{"id":5352,"date":"2022-11-19T09:52:33","date_gmt":"2022-11-19T14:52:33","guid":{"rendered":"https:\/\/www.cloudsurph.com\/?p=5352"},"modified":"2022-11-26T08:08:10","modified_gmt":"2022-11-26T13:08:10","slug":"reactjs-how-to-use-lists-and-keys-in-react","status":"publish","type":"post","link":"https:\/\/www.cloudsurph.com\/reactjs-how-to-use-lists-and-keys-in-react\/","title":{"rendered":"ReactJS: How to use Lists and Keys in React"},"content":{"rendered":"

In this article, we can try to define ReactJS: how to use Lists and Keys, react Lists and Keys, and how can we use Lists and Keys in react.<\/p>\n

Basic List Component<\/h3>\n

Usually, we would render lists inside a component. We can refactor the example of the previous article into a component that accepts an array of numbers and outputs a list of elements.<\/p>\n

function NumberList(props) {\r\n\u00a0 const numbers = props.numbers;\r\n\u00a0 const listItems = numbers.map((number) =>\r\n\u00a0 \u00a0 <li>{number}<\/li>\r\n\u00a0 );\r\n\u00a0 return (\r\n\u00a0 \u00a0 <ul>{listItems}<\/ul>\r\n\u00a0 );\r\n}\r\nconst numbers = [1, 2, 3, 4, 5];\r\nconst root = ReactDOM.createRoot(document.getElementById('root'));\r\nroot.render(<NumberList numbers={numbers} \/>);\r\n<\/pre>\n
In this case, when you run this code, you\u2019ll be given a warning that a key should be provided for list items.<\/p>\n
Also, a \u201ckey<\/strong>\u201d is a special string attribute we need to include when creating lists of elements.<\/p>\n
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So, let\u2019s assign a key to our list of items inside numbers.map()<\/strong> and fix the missing key issue like the below example.<\/p>\n
function NumberList(props) {\r\nconst numbers = props.numbers;\r\nconst listItems = numbers.map((number) =>\r\n<li key={number.toString()}>\r\n{number}\r\n<\/li>\r\n);\r\nreturn (\r\n<ul>{listItems}<\/ul>\r\n);\r\n}\r\n<\/pre>\n
Keys<\/h3>\n
Here, Keys help React identity which items have changed, are removed, or are added. Also, Keys should be given to the elements inside the array to give the elements a stable identity like the below example:<\/p>\n
const numbers = [1, 2, 3, 4, 5];\r\nconst listItems = numbers.map((number) =>\r\n<li key={number.toString()}>\r\n{number}\r\n<\/li>\r\n);\r\n<\/pre>\n
The best way the pick a key is to use a string that uniquely identifies a list item among its siblings and most often you would use IDs from your data as keys like the below example:<\/p>\n
const todoItems = todos.map((todo) =>\r\n<li key={todo.id}>\r\n{todo.text}\r\n<\/li>\r\n);\r\n<\/pre>\n
Now, when you don\u2019t have stable IDs for rendered items, you may use the item index as a key as a last resort like the below example:<\/p>\n
const todoItems = todos.map((todo, index) =>\r\n\/\/ Only do this if items have no stable IDs\r\n<li key={index}>\r\n{todo.text}\r\n<\/li>\r\n);\r\n<\/pre>\n
You can visit for the explanation about why keys are necessary<\/a> if you\u2019re interested in learning more.<\/p>\n
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Extracting Components with Keys<\/h3>\n
The Keys only make sense in the context of the surrounding array.<\/p>\n
For like, if you extract<\/a><\/strong> a ListItem<\/strong> component, you should keep the key on the <ListItem \/><\/strong> elements in the array rather than on the <li><\/strong> element in the ListItem<\/strong> itself.<\/p>\n
Incorrect Key Usage example below:<\/strong><\/h4>\n
function ListItem(props) {\r\n\u00a0 const value = props.value;\r\n\u00a0 return (\r\n\u00a0 \u00a0 \/\/ Wrong! There is no need to specify the key here:\r\n\u00a0 \u00a0 <li key={value.toString()}>\r\n\u00a0 \u00a0 \u00a0 {value}\r\n\u00a0 \u00a0 <\/li>\r\n\u00a0 );\r\n}\r\nfunction NumberList(props) {\r\n\u00a0 const numbers = props.numbers;\r\n\u00a0 const listItems = numbers.map((number) =>\r\n\u00a0 \u00a0 \/\/ Wrong! The key should have been specified here:\r\n\u00a0 \u00a0 <ListItem value={number} \/>\r\n\u00a0 );\r\n\u00a0 return (\r\n\u00a0 \u00a0 <ul>\r\n\u00a0 \u00a0 \u00a0 {listItems}\r\n\u00a0 \u00a0 <\/ul>\r\n\u00a0 );\r\n}\r\n<\/pre>\n
Correct Key Usage example below:<\/strong><\/h4>\n
function ListItem(props) {\r\n\u00a0 \/\/ Correct! There is no need to specify the key here:\r\n\u00a0 return <li>{props.value}<\/li>;\r\n}\r\nfunction NumberList(props) {\r\n\u00a0 const numbers = props.numbers;\r\n\u00a0 const listItems = numbers.map((number) =>\r\n\u00a0 \u00a0 \/\/ Correct! Key should be specified inside the array.\r\n\u00a0 \u00a0 <ListItem key={number.toString()} value={number} \/>\r\n\u00a0 );\r\n\u00a0 return (\r\n\u00a0 \u00a0 <ul>\r\n\u00a0 \u00a0 \u00a0 {listItems}\r\n \u00a0 <\/ul>\r\n\u00a0 );\r\n}\r\n<\/pre>\n
Keys Must Only Be Unique Among Siblings<\/h3>\n
Here the Keys used within arrays should be unique among their siblings.<\/p>\n
However, they don\u2019t need to be globally unique and we can use the same keys when we produce two different arrays like the below example:<\/p>\n
function Blog(props) {\r\n\u00a0 const sidebar = (\r\n\u00a0 \u00a0 <ul>\r\n\u00a0 \u00a0 \u00a0 {props.posts.map((post) =>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <li key={post.id}>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 {post.title}\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/li>\r\n\u00a0 \u00a0 \u00a0 )}\r\n\u00a0 \u00a0 <\/ul>\r\n\u00a0 );\r\n\u00a0 const content = props.posts.map((post) =>\r\n\u00a0 \u00a0 <div key={post.id}>\r\n\u00a0 \u00a0 \u00a0 <h3>{post.title}<\/h3>\r\n\u00a0 \u00a0 \u00a0 <p>{post.content}<\/p>\r\n\u00a0 \u00a0 <\/div>\r\n\u00a0 );\r\n\u00a0 return (\r\n\u00a0 \u00a0 <div>\r\n\u00a0 \u00a0 \u00a0 {sidebar}\r\n\u00a0 \u00a0 \u00a0 <hr \/>\r\n\u00a0 \u00a0 \u00a0 {content}\r\n\u00a0 \u00a0 <\/div>\r\n\u00a0 );\r\n}\r\nconst posts = [\r\n\u00a0 {id: 1, title: 'Hello World', content: 'Welcome to learning React!'},\r\n\u00a0 {id: 2, title: 'Installation', content: 'You can install React from npm.'}\r\n];\r\n;\r\nconst root = ReactDOM.createRoot(document.getElementById('root'));\r\nroot.render(<Blog posts={posts} \/>);\r\n<\/pre>\n
So, If you need the same value in your component, it pass explicitly as a prop with a different name.<\/p>\n
As in the below example:<\/p>\n
const content = posts.map((post) =>\r\n<Post\r\nkey={post.id}\r\nid={post.id}\r\ntitle={post.title} \/>\r\n);\r\n<\/pre>\n
Embedding map() in JSX<\/h3>\n
function NumberList(props) { const numbers = props.numbers; const listItems = numbers.map((number) => <ListItem key={number.toString()} value={number} \/> ); return ( <ul> {listItems} <\/ul> ); }\r\n<\/pre>\n
JSX allows embedding any expression in curly braces so we could inline the map()<\/strong> result:<\/h5>\n
function NumberList(props) {\r\nconst numbers = props.numbers;\r\nreturn (\r\n<ul>\r\n{numbers.map((number) =>\r\n<ListItem key={number.toString()}\r\nvalue={number} \/>\r\n)}\r\n<\/ul>\r\n);\r\n}\r\n<\/pre>\n
If you enjoyed reading this article and have more questions please reach out to our\u00a0support team<\/a>\u00a0via live chat or\u00a0email<\/a>\u00a0and we would be glad to help you. we provide server\u00a0hosting<\/a>\u00a0for all types of need and we can even get your\u00a0server<\/a>\u00a0up and running with the service of your choice.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, we can try to define ReactJS: how to use Lists and Keys, react Lists and Keys, and how can we use Lists and Keys in react. Basic List Component Usually, we would render lists inside a component. We can refactor the example of the previous article into a component that accepts an […]<\/p>\n","protected":false},"author":8,"featured_media":5353,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[157,25,158,159,151,44,1],"tags":[54,47,105,103,48,113],"class_list":["post-5352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-centos-7","category-web-hosting-virtualization","category-linux-basics","category-linux-server","category-react-js","category-kvm-xen","category-virtual-private-servers","tag-best-vps-hosting-server-maryland","tag-cheap-cloud-servers","tag-cheap-storage-server-hosting","tag-cheapest-vps","tag-dedicated-server-hosting-in-washington-d-c","tag-speed-test-vps"],"yoast_head":"\nhow to use Lists and Keys in ReactJS<\/title>\n<meta name=\"description\" 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