React unable to pass paramaeter

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Active3 hr before
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8 Answers

unablereact
90%

This will create a new function that calls handleSort with the right params.,Simply create a function like this,Third way is this :- <th value={column} onClick={() => that.handleSort} >{column}</th> ,Use the arrow function while creating it as :-

Use an arrow function:

return (
  <th value={column} onClick={() => this.handleSort(column)}>{column}</th>
);

Sub-component

class TableHeader extends Component {
  handleClick = () => {
    this.props.onHeaderClick(this.props.value);
  }

  render() {
    return (
      <th onClick={this.handleClick}>
        {this.props.column}
      </th>
    );
  }
}

Main component

{this.props.defaultColumns.map((column) => (
  <TableHeader
    value={column}
    onHeaderClick={this.handleSort}
  />
))}

Use .bind to pass the parameter you want, this way you are binding the function with the Component context :

return (
  <th value={column} onClick={this.handleSort.bind(this, column)}>{column}</th>
);
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88%

You can use an arrow function to wrap around an event handler and pass parameters:,Generally speaking, yes, it is OK, and it is often the easiest way to pass parameters to callback functions.,Pass event handlers and other functions as props to child components:,Using this technique will only capture the last published value in a frame. You can see an example of how this optimization works on MDN

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72%

I cannot manage to pass parameters from my root navigator to a screen in my drawer navigator. I'm trying to pass the 'test' prop to the screen inside my drawer Navigator (HomeScreen). It doesn't work, the variable stays undefined in the HomeScreen., Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. ,this is not a bug, it's how params behave. you navigated to the drawer route, so that route has the param. if you want another route to have the param, navigate there instead:,Thanks. Unfortunately, if I directly navigate to BeastList, then my drawer won't get the 'test' prop. Someone told me I shouldn't do what you recommend: link

  login() {
      this.props.navigation.navigate( 'Home', { test: 'titi' });
  }
...
        <Button
          title="Login"
          onPress={ () => this.login() }
        />
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65%

A common question followed by this act: how to pass the data as params (parameters) from one React component to another component? That’s because you don’t want to have a component rendering static data, but pass dynamic data to your component instead. That’s where React’s props come into play. You can pass data in React by defining custom HTML attributes to which you assign your data with JSX syntax. So don’t forget the curly braces.,This a common question for React beginners and the answer for it is brief: there is no way to pass props from a child to a parent component. Let’s revisit the previous example, but this time with an additional Button component for the toggle mechanism.,Passing only props from component to component doesn’t make the component interactive, because nothing is there to change the props. Props are read-only. That’s the time when React state comes into play which can be changed. The state is co-located to a React component.,Note: It is important to note that is could lead to performance issues because every time the component renders a new object is created again. But it can be a premature optimization as well when learning only about React.

Normally you start out with React’s JSX syntax for rendering something to the browser when learning about React. Basically, JSX mixes HTML with JavaScript to get the best of both worlds.

import React, { Component } from 'react';class App extends Component {  render() {    const greeting = 'Welcome to React';    return (      <div>        <h1>{greeting}</h1>      </div>    );  }}export default App;
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75%

The variables a and b are the arguments of that function.,The syntax of props in JSX (the syntax extension to JavaScript that is commonly used in React), is just very similar to the syntax of HTML properties, accepting key-value pairs inside the tag.,They are to React components what arguments are to functions.,The next step is to move the variables to the parent component and pass it down as a prop.

.css-194xkmm{position:absolute;right:22px;top:24px;padding:8px 12px 7px;border-radius:5px;color:#6f7177;-webkit-transition:background 0.3s ease;transition:background 0.3s ease;}.css-194xkmm:hover{background:rgba(255,255,255,0.07);}.css-194xkmm[data-a11y="true"]:focus::after{content:"";position:absolute;left:-2%;top:-2%;width:104%;height:104%;border:2px solid var(--theme-ui-colors-accent,#394EFF);border-radius:5px;background:rgba(255,255,255,0.01);}@media (max-width:45.9375em){.css-194xkmm{display:none;}}Copy 1const Card = () => {2  return(3    <div className="box">4      <h1 className="title">react</h1>5      <p className="category">verb</p>6      <p>7        1. act in response to something; respond in a particular way.8        "he reacted angrily to the news of his dismissal"9      </p>10    </div>11  );12}
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40%

You can create a function that returns a function.,Sometimes passing an additional parameter values or arguments is necessary for you onClick handler.,What you have to do is add a custom data-attribute to your HTML element.,You can also create a React component that accepts 2 properties.

You can create a function that returns a function.

class FooBar extends React.Component {
  handleClick = value => () => {
    console.log(value);
  };

  render() {
    return <button onClick={this.handleClick('Bar')}>Speak</button>;
  }
}
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22%

/* PASSING THE PROPS to the 'Greeting' component */
const expression = 'Happy';
<Greeting statement='Hello' expression={expression}/> // statement and expression are the props (ie. arguments) we are passing to Greeting component

/* USING THE PROPS in the child component */
class Greeting extends Component {
  render() {
    return <h1>{this.props.statement} I am feeling {this.props.expression} today!</h1>;
  }
}
60%

If clicked, the user would be taken to /tylermcginnis and the Profile component would be rendered. Profile would be able to access the dynamic URL parameter (tylermcginnis) by using the useParams custom Hook.,Notice that handle has a : in front of it, that’s because it’s going to be dynamic. It could be anything from tylermcginnis or dan_abramov to realDonaldTrump.,Now the question becomes, how does the component that’s being rendered when the user goes to /tylermcginnis get access to the fromNotifications property? Anytime you pass data along via the state property, that data will be available on location.state which you can get access to by using the custom useLocation Hook that comes with React Router v5.,First, let’s take a look at URL parameters. If you’ve read our URL Parameters post, you’ll be familiar with this example. Say we were in charge of building out the Route that renders Twitter’s profile page. If created with React Router v5, that Route would probably look something like this.

<Route path="/:handle">
   <Profile />
</Route>
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