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Forms with React Radoslav Stankov 07/03/2017

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Radoslav Stankov @rstankov http://rstankov.com http://github.com/rstankov

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! https://github.com/tannerlinsley/react-form " https://github.com/prometheusresearch/react-forms # https://github.com/codecks-io/react-reform $ https://github.com/erikras/redux-form % https://github.com/Semantic-Org/Semantic-UI-React Libraries

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export default class SubmissionForm extends React.Component { render() { return (

Speaker

Name:
Email:
); } }

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export default class SubmissionForm extends React.Component { render() { return (

Speaker

Name:
Email:
); } handleSubmit = (e) => { e.preventDefault(); const allValues = Array.from(e.target.elements).reduce((data, input) => { console.log(input); data[input.name] = input.value; return data; }, {}); remoteCall({ speakerName: allValues.speakerName, speakerEmail: allValues.speakerEmail, }); }; }

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export default class SubmissionForm extends React.Component { render() { return (

Speaker

Name: this.speakerName = ref} type="text" id="speakerName" name="speakerName" defaultV
Email: this.speakerEmail = ref} type="email" id="speakerEmail" name="speakerEmail" defa
); } handleSubmit = (e) => { e.preventDefault(); remoteCall({ speakerName: this.speakerName.value, speakerEmail: this.speakerEmail.value, }); }; }

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export default class SubmissionForm extends React.Component { render() { return (

Speaker

Name: this.speakerName = ref} type="text" id="speakerName" name="speakerName" defaultV
Email: this.speakerEmail = ref} type="email" id="speakerEmail" name="speakerEmail" defa
); } handleSubmit = (e) => { e.preventDefault(); remoteCall({ speakerName: this.speakerName.value, speakerEmail: this.speakerEmail.value, }); }; }

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export default class SubmissionForm extends React.Component { render() { return (

Speaker

Name: this.speakerName = ref} type="text" id="speakerName" name="speakerName" defaultV
Email: this.speakerEmail = ref} type="email" id="speakerEmail" name="speakerEmail" defa
); } handleSubmit = (e) => { e.preventDefault(); remoteCall({ speakerName: this.speakerName.value, speakerEmail: this.speakerEmail.value, }); }; } &

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Uncontrolled Components • fast • simple • integration with external libraries • no much control • gets messy quite easy

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Controlled Components • you have more control • easier to reason about • needed for complex form interactions • recommend by react documentation

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class ExampleForm extends React.Component { state = { value: '' } handleChange = (event) => { this.setState({value: event.target.value}); } handleSubmit = (event) => { e.preventDefault(); remoteCall(this.target.value)/ }; render() { return ( ); } }

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class ExampleForm extends React.Component { state = { value: '' } handleChange = (event) => { this.setState({value: event.target.value}); } handleSubmit = (event) => { e.preventDefault(); remoteCall(this.target.value)/ }; render() { return ( ); } } Input change

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class ExampleForm extends React.Component { state = { value: '' } handleChange = (event) => { this.setState({value: event.target.value}); } handleSubmit = (event) => { e.preventDefault(); remoteCall(this.target.value)/ }; render() { return ( ); } } Input change 
 handleChange setState

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class ExampleForm extends React.Component { state = { value: '' } handleChange = (event) => { this.setState({value: event.target.value}); } handleSubmit = (event) => { e.preventDefault(); remoteCall(this.target.value)/ }; render() { return ( ); } } Input change 
 handleChange setState 
 render New value

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', }, }; render() { return (

Speaker

Name: Email: ); } handleChange = (e) => { const name = e.target.name; const value = e.target.value; this.setState({ fields: {
 ...this.state.fields, [name]: value } }); }; handleSubmit = (e) => { e.preventDefault(); remoteCall(this.state.fields); }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', }, isSumitting: false, }; render() { return (

Speaker

Name: Email: ); } handleChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await remoteCall(this.state.fields); }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', }, isSumitting: false, }; render() { return (

Speaker

Name: Email: ); } handleChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await remoteCall(this.state.fields); }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', }, isSumitting: false, }; render() { return (

Speaker

Name: Email: Title: ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', }, isSumitting: false, }; render() { return (

Speaker

Name: Email: Title: ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', }, isSumitting: false, }; render() { return (

Speaker

Name: Email: Title: ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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let Field = ({ name, type, label, ...props }) => { return (
{label}:
); };

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export default class SubmissionForm extends React.Component { state = { /* … */ }; render() { return (

Speaker

Talk ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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export default class SubmissionForm extends React.Component { state = { /* … */ }; render() { return (

Speaker

Talk ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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let Field = ({ name, input, label, ...props }) => { if (input === 'textarea') { return (
{label}: </div> ); } return ( <div> <label htmlFor={name}>{label}: </label> <input type={input || 'text'} id={name} name={name} {...props} /> </div> ); };

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', }, isSumitting: false, }; render() { return (

Speaker

Talk ); } handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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const LENGTH_OPTIONS = [ {value: 15, label: '15 minutes'}, {value: 30, label: '30 minutes'}, {value: 45, label: '45 minutes'}, ];

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let Select = ({ options, ...props }) => ( {options.map(({ label, value }, i) => ( {label || value} ))} );

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let Field = ({ name, input, label, ...props }) => { if (input === 'textarea') { return (
{label}: </div> ); } if (input === 'select') { return ( <div> <label htmlFor={name}>{label}: </label> <Select id={name} name={name} {...props} /> </div> ); } return ( <div> <label htmlFor={name}>{label}: </label> <input type={input || 'text'} id={name} name={name} {...props} /> </div> ); };

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let Input = ({ ...props }) => ( );

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const INPUTS = { 'textarea': Textarea, 'select': Select, 'text': Input, }; let Field = ({ name, input = 'text', label, ...props }) => { const Component = INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}:
); };

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const INPUTS = { 'textarea': Textarea, 'select': Select, 'text': Input, }; let Field = ({ name, input = 'text', label, ...props }) => { const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}:
); };

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const INPUTS = { 'textarea': Textarea, 'select': Select, 'text': Input, }; let Field = ({ name, input = 'text', label, ...props }) => { const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}:
); };

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let RadioGroup = ({ value: fValue, options, name, id, ...props }) => (
    {options.map(({ label, value }, i) => (
  • {label || value}
    • ))}
);

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const INPUTS = { 'textarea': Textarea, 'select': Select, 'text': Input, 'radioGroup': RadioGroup, };

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Speaker

Talk

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Speaker

Talk

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Speaker

Talk

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Speaker

Talk

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 Component

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 Component Child Component

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 Component Child Component Child Child Component

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 Component Child Component Child Child Component 
 Child Child … Child Component

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 Component Child Component Child Child Component 
 Child Child … Child Component Context

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 Component Child Component Child Child Component 
 Child Child … Child Component Context Context

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }, isSumitting: false, }; static childContextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, }; getChildContext() { return { formState: this.state, formHandleChange: this.handleChange, }; } render() { /* … */ }; handleChange = (e) => { /* … */ }; handleSubmit = (e) => { /* … */ }; }

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let Field = ({ name, input, label, ...props }, { formState: { fields }, formHandleChange }) => { const value = fields[name]; const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}:
); }; Field.contextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, };

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let Field = ({ name, input, label, ...props }, { formState: { fields }, formHandleChange }) => { const value = fields[name]; const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}:
); }; Field.contextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, };

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Speaker

Talk

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Speaker

Talk

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let SubmitButton = ({ children }, { formState: { isSubmitting }}) => ( ); SubmitButton.contextTypes = { formState: React.PropTypes.object.isRequired, };

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Speaker

Talk

Submit

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }, isSumitting: false, }; static childContextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, }; getChildContext() { return { formState: this.state, formHandleChange: this.handleChange, }; } render() { return (

Speaker

Talk

Submit

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Speaker

Talk

Submit ); } handleChange = (e) => { const name = e.target.name; const value = e.target.value; const fields = { ...this.state.fields, [name]: value }; this.setState({ fields }); }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await remoteCall(this.state.fields); }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }, isSumitting: false, }; static childContextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, }; getChildContext() { return { formState: this.state, formHandleChange: this.handleChange, }; } render() { return (

Speaker

Talk

Submit ); } handleChange = (e) => { const name = e.target.name; const value = e.target.value; const fields = { ...this.state.fields, [name]: value }; this.setState({ fields }); }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await remoteCall(this.state.fields); }; }

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export default class SubmissionForm extends React.Component { state = { fields: { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }, isSumitting: false, }; static childContextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, }; getChildContext() { return { formState: this.state, formHandleChange: this.handleChange, }; } render() { return (

Speaker

Talk

Submit ); } handleChange = (e) => { const name = e.target.name; const value = e.target.value; const fields = { ...this.state.fields, [name]: value }; this.setState({ fields }); }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await remoteCall(this.state.fields); }; }

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class Form extends React.Component { state = { fields: this.props.fields, isSumitting: false, }; static childContextTypes = { formState: React.PropTypes.object.isRequired, formHandleChange: React.PropTypes.func.isRequired, }; getChildContext() { return { formState: this.state, formHandleChange: this.handleChange, }; } render() { return ( {this.props.children} ); } handleInputChange = (e) => { const name = e.target.name; const value = e.target.value; const fields = { ...this.state.fields, [name]: value }; this.setState({ fields }); };

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return { formState: this.state, formHandleChange: this.handleChange, }; } render() { return ( {this.props.children} ); } handleInputChange = (e) => { const name = e.target.name; const value = e.target.value; const fields = { ...this.state.fields, [name]: value }; this.setState({ fields }); }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true }); await this.props.onSubmit(this.state.fields); }; }

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const FIELDS = { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }; export default class SubmissionForm extends React.Component { render() { return (

Speaker

Talk

Submit ); } }

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const FIELDS = { speakerName: '', speakerEmail: '', talkTitle: '', talkDescription: '', talkLength: '15', }; let SubmissionForm = () => (

Speaker

Talk

Submit );

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Submit

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Submit Server

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Submit Server Success

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Submit Server Success Errors

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remoteCall Server { result: 'ok' } { errors: {…} }

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remoteCall Server { result: 'ok' } { 
 errors: { field1: [ 'error1', 'error2 field2: [ 'error1']
 }
 }

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{ 
 errors: { field1: [ 'error1', 'error2' ],
 field2: [ 'error1']
 }
 }

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class Form extends React.Component { state = { fields: this.props.fields, isSumitting: false, }; static childContextTypes = { /* … */ }; getChildContext() = { /* … */ } render() = { /* … */ } handleInputChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } await this.props.onSubmit(this.state.fields); }; }

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class Form extends React.Component { state = { fields: this.props.fields, errors: {}, isSumitting: false, }; static childContextTypes = { /* … */ }; getChildContext() = { /* … */ } render() = { /* … */ } handleInputChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true, errors: {} }); const { errors } = await this.props.onSubmit(this.state.fields); this.setState({ isSubmitting: false, errors: errors || {} }); }; }

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class Form extends React.Component { state = { fields: this.props.fields, errors: {}, isSumitting: false, }; static childContextTypes = { /* … */ }; getChildContext() = { /* … */ } render() = { /* … */ } handleInputChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true, errors: {} }); const { errors } = await this.props.onSubmit(this.state.fields); this.setState({ isSubmitting: false, errors: errors || {} }); }; }

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let Field = ({ name, input, label, ...props }, { formState: { fields, errors }, formHandleInputChange }) const value = fields[name]; const error = errors[name] && errors[name][0]; const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}: { error && {error}}
); };

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let Field = ({ name, input, label, ...props }, { formState: { fields, errors }, formHandleInputChange }) const value = fields[name]; const error = errors[name] && errors[name][0]; const Component = typeof input === 'function' ? input : INPUTS[input] || Input; const inputProps = Component === Input ? { type: input, ...props } : props; return (
{label}: { error && {error}}
); };

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class Form extends React.Component { state = { /* … */ }; static childContextTypes = { /* … */ }; getChildContext() = { /* … */ } render() = { /* … */ } handleInputChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true, errors: {} }); const { errors } = await this.props.onSubmit(this.state.fields); this.setState({ isSubmitting: false, errors: errors || {} }); }; }

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class Form extends React.Component { state = { /* … */ }; static childContextTypes = { /* … */ }; getChildContext() = { /* … */ } isUnmounted: boolean = false; componentWillUnmount() { this.isUnmounted = true; } render() = { /* … */ } handleInputChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true, errors: {} }); const { errors } = await this.props.onSubmit(this.state.fields); if (!this.isUnmounted) { this.setState({ isSubmitting: false, errors: errors || {} }); } }; }

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class Form extends React.Component { state = { /* … */ }; static childContextTypes = { /* … */ }; getChildContext() { /* … */ } isUnmounted: boolean = false; componentWillUnmount() { this.isUnmounted = true; } render() { /* … */ } handleChange = (e) => { /* … */ }; handleSubmit = async (e) => { e.preventDefault(); if (this.state.isSubmitting) { return; } this.setState({ isSubmitting: true, errors: {} }); const { errors } = await this.props.onSubmit(this.state.fields); if (!this.isUnmounted) { this.setState({ isSubmitting: false, errors: errors || {} }); } }; }

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• simple form interface • extensible fields • protection for double submit • standardized form layout • standardized server responses

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What is missing? • client side validations • theming • handling of deep nested forms • tests! • fun features ¯\_(ϑ)_/¯

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! https://github.com/tannerlinsley/react-form " https://github.com/prometheusresearch/react-forms # https://github.com/codecks-io/react-reform $ https://github.com/erikras/redux-form % https://github.com/Semantic-Org/Semantic-UI-React Libraries

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https://github.com/RStankov/talks-code

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https://speakerdeck.com/rstankov/forms-with-react

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https://www.meetup.com/React-Sofia/

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Thanks )

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