Files
freeCodeCamp/curriculum/challenges/portuguese/03-front-end-development-libraries/react/render-state-in-the-user-interface-another-way.md
Shaun Hamilton c2a11ad00d feat: add 'back/front end' in curriculum (#42596)
* chore: rename APIs and Microservices to include "Backend" (#42515)

* fix typo

* fix typo

* undo change

* Corrected grammar mistake

Corrected a grammar mistake by removing a comma.

* change APIs and Microservices cert title

* update title

* Change APIs and Microservices certi title

* Update translations.json

* update title

* feat(curriculum): rename apis and microservices cert

* rename folder structure

* rename certificate

* rename learn Markdown

* apis-and-microservices -> back-end-development-and-apis

* update backend meta

* update i18n langs and cypress test

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* fix: add development to front-end libraries (#42512)

* fix: added-the-word-Development-to-front-end-libraries

* fix/added-the-word-Development-to-front-end-libraries

* fix/added-word-development-to-front-end-libraries-in-other-related-files

* fix/added-the-word-Development-to-front-end-and-all-related-files

* fix/removed-typos-from-last-commit-in-index.md

* fix/reverted-changes-that-i-made-to-dependecies

* fix/removed xvfg

* fix/reverted changes that i made to package.json

* remove unwanted changes

* front-end-development-libraries changes

* rename backend certSlug and README

* update i18n folder names and keys

* test: add legacy path redirect tests

This uses serve.json from the client-config repo, since we currently use
that in production

* fix: create public dir before moving serve.json

* fix: add missing script

* refactor: collect redirect tests

* test: convert to cy.location for stricter tests

* rename certificate folder to 00-certificates

* change crowdin config to recognise new certificates location

* allow translations to be used

Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>

* add forwards slashes to path redirects

* fix cypress path tests again

* plese cypress

* fix: test different challenge

Okay so I literally have no idea why this one particular challenge
fails in Cypress Firefox ONLY. Tom and I paired and spun a full build
instance and confirmed in Firefox the page loads and redirects as
expected. Changing to another bootstrap challenge passes Cypress firefox
locally. Absolutely boggled by this.

AAAAAAAAAAAAAAA

* fix: separate the test

Okay apparently the test does not work unless we separate it into
a different `it` statement.

>:( >:( >:( >:(

Co-authored-by: Sujal Gupta <55016909+heysujal@users.noreply.github.com>
Co-authored-by: Noor Fakhry <65724923+NoorFakhry@users.noreply.github.com>
Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
2021-08-13 21:57:13 -05:00

3.1 KiB

id, title, challengeType, forumTopicId, dashedName
id title challengeType forumTopicId dashedName
5a24c314108439a4d4036172 Renderizar estado na interface de usuário de outra forma 6 301408 render-state-in-the-user-interface-another-way

--description--

Há outra forma de acessar o state em um componente. No método render(), antes da instrução return, você pode escrever JavaScript diretamente. Por exemplo, você poderia declarar funções, acessar dados de state ou props, executar computações nesses dados, entre outras coisas. Em seguida, você pode atribuir quaisquer dados para variáveis, que você tem acesso na instrução return.

--instructions--

No método de renderização do MyComponent, defina uma const chamada name e defina-a igual ao valor do nome no state do componente. Como você pode escrever JavaScript diretamente nesta parte do código, você não precisa incluir essa referência em chaves.

Em seguida, na instrução return, renderize este valor em uma tag h1 usando a variável name. Lembre-se, você precisa usar a sintaxe JSX (chaves para JavaScript) na instrução de retorno.

--hints--

MyComponent deve ter uma chave name com o valor freeCodeCamp armazenado no seu state.

assert(
  Enzyme.mount(React.createElement(MyComponent)).state('name') ===
    'freeCodeCamp'
);

MyComponent deve renderizar um título h1 que está dentro de um único div.

assert(
  /<div><h1>.*<\/h1><\/div>/.test(
    Enzyme.mount(React.createElement(MyComponent)).html()
  )
);

A tag h1 renderizada deve ter uma referência a {name}.

(getUserInput) =>
  assert(/<h1>\n*\s*\{\s*name\s*\}\s*\n*<\/h1>/.test(getUserInput('index')));

O título h1 renderizado deve conter apenas texto renderizado do estado do componente.

async () => {
  const waitForIt = (fn) =>
    new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250));
  const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
  const first = () => {
    mockedComponent.setState({ name: 'TestName' });
    return waitForIt(() => mockedComponent.html());
  };
  const firstValue = await first();
  assert(firstValue === '<div><h1>TestName</h1></div>');
};

--seed--

--after-user-code--

ReactDOM.render(<MyComponent />, document.getElementById('root'))

--seed-contents--

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: 'freeCodeCamp'
    }
  }
  render() {
    // Change code below this line

    // Change code above this line
    return (
      <div>
        { /* Change code below this line */ }

        { /* Change code above this line */ }
      </div>
    );
  }
};

--solutions--

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: 'freeCodeCamp'
    }
  }
  render() {
    // Change code below this line
    const name = this.state.name;
    // Change code above this line
    return (
      <div>
        { /* Change code below this line */ }
        <h1>{name}</h1>
        { /* Change code above this line */ }
      </div>
    );
  }
};