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>
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Shaun Hamilton
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---
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id: 5a24c314108439a4d4036179
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title: 创建一个可以控制的表单
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challengeType: 6
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forumTopicId: 301384
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dashedName: create-a-controlled-form
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---
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# --description--
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上一个挑战展示了 React 能控制某些元素的内部 state，比如 `input` 和 `textarea`，这使得这些元素成为受控组件。 这也适用于其他表单元素，包括常规的 HTML 表单 `form` 元素。
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# --instructions--
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`MyForm` 组件中是一个带有提交处理程序的空 `form` 元素， 提交处理程序将在提交表单时被调用。
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我们增加了一个提交表单的按钮。 可以看到它的 `type` 被设置为 `submit`，表明它是控制表单提交的按钮。 在 `form` 中添加 `input` 元素，并像上个挑战一样设置其 `value` 和 `onChange()` 属性。 然后，应该完成 `handleSubmit` 方法，以便将组件 state 属性 `submit` 设置为本地 `state` 下的当前输入值。
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**注意：** 还必须在提交处理程序中调用 `event.preventDefault()`，以防止将会刷新网页的默认的表单提交行为。 为了便于学员操作，默认行为在这里被禁用，以防止重置挑战的代码。
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最后，在 `form` 元素之后创建一个 `h1` 标签，该标签从组件的 `state` 渲染 `submit` 的值。 然后，可以在表单中键入任何内容，然后单击按钮（或按 enter 键），输入会渲染到页面上。
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# --hints--
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`MyForm` 应该返回一个包含 `form` 和 `h1` 标签的 `div` 元素， 其中，表单中应该包括一个 `input` 和一个 `button`。
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```js
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assert(
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(() => {
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const mockedComponent = Enzyme.mount(React.createElement(MyForm));
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return (
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mockedComponent.find('div').children().find('form').length === 1 &&
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mockedComponent.find('div').children().find('h1').length === 1 &&
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mockedComponent.find('form').children().find('input').length === 1 &&
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mockedComponent.find('form').children().find('button').length === 1
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);
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})()
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);
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```
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`MyForm` 的 state 应该用 `input` 和 `submit` 属性初始化，且两者都为空字符串。
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```js
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assert(
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Enzyme.mount(React.createElement(MyForm)).state('input') === '' &&
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Enzyme.mount(React.createElement(MyForm)).state('submit') === ''
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);
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```
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`input` 元素中的输入应该会更新组件中 state 的 `input` 属性。
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```js
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(() => {
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const mockedComponent = Enzyme.mount(React.createElement(MyForm));
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const _1 = () => {
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mockedComponent.setState({ input: '' });
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return mockedComponent.state('input');
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};
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const _2 = () => {
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mockedComponent
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.find('input')
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.simulate('change', { target: { value: 'TestInput' } });
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return {
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state: mockedComponent.state('input'),
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inputVal: mockedComponent.find('input').props().value
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};
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};
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const before = _1();
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const after = _2();
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assert(
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before === '' &&
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after.state === 'TestInput' &&
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after.inputVal === 'TestInput'
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);
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})();
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```
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提交表单应该运行 `handleSubmit`，它应该将 state 中的 `submit` 属性设置为当前输入。
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```js
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(() => {
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const mockedComponent = Enzyme.mount(React.createElement(MyForm));
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const _1 = () => {
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mockedComponent.setState({ input: '' });
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mockedComponent.setState({ submit: '' });
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mockedComponent
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.find('input')
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.simulate('change', { target: { value: 'SubmitInput' } });
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return mockedComponent.state('submit');
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};
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const _2 = () => {
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mockedComponent.find('form').simulate('submit');
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return mockedComponent.state('submit');
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};
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const before = _1();
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const after = _2();
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assert(before === '' && after === 'SubmitInput');
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})();
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```
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`handleSubmit` 应该调用 `event.preventDefault`。
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```js
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assert(
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__helpers.isCalledWithNoArgs(
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'event.preventDefault',
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MyForm.prototype.handleSubmit.toString()
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)
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);
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```
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`h1` 标头应该从组件的 state 渲染 `submit` 字段的值。
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```js
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(() => {
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const mockedComponent = Enzyme.mount(React.createElement(MyForm));
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const _1 = () => {
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mockedComponent.setState({ input: '' });
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mockedComponent.setState({ submit: '' });
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mockedComponent
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.find('input')
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.simulate('change', { target: { value: 'TestInput' } });
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return mockedComponent.find('h1').text();
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};
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const _2 = () => {
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mockedComponent.find('form').simulate('submit');
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return mockedComponent.find('h1').text();
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};
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const before = _1();
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const after = _2();
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assert(before === '' && after === 'TestInput');
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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(<MyForm />, document.getElementById('root'));
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```
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## --seed-contents--
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```jsx
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class MyForm 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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input: '',
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submit: ''
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};
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this.handleChange = this.handleChange.bind(this);
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this.handleSubmit = this.handleSubmit.bind(this);
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}
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handleChange(event) {
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this.setState({
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input: event.target.value
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});
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}
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handleSubmit(event) {
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// Change code below this line
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// Change code above this line
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}
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render() {
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return (
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<div>
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<form onSubmit={this.handleSubmit}>
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{/* Change code below this line */}
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{/* Change code above this line */}
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<button type='submit'>Submit!</button>
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</form>
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{/* Change code below this line */}
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{/* Change code above this line */}
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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 MyForm 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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input: '',
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submit: ''
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};
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this.handleChange = this.handleChange.bind(this);
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this.handleSubmit = this.handleSubmit.bind(this);
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}
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handleChange(event) {
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this.setState({
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input: event.target.value
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});
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}
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handleSubmit(event) {
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event.preventDefault();
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this.setState(state => ({
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submit: state.input
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}));
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}
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render() {
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return (
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<div>
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<form onSubmit={this.handleSubmit}>
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<input value={this.state.input} onChange={this.handleChange} />
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<button type='submit'>Submit!</button>
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</form>
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<h1>{this.state.submit}</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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