Want to display different list of items when clicking on a category? I believe I have a working version for you. I changed some syntax and variable/prop names for clarity and added comments explaining changes.
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const React = require('react'); const ReactDOM = require('react-dom'); const axios = require('axios'); // These should probably be imported from a constants.js file const CATEGORIES_ENDPOINT = 'https://api.gousto.co.uk/products/v2.0/categories'; const PRODUCTS_ENDPOINT = 'https://api.gousto.co.uk/products/v2.0/products?includes[]=categories&includes[]=attributes&sort=position&image_sizes[]=365&image_sizes[]=400&period_id=120'; const NavContainer = React.createClass({ // All your state lives in your topmost container and is // passed down to any component that needs it getInitialState() { return { categories: [], items: [], selectedCategoryId: null } }, // Generic method that's used to set a selectedCategoryId // Can now be passed into any component that needs to select a category // without needing to worry about dealing with events and whatnot selectCategory(category) { this.setState({ selectedCategoryId: category }); }, componentDidMount() { this.serverRequest = axios.all([ axios.get(CATEGORIES_ENDPOINT), axios.get(PRODUCTS_ENDPOINT) ]) .then(axios.spread((categoriesResponse, itemsResponse) => { console.log('Categories', categoriesResponse.data.data); console.log('Item', itemsResponse.data.data); // This `this` should work due to ES6 arrow functions this.setState({ categories: categoriesResponse.data.data, items : itemsResponse.data.data }); })); }, componentWillUnmount() { this.serverRequest.abort(); }, render() { // ABD: Always Be Destructuring const { categories, items, selectedCategoryId } = this.state; return ( <div className="navigation"> <h1> Store Cupboard </h1> <NavigationCategoryList categories={categories} // Pass the select function into the category list // so the category items can call it when clicked selectCategory={this.selectCategory} /> <NavigationSubCategoryList items={items} // Pass the selected category into the list of items // to be used for filtering the list selectedCategoryId={selectedCategoryId} /> </div> ); } }); const NavigationCategory = React.createClass({ // Prevent natural browser navigation and // run `selectCategory` passed down from parent // with the id passed down from props // No querying DOM for info! when props have the info we need handleClick(e) { const { id, selectCategory } = this.props; // Handle the event here instead of all the way at the top // You might want to do other things as a result of the click // Like maybe: // Logger.logEvent('Selected category', id); e.preventDefault(); selectCategory(id); }, render() { const { id, title } = this.props; return ( <div className="navigationLink"> <a href={id} onClick={this.handleClick}> {title} </a> </div> ); } }); const NavigationCategoryList = React.createClass({ // If you put your mapping method out here, it'll only // get instantiated once when the component mounts // rather than being redefined every time there's a rerender renderCategories() { const { selectCategory, categories } = this.props; return categories.map(category => { const { id, title } = category; return ( <NavigationCategory // Every time you have a list you need a key prop key={id} title={title} id={id} selectCategory={selectCategory} /> ); }); }, render() { return ( <div> <div className="navigationCategory"> {this.renderCategories()} </div> </div> ); } }); const NavigationSubCategoryLink = React.createClass({ render() { const { name } = this.props; return ( <div className="navigationSubCategory" id={name}> {name} </div> ); } }); const NavigationSubCategoryList = React.createClass({ renderSubCategories() { const { selectedCategoryId, items } = this.props; // This is the key to filtering based on selectedCategoryId return items.filter(item => { // Checking all the categories in the item's categories array // against the selectedCategoryId passed in from props return item.categories.some(category => { return category.id === selectedCategoryId; }); }) // After filtering what you need, map through // the new, shorter array and render each item .map(item => { const { title, link, id } = item; return ( <NavigationSubCategoryLink key={id} name={title} link={link} /> ); }); }, render() { return ( <div className="subCategoryContainer"> {this.renderSubCategories()} </div> ); } }); ReactDOM.render(<NavContainer />, document.getElementById('app')); |
The two key parts for filtering here are the .filter() and .some() methods on arrays.
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return items.filter(item => { return item.categories.some(category => { return category.id === selectedCategoryId; }); }) |
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