How to get input value upon button click

Question

What I am trying to do is, upon clicking the Submit button, I want to grab the value that was typed into the input to then update the h1.

import React from "react";

function App() {
  const [headingText, setHeadingText] = React.useState("");

  function handleChange(event) {
    setHeadingText(event.target.value);
  }

  function handleSubmit(event) {
    alert(event.target);
  }

  return (
    <div className="container">
      <form onSubmit={handleSubmit}>
        <h1>Hello {headingText}</h1>
        <input
          onChange={handleChange}
          type="text"
          placeholder="What's your name?"
          value={headingText}
        />
        <button type="submit">Submit</button>
      </form>
    </div>
  );
}

export default App;

With the above code, so far I am able to update the h1 after every single keystroke that is entered into the input. But instead of that, I want to only update the h1 with the input value when I press the Submit button.

Samathingamajig · Accepted Answer · 2021-06-17 19:52:49Z

1

You'll need to use 2 useState's, one to hold the value of the input box, the other to hold the value of the header.

// import React from "react"; // not On StackOverflow

function App() {
  const [headingTextBuffer, setHeadingTextBuffer] = React.useState("");
  const [headingText, setHeadingText] = React.useState("");

  function handleChange(event) {
    setHeadingTextBuffer(event.target.value);
  }

  function handleSubmit(event) {
    event.preventDefault();
  
    setHeadingText(headingTextBuffer);
  }

  return (
    <div className="container">
      <form onSubmit={handleSubmit}>
        <h1>Hello {headingText}</h1>
        <input
          onChange={handleChange}
          type="text"
          placeholder="What's your name?"
          value={headingTextBuffer}
        />
        <button type="submit">Submit</button>
      </form>
    </div>
  );
}

// export default App; // not on StackOverflow

ReactDOM.render(<App />, document.querySelector("#root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>

<div id="root"></div>

edited Jun 17, 2021 at 19:52

answered Jun 17, 2021 at 19:50

Samathingamajig

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4 Comments

Mark D. Foti Over a year ago

Thank you so much!! Going to try this now

Samathingamajig Over a year ago

I had a couple of typos, click "Run code snippet" to see in action

Mark D. Foti Over a year ago

No worries--I noticed the typos--no big deal! Thx!

Samathingamajig Over a year ago

Btw, this also updates when you press enter/return on your keyboard due to the <form> tag

cerwind · Accepted Answer · 2021-06-17 19:49:57Z

1

One way you could do this is using an inputText state that is updated in your handleChange function.

Now when you submit in your submit function you can update the headingText state to be equal to the inputText which should update your h1 value.

answered Jun 17, 2021 at 19:49

cerwind

1322 silver badges5 bronze badges

Comments

Samathingamajig · Accepted Answer · 2021-06-17 19:55:20Z

You could put the result of each keystroke in the state in another field that is not displayed anywhere and on click put the value from that new field into the heading. Like this :

import React from "react";

function App() {
  const [tempHeadingText, setTempHeadingText] = React.useState("");
  const [headingText, setHeadingText] = React.useState("");

  function handleChange(event) {
    setTempHeadingText(event.target.value);
  }

  function handleSubmit(event) {
    setHeadingText(tempHeadingText);
  }

  return (
    <div className="container">
      <form onSubmit={handleSubmit}>
        <h1>Hello {headingText}</h1>
        <input
          onChange={handleChange}
          type="text"
          placeholder="What's your name?"
          value={tempHeadingText}
        />
        <button type="submit">Submit</button>
      </form>
    </div>
  );
}

export default App;

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