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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---
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id: 5a24c314108439a4d4036179
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title: Create a Controlled Form
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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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The last challenge showed that React can control the internal state for certain elements like `input` and `textarea`, which makes them controlled components. This applies to other form elements as well, including the regular HTML `form` element.
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# --instructions--
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The `MyForm` component is set up with an empty `form` with a submit handler. The submit handler will be called when the form is submitted.
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We've added a button which submits the form. You can see it has the `type` set to `submit` indicating it is the button controlling the form. Add the `input` element in the `form` and set its `value` and `onChange()` attributes like the last challenge. You should then complete the `handleSubmit` method so that it sets the component state property `submit` to the current input value in the local `state`.
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**Note:** You also must call `event.preventDefault()` in the submit handler, to prevent the default form submit behavior which will refresh the web page. For camper convenience, the default behavior has been disabled here to prevent refreshes from resetting challenge code.
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Finally, create an `h1` tag after the `form` which renders the `submit` value from the component's `state`. You can then type in the form and click the button (or press enter), and you should see your input rendered to the page.
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# --hints--
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`MyForm` should return a `div` element which contains a `form` and an `h1` tag. The form should include an `input` and a `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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The state of `MyForm` should initialize with `input` and `submit` properties, both set to empty strings.
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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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Typing in the `input` element should update the `input` property of the component's state.
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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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Submitting the form should run `handleSubmit` which should set the `submit` property in state equal to the current input.
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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` should call `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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The `h1` header should render the value of the `submit` field from the component's state.
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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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Reference in New Issue
Block a user