install packages
npm installstart
npm run startbelow you can see a bit notation about connection React-Redux
React bindings are not available in Redux by default. You will need to install an extra library called react-redux first.
npm install --save react-reduxThe library exports just two APIs that you need to remember, a component and a higher-order function known as connect().
The connect() function is used to bind React containers to Redux. What that means is that you can use the connect feature to:
- subscribe to the store and map its state to your props
- dispatch actions and map the dispatch callbacks into your props
Once you've connected your application to Redux, you can use this.props to access the current state and also to dispatch actions.
First, import connect
import { connect } from 'react-redux';Second, create two methods: mapStateToProps and mapDispatchToProps. With react-redux.connect we can connect our redux store to a component:
function mapStateToProps(state){
let transformAuthors = state.authors.map(author => {
return {
value: author.id,
text: author.firstName + ' '+ author.lastName
}
})
return{
authors: transformAuthors
}
}
function mapDispatchToProps(dispatch){
return{
actions: bindActionCreators(courseActions,dispatch)
}
}mapStateToProps receives the state of the store as an argument. It returns an object that describes how the state of the store is mapped into your props. mapDispatchToProps returns a similar object that describes how the dispatch actions are mapped to your props.
Finally, we use connect to bind the AddContact component to the two functions as follows:
connect(mapStateToProps, mapDispatchToProps)(ManageCoursePage)Note:
mapDispatchToPropsfunction we can use 3 ways
- Ignore it. Use dispatch
this.props.dispatch(loadCourses()) - Manually wrap
function mapDispatchToProps(dispatch){
return{
loadCourses: () => {
dispatch(loadCourses())
}
}
}- Use
bindActionCreators
function mapDispatchToProps(dispatch){
return{
actions: bindActionCreators(actions, dispatch)
}
}In component:
this.props.actions.loadCourses()If you want redirect to another page you need use withRouter
import { withRouter } from 'react-router-dom'After import library in your component you can use it. If you see below it's very easy to use
redirectToAddCoursePage(){
this.props.history.push('/course')
}if you need populate your form then you refresh a page, you need use componentWillReceiveProps. This method is called when props are passed to the Component instance. Let's dig a little deeper into what this means.
import React from 'react';
export default class Form extends React.Component {
constructor(props) {
super(props)
this.state = {
course: {...this.props.course},
}
}
componentWillReceiveProps(nextProps){
if(this.state.course.id !== nextProps.course.id) {
this.setState({course:{...nextProps.course}})
}
}
} For write unit test I've chosen
- mocha
- Enzyme
- expect
first you need Helper files
So let’s create the src/test/helpers/browser.js file, and include the following:
import expect from 'expect';
import { configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
import { mount, render, shallow } from 'enzyme';
configure({ adapter: new Adapter() });
global.expect = expect;
global.mount = mount;
global.render = render;
global.shallow = shallow; And src/test/dom.js will have our mocked DOM:
const jsdom = require('jsdom');
const { JSDOM } = jsdom;
function setUpDomEnvironment() {
const dom = new JSDOM('<!doctype html><html><body></body></html>');
const { window } = dom;
global.window = window;
global.document = window.document;
global.navigator = {
userAgent: 'node.js',
};
copyProps(window, global);
}
function copyProps(src, target) {
const props = Object.getOwnPropertyNames(src)
.filter(prop => typeof target[prop] === 'undefined')
.map(prop => Object.getOwnPropertyDescriptor(src, prop));
Object.defineProperties(target, props);
}
setUpDomEnvironment();Our setup is now complete. We can run our tests with npm run test by adding these scripts to our package.json:
"scripts": {
"test": "mocha --compilers js:@babel/register --require ./src/test/helpers/browser.js --require ./src/test/helpers/dom.js --recursive \"./src/test/**/*.spec.js*\""
}
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