Oracle Visual Builder: Applications That Outlive Their First Release · Module 8 · Action chains and events
Events: what can start one
Lesson 79 of 176 · 3 min
A BUTTON, A PAGE LOADING, A VALUE CHANGING, A SERVICE RETURNING. The catalogue, and THE ONES PEOPLE FORGET EXIST. Almost everybody uses two of these and builds around the absence of the rest, which produces work the framework would have done. A BUTTON IS THE OBVIOUS ONE AND NEEDS NO EXPLANATION. A component fires an event, a chain runs. PAGE LIFECYCLE IS THE SECOND MOST USED AND THE MOST MISUSED. Page-enter is where data loading belongs, and the mistake is putting too much there — four service calls before anything renders is four round trips a user waits through, and Module 15 is about pages that did that. VALUE-CHANGE IS THE ONE PEOPLE FORGET AND THEN REBUILD BY HAND. Module 4 Lesson 8's subject: a variable changes, a chain runs. Without it, every place that can set the value has to remember to also trigger the reload — which is…
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In this module: Module 8 · Action chains and events
- 1What an action chain isFree preview
- 2Events: what can start one
- 3The common actions
- 4Conditions and branching
- 5Chains that call chains
- 6Waiting: asynchronous steps
- 7Failure inside a chain
- 8JavaScript, and when to reach for it
- 9Keeping a chain readable
- 10Debugging one that misbehaves
- 11Logic that does not belong here
- 12What breaks: four action chain failures
- 13Lab briefing · A chain that survives being read