SALESFORCE-PD1 User Interface Practice Question
A developer is working with a Lightning Web Component and needs to access a child component's public method from the parent component. How is this achieved?
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
✓
Invoke the method directly on the child element reference obtained via template.querySelector().
Public methods on child components must be decorated with @api and invoked via this.template.querySelector().methodName().
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bind the child method to a public @api property on the parent.
Why it's wrong here
Properties pass data down, not methods.
- ✗
Fire an application event from the parent to the child.
Why it's wrong here
LWC does not support application events; CustomEvents are used.
- ✗
Use document.getElementById() to find the child element.
Why it's wrong here
DOM queries must use shadow-dom-compliant methods like this.template.querySelector().
- ✓
Invoke the method directly on the child element reference obtained via template.querySelector().
Why this is correct
Public child methods are callable directly from the parent via the component reference.
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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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