React child component only receiving first element as prop

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elementcomponentreact
90%

Have you try to console log the array elements and make sure it is not empty in the parent element?,Posting your array info would be helpful., Needs more details. Probably your this.state.resp is an array that only has one element. That's only the first element contains something else than undefined. – Olavi Apr 22 '20 at 19:58

Posting your array info would be helpful.

console.log(this.state.resp[1]);
88%

Pretag
 Pretag team - issue, fix, solve, resolve
72%

One of React’s most useful features is the ability for components to receive and render child elements. It makes it ridiculously easy to create reusable components. Just wrap props.children with some markup or behavior, and presto.,React makes it easy to pass children to reusable components. But what if those children need to receive data from the component that renders them?,You can pass a render function to your component in place of its children.

const Panel = (props) =>
  <div className="Panel">
    {props.children}
  </div>
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65%

One last thing we need to do is make sure that we are initializing these new pieces of state in our constructor.,OK. Excellent! Now let's pass this through props to our ZipForm like so.,Pretty easy. We have seen this. We know, though, that since we are changing state, we need to initialize our state in the constructor.

Phew. Let's just write some code! We will write a method in the App component that receives a zipcode and saves it in it's own state.

onFormSubmit(zipcode) {
   this.setState({
      zipcode
   });
}
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75%

If a component, when used, contains child components or React nodes inside of the component (e.g., <Parent><Child /></Parent> or <Parent><span>test<span></Parent>) these React node or component instances can be accessed by using this.props.children.,It can be confusing at first to realize that children are not what a component returns, but instead what is contained inside of component anywhere (including in a render) it is instantiated.,Return the total number of components in children, equal to the number of times that a callback passed to map or forEach would be invoked.

Pretag
 Pretag team - issue, fix, solve, resolve
40%

When learning ReactJS, we often hear the term props. While it may sound confusing, props are nothing but objects which are used to pass data from one component to another. In this guide, we'll go through the React props in detail. We'll also look at how we can pass a props object from a child component to a parent component. ,Let's have a look at our example using a functional component where the props are received as arguments in the function signature, as shown below:,Most developers wonder about passing props from a child to a parent component when learning React. However, it’s not possible. Let's update the previous example with an additional Button component for toggling.

1import React, { Component } from 'react';
2class App extends Component {
3  render() {
4    const hello = 'Say Hello to learning Props/State in React!';
5    return (
6      <div>
7        <h1>{hello}</h1>
8      </div>
9    );
10  }
11}
12export default App;
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Pretty soon you will split out your first React component.,Before you have learned about React's children prop to pass a component as prop to another component.,In a functional stateless component, the props are received in the function signature as arguments:

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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Let’s try to pass “color” prop from the FancyBorder component to its children.,Let’s check the code for the React.Children + React.Context toggler implementation:,There are 2 Context.Consumers in the code: Toggler.Trigger and Toggler.Content that are implemented as static fields of the Toggler class.

Pretag
 Pretag team - issue, fix, solve, resolve
48%

Verifies that children has only one child (a React element) and returns it. Otherwise this method throws an error.,React.forwardRef creates a React component that forwards the ref attribute it receives to another component below in the tree. This technique is not very common but is particularly useful in two scenarios:,React.createRef creates a ref that can be attached to React elements via the ref attribute.

class Greeting extends React.Component {
  render() {
    return <h1>Hello, {this.props.name}</h1>;
  }
}
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