How can you combine Flask and JavaScript to update the GPIO pin status on a web page without refreshing the page?

hard🚀 Application Q9 of 15

Raspberry Pi - Web Server and API

AReload the entire Flask page every second to update status

BUse Flask to serve API endpoints and JavaScript fetch() to poll pin status asynchronously

CUse Flask to send pin status only on initial page load

DUse JavaScript alert() to show pin status changes

Step-by-Step Solution

Solution:

Step 1: Understand asynchronous updates
JavaScript fetch() can call Flask API endpoints without page reload.
Step 2: Use this to update GPIO status dynamically
Polling or event-driven fetch updates pin status on page smoothly.
Final Answer:
Use Flask to serve API endpoints and JavaScript fetch() to poll pin status asynchronously -> Option B
Quick Check:
Async fetch + Flask API = A [OK]

Quick Trick: Use fetch() to get GPIO status from Flask API without reload [OK]

Common Mistakes:

MISTAKES

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