React Essentials · Forms & Events · Lesson 13 of 26
Controlled Inputs
Concept
Controlled Inputs
A controlled input's value is driven by React state, so state and the UI always stay in sync.
By the end of this lesson
- Explain the core idea behind Controlled Inputs.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Controlled Inputs. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Build a controlled input that shows a live character count.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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