SALESFORCE-PD1 User Interface Practice Question
A developer is writing a Lightning Web Component and needs to load a third-party JavaScript library (such as D3.js) stored as a static resource. Which lifecycle hook is most appropriate for initiating the load using loadScript?
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
✓
connectedCallback()
Third-party scripts should be loaded in connectedCallback() because the component must be inserted in the DOM before script tags can be appended.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
constructor()
Why it's wrong here
Incorrect because the DOM is not yet available in the constructor.
- ✗
disconnectedCallback()
Why it's wrong here
Incorrect because disconnectedCallback is for cleanup when the component is removed.
- ✓
connectedCallback()
Why this is correct
Correct because connectedCallback ensures the component is in the DOM for script loading.
- ✗
renderedCallback()
Why it's wrong here
Incorrect because renderedCallback runs multiple times and would reload the script repeatedly unless guarded.
About these practice questions
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JA
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
This SALESFORCE-PD1 practice question is part of Courseiva's free Salesforce certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SALESFORCE-PD1 exam.