News Monday, June 18

How to do Simple Form Validation in #Reactjs – Hacker Noon

  • /Form.js’;class App extends Component { – render() { – return ( – div className=App – div className=App-header – img src={logo} className=App-logo alt=logo / – h2React Form Validation Demo/h2 – /div – Form / – /div – ); – } – }export default App;Now, lets create that Form component in src/Form….
  • /Form.css;class Form extends Component { – render () { – return ( – form className=demoForm – h2Sign up/h2 – div className=form-group – label htmlFor=emailEmail address/label – input type=email className=form-control – name=email / – /div – div className=form-group – label input type=password className=form-control – name=password / – /div – button type=submit…
  • So lets add couple of properties to our initial state: – constructor (props) { – super(props); – this.state = { – email: ”, – password: ”, – formErrors: {email: ”, password: ”}, – emailValid: false, – passwordValid: false, – formValid: false – } – }Were adding a property called formErrors…
  • js: – import React from react;export const FormErrors = ({formErrors}) = – div className=’formErrors’ – i) = { – 0){ – return ( – p key={i}{fieldName} {formErrors[fieldName]}/p – ) – } else { – return ”; – } – })} – /divIts a stateless functional component (or presentational component) which…
  • Well add the bootstrap has-error class to a fields form-group based on its error value: – div className={`form-group – is a method we can define as: – errorClass(error) { – return(error.length === 0 ? ”

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How to do Simple Form Validation in #Reactjs – Hacker Noon

Learn React.js in 5 minutes – freeCodeCamp

  • The setup – When getting started with React, you should use the simplest setup possible: an HTML file which imports the React and the ReactDOM libraries using script tags, like this: – html – head – script /scriptscript div id=root/div – script type=text/babel – – /* – ADD REACT CODE…
  • To get our tiny application to render on the screen we also have to use Hello /, – this is where we connect our Hello component with the entry point for the app (div id=root/div).
  • class Hello extends React.Component { – – constructor(){ – super(); – this.state = { – message: my friend (from state)! – }
  • class Hello extends React.Component { – – constructor(){ – super(); – this.state = { – message: my friend (from state)! – }
  • Heres the entire component: – class Hello extends React.Component { – – constructor(){ – super(); – this.state = { – message: my friend (from state)! – }

Tags:

Learn React.js in 5 minutes – freeCodeCamp

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