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How to setState from function parameter in React


By : Dani Lozano
Date : September 16 2020, 06:00 AM
Does that help In order to use this in a callback function, as told in the comments you have to bind it in the constructor or use an arrow function.
Also, since your name is a variable, you can't update your state like:
code :
this.setState({ name: value }
handleChange = (name, value) =>
  this.setState({ [name]: value }, () => this.financeCalcualte());


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React is it possible to setState with an function parameter?


By : Kristoffer Olsson
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Hello i am trying to use a function to set my Modals state and i got alot of modals so what i am doing is trying as this , Add square bracket [] to your code:
code :
openModal(state) {
  console.log(state);
  this.setState({ [state]: true}, () => console.log(this.state.doneModal));
}

React setState prevState parameter and Array#map


By : Diji
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , .map creates a new array, but the object inside the array are still reference to the state's object.
One approach is to shallow copy the state's object to the new array:
code :
const persons = this.state.persons.map( pers => {
  // Do the shallow copy
  if (pers.id === id) {
    return {
      ...pers,
      name: value
    };
  }

  // Return the reference, because we don't do any mutations
  return pers;
});

React SetState Twice in Same Function


By : Sam Rajan
Date : March 29 2020, 07:55 AM
help you fix your problem First,setState is an asynchronous function,so you can't decide when the first setState runs.So I recommend to force it run synchronous.
code :
this.setState({chess_board: new_board},()=> {console.log(this.state.chess_board)})
setTimeout(this.chess_engine_move(),3000);// delay 3s

How to pass query parameter to api using map method and concatenate every json response to setState in react?


By : user2116901
Date : March 29 2020, 07:55 AM
I wish this helpful for you If I understand your question correctly, then the only adjustment needed here is to update your setState() logic so that you append articles from your response to the articles array in your state:
code :
this.state.newsPaper.map(async (querypara) => {

    const requstone = await fetch(`https:someapisources=${querypara}&apiKey=${api_key}`);
    const dataone = await requstone.json();

    // Concatenate articles from response (dataone) to array in state
    this.setState({
        articles: this.state.articles.concat(dataone.articles)
    });
}

React setState for API doesn't update even thought it gets new parameter


By : user3692636
Date : March 29 2020, 07:55 AM
help you fix your problem I'm guessing it is your getRecipes function. React's setState is "asynchronous, but not in the javascript async/await sense. It is more like state updates during the current render cycle are queued up to be processed for the next render cycle.
code :
getRecipes = async e => {
  this.setState({
    loading: true
  });

  await recipesRequest(e).then(response => {
    this.setState({
      recipes: response,
      loading: false
    });
  });
};
getRecipes = e => {
  this.setState({
    loading: true
  });

  recipesRequest(e).then(response => {
    this.setState({
      recipes: response,
      loading: false
    });
  });
};
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