higher-order-components

How does the inner function in a HOC get the props

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问题 I'm just getting my head around using HOC in React , one thing that is confusing me slightly is, how does my inner function in this example gain access to props as an argument? const withProps = Component => ( props => { return <Component {...props}/> } ) export default withProps 回答1: To add more to what @AliAnarkali said, a HOC returns you a component so when you write like const EnhancedApp = withProps(App); EnhancedApp is basically const EnhancedApp = props => { return <Component {...props

React: How to wrap component with HOC? (access login property across components)

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问题 I have a react (with redux & react-router) app that at various points needs to know whether or not a user is logged in based on the state of some data in the store and a bunch of other things tied to data in the store. To achieve this, I've created a higher order component like so: import React from 'react'; import {connect} from 'react-redux'; export function masterComponent(Component){ class MasterComponent extends React.Component { constructor(props){ super(props); } loggedIn(){ return

How can i resolve this error in React+Material UI

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问题 I'm getting the following error while tried to run the application in Mac and Ubuntu. But it runs without any errors in Windows platform. How can i resolve this. Is there any platform specific code in Material UI beta version(v1.0.0-beta.46). I have used the withStyles component, which is an higher order component of material ui. Error: /node_modules/material-ui/styles/withStyles.js Module not found: Can't resolve '@babel/runtime/core-js/map' The below is my code import React from 'react';

Pass data between two components in React Native

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问题 I have a component that encapsulates three components one of them is the DrawerLayoutAndroid . Now I want to pass the reference of the drawer from the drawer component to the main component and then pass it to the header component so I can trigger it from the header component. I have no idea how to do that. Here is the main component 'cases.js' import React, { Component } from 'react'; import { View, Text, StyleSheet, TouchableOpacity } from 'react-native'; import Header from '@components

re-rendering issues when using HOC for loader

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问题 I am building an app where there is tons of pages and each page needs loader icon to show when the data is coming from server but has not arrived yet but no content is shown if there is no data at all. I could show this without using Higher Order Component(HOC) with no problem but doing so in every component is tedious. I want the loader code be reusable so that i can use this in every component wherever needed. But I am facing the problem. If there is data, there is no issue. If there is no

How do I pass an HTML element to a higher-order function (HOC) in React?

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问题 I often use HOCs to provide additional functionality to an existing React component, which is pretty straightforward: import Component from '/path/to/Component'; import higherOrderComponent from '/path/to/higherOrderComponent'; const EnhancedComponent = higherOrderComponent(Component); However, I need to wrap a simple HTML input , which doesn't exist as a standalone React component. I tried const EnhancedInput = higherOrderComponent(<input />); and got the following error: Uncaught Error:

How can i resolve this error in React+Material UI

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I'm getting the following error while tried to run the application in Mac and Ubuntu. But it runs without any errors in Windows platform. How can i resolve this. Is there any platform specific code in Material UI beta version(v1.0.0-beta.46). I have used the withStyles component, which is an higher order component of material ui. Error: /node_modules/material-ui/styles/withStyles.js Module not found: Can't resolve '@babel/runtime/core-js/map' The below is my code import React from 'react'; import PropTypes from 'prop-types'; import withStyles from 'material-ui/styles'; import AppBar from

Redux higher order components same as container components

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问题 I'm trying to wrap my head around higher order components, are these the same as Redux container components. Plus what is the recommended way to write higher order components (container components) is it through a class that extends React.Component or without one as given in the redux site. 回答1: There's so much written on the subject, so I'll just try to briefly explain the concept and how it is related to Redux. You could think of HOC as an enhancer (or "decorator"). It takes an existing

Flow error when passing props through flow-typed higher ordered components

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问题 Consider the following code. Wrapper1 renders Wrapper2 , passing into it the Final component as a prop, along with a couple props that Final ultimately expects, finalProp and w2prop . Wrapper2 then renders the component passed into it, passing along all its props to that rendered component. In this case, the Final component is getting rendered by Wrapper2 , and it is receiving its needed props. However, Flow does not understand this. I'm receiving the following two errors: property finalProp

Redux higher order components same as container components

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I'm trying to wrap my head around higher order components, are these the same as Redux container components. Plus what is the recommended way to write higher order components (container components) is it through a class that extends React.Component or without one as given in the redux site. There's so much written on the subject, so I'll just try to briefly explain the concept and how it is related to Redux. You could think of HOC as an enhancer (or "decorator"). It takes an existing component and returns a new, improved one. Common tasks would be: injecting props, composing, changing the way