escaped. For example,

if the string that you want to use is The host’s name is: {0}, you must escape the

apostrophe as follows:

The host\’s name is: {0}

For more information, see “Configurable Properties and Runtime Values” on page 130.

On Null Values

Most types of Runtime Value have an associated On Null Runtime Value. This provides

an alternate value that can be used if the main Runtime Value evaluates to null (nothing)

or an empty list of values.

Renderers

A renderer may be specified on each type of Runtime Value. A renderer determines how

the evaluated value is displayed. For example, a limit to the length of a string, the

number of decimal places, or the date and time format. If no renderer is specified, then

default renderers are used. Therefore, in most cases, a renderer is not required.

Null and error renderers, noted earlier in the list of simple types, are special cases of

renderers. They are only used to display no data or error information. Unlike normal

renderers, they do not base their behavior on the data being rendered, but instead have

fixed outputs. A drop-down menu lists all the available renderers. Generally, you can

determine which renderer to select based on its name. If no renderer is specified,

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Dell Vizioncore Guía de usuario Pagina 63