this.setState is undefined

by

When you extend React.Component with ES2015 class syntax you need to bind your action handlers to a context of your class.

Try this: onChange={e => _handleTextChange(e)}

Generally, it’s better not to use arrow functions or bind methods inside render as it generates a new copy of the function on any render call. Move function declaration to the class constructor.

I personally prefer to use arrow functions as class properties in this case

class MyClass extends React.Component {

  handleClick = () => {
    // your logic
  };

  render() {
    return (
      <button onClick={this.handleClick}>Click me</button>
    );
  }
}

It’s not a part of ES2015 specification but babel stage-0 preset supports this syntax

You can read more about context binding in React in this article

More Related Contents:

  1. Is there a “Best Practices” on designing an application written both in React and React-Native?
  2. 404 Not Found when trying to install ESLint 8.4.4 with create-react-app
  3. Hide keyboard in react-native
  4. Why, exactly, do we need React.forwardRef?
  5. Is using async componentDidMount() good?
  6. How to re-render flatlist?
  7. How to reset TabNavigator when user logs out (from other screen)
  8. What will happen if I use setState() function in constructor of a Class in ReactJS or React Native?
  9. How to create helper file full of functions in react native?
  10. Axios get in url works but with second parameter as object it doesn’t
  11. How to debug react native apps in visual studio code?
  12. When to use useImperativeHandle, useLayoutEffect, and useDebugValue
  13. How to use comments in React
  14. Requires Babel “7.0.0-0” but was loaded with “6.26.3”
  15. React Native project, index.ios.js or index.android.js not generated
  16. What does the colon mean in Javascript after function?
  17. What is the difference between using constructor vs getInitialState in React / React Native?
  18. Axios: chaining multiple API requests
  19. Found 4 vulnerabilities on npm install
  20. Invariant Violation: The navigation prop is missing for this navigator
  21. VirtualizedList: You have a large list that is slow to update
  22. React native change listening port
  23. How to add sourcemap in React Native for Production?
  24. how to change jest mock function return value in each test?
  25. Disable back button in react navigation
  26. how to async/await redux-thunk actions?
  27. PhaseScriptExecution [CP-User] error in React Native
  28. How to test Async Storage with Jest?
  29. react native post form data with object and file in it using axios
  30. How to update array state in react native?

Leave a Comment