How to Update Output Values Across Components in Power Apps PCF Development?
Table of Contents
Question
You are developing an interactive new code component by using the Power Apps component framework.
You need to ensure that the output value provided in a textbox is updated in other components.
Which two actions should you perform? Each correct answer presents part of the solution. Choose two.
Select all answers that apply.
A. Create an event handler for the textbox for its change event.
B. Create an event handler for the other components for its change event.
C. Invoke the notifyOutputChanged method from the init method.
D. Invoke the updateView method from the event handler.
E. Invoke the notifyOutputChanged method from the event handler.
F. Invoke the notifyOutputChanged method from the updateView method.
Answer
A. Create an event handler for the textbox for its change event.
E. Invoke the notifyOutputChanged method from the event handler.
Explanation
This item tests the candidate’s knowledge of implementing component interfaces.
When a value is changed in an interactive code component, the registered event handler is invoked. To ensure that the new value provided in the output control is notified to the host, we need to invoke the notifyOutputChanged method from the event handler method. Once the notifyOutputChanged method is invoked, the updateView method will be invoked by the hosting runtime after validating the output value.
The updateView method is invoked by the framework when any value in the component’s property bag has changed. The init method is used to initialize the component instance and cannot be used to get updated value in a textbox by invoking the notifyOutputChanged method. You do not need to create an event handler for the other components for its change event because the new value would be set by using the updateView method by the runtime.
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