GET and POST requests in Flutter - UI Render Trace

Component - GET and POST requests

This Flutter component shows how to fetch data from the internet using a GET request and send data using a POST request. It has a button to load data and a form to send data. The UI updates to show the results or loading status.

Widget Tree

Scaffold
├── AppBar
│   └── Text
└── Padding
    └── Column
        ├── ElevatedButton
        ├── Text
        ├── TextField
        ├── ElevatedButton
        └── Text

The Scaffold provides the basic screen structure with an AppBar showing the title. Inside the body, Padding adds space around the content. A Column arranges widgets vertically: a button to fetch data, a text widget to show fetched data or loading status, a text field to enter data for POST, another button to send data, and a text widget to show the POST response.

Render Trace - 7 Steps

Step 1: Scaffold

Step 2: Column

Step 3: ElevatedButton (Fetch Data)

Step 4: Text (Display GET result)

Step 5: TextField

Step 6: ElevatedButton (Send Data)

Step 7: Text (Display POST result)

State Change - Re-render

Trigger:User taps 'Fetch Data' button

Before

GET result text shows 'Press Fetch Data'

→

After

GET result text shows 'Loading...' then updates to fetched data

Re-renders:The Text widget displaying GET result re-renders

UI Quiz - 3 Questions

What happens on the screen when you tap the 'Fetch Data' button?

A The text below the button changes to 'Loading...' then shows fetched data

B The input field clears automatically

C The 'Send Data' button disappears

D The app navigates to a new screen

Key Insight

In mobile apps, showing clear feedback during network requests helps users understand what is happening. Using buttons to trigger GET and POST requests and updating text widgets to show loading and results creates a simple, friendly experience.