Skeleton Loading Pages with React

What are Skeleton pages? And how can you implement them in React?

We’ve all been there.

You click a button expecting the next page to instantly fill your screen with content, only to be met with a dreaded loading icon — seconds become minutes as you frantically reload the page in a bid to get what you asked for.

My point being, nobody likes to wait…

In an aim to mitigate this torture emerged a clever visual illusion that seems to reduce the perceived loading time. Introducing **skeleton loading pages — **which are essentially a blank version of the page where information is gradually loaded.

Skeleton loading screens are widely used across pretty much all your favourite websites:

Facebook & YouTube

The user is instantly greeted with the skeleton as it pulses with grey shapes which mimic the page layout. The content requested replaces the placeholdersas they become available, until the skeleton’s job is done — creating the illusion of an instant transition.

Skeleton pages in React

There are some packages out there that you can use, for example React Loading Skeleton. However, this will add dependencies to your codebase and are not as customisable as if you were to develop your own. The rest of this guide will show you how to implement skeleton loading with styled-components, but the same principles can be applied with vanilla CSS.

The approach we went with for implementing skeleton loading pages is not to create a separate, dedicated skeleton page but rather a built-in ‘skeleton state’ of a component. This is a more robust and scalable solution that will allow for more flexible loading patterns across different pages.

Let’s start by making a simple skeleton component that can be reused across pages. First, let’s add some styling for the pulse of the skeleton. The reason we separate the pulse out, is so I can use it for more shapes (e.g. circles, rectangles, etc.) if needed.

const SSkeletonPulse = styled.div`
  display: inline-block;
  height: 100%;
  width: 100%;
  background: linear-gradient(-90deg, #F0F0F0 0%, #F8F8F8 50%, #F0F0F0 100%);
  background-size: 400% 400%;
  animation: pulse 1.2s ease-in-out infinite;
  @keyframes pulse {
    0% {
      background-position: 0% 0%;
    }
    100% {
      background-position: -135% 0%;
    }
  }
`;

Next, add some styling for the skeleton line. Skeleton components become more robust if they can inherit some styling from their parent element. A really effective trick is to use the line height of parent element to set the size of the skeleton component — this is done by using the ::before selector and filling it with empty content *(*a string, “\00a0”).

const SSkeletonLine = styled(SSkeletonPulse)`
  width: 5.5em;
  border-radius: 5px;

  &::before {
    content: "\00a0";
  }
`;

As you can see above, instead of having to create three skeleton lines with different sizes, the same skeleton line inherits three different sizes from the respective parent elements.

We can then export our skeleton line to be used across pages.

export const SkeletonLine = () => (
  <SSkeletonLine />
);

Now we have our skeleton, we need to implement it. As mentioned, the approach we use is to create a ‘skeleton state’ for the desired component. The implementation will depend on what data your page is using but we want the skeleton to render when the data we need is undefined and render the page once the data has been loaded. For example:

if (data === undefined) {
  const profileContent = (
    <Profile>
      <ProfileName><SkeletonLine /></ProfileName>
      <ProfileBio><SkeletonLine /></ProfileBio>
    </Profile>
  );
  } else {
    const profileContent = (
      <Profile>
        <ProfileName>{username}</ProfileName>
        <ProfileBio>{userBio}</ProfileBio>
      </Profile>
    );
}

return profileContent;

You could also use a ternary but I think it’s clearer to use if statements when components become more complex. This method allows you to import your skeleton to any component and it seamlessly build entire skeleton pages quickly.

If you want to build a more customisable skeleton, you can allow it to take in props that change the styling of the skeleton. For example, these skeletons work well on white/neutral backgrounds but not so well when the background is darker. I want to be able to make my skeleton line translucent for some pages:

const SSkeletonPulse = styled.div`
  display: inline-block;
  height: 100%;
  width: 100%;
  background: ${props =>
    props.translucent
      ? css`linear-gradient(-90deg, #C1C1C1 0%, #F8F8F8 50%, #C1C1C1 100%)`
      : css`linear-gradient(-90deg, #F0F0F0 0%, #F8F8F8 50%, #F0F0F0 100%)`};
  background-size: 400% 400%;
  animation: pulse 1.2s ease-in-out infinite;
  @keyframes pulse {
    0% {
      background-position: 0% 0%;
    }
    100% {
      background-position: -135% 0%;
    }
  }
`;

export const SkeletonLine = () => (
  <SSkeletonLine translucent={translucent} />
);

So, if I want to make the skeleton line translucent, all I have to do in the SkeletonLine element is:

<SkeletonLine translucent={true} />

Conclusion

Skeleton loading pages have become the go-to solution for all your loading transition needs. Some research validates the idea that the perceived loading time is shorter for skeletons as opposed to spinners, for example. But before you dive in to skeletons, there are some caveats:

You are increasing the amount of code you have — your components will need an additional layer of logic to handle what should be rendered and when. This will add a significant amount of code to what was originally a simple React component and could make things harder to debug. Also, as mentioned above, if you decide to use a package, you are adding more dependencies to your codebase, which increases security risks and is less customisable than implementing a simple solution yourself.

Changes to components inevitably mean changes to the skeleton. The method outlined above is robust, however, if you change the layout or add features, you also need to make sure the skeletons are changed to reflect that.

Although some research validates skeleton loading pages, there has also been skepticism around their effectiveness; citing small sample size and lack of variation as concerns about studies conducted — there have even been conflicting reports stating that skeleton pages may perform worse for perceived loading time.

Regardless, the use of skeleton loading pages is everywhere and is quickly becoming the expectation of what the ‘loading experience’ is. As you can see, it’s not hard to do, so give it a go, experiment with different approaches and decide if they are just a trend or if they really do work…

#reactjs #javascript #web-development

What is GEEK

Buddha Community

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

Dotnet Script: Run C# Scripts From The .NET CLI

dotnet script

Run C# scripts from the .NET CLI, define NuGet packages inline and edit/debug them in VS Code - all of that with full language services support from OmniSharp.

NuGet Packages

Name	Version	Framework(s)
dotnet-script (global tool)		net6.0, net5.0, netcoreapp3.1
Dotnet.Script (CLI as Nuget)		net6.0, net5.0, netcoreapp3.1
Dotnet.Script.Core		netcoreapp3.1 , netstandard2.0
Dotnet.Script.DependencyModel		netstandard2.0
Dotnet.Script.DependencyModel.Nuget		netstandard2.0

Installing

Prerequisites

The only thing we need to install is .NET Core 3.1 or .NET 5.0 SDK.

.NET Core Global Tool

.NET Core 2.1 introduced the concept of global tools meaning that you can install dotnet-script using nothing but the .NET CLI.

dotnet tool install -g dotnet-script

You can invoke the tool using the following command: dotnet-script
Tool 'dotnet-script' (version '0.22.0') was successfully installed.

The advantage of this approach is that you can use the same command for installation across all platforms. .NET Core SDK also supports viewing a list of installed tools and their uninstallation.

dotnet tool list -g

Package Id         Version      Commands
---------------------------------------------
dotnet-script      0.22.0       dotnet-script

dotnet tool uninstall dotnet-script -g

Tool 'dotnet-script' (version '0.22.0') was successfully uninstalled.

Windows

choco install dotnet.script

We also provide a PowerShell script for installation.

(new-object Net.WebClient).DownloadString("https://raw.githubusercontent.com/filipw/dotnet-script/master/install/install.ps1") | iex

Linux and Mac

curl -s https://raw.githubusercontent.com/filipw/dotnet-script/master/install/install.sh | bash

If permission is denied we can try with sudo

curl -s https://raw.githubusercontent.com/filipw/dotnet-script/master/install/install.sh | sudo bash

Docker

A Dockerfile for running dotnet-script in a Linux container is available. Build:

cd build
docker build -t dotnet-script -f Dockerfile ..

And run:

docker run -it dotnet-script --version

Github

You can manually download all the releases in zip format from the GitHub releases page.

Usage

Our typical helloworld.csx might look like this:

Console.WriteLine("Hello world!");

That is all it takes and we can execute the script. Args are accessible via the global Args array.

dotnet script helloworld.csx

Scaffolding

Simply create a folder somewhere on your system and issue the following command.

dotnet script init

This will create main.csx along with the launch configuration needed to debug the script in VS Code.

.
├── .vscode
│   └── launch.json
├── main.csx
└── omnisharp.json

We can also initialize a folder using a custom filename.

dotnet script init custom.csx

Instead of main.csx which is the default, we now have a file named custom.csx.

.
├── .vscode
│   └── launch.json
├── custom.csx
└── omnisharp.json

Note: Executing dotnet script init inside a folder that already contains one or more script files will not create the main.csx file.

Running scripts

Scripts can be executed directly from the shell as if they were executables.

foo.csx arg1 arg2 arg3

OSX/Linux

Just like all scripts, on OSX/Linux you need to have a #! and mark the file as executable via chmod +x foo.csx. If you use dotnet script init to create your csx it will automatically have the #! directive and be marked as executable.

The OSX/Linux shebang directive should be #!/usr/bin/env dotnet-script

#!/usr/bin/env dotnet-script
Console.WriteLine("Hello world");

You can execute your script using dotnet script or dotnet-script, which allows you to pass arguments to control your script execution more.

foo.csx arg1 arg2 arg3
dotnet script foo.csx -- arg1 arg2 arg3
dotnet-script foo.csx -- arg1 arg2 arg3

Passing arguments to scripts

All arguments after -- are passed to the script in the following way:

dotnet script foo.csx -- arg1 arg2 arg3

Then you can access the arguments in the script context using the global Args collection:

foreach (var arg in Args)
{
    Console.WriteLine(arg);
}

All arguments before -- are processed by dotnet script. For example, the following command-line

dotnet script -d foo.csx -- -d

will pass the -d before -- to dotnet script and enable the debug mode whereas the -d after -- is passed to script for its own interpretation of the argument.

NuGet Packages

dotnet script has built-in support for referencing NuGet packages directly from within the script.

#r "nuget: AutoMapper, 6.1.0"

Note: Omnisharp needs to be restarted after adding a new package reference

Package Sources

We can define package sources using a NuGet.Config file in the script root folder. In addition to being used during execution of the script, it will also be used by OmniSharp that provides language services for packages resolved from these package sources.

As an alternative to maintaining a local NuGet.Config file we can define these package sources globally either at the user level or at the computer level as described in Configuring NuGet Behaviour

It is also possible to specify packages sources when executing the script.

dotnet script foo.csx -s https://SomePackageSource

Multiple packages sources can be specified like this:

dotnet script foo.csx -s https://SomePackageSource -s https://AnotherPackageSource

Creating DLLs or Exes from a CSX file

Dotnet-Script can create a standalone executable or DLL for your script.

Switch	Long switch	description
-o	--output	Directory where the published executable should be placed. Defaults to a 'publish' folder in the current directory.
-n	--name	The name for the generated DLL (executable not supported at this time). Defaults to the name of the script.
	--dll	Publish to a .dll instead of an executable.
-c	--configuration	Configuration to use for publishing the script [Release/Debug]. Default is "Debug"
-d	--debug	Enables debug output.
-r	--runtime	The runtime used when publishing the self contained executable. Defaults to your current runtime.

The executable you can run directly independent of dotnet install, while the DLL can be run using the dotnet CLI like this:

dotnet script exec {path_to_dll} -- arg1 arg2

Caching

We provide two types of caching, the dependency cache and the execution cache which is explained in detail below. In order for any of these caches to be enabled, it is required that all NuGet package references are specified using an exact version number. The reason for this constraint is that we need to make sure that we don't execute a script with a stale dependency graph.

Dependency Cache

In order to resolve the dependencies for a script, a dotnet restore is executed under the hood to produce a project.assets.json file from which we can figure out all the dependencies we need to add to the compilation. This is an out-of-process operation and represents a significant overhead to the script execution. So this cache works by looking at all the dependencies specified in the script(s) either in the form of NuGet package references or assembly file references. If these dependencies matches the dependencies from the last script execution, we skip the restore and read the dependencies from the already generated project.assets.json file. If any of the dependencies has changed, we must restore again to obtain the new dependency graph.

Execution cache

In order to execute a script it needs to be compiled first and since that is a CPU and time consuming operation, we make sure that we only compile when the source code has changed. This works by creating a SHA256 hash from all the script files involved in the execution. This hash is written to a temporary location along with the DLL that represents the result of the script compilation. When a script is executed the hash is computed and compared with the hash from the previous compilation. If they match there is no need to recompile and we run from the already compiled DLL. If the hashes don't match, the cache is invalidated and we recompile.

You can override this automatic caching by passing --no-cache flag, which will bypass both caches and cause dependency resolution and script compilation to happen every time we execute the script.

Cache Location

The temporary location used for caches is a sub-directory named dotnet-script under (in order of priority):

1. The path specified for the value of the environment variable named DOTNET_SCRIPT_CACHE_LOCATION, if defined and value is not empty.
2. Linux distributions only: $XDG_CACHE_HOME if defined otherwise $HOME/.cache
3. macOS only: ~/Library/Caches
4. The value returned by Path.GetTempPath for the platform.

 

Debugging

The days of debugging scripts using Console.WriteLine are over. One major feature of dotnet script is the ability to debug scripts directly in VS Code. Just set a breakpoint anywhere in your script file(s) and hit F5(start debugging)

Script Packages

Script packages are a way of organizing reusable scripts into NuGet packages that can be consumed by other scripts. This means that we now can leverage scripting infrastructure without the need for any kind of bootstrapping.

Creating a script package

A script package is just a regular NuGet package that contains script files inside the content or contentFiles folder.

The following example shows how the scripts are laid out inside the NuGet package according to the standard convention .

└── contentFiles
    └── csx
        └── netstandard2.0
            └── main.csx

This example contains just the main.csx file in the root folder, but packages may have multiple script files either in the root folder or in subfolders below the root folder.

When loading a script package we will look for an entry point script to be loaded. This entry point script is identified by one of the following.

• A script called main.csx in the root folder
• A single script file in the root folder

If the entry point script cannot be determined, we will simply load all the scripts files in the package.

The advantage with using an entry point script is that we can control loading other scripts from the package.

Consuming a script package

To consume a script package all we need to do specify the NuGet package in the #loaddirective.

The following example loads the simple-targets package that contains script files to be included in our script.

#load "nuget:simple-targets-csx, 6.0.0"

using static SimpleTargets;
var targets = new TargetDictionary();

targets.Add("default", () => Console.WriteLine("Hello, world!"));

Run(Args, targets);

Note: Debugging also works for script packages so that we can easily step into the scripts that are brought in using the #load directive.

Remote Scripts

Scripts don't actually have to exist locally on the machine. We can also execute scripts that are made available on an http(s) endpoint.

This means that we can create a Gist on Github and execute it just by providing the URL to the Gist.

This Gist contains a script that prints out "Hello World"

We can execute the script like this

dotnet script https://gist.githubusercontent.com/seesharper/5d6859509ea8364a1fdf66bbf5b7923d/raw/0a32bac2c3ea807f9379a38e251d93e39c8131cb/HelloWorld.csx

That is a pretty long URL, so why don't make it a TinyURL like this:

dotnet script https://tinyurl.com/y8cda9zt

Script Location

A pretty common scenario is that we have logic that is relative to the script path. We don't want to require the user to be in a certain directory for these paths to resolve correctly so here is how to provide the script path and the script folder regardless of the current working directory.

public static string GetScriptPath([CallerFilePath] string path = null) => path;
public static string GetScriptFolder([CallerFilePath] string path = null) => Path.GetDirectoryName(path);

Tip: Put these methods as top level methods in a separate script file and #load that file wherever access to the script path and/or folder is needed.

REPL

This release contains a C# REPL (Read-Evaluate-Print-Loop). The REPL mode ("interactive mode") is started by executing dotnet-script without any arguments.

The interactive mode allows you to supply individual C# code blocks and have them executed as soon as you press Enter. The REPL is configured with the same default set of assembly references and using statements as regular CSX script execution.

Basic usage

Once dotnet-script starts you will see a prompt for input. You can start typing C# code there.

~$ dotnet script
> var x = 1;
> x+x
2

If you submit an unterminated expression into the REPL (no ; at the end), it will be evaluated and the result will be serialized using a formatter and printed in the output. This is a bit more interesting than just calling ToString() on the object, because it attempts to capture the actual structure of the object. For example:

~$ dotnet script
> var x = new List<string>();
> x.Add("foo");
> x
List<string>(1) { "foo" }
> x.Add("bar");
> x
List<string>(2) { "foo", "bar" }
>

Inline Nuget packages

REPL also supports inline Nuget packages - meaning the Nuget packages can be installed into the REPL from within the REPL. This is done via our #r and #load from Nuget support and uses identical syntax.

~$ dotnet script
> #r "nuget: Automapper, 6.1.1"
> using AutoMapper;
> typeof(MapperConfiguration)
[AutoMapper.MapperConfiguration]
> #load "nuget: simple-targets-csx, 6.0.0";
> using static SimpleTargets;
> typeof(TargetDictionary)
[Submission#0+SimpleTargets+TargetDictionary]

Multiline mode

Using Roslyn syntax parsing, we also support multiline REPL mode. This means that if you have an uncompleted code block and press Enter, we will automatically enter the multiline mode. The mode is indicated by the * character. This is particularly useful for declaring classes and other more complex constructs.

~$ dotnet script
> class Foo {
* public string Bar {get; set;}
* }
> var foo = new Foo();

REPL commands

Aside from the regular C# script code, you can invoke the following commands (directives) from within the REPL:

Command	Description
#load	Load a script into the REPL (same as #load usage in CSX)
#r	Load an assembly into the REPL (same as #r usage in CSX)
#reset	Reset the REPL back to initial state (without restarting it)
#cls	Clear the console screen without resetting the REPL state
#exit	Exits the REPL

Seeding REPL with a script

You can execute a CSX script and, at the end of it, drop yourself into the context of the REPL. This way, the REPL becomes "seeded" with your code - all the classes, methods or variables are available in the REPL context. This is achieved by running a script with an -i flag.

For example, given the following CSX script:

var msg = "Hello World";
Console.WriteLine(msg);

When you run this with the -i flag, Hello World is printed, REPL starts and msg variable is available in the REPL context.

~$ dotnet script foo.csx -i
Hello World
>

You can also seed the REPL from inside the REPL - at any point - by invoking a #load directive pointed at a specific file. For example:

~$ dotnet script
> #load "foo.csx"
Hello World
>

Piping

The following example shows how we can pipe data in and out of a script.

The UpperCase.csx script simply converts the standard input to upper case and writes it back out to standard output.

using (var streamReader = new StreamReader(Console.OpenStandardInput()))
{
    Write(streamReader.ReadToEnd().ToUpper());
}

We can now simply pipe the output from one command into our script like this.

echo "This is some text" | dotnet script UpperCase.csx
THIS IS SOME TEXT

Debugging

The first thing we need to do add the following to the launch.config file that allows VS Code to debug a running process.

{
    "name": ".NET Core Attach",
    "type": "coreclr",
    "request": "attach",
    "processId": "${command:pickProcess}"
}

To debug this script we need a way to attach the debugger in VS Code and the simplest thing we can do here is to wait for the debugger to attach by adding this method somewhere.

public static void WaitForDebugger()
{
    Console.WriteLine("Attach Debugger (VS Code)");
    while(!Debugger.IsAttached)
    {
    }
}

To debug the script when executing it from the command line we can do something like

WaitForDebugger();
using (var streamReader = new StreamReader(Console.OpenStandardInput()))
{
    Write(streamReader.ReadToEnd().ToUpper()); // <- SET BREAKPOINT HERE
}

Now when we run the script from the command line we will get

$ echo "This is some text" | dotnet script UpperCase.csx
Attach Debugger (VS Code)

This now gives us a chance to attach the debugger before stepping into the script and from VS Code, select the .NET Core Attach debugger and pick the process that represents the executing script.

Once that is done we should see our breakpoint being hit.

Configuration(Debug/Release)

By default, scripts will be compiled using the debug configuration. This is to ensure that we can debug a script in VS Code as well as attaching a debugger for long running scripts.

There are however situations where we might need to execute a script that is compiled with the release configuration. For instance, running benchmarks using BenchmarkDotNet is not possible unless the script is compiled with the release configuration.

We can specify this when executing the script.

dotnet script foo.csx -c release

 

Nullable reference types

Starting from version 0.50.0, dotnet-script supports .Net Core 3.0 and all the C# 8 features. The way we deal with nullable references types in dotnet-script is that we turn every warning related to nullable reference types into compiler errors. This means every warning between CS8600 and CS8655 are treated as an error when compiling the script.

Nullable references types are turned off by default and the way we enable it is using the #nullable enable compiler directive. This means that existing scripts will continue to work, but we can now opt-in on this new feature.

#!/usr/bin/env dotnet-script

#nullable enable

string name = null;

Trying to execute the script will result in the following error

main.csx(5,15): error CS8625: Cannot convert null literal to non-nullable reference type.

We will also see this when working with scripts in VS Code under the problems panel.

Download Details:
Author: filipw
Source Code: https://github.com/filipw/dotnet-script
License: MIT License

#dotnet  #aspdotnet  #csharp 

10 Best React Loading Component for Your App

While instant feedback from an app or website is best, sometimes your product won’t be able to adhere to speed guidelines. The slow response may be due to poor internet connection or the operation process may take a long time. For such cases, the designer must reassure the user that:
The application is working according to their requirements and the actual process is still active.

If you are unable to shorten the process, you should at least try to make the wait pleasant for your users. Here are 10 react loading components for your react.js application

1. Create React Content Loader

Have you heard about react-content-loader? It’s a SVG component to create placeholder loading, like Facebook cards loading or also known as skeleton UI. So now you can use this online tool to create your own loader easily. You just need to draw using the canvas or code using the live editing!

View Demo: https://danilowoz.com/create-content-loader/

Github: https://github.com/danilowoz/create-content-loader

Download Link: https://github.com/danilowoz/create-content-loader/archive/master.zip

2. react-loading

React-Loading is a React-based Loading animation component library includes many exquisite and beautiful loading components. It will effectively relieve the user’s anxiety when you give loading dynamics tips at the appropriate place and moment in your project. This component library supports on-demand loading, so pick a favorite Loading component now to enrich your project

View Demo: http://139.196.82.33:8080/iframe.html?id=demo–demo

Github: https://github.com/sixiaodong123/react-loading

Download Link: https://github.com/sixiaodong123/react-loading/archive/master.zip

3. react-simple-infinite-loading

Someone pointed out the React implementation of the list was a bit complex. I figure out it was possible to write an abstraction for this particular case. Here it is!

This component aims to stay easy to use. If your use case needs more options I recommend using directly awesome libraries from Brian Vaughn listed in dependencies section.

View Demo: https://codesandbox.io/s/magical-shockley-vhkz8

Github: https://github.com/frinyvonnick/react-simple-infinite-loading

Download Link: https://github.com/frinyvonnick/react-simple-infinite-loading/archive/master.zip

4. react-pure-loaders

React Pure Loaders is a package that disponibilizes loaders for your Project. Those loaders are used as components, using color and a loading variables as properties.

The component expects the to receive the color as a string with the hexadecimal code and the loading as a boolean, that is true by default.

View Demo: https://reactpureloaders.io/

Github: https://github.com/jameswlane/react-pure-loaders

Download Link: https://github.com/jameswlane/react-pure-loaders

5. react-loadcon

React component to manipulate the favicon, as a loading or progress indicator, for now. The idea of “Favicon as DOM” is under construction.

View Demo: https://foreseaz.github.io/react-loadcon/

Github: https://github.com/foreseaz/react-loadcon

Download Link: https://github.com/foreseaz/react-loadcon/archive/master.zip

6. React Nested Loader

The easiest way to manage loaders/errors inside a button. NOT an UI lib.

• Manage loading/error state of nested views/buttons triggering async actions
• Not an UI lib, you provide the UI. Works with ReactNative.
• No boilerplate at all, no need to use setState/Redux

View Demo: https://codesandbox.io/s/w640yv5p9w

Github: https://github.com/slorber/react-nested-loader

Download Link: https://github.com/slorber/react-nested-loader/archive/master.zip

7. react-wait

react-wait is a React Hook helps to manage multiple loading states on the page without any conflict. It’s based on a very simple idea that manages an Array of multiple loading states. The built-in loader component listens its registered loader and immediately become loading state.

View Demo: https://codesandbox.io/s/y3w5v5lk0j

Github: http://github.com/f/react-wait

Download Link: https://reactjsexample.com/complex-loader-management-hook-for-react/

8. React Redux Loading Bar

A React component that provides Loading Bar (aka Progress Bar) for long running tasks.

Consists of:

• React component — displays loading bar and simulates progress
• Redux reducer — manages loading bar’s part of the store
• (optional) Redux middleware — automatically shows and hides Loading Bar for actions with promises

View Demo: https://mironov.github.io/react-redux-loading-bar/

Github: http://github.com/mironov/react-redux-loading-bar

Download Link: https://github.com/mironov/react-redux-loading-bar/archive/master.zip

9. Material UI Image

Images are ugly until they’re loaded. Materialize it with material image! It will fade in like the material image loading pattern suggests.

View Demo: https://mui.wertarbyte.com/#material-ui-image

Github: http://github.com/TeamWertarbyte/material-ui-image

Download Link: https://github.com/TeamWertarbyte/material-ui-image/archive/master.zip

10. React Lazy Load Image Component

React Component to lazy load images and other components/elements. Includes a HOC to track window scroll position to improve performance.

React Component to lazy load images and components using a HOC to track window scroll position.

View Demo: https://www.albertjuhe.com/react-lazy-load-image-component/

Github: http://github.com/Aljullu/react-lazy-load-image-component

Download Link: https://github.com/Aljullu/react-lazy-load-image-component/archive/master.zip

#loading #react-loading #react-loading-component #react #react-js

How to Select and Hire the Best React JS and React Native Developers?

Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.

What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

React vs React Native

• React Native is a platform that uses a collection of mobile-specific components provided by the React kit, while React.js is a JavaScript-based library.
• React.js and React Native have similar syntax and workflows, but their implementation is quite different.
• React Native is designed to create native mobile apps that are distinct from those created in Objective-C or Java. React, on the other hand, can be used to develop web apps, hybrid and mobile & desktop applications.
• React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

What is the Average React Developer Salary?

In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

* React.js Developer Salary by Country

• United States- $120,000
• Canada - $110,000
• United Kingdom - $71,820
• The Netherlands $49,095
• Spain - $35,423.00
• France - $44,284
• Ukraine - $28,990
• India - $9,843
• Sweden - $55,173
• Singapore - $43,801

In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.

However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

How to Hire React.js Developers?

• Conduct thorough candidate research, including portfolios and areas of expertise.
• Before you sit down with your interviewing panel, do some homework.
• Examine the final outcome and hire the ideal candidate.

Why is React.js Popular?

React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

Final thoughts:

As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.

If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation

#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer

React Sidebar Example | How To Create Sidebar Component In React

The React Sidebar component is a responsive expandable and collapsible container area that holds primary and secondary information placed alongside the main content of a webpage.

We use a library called react-burger-menu and also create a sidebar component using the  Material UI library. This library will help us to build a sidebar menu component in React.js. We are not using  Redux so that we will build with plain React.js.

Table Of Contents

• Step 1: Install React.js
• Step 2: Create a Sidebar Menu
• Step 3: Import the sidebar.js file inside an App.js file.
• Create React Sidebar Component using Material UI
• Write the Sidebar.js component.

---

Step 1: Install React.js

Type the following command to install React.js.

npx create-react-app sidebar

Go inside the folder and open it in the VSCode editor.

cd sidebar
code .

Now, install the react-burger-menu library using the following command.

npm install react-burger-menu --save

# or

yarn add react-burger-menu

Step 2: Create a Sidebar Menu

In this sidebar component, we can add a list of items displayed inside the sidebar. Here, we will make use of react-burger-menu as well.

import React from 'react';
import { slide as Menu } from 'react-burger-menu';

export default props => {
  return (
    <Menu>
      <a className="menu-item" href="/">
        Home
      </a>

      <a className="menu-item" href="/laravel">
        Laravel
      </a>

      <a className="menu-item" href="/angular">
        Angular
      </a>

      <a className="menu-item" href="/react">
        React
      </a>

      <a className="menu-item" href="/vue">
        Vue
      </a>

      <a className="menu-item" href="/node">
        Node
      </a>
    </Menu>
  );
};

So, here we have imported the slide component from the react-burger menu. 

Step 3: Import the sidebar.js file inside an App.js file.

Write the following code inside an App.js file.

import React from 'react';
import SideBar from './sidebar';

import './App.css';

export default function App() {
  return (
    <div id="App">
      <SideBar />
      <div id="page-wrap">
        <h1>AppDividend</h1>
        <h2>Check out our tutorials the side menubar</h2>
      </div>
    </div>
  );
}

Now, finally, add the CSS code inside the App.css file.

body {
  margin: 0;
}

#App {
  font-family: sans-serif;
  height: 100vh;
}

#page-wrap {
  text-align: center;
  overflow: auto;
}

.bm-item {
  display: inline-block;
  text-decoration: none;
  margin-bottom: 10px;
  color: #d1d1d1;
  transition: color 0.2s;
}

.bm-item:hover {
  color: white;
}

.bm-burger-button {
  position: fixed;
  width: 36px;
  height: 30px;
  left: 36px;
  top: 36px;
}

.bm-burger-bars {
  background: #373a47;
}

.bm-cross-button {
  height: 24px;
  width: 24px;
}

.bm-cross {
  background: #bdc3c7;
}

.bm-menu {
  background: #373a47;
  padding: 2.5em 1.5em 0;
  font-size: 1.15em;
}

.bm-morph-shape {
  fill: #373a47;
}

.bm-item-list {
  color: #b8b7ad;
}

.bm-overlay {
  background: rgba(0, 0, 0, 0.3);
}

After saving the file, go to the terminal and start the React development server.

npm start

So at this URL: http://localhost:3000/. You can see that our React.js project is up and running.

To try out our different animations, merely change the imported slide at the top of our sidebar.js file to any other animations, such as bubble. To use a different animation, you can substitute slides with any following.

•  slide
• stack
• elastic
• bubble
• push
• pushRotate
• scaleDown
• scaleRotate
• fallDown
• reveal

Properties

Some animations require certain other elements to be on your page.

Page Wrapper

An element wrapping the rest of the content on your page.

<Menu pageWrapId={ "page-wrap" } />
<main id="page-wrap">
  .
  .
  .
</main>

Outer container

An element containing everything, including the menu component.

<div id="outer-container">
  <Menu pageWrapId={ "page-wrap" } outerContainerId={ "outer-container" } />
  <main id="page-wrap">
    .
    .
    .
  </main>
</div>

Create React Sidebar Component using Material UI

Let’s create a simple sidebar component in React using Material UI.

First, install the following material package using Yarn or NPM.

yarn  add @material-ui/core @material-ui/icons

# or

npm install @material-ui/core @material-ui/icons

Once that is installed, we need to think of it as a base structure in the user interface that our sidebar will be built upon.

A solution is to use an unordered list (<ul>) element that renders the list items (<li>).

We will import List and ListItem from @material-ui/core library since the List component is essentially the ul element, and the ListItem component is essentially the li.

Let’s start off hardcoding the couple of items in the sidebar to visualize how this might look like to boost our confidence. Sometimes a little extra confidence can help improve our productivity:

Now, create a folder inside the src folder called components.

The next step is to write the following code inside the src >> components >> Sidebar.js file.

Write the following code inside that file.

import React from 'react'

function Sidebar() {
  return null
}

Now, import the component inside the src >> App.js file.

import React from 'react';
import './App.css';

import Sidebar from './components/Sidebar';

 function App() {
    return (
      <div>
        <Sidebar items={items}/>
      </div>
    );
  }

Now, we add the items which we will display in the sidebar. Let’s take five elements.

Write the following code inside the App.js file.

import React from 'react';
import './App.css';

import Sidebar from './components/Sidebar';

const items = [
  { name: 'home', label: 'Home' },
  { name: 'sales', label: 'Sales' },
  { name: 'orders', label: 'Orders' },
  { name: 'billing', label: 'Billing' },
  { name: 'settings', label: 'Settings' }]

function App() {
  return (
    <div class="sidebar">
      <Sidebar items={items} />
    </div>
  );
}

You might have noticed that our sidebar is just too dang big! *Side*bars usually take up one side of the screen. So what we are going to do is shrink its width to a suitable size. We will go ahead and put a max-width of 200px on it. So we’re going to create a div element that wraps our List component.

We create another div element instead of directly applying the styles on the List component because we don’t want to make List responsible for the width size.

This way, in the future, we can choose to abstract the List into a reusable sidebar component where it can adapt to any size depending on the size of the parent element.

So, add one css class inside the App.css file.

.sidebar {
  max-width: 240px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

Material-UI uses its CSS styling mechanism using the CSS-in-JS approach. But we will stick to regular CSS in this article to keep things unnecessarily complicated.

Write the Sidebar.js component.

Okay, now our final step is to add the following code inside the Sidebar.js file.

import React from 'react'
import List from '@material-ui/core/List'
import ListItem from '@material-ui/core/ListItem'
import ListItemText from '@material-ui/core/ListItemText'

function Sidebar({ items }) {
  return (
    <div className="sidebar">
      <List disablePadding dense>
        {items.map(({ label, name, ...rest }) => (
          <ListItem key={name} button {...rest}>
            <ListItemText>{label}</ListItemText>
          </ListItem>
        ))}
      </List>
    </div>
  )
}

Save the file and see the output. 

React sidebar component finished

Happy Coding!!!

#react.js #react #react sidebar