This page is for application designers who need to configure functionality in table-actions. It explains how to set context parameters.

Overview

When a user triggers a record-action, table-action, PhixFlow can take into account other values or attributes to decide whether or not to run. These are called context

parameters. At the start of a table-action, PhixFlow calculates the context parameters first. This is because they are needed to decide whether or not to run the table-action. This is called action validation.

Use context parameters to identify values:

• to pass from one screen to another
• for action validation
• that determine record-actions
• to determine what your action will do.
  Examples include:
  • which screen will open after the action completion
  • which updates will take place (using record-action rules)
  • whether or not a task plan will run.

Context parameter values can come from:

• a field in a form
• a calculation.
  The source values for the calculation can be
  • a field in a form
  • previous context parameters
• results obtained from lookups.

You cannot directly refer to a context parameter from another context parameter. However, you can refer to a dollar $-variable that is defined in another context parameter expression. Make sure the dollar variable will be calculated before the current context parameter expression is evaluated. This can be useful to avoid repeating the same calculation. For example, sometimes you need to use a value in both a record-action and screen-rule. 

In the table-action properties → Context Parameters section, the Include Previous Context Parameters adds to the context parameters of your table-action any existing context parameters from the screen. You can overwrite them by including it in your table-action and giving it a new value.

For information about setting a global $-variable using a context parameter, see Using Variables.

This properties tab is not available from the repository. It opens from an

Table-Action properties → Context Parameters section.

Insert excerpt
_property_tabs _property_tabs name basic-h nopanel true

Basic Settings

Example Context Parameter

A view called Customers shows a list of customers including the account ID, name and other account details. You want to create

a button to open up another

screen, containing a view called Invoices, which will show the invoices for the customer selected on the Customers view. To do this:

1. Add an action button to the Customers view, and configure it to open the

1. screen containing the Invoices view.
2. Add a context parameter called Account to the table-action, with the context parameter expression set to customers.account_id.
3. On the background filter of the Invoices view, set the filter to only select those invoices whose account_id is equal to _context.account.

Referring to a Context Parameter

The values returned by the context parameter expressions can be referenced by:

• the validation expression
• the filter
• the maximum and minimum items expressions
• any table-action attribute expressions
• any screen opened by this table-action.

The context values are referenced using the syntax:

_context.<context parameter name>