SALESFORCE-PD1 User Interface Practice Question
A developer creates a parent Lightning Web Component containing a child component. The parent needs to call a public method defined inside the child component. How is this accomplished?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use this.template.querySelector('c-child-component').publicMethodName() in the parent component.
A parent component can invoke a public method on a child component by querying the child element and calling the method directly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use the publish() method of the Lightning Message Service.
Why it's wrong here
Incorrect because LMS is unnecessary for direct parent-child method invocation.
- ✗
Update a shared reactive property passed down via @api.
Why it's wrong here
Incorrect because reactive properties flow down, but imperative execution requires calling the child method directly.
- ✗
Dispatch an event from the parent and listen to it in the child component.
Why it's wrong here
Incorrect because events go child-to-parent; calling a method directly is parent-to-child.
- ✓
Use this.template.querySelector('c-child-component').publicMethodName() in the parent component.
Why this is correct
Correct because querying the child component reference allows calling its exported @api methods.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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