Understanding Dynamic imports, Lazy and Suspense using React Hooks

An exciting journey

It has been an exciting journey so far with the #2articles1week challenge from HashNode. So much of learning from reading the great articles coming out of it. I believe, all the writers taking part in it, are the Real Winners.

I am proudly at the 4th week(last week) of the challenge and here goes my 9th article as part of it. Hope you enjoy reading it.

What are we going to learn today?

If you are new to the web development, you are probably learning about the code modularity, components, bundling etc. If you are a veteran, you are mostly doing it already. These are few key aspects we should learn and reflect on, irrespective of the library or framework we use for web development.

In this article, I am going to explain the advantages of knowing few techniques from react to do better with,

  • Code Bundling and Splitting.
  • Loading the code dynamically on demand(a-la-carte vs platter meal).
  • Gain on application performance, first load etc.
  • Build the flexibility of plug and play.

We are going to learn about, Dynamic import of react components, usage of React.Lazy and Suspense. You really do not need any prior experiences to follow this article. However having very basic understanding of react will be an advantage.

Shape, Color and Size

Let us build an app to get us some shapes, colors and sizes on button clicks. Here is a screen-shot that shows the three different states of the app when the respective buttons are clicked.

demo.png

Do you want to play with the app now? Not a problem.

The components

Let me introduce three simple components here, ShapeDemoColorDemo and SizeDemo shows some random shapes, colors and sizes respectively. I am using Feather icons to create them.

ShapeDemo Component

import React from 'react';
import { Square, Triangle, Circle, Box, Heart, Hexagon } from 'react-feather';

const ShapeDemo = () => {
    return(
        <>
            <h1>Shape Demo</h1>
            <div className="demo">
                <Square color="black" size={128} /> { ' '}
                <Triangle color="black" size={128} /> { ' '}
                <Circle color="black" size={128} /> { ' '}
                <Box color="black" size={128} /> { ' '}
                <Heart color="black" size={128} /> { ' '}
                <Hexagon color="black" size={128} /> { ' '}
            </div>
        </>
    )
};

export default ShapeDemo;

ColorDemo Component

import React from 'react';
import { Circle } from 'react-feather';

const ColorDemo = () => {
    const colorMap = ['#A63578', 'teal', '#000000', 'orange', 'red',
        'green', 'blue', 'purple', 'yellow'];
    return(
        <>
            <h1>Color Demo</h1>
            <div className="demo">
                {
                    colorMap.map((color, index) => (
                        <Circle 
                              color={color} 
                              fill={color} 
                              key={index} 
                              size={128} /> 
                    ))
                }
            </div>
        </>
    )
};

export default ColorDemo;

SizeDemo Component

import React from 'react';
import { Circle } from 'react-feather';

const SizeDemo = () => {
    const sizeMap = ['16', '32', '48', '64', '96', '128', '144'];

    return(
        <>
            <h1>Size Demo</h1>
            <div className="demo">
                {
                    sizeMap.map((size, index) => (
                        <Circle 
                              color="black" 
                              fill="black" 
                              key={index} 
                              size={size} /> 
                    ))
                }
            </div>
        </>
    )
};

export default SizeDemo;

These are simple react components that we are going to import and render with the respective button clicks.

#react #javascript #general programming #beginner

What is GEEK

Buddha Community

Understanding Dynamic imports, Lazy and Suspense using React Hooks
Autumn  Blick

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

What are hooks in React JS? - INFO AT ONE

In this article, you will learn what are hooks in React JS? and when to use react hooks? React JS is developed by Facebook in the year 2013. There are many students and the new developers who have confusion between react and hooks in react. Well, it is not different, react is a programming language and hooks is a function which is used in react programming language.
Read More:- https://infoatone.com/what-are-hooks-in-react-js/

#react #hooks in react #react hooks example #react js projects for beginners #what are hooks in react js? #when to use react hooks

Umeng Analytics & Push Flutter Plugins

Umeng Analytics&Push Flutter Plugins(umeng_analytics_push) 

  • Language: English | 中文简体
  • Umeng API: umeng:analytics & umeng:push
  • Tip: From v2.1.0 supported Umeng "Compliance Guide" Android IOS, and made appropriate adjustments to facilitate integration.
  • Note: The following document description shall prevail, do not refer to the settings in the example

Usages

Import

dependencies:
  umeng_analytics_push: ^x.x.x #The latest version is shown above, plugin1.x supports flutter1.x, plugin2.x supports flutter2.x

# Or import through Git (choose one, Git version may be updated more timely)

dependencies:
  umeng_analytics_push:
      git:
        url: https://github.com/zileyuan/umeng_analytics_push.git

Android pretreatment settings (with Kotlin example)

Create a custom FlutterApplication class as the startup class, if the push function is not needed, uemng_message_secret is set to null or ""

package com.demo.umeng.app

import io.flutter.app.FlutterApplication
import io.github.zileyuan.umeng_analytics_push.UmengAnalyticsPushFlutterAndroid

class MyFlutterApplication: FlutterApplication() {
    override fun onCreate() {
        super.onCreate();
        UmengAnalyticsPushFlutterAndroid.androidPreInit(this, "uemng_app_key", "channel", "uemng_message_secret")
    }
}

Modify MainActivity, add Umeng settings

package com.demo.umeng.app

import android.os.Handler
import android.os.Looper
import android.content.Intent
import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant
import io.github.zileyuan.umeng_analytics_push.UmengAnalyticsPushFlutterAndroid
import io.github.zileyuan.umeng_analytics_push.UmengAnalyticsPushPlugin

class MainActivity: FlutterActivity() {
    var handler: Handler = Handler(Looper.myLooper())

    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }

    override fun onNewIntent(intent: Intent) {
        // Actively update and save the intent every time you go back to the front desk, and then you can get the latest intent
        setIntent(intent);
        super.onNewIntent(intent);
    }

    override fun onResume() {
        super.onResume()
        UmengAnalyticsPushFlutterAndroid.androidOnResume(this)
        if (getIntent().getExtras() != null) {
            var message = getIntent().getExtras().getString("message")
            if (message != null && message != "") {
                // To start the interface, wait for the engine to load, and send it to the interface with a delay of 5 seconds
                handler.postDelayed(object : Runnable {
                    override fun run() {
                        UmengAnalyticsPushPlugin.eventSink.success(message)
                    }
                }, 5000)
            }
        }
    }

    override fun onPause() {
        super.onPause()
        UmengAnalyticsPushFlutterAndroid.androidOnPause(this)
    }
}

Modify the AndroidManifest.xml file

<application
  android:name="com.demo.umeng.app.MyFlutterApplication">
</application>

Add the vendor push channel, see the official documentation for details umeng:push:vendor

Modify MyFlutterApplication

package com.demo.umeng.app

import io.flutter.app.FlutterApplication
import io.github.zileyuan.umeng_analytics_push.UmengAnalyticsPushFlutterAndroid

class MyFlutterApplication: FlutterApplication() {
    override fun onCreate() {
        super.onCreate();
        UmengAnalyticsPushFlutterAndroid.androidInit(this, "uemng_app_key", "channel", "uemng_message_secret")
        // Register Xiaomi Push (optional)
        UmengAnalyticsPushFlutterAndroid.registerXiaomi(this, "xiaomi_app_id", "xiaomi_app_key")
        // Register Huawei Push (optional, need add other infomation in AndroidManifest.xml)
        UmengAnalyticsPushFlutterAndroid.registerHuawei(this)
        // Register Oppo Push (optional)
        UmengAnalyticsPushFlutterAndroid.registerOppo(this, "oppo_app_key", "oppo_app_secret")
        // Register Vivo Push (optional, need add other infomation in AndroidManifest.xml)
        UmengAnalyticsPushFlutterAndroid.registerVivo(this)
        // Register Meizu Push (optional)
        UmengAnalyticsPushFlutterAndroid.registerMeizu(this, "meizu_app_id", "meizu_app_key")
    }
}

Modify the AndroidManifest.xml, fill in the real id or key

<application
  android:name="com.demo.umeng.app.MyFlutterApplication">
    <!-- Vivo push channel start (optional) -->
    <meta-data
        android:name="com.vivo.push.api_key"
        android:value="vivo_api_key" />
    <meta-data
        android:name="com.vivo.push.app_id"
        android:value="vivo_app_id" />
    <!-- Vivo push channel end-->

    <!-- Huawei push channel start (optional) -->
    <meta-data
        android:name="com.huawei.hms.client.appid"
        android:value="appid=huawei_app_id" />
    <!-- Huawei push channel end-->
</application>

Use the following parameters to send, accept offline messages

"mipush": true
"mi_activity": "io.github.zileyuan.umeng_analytics_push.OfflineNotifyClickActivity"  

If the App needs to use proguard for obfuscated packaging, please add the following obfuscated code

-dontwarn com.umeng.**
-dontwarn com.taobao.**
-dontwarn anet.channel.**
-dontwarn anetwork.channel.**
-dontwarn org.android.**
-dontwarn org.apache.thrift.**
-dontwarn com.xiaomi.**
-dontwarn com.huawei.**
-dontwarn com.meizu.**

-keepattributes *Annotation*

-keep class com.taobao.** {*;}
-keep class org.android.** {*;}
-keep class anet.channel.** {*;}
-keep class com.umeng.** {*;}
-keep class com.xiaomi.** {*;}
-keep class com.huawei.** {*;}
-keep class com.meizu.** {*;}
-keep class org.apache.thrift.** {*;}

-keep class com.alibaba.sdk.android.** {*;}
-keep class com.ut.** {*;}
-keep class com.ta.** {*;}

-keep public class **.R$* {
    public static final int *;
}

IOS pretreatment settings (with Swift example)

Modify AppDelegate.swift file

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
    override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        GeneratedPluginRegistrant.register(with: self)
        UmengAnalyticsPushFlutterIos.iosPreInit(launchOptions, appkey:"uemng_app_key", channel:"appstore");
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }

    // If you need to handle Push clicks, use the following code
    @available(iOS 10.0, *)
    override func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        UmengAnalyticsPushFlutterIos.handleMessagePush(userInfo)
        completionHandler()
    }
}

Modify Runner-Bridging-Header.h file

#import "GeneratedPluginRegistrant.h"
#import <UMCommon/UMCommon.h>
#import <UMCommon/MobClick.h>
#import <UMPush/UMessage.h>
#import <UserNotifications/UserNotifications.h>
#import <umeng_analytics_push/UmengAnalyticsPushIos.h>

Use in Flutter

Initialize Umeng, call it after agreeing to the "Privacy Policy" according to the "Compliance Guide", two parameter switches, one is log, the other is push

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

UmengAnalyticsPush.initUmeng(false, true);

Click Push response

import 'package:umeng_analytics_push/umeng_analytics_push.dart';
import 'package:umeng_analytics_push/message_model.dart';

UmengAnalyticsPush.addPushMessageCallback((MessageModel message) {
  print("UmengAnalyticsPush Message ======> $message");
});

Operation Alias

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

UmengAnalyticsPush.addAlias('1001', 'jobcode');
UmengAnalyticsPush.setAlias('1002', 'jobcode');
UmengAnalyticsPush.deleteAlias('1002', 'jobcode');

Operation Tags

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

UmengAnalyticsPush.addTags('manager');
UmengAnalyticsPush.deleteTags('manager');

Page buried point operation

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

UmengAnalyticsPush.pageStart('memberPage');
UmengAnalyticsPush.pageEnd('memberPage');

Custom event

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

UmengAnalyticsPush.event('customEvent', '1000');

Use this package as a library

Depend on it

Run this command:

With Flutter:

 $ flutter pub add umeng_analytics_push

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  umeng_analytics_push: ^2.1.3

Alternatively, your editor might support or flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:umeng_analytics_push/umeng_analytics_push.dart';

example/lib/main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
        ),
      ),
    );
  }
} 

Download Details:

Author: zileyuan

Source Code: https://github.com/zileyuan/umeng_analytics_push

#flutter #analytics 

Hayden Slater

1599277908

Validating React Forms With React-Hook-Form

Validating inputs is very often required. For example, when you want to make sure two passwords inputs are the same, an email input should in fact be an email or that the input is not too long. This is can be easily done using React Hook From. In this article, I will show you how.

Required Fields

The most simple, yet very common, validation is to make sure that an input component contains input from the user. React Hook Form basic concept is to register input tags to the form by passing register() to the tag’s ref attribute. As we can see here:

#react-native #react #react-hook-form #react-hook

Erna  Herzog

Erna Herzog

1626748440

Build a React Accordion from Scratch Using React Hooks and No Extra Dependencies

Follow these step-by-step instructions to create an animated accordion component in React.js using React Hooks and CSS.

🗂 DOWNLOADS 🗂

https://gum.co/AEeem

🔗 HELPFUL RESOURCES 🔗

React DOM Elements: https://reactjs.org/docs/dom-elements.html

Overview of dangerouslySetInnerHTML: https://react-cn.github.io/react/tips/dangerously-set-inner-html.html

How to prevent XSS attacks when using dangerouslySetInnerHTML in React: https://dev.to/jam3/how-to-prevent-xss-attacks-when-using-dangerouslysetinnerhtml-in-react-1464

Hooks API Reference: https://reactjs.org/docs/hooks-reference.html

Visual Studio Code: https://code.visualstudio.com/

#react #react hooks #react accordion #css #react.js