* 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>
156 lines
4.2 KiB
Markdown
156 lines
4.2 KiB
Markdown
---
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id: 5a24c314108439a4d4036184
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title: Renderizar com uma condição if-else
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challengeType: 6
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forumTopicId: 301410
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dashedName: render-with-an-if-else-condition
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---
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# --description--
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Outra aplicação de usar JavaScript para controlar sua visão renderizada é associar os elementos que são renderizados em uma condição. Quando a condição é verdadeira, uma visão renderiza. Quando é falso, é uma visão diferente. Você pode fazer isso com uma instrução padrão `if/else` no método `render()` de um componente React.
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# --instructions--
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MyComponent contém um `boolean` em seu estado que rastreia se você deseja exibir algum elemento na interface do usuário ou não. O `button` alterna o estado deste valor. No momento, ele renderiza a mesma interface do usuário todas as vezes. Reescreva o método `render()` com uma instrução `if/else` para que se `display` for `true`, você retorna a marcação atual. Caso contrário, retorne a marcação sem o elemento `h1`.
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**Observação:** você deve escrever um `if/else` para passar nos testes. O uso do operador ternário não passará aqui.
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# --hints--
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`MyComponent` deve existir e renderizar.
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```js
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assert(
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(function () {
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const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
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return mockedComponent.find('MyComponent').length === 1;
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})()
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);
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```
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Quando `display` é definido como `true`, uma `div`, um `button`, e um `h1` devem renderizar.
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```js
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async () => {
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const waitForIt = (fn) =>
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new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250));
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const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
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const state_1 = () => {
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mockedComponent.setState({ display: true });
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return waitForIt(() => mockedComponent);
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};
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const updated = await state_1();
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assert(
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mockedComponent.find('div').length === 1 &&
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mockedComponent.find('div').children().length === 2 &&
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mockedComponent.find('button').length === 1 &&
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mockedComponent.find('h1').length === 1
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);
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};
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```
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Quando `display` é definido como `false`, apenas uma `div` e um `button` devem renderizar.
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```js
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async () => {
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const waitForIt = (fn) =>
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new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250));
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const mockedComponent = Enzyme.mount(React.createElement(MyComponent));
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const state_1 = () => {
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mockedComponent.setState({ display: false });
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return waitForIt(() => mockedComponent);
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};
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const updated = await state_1();
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assert(
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mockedComponent.find('div').length === 1 &&
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mockedComponent.find('div').children().length === 1 &&
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mockedComponent.find('button').length === 1 &&
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mockedComponent.find('h1').length === 0
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);
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};
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```
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O método de renderização deve usar um comando `if/else` para verificar a condição de `this.state.display`.
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```js
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(getUserInput) =>
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assert(
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getUserInput('index').includes('if') &&
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getUserInput('index').includes('else')
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);
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```
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# --seed--
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## --after-user-code--
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```jsx
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ReactDOM.render(<MyComponent />, document.getElementById('root'))
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```
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## --seed-contents--
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```jsx
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class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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display: true
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}
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this.toggleDisplay = this.toggleDisplay.bind(this);
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}
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toggleDisplay() {
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this.setState((state) => ({
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display: !state.display
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}));
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}
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render() {
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// Change code below this line
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return (
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<div>
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<button onClick={this.toggleDisplay}>Toggle Display</button>
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<h1>Displayed!</h1>
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</div>
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);
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}
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};
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```
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# --solutions--
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```jsx
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class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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display: true
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}
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this.toggleDisplay = this.toggleDisplay.bind(this);
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}
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toggleDisplay() {
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this.setState((state) => ({
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display: !state.display
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}));
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}
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render() {
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// Change code below this line
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if (this.state.display) {
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return (
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<div>
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<button onClick={this.toggleDisplay}>Toggle Display</button>
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<h1>Displayed!</h1>
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</div>
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);
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} else {
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return (
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<div>
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<button onClick={this.toggleDisplay}>Toggle Display</button>
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</div>
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);
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}
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}
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};
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```
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