FAQ: React Forms - Update an Input's Value

This community-built FAQ covers the “Update an Input’s Value” exercise from the lesson “React Forms”.

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This exercise can be found in the following Codecademy content:

Web Development

Learn ReactJS: Part II

FAQs on the exercise Update an Input’s Value

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what is the purpose of step 1 of this exercises? That is, how does adding the value attribute do anything? I tried running without it, and the h1 was still responsive to my input.

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I’m wondering the same…

I’m not 100% sure, but it seems that setting the value attribute to be this.state.userInput makes the Input component “controlled” (see the next exercise entitled Controlled vs Uncontrolled). The React documentation on forms says that the <input /> element has its own state (what users enter) by default. The React component also stores it as its own state. We don’t want two truths to exist. So we override the <input/> element’s state with the React component’s state.

Can someone confirm if my answer is correct?

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