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How to pass arguments to function in functional component in React


By : Jack Bradley
Date : October 17 2020, 06:10 AM
this will help How can I pass arguments to a function in functional component? As far as I know, creating function in jsx is not good practice right? , You can keep function outside of functional component,
code :
MyComponent = (props) => {
  return <button onClick={(event, props.data) => handleChange(event, props.data)} value='Foo'>Click</button>
}
function handleChange(event, data){
  console.log(event.target.value);
  console.log(data);
}


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Pass down function from container to functional component in React + TypeScript


By : Amika Homes
Date : March 29 2020, 07:55 AM
may help you . I have am trying to create a simple tabs app using React and Typescript. I have a Container component called Tabs that handles state and passes it down to my Content component. I also created a . function called 'handleName' and I am passing it down to my functional component called Sidebar. When the function gets triggered it is supposed to update my state thus re-render my Content component. However, it is not working. And I do not get any errors in my console either. It is just not doing anything. , Change
code :
<Sidebar handleName={() => this.handleName}/>
<Sidebar handleName={this.handleName}/>
handleName = (value: string) => {

React functional component - how do I pass refs back to parent when component returns an array of elements?


By : baikaishiuc
Date : March 29 2020, 07:55 AM
wish helps you Now in React 16.3 you can create refs with React.createRef() and pass them from parent component to child. Here is the docs. So you can map items in the parent component and extend them with ref property.
I hope this will work for you.
code :
class Application extends React.Component {

    items = [
        'first',
        'second',
        'third',
    ].map(item => ({ item, ref: React.createRef() }))

    // you can access refs here: this.items[0].ref
    render() {
        return <div>
            <Paragraphs items={this.items} />
        </div>;
    }
}
const renderItem = (item, index) => {
    return (
        <p key={index} ref={item.ref} > {item.item} </p>
    );
};
const Paragraphs = ({ items }) => _.map(items, renderItem);
ReactDOM.render(<Application />, document.getElementById('root'));

How to create ref in class based component and pass it to the functional component in react?


By : user2752211
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can use forwarding refs to get a ref to the underlying element outside the child component. For example:
code :
const DropdownBox = React.forwardRef((props, ref) => (
    <div ref={ref} className='DropdownBox-Container' style={props.styles}>
      <div className='DropdownBox'>
        <div className='DropdownBox-Triangle' />
        {props.children}
      </div>
    </div>
));
 return (
      <DropdownBox ref={this.dropdownBoxRef} styles={this.props.styles}>
        <ul className='OptionsList'>{options}</ul>
      </DropdownBox>
)

How to call a react hook fetch request in a functional component to access data then pass to a class component to map?


By : user3721939
Date : March 29 2020, 07:55 AM
like below fixes the issue I fixed your sandbox example.
You cannot load the users synchronously (using import) as you need to make a http call to fetch the users so it's asynchronous.

In React, how do I pass arguments into a parent component's handleClick function?


By : Alberto Quinteri
Date : March 29 2020, 07:55 AM
should help you out Try to do this without using arrow function definition inside props (bad for child components performance, as will always be a new function reference more info here)
Parent class does not need the arrow function defined when passing onClick to BettingChips, we can do this at the class level instead, using arrow function to lexically bind this...
code :
class SomeParentComponent extends Component {

  handleClick = (betAmount) => {
    alert(betAmount)
  }

  render() {
    return <BettingChips onClick={this.handleClick} />
  }

}
class BettingChips extends Component {

  onClick = (e) => {
    this.props.onClick(e.target.value)
  }

  render() { 
   return(
     <div> 
       <button onClick={this.onClick} value={1}>1</button>
       // ... etc   
     </div>
    ) 
  }

}
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