Rendering json data with axios

问题:

I'm trying to get data from .json file. Nothing appears on the page. Maybe somebody have an idea why? Thanks! This is link on the file https://s3-us-west-2.amazonaws.com/digicode-interview/Q1.json

import React from 'react';
import createReactClass from 'create-react-class';
import ReactDOM from 'react-dom';
import axios from 'axios';


class Data extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      array: []
    };
  }

  componentDidMount(){
    axios
      .get('https://crossorigin.me/https://s3-us-west-2.amazonaws.com/digicode-interview/Q1.json')
      .then(({ data })=> {
        this.setState({ 
          array: data.recipes.Ingredients
        });
      })
      .catch((err)=> {})
  }

  render() {
    const child = this.state.array.map((element, index) => {
      return <div key={index}>
        <p>{ element.data.name }</p>
      </div>
    });

    return <div><div>{ child }</div></div>;
  }
}

export default Data;

回答1:

Here's my answer to the exercise given. I would like to share this, since you have tried that out. There may be different ways of doing this. Follow your own way. Here's how I did it.

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import axios from 'axios';
import _ from 'lodash';

class Data extends Component {
  constructor(props) {
   super(props);

   this.state = {
     array: []
   };

   this.renderRecipes = this.renderRecipes.bind(this);
 }

 componentDidMount(){
   axios
     .get('https://s3-us-west-2.amazonaws.com/digicode-interview/Q1.json')
     .then(({ data })=> {
       console.log(data);
       this.setState(
         { array: data.recipes }
       );
     })
     .catch((err)=> {})
 }

 render() {
   console.log(this.state.array);
   return(
     <div>
       <h3>Recipes</h3>
       <ul className="list-group">
          {this.renderRecipes()}
       </ul>
     </div>
   );
 }

 renderRecipes() {
   console.log(this.state.array);
   return _.map(this.state.array, recipe => {
     return (
       <li className="list-group-item" key={recipe.name}>
           {recipe.name}
           <ul className="list-group">
              Ingredients:
              {this.renderIngredients(recipe)}
           </ul>
       </li>
     );
   });
 }

 renderIngredients(recipe) {
    return _.map(recipe.Ingredients, ingredient => {
        return (
          <li className="list-group-item" key={ingredient.name}>
              <p>Name: {ingredient.name}, Amount: {ingredient.amount}</p>
          </li>
        );
    });
 }
}

export default Data;

回答2:

Here I have fixed it. You have updated the code so I can't remember the initial one now. I think the issue is in your render method. With this code you can list down all the recipe names in your browser.

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import axios from 'axios';
import _ from 'lodash';

class Data extends Component {
  constructor(props) {
   super(props);

   this.state = {
     array: []
   };

   this.renderRecipes = this.renderRecipes.bind(this);
 }

 componentDidMount(){
   axios
     .get('https://crossorigin.me/https://s3-us-west-2.amazonaws.com/digicode-interview/Q1.json')
     .then(({ data })=> {
       console.log(data);
       this.setState(
         { array: data.recipes }
       );
     })
     .catch((err)=> {})
 }

 render() {
   console.log(this.state.array);
   return(
     <div>
       <h3>Recipes</h3>
       <ul className="list-group">
          {this.renderRecipes()}
       </ul>
     </div>
   );
 }

 renderRecipes() {
   console.log(this.state.array);
   return _.map(this.state.array, recipe => {
     return (
       <li className="list-group-item" key={recipe.name}>
           {recipe.name}
       </li>
     );
   });
 }
}

export default Data;

I would like to leave one exercise for you.

Exercise Change this code so that you can list down all the Ingredients for each recipe. Here I have listed all the recipe names. You just need to add Ingredients for each recipe and put them together. This will help you to improve your knowledge in React landscape.

Hope this helps. Happy coding !