大家好我是redux的新手。我正在创建一个示例应用程序,如下所示:
入口点:index.js
import 'babel-polyfill'
import React from 'react'
import { render } from 'react-dom'
import { Provider } from 'react-redux'
import { createStore } from 'redux'
import inboundApp from './reducers'
import App from './components/App'
let store = createStore(inboundApp)
render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('app')
)
/components/App.js
import React from 'react'
import HeaderContainer from '../containers/HeaderContainer'
import LoginForm from '../containers/LoginForm'
const App = () => (
<div>
<HeaderContainer />
<LoginForm />
</div>
)
export default App
< p> /containers/LoginForm.js import React from 'react'
import { connect } from 'react-redux'
import { login } from '../actions'
let LoginForm = ({ dispatch }) => {
let input
return (
<div>
<form onSubmit={e => {
e.preventDefault()
if (!input.value.trim()) {
return
}
dispatch(login(input.value))
input.value = ''
}}>
<input ref={node => {
input = node
}} />
<button type="submit">
Login
</button>
</form>
</div>
)
}
LoginForm = connect()(LoginForm)
export default LoginForm
/actions/index.js
export const login = (supplierId) => {
return {
type: 'LOGIN',
supplierId
}
}
/containers/HeaderContainer.js
{{ 2}}/components/Header.js
import { connect } from 'react-redux'
import Header from '../components/Header'
const mapStateToProps = (state) => {
return {
supplierId: state.supplierId
}
}
const HeaderContainer = connect(
mapStateToProps,
null
)(Header)
export default HeaderContainer
/reducers/loginForm.js
import React, { PropTypes } from 'react'
const Header = ({ supplierId}) => {
return (
<div>
<span>Your Supplier ID: </span> {supplierId}
</div>
)
}
export default Header
/reducers/index.js
const loginForm = (state = '', action) => {
switch (action.type) {
case 'LOGIN':
return Object.assign({}, state, {
supplierId: action.supplierId
})
default:
return state;
}
}
export default loginForm
问题是我的演示文稿组件标题没有通过 LOGIN 获取更新,该操作通过单击<中的按钮来触发strong> LoginForm.js 。
请你帮我找一下我错过的东西?这段代码出了什么问题?
谢谢
答案 0 :(得分:1)
我认为你试图从错误的命名空间获取supplierId,而你的默认状态loginForm并不好。试试这样:
const loginForm = (state = {supplierId: ''}, action) => {
switch (action.type) {
case 'LOGIN':
return Object.assign({}, state, {
supplierId: action.supplierId
})
default:
return state;
}
}
连接
const mapStateToProps = (state) => {
return {
supplierId: state.loginForm.supplierId
}
}