Vue.js 3: Future-Oriented Programming

This article is aimed at people who have at least some background in JavaScript and Vue.
If you are interested in Vue.js, you probably know about the 3rd version of this framework, which will be released shortly (if you are reading this article from the future, I hope it’s still relevant 😉). The new version is under active development for now, but all possible features can be found in separate RFC (request for comments) repository: https://github.com/vuejs/rfcs. One of them, function-api, can dramatically change the style of developing Vue apps.

What’s wrong with the current API? 👀The best way is to show everything in an example. So, let’s imagine that we need to implement a component that should fetch some user’s data, show loading state and topbar depending on scroll offset. Here is the final result:

Live example you can check here.It is good practice to extract some logic to reuse across multiple components. With Vue 2.x’s current API, there are a number of common patterns, most well known are:

  • Mixins (via the mixinsoption) 🍹
  • Higher-order components (HOCs) 🎢

So, let’s move scroll tracking logic into a mixin, and fetching logic into a higher-order component. Typical implementation with Vue you can see below.

Scroll mixin:

const scrollMixin = {
    data() {
        return {
            pageOffset: 0
        }
    },
    mounted() {
        window.addEventListener('scroll', this.update)
    },
    destroyed() {
        window.removeEventListener('scroll', this.update)
    },
    methods: {
        update() {
            this.pageOffset = window.pageYOffset
        }
    }
}


Here we addscrollevent listener, track page offset and save it in pageOffsetproperty.

The higher-order component will look like this:

import { fetchUserPosts } from '@/api'

const withPostsHOC = WrappedComponent => ({
    props: WrappedComponent.props,
    data() {
        return {
            postsIsLoading: false,
            fetchedPosts: []
        }
    },
    watch: {
        id: {
            handler: 'fetchPosts',
            immediate: true
        }
    },
    methods: {
        async fetchPosts() {
            this.postsIsLoading = true
            this.fetchedPosts = await fetchUserPosts(this.id)
            this.postsIsLoading = false
        }
    },
    computed: {
        postsCount() {
            return this.fetchedPosts.length
        }
    },
    render(h) {
        return h(WrappedComponent, {
            props: {
                ...this.$props,
                isLoading: this.postsIsLoading,
                posts: this.fetchedPosts,
                count: this.postsCount
            }
        })
    }
})

Here isLoading, postsproperties initialized for loading state and posts data respectively. The fetchPosts method will be invoked after creating an instance and every time props.idchanges, in order to fetch data for new id.

It’s not a complete implementation of HOC, but for this example, it will be enough. Here we just wrap the target component and pass original props alongside fetch-related props.Target component looks like this:

// ...
<script>
export default {
    name: 'PostsPage',
    mixins: [scrollMixin],
    props: {
        id: Number,
        isLoading: Boolean,
        posts: Array,
        count: Number
    }
}
</script>
// ...

To get specified props it should be wrapped in created HOC:

const PostsPage = withPostsHOC(PostsPage)

Full component with template and styles can be found here.
Great! 🥳 We just implemented our task using mixin and HOC, so they can be used by other components. But not everything is so rosy, there are several problems with these approaches.

1. Namespace clashing ⚔️

Imagine that we need to add update method to our component:

// ...
<script>
export default {
    name: 'PostsPage',
    mixins: [scrollMixin],
    props: {
        id: Number,
        isLoading: Boolean,
        posts: Array,
        count: Number
    },
    methods: {
        update() {
            console.log('some update logic here')
        }
    }
}
</script>
// ...

If you open the page again and scroll it, the topbar will not be shown anymore. This is due to the overwriting of mixin’s method update. The same works for HOCs. If you change the data field fetchedPosts to posts:

const withPostsHOC = WrappedComponent => ({
    props: WrappedComponent.props, // ['posts', ...]
    data() {
        return {
            postsIsLoading: false,
            posts: [] // fetchedPosts -> posts
        }
    },
    // ...

…you will get errors like this:

The reason for this is that wrapped component already specified property with the name posts

2. Unclear sources 📦

What if after some time you decided to use another mixin in your component:

// ...
<script>
export default {
    name: 'PostsPage',
    mixins: [scrollMixin, mouseMixin],
// ...

Can you tell exactly which mixin a pageOffsetproperty was injected from? Or in another scenario, both mixins can have, for example, yOffset property, so the last mixin will override property from the previous one. That’s not good and can cause a lot of unexpected bugs. 😕

3. Performance ⏱

Another problem with HOCs is that we need separate component instances created just for logic reuse purposes that come at a performance cost.

Let’s “setup” 🏗

Let’s see what alternative can offer the next Vue.js release and how we can solve the same problem using function-based API.

Since Vue 3 is not released yet, the helper plugin was created — vue-function-api. It provides function api from ue3.xto Vue2.xfor developing next-generation Vue applications.Firstly, you need to install it:

$ npm install vue-function-api

and explicitly install via Vue.use():

import Vue from 'vue'
import { plugin } from 'vue-function-api'

Vue.use(plugin)

The main addition function-based API provides is a new component option - setup(). As the name suggests, this is the place where we use the new API’s functions to setup the logic of our component. So, let’s implement a feature to show topbar depending on scroll offset. Basic component example:

// ...
<script>
export default {
  setup(props) {
    const pageOffset = 0

    return {
      pageOffset
    }
  }
}
</script>
// ...

Note that the setupfunction receives the resolved props object as its first argument and this propsobject is reactive. We also return an object containing pageOffsetproperty to be exposed to the template’s render context. This property becomes reactive too, but on the render context only. We can use it in the template as usual:

<div class="topbar" :class="{ open: pageOffset > 120 }">...</div>

But this property should be mutated on every scroll event. To implement this, we need to add scroll event listener when the component will be mounted and remove the listener — when unmounted. For these purposes value, onMounted, onUnmounted

API functions exist:

// ...
<script>
import { value, onMounted, onUnmounted } from 'vue-function-api'

export default {
  setup(props) {
    const pageOffset = value(0)
    const update = () => {
        pageOffset.value = window.pageYOffset
    }
    
    onMounted(() => window.addEventListener('scroll', update))
    onUnmounted(() => window.removeEventListener('scroll', update))
    
    return {
      pageOffset
    }
  }
}
</script>
// ...


Note that all lifecycle hooks in 2.x version of Vue have an equivalent onXXX function that can be used inside setup().

You probably also noticed that pageOffset variable contains a single reactive property: .value. We need to use this wrapped property because primitive values in JavaScript like numbers and strings are not passed by reference. Value wrappers provide a way to pass around mutable and reactive references for arbitrary value types.

Here’s how the pageOffset object looks like:

The next step is to implement the user’s data fetching. As well as when using option-based API, you can declare computed values and watchers using function-based API:

// ...
<script>
import {
    value,
    watch,
    computed,
    onMounted,
    onUnmounted
} from 'vue-function-api'
import { fetchUserPosts } from '@/api'

export default {
  setup(props) {
    const pageOffset = value(0)
    const isLoading = value(false)
    const posts = value([])
    const count = computed(() => posts.value.length)
    const update = () => {
      pageOffset.value = window.pageYOffset
    }
    
    onMounted(() => window.addEventListener('scroll', update))
    onUnmounted(() => window.removeEventListener('scroll', update))
    
    watch(
      () => props.id,
      async id => {
        isLoading.value = true
        posts.value = await fetchUserPosts(id)
        isLoading.value = false
      }
    )
    
    return {
      isLoading,
      pageOffset,
      posts,
      count
    }
  }
}
</script>
// ...

A computed value behaves just like a 2.x computed property: it tracks its dependencies and only re-evaluates when dependencies have changed. The first argument passed to watch is called a “source”, which can be one of the following:

  • a getter function
  • a value wrapper
  • an array containing the two above types

The second argument is a callback that will only get called when the value returned from the getter or the value wrapper has changed.

We just implemented the target component using function-based API. 🎉 The next step is to make all this logic reusable.

Decomposition 🎻 ✂️

This is the most interesting part, to reuse code related to a piece of logic we just can extract it into what called a “composition function” and return reactive state:

// ...
<script>
import {
    value,
    watch,
    computed,
    onMounted,
    onUnmounted
} from 'vue-function-api'
import { fetchUserPosts } from '@/api'

function useScroll() {
    const pageOffset = value(0)
    const update = () => {
        pageOffset.value = window.pageYOffset
    }

    onMounted(() => window.addEventListener('scroll', update))
    onUnmounted(() => window.removeEventListener('scroll', update))

    return { pageOffset }
}

function useFetchPosts(props) {
    const isLoading = value(false)
    const posts = value([])

    watch(
        () => props.id,
        async id => {
            isLoading.value = true
            posts.value = await fetchUserPosts(id)
            isLoading.value = false
        }
    )

    return { isLoading, posts }
}

export default {
    props: {
        id: Number
    },
    setup(props) {
        const { isLoading, posts } = useFetchPosts(props)
        const count = computed(() => posts.value.length)

        return {
            ...useScroll(),
            isLoading,
            posts,
            count
        }
    }
}
</script>
// ...

Note how we used useFetchPosts and useScroll functions to return reactive properties. These functions can be stored in separate files and used in any other component. Compared to the option-based solution:

  • Properties exposed to the template have clear sources since they are values returned from composition functions;
  • Returned values from composition functions arbitrarily named so there is no namespace collision;
  • There are no unnecessary component instances created just for logic reuse purposes.

There are a lot of other benefits that can be found on the official RFC page.

All code examples used in this article you can find here.

Live example of the component you can check here.

Conclusion

As you can see Vue’s function-based API presents a clean and flexible way to compose logic inside and between components without any of option-based API drawbacks. Just imagine how powerful composition functions could be for any type of project — from small to big, complex web apps. 🚀

I hope this post was useful 🎓. If you have any thoughts or questions, please feel free to respond and comment below! I will be glad to answer 🙂. Thanks.

#vue-js #javascript #web-development

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Vue.js 3: Future-Oriented Programming
Aria Barnes

Aria Barnes

1625232484

Why is Vue JS the most Preferred Choice for Responsive Web Application Development?

For more than two decades, JavaScript has facilitated businesses to develop responsive web applications for their customers. Used both client and server-side, JavaScript enables you to bring dynamics to pages through expanded functionality and real-time modifications.

Did you know!

According to a web development survey 2020, JavaScript is the most used language for the 8th year, with 67.7% of people choosing it. With this came up several javascript frameworks for frontend, backend development, or even testing.

And one such framework is Vue.Js. It is used to build simple projects and can also be advanced to create sophisticated apps using state-of-the-art tools. Beyond that, some other solid reasons give Vuejs a thumbs up for responsive web application development.

Want to know them? Then follow this blog until the end. Through this article, I will describe all the reasons and benefits of Vue js development. So, stay tuned.

Vue.Js - A Brief Introduction

Released in the year 2014 for public use, Vue.Js is an open-source JavaScript framework used to create UIs and single-page applications. It has over 77.4 million likes on Github for creating intuitive web interfaces.

The recent version is Vue.js 2.6, and is the second most preferred framework according to Stack Overflow Developer Survey 2019.

Every Vue.js development company is widely using the framework across the world for responsive web application development. It is centered around the view layer, provides a lot of functionality for the view layer, and builds single-page web applications.

Some most astonishing stats about Vue.Js:

• Vue was ranked #2 in the Front End JavaScript Framework rankings in the State of JS 2019 survey by developers.

• Approximately 427k to 693k sites are built with Vue js, according to Wappalyzer and BuiltWith statistics of June 2020.

• According to the State of JS 2019 survey, 40.5% of JavaScript developers are currently using Vue, while 34.5% have shown keen interest in using it in the future.

• In Stack Overflow's Developer Survey 2020, Vue was ranked the 3rd most popular front-end JavaScript framework.

Why is Vue.Js so popular?

• High-speed run-time performance
• Vue.Js uses a virtual DOM.
• The main focus is on the core library, while the collaborating libraries handle other features such as global state management and routing.
• Vue.JS provides responsive visual components.

Top 7 Reasons to Choose Vue JS for Web Application Development

Vue js development has certain benefits, which will encourage you to use it in your projects. For example, Vue.js is similar to Angular and React in many aspects, and it continues to enjoy increasing popularity compared to other frameworks.

The framework is only 20 kilobytes in size, making it easy for you to download files instantly. Vue.js easily beats other frameworks when it comes to loading times and usage.

Take a look at the compelling advantages of using Vue.Js for web app development.

#1 Simple Integration

Vue.Js is popular because it allows you to integrate Vue.js into other frameworks such as React, enabling you to customize the project as per your needs and requirements.

It helps you build apps with Vue.js from scratch and introduce Vue.js elements into their existing apps. Due to its ease of integration, Vue.js is becoming a popular choice for web development as it can be used with various existing web applications.

You can feel free to include Vue.js CDN and start using it. Most third-party Vue components and libraries are additionally accessible and supported with the Vue.js CDN.

You don't need to set up node and npm to start using Vue.js. This implies that it helps develop new web applications, just like modifying previous applications.

The diversity of components allows you to create different types of web applications and replace existing frameworks. In addition, you can also choose to hire Vue js developers to use the technology to experiment with many other JavaScript applications.

#2 Easy to Understand

One of the main reasons for the growing popularity of Vue.Js is that the framework is straightforward to understand for individuals. This means that you can easily add Vue.Js to your web projects.

Also, Vue.Js has a well-defined architecture for storing your data with life-cycle and custom methods. Vue.Js also provides additional features such as watchers, directives, and computed properties, making it extremely easy to build modern apps and web applications with ease.

Another significant advantage of using the Vue.Js framework is that it makes it easy to build small and large-scale web applications in the shortest amount of time.

#3 Well-defined Ecosystem

The VueJS ecosystem is vibrant and well-defined, allowing Vue.Js development company to switch users to VueJS over other frameworks for web app development.

Without spending hours, you can easily find solutions to your problems. Furthermore, VueJs lets you choose only the building blocks you need.

Although the main focus of Vue is the view layer, with the help of Vue Router, Vue Test Utils, Vuex, and Vue CLI, you can find solutions and recommendations for frequently occurring problems.

The problems fall into these categories, and hence it becomes easy for programmers to get started with coding right away and not waste time figuring out how to use these tools.

The Vue ecosystem is easy to customize and scales between a library and a framework. Compared to other frameworks, its development speed is excellent, and it can also integrate different projects. This is the reason why most website development companies also prefer the Vue.Js ecosystem over others.

#4 Flexibility

Another benefit of going with Vue.Js for web app development needs is flexibility. Vue.Js provides an excellent level of flexibility. And makes it easier for web app development companies to write their templates in HTML, JavaScript, or pure JavaScript using virtual nodes.

Another significant benefit of using Vue.Js is that it makes it easier for developers to work with tools like templating engines, CSS preprocessors, and type checking tools like TypeScript.

#5 Two-Way Communication

Vue.Js is an excellent option for you because it encourages two-way communication. This has become possible with the MVVM architecture to handle HTML blocks. In this way, Vue.Js is very similar to Angular.Js, making it easier to handle HTML blocks as well.

With Vue.Js, two-way data binding is straightforward. This means that any changes made by the developer to the UI are passed to the data, and the changes made to the data are reflected in the UI.

This is also one reason why Vue.Js is also known as reactive because it can react to changes made to the data. This sets it apart from other libraries such as React.Js, which are designed to support only one-way communication.

#6 Detailed Documentation

One essential thing is well-defined documentation that helps you understand the required mechanism and build your application with ease. It shows all the options offered by the framework and related best practice examples.

Vue has excellent docs, and its API references are one of the best in the industry. They are well written, clear, and accessible in dealing with everything you need to know to build a Vue application.

Besides, the documentation at Vue.js is constantly improved and updated. It also includes a simple introductory guide and an excellent overview of the API. Perhaps, this is one of the most detailed documentation available for this type of language.

#7 Large Community Support

Support for the platform is impressive. In 2018, support continued to impress as every question was answered diligently. Over 6,200 problems were solved with an average resolution time of just six hours.

To support the community, there are frequent release cycles of updated information. Furthermore, the community continues to grow and develop with backend support from developers.



Wrapping Up

VueJS is an incredible choice for responsive web app development. Since it is lightweight and user-friendly, it builds a fast and integrated web application. The capabilities and potential of VueJS for web app development are extensive.

While Vuejs is simple to get started with, using it to build scalable web apps requires professionalism. Hence, you can approach a top Vue js development company in India to develop high-performing web apps.

Equipped with all the above features, it doesn't matter whether you want to build a small concept app or a full-fledged web app; Vue.Js is the most performant you can rely on.

Original source

 

#vue js development company #vue js development company in india #vue js development company india #vue js development services #vue js development #vue js development companies

Luna  Mosciski

Luna Mosciski

1600583123

8 Popular Websites That Use The Vue.JS Framework

In this article, we are going to list out the most popular websites using Vue JS as their frontend framework.

Vue JS is one of those elite progressive JavaScript frameworks that has huge demand in the web development industry. Many popular websites are developed using Vue in their frontend development because of its imperative features.

This framework was created by Evan You and still it is maintained by his private team members. Vue is of course an open-source framework which is based on MVVM concept (Model-view view-Model) and used extensively in building sublime user-interfaces and also considered a prime choice for developing single-page heavy applications.

Released in February 2014, Vue JS has gained 64,828 stars on Github, making it very popular in recent times.

Evan used Angular JS on many operations while working for Google and integrated many features in Vue to cover the flaws of Angular.

“I figured, what if I could just extract the part that I really liked about Angular and build something really lightweight." - Evan You

#vuejs #vue #vue-with-laravel #vue-top-story #vue-3 #build-vue-frontend #vue-in-laravel #vue.js

sophia tondon

sophia tondon

1618971133

Top 10 VueJS Development Companies To Know In 2021-22

Vue.js is one of the most used and popular frontend development, or you can say client-side development framework. It is mainly used to develop single-page applications for both web and mobile. Famous companies like GitLab, NASA, Monito, Adobe, Accenture are currently using VueJS.

Do You Know?

Around 3079 companies reportedly use Vue.js in their tech stacks.
At GitHub, VueJS got 180.9K GitHub stars, including 28.5K GitHub forks.
Observing the increasing usage of VueJS and its robust features, various industry verticals are preferring to develop the website and mobile app Frontend using VueJS, and due to this reason, businesses are focusing on hiring VueJS developers from the top Vue.js development companies.

But the major concern of the enterprises is how to find the top companies to avail leading VueJS development service? Let’s move further and know what can help you find the best VueJS companies.

Read More - https://www.valuecoders.com/blog/technology-and-apps/top-10-vuejs-development-companies/

#hire vue js developer #hire vue.js developers #hire vue.js developer, #hire vue.js developers, #vue js development company #vue.js development company

Earlene  Rowe

Earlene Rowe

1595548860

Easily switch to Composition API in Vue.js 3

The fact that Vue.js 3 already reached the alpha version made me think that… it’s time already for some Vue.js 3 tips!

The idea is to give you some tips related to new features you can find on Vue.js 3 as they get available. For now, we’ll focus on Composition API, one of the most game-changing features!

This first one is specially focused on showing you a basic step-by-step guide or cheatsheet to migrate object-api Vue.js components to use Composition API. In future tips you’ll also see how to apply certain new techniques this API allow us to do as well.

I’ll do that by showing you how to convert an Object-API-based component to use Composition API.

For that, let’s create a MoneyCounter.vue component that basically shows a money amount and allow us to add/substract quantities to it, implemented using the following code:

<template>
  <div>
    <h2>{{ formattedMoney }}</h2>
    <input v-model="delta" type="number">
    <button @click="add">Add</button>
  </div>
</template>

<script>
export default {
  data: () => ({
    money: 10,
    delta: 1
  }),
  computed: {
    formattedMoney() {
      return this.money.toFixed(2);
    }
  },
  mounted() {
    console.log("Clock Object mounted!");
  },
  methods: {
    add() {
      this.money += Number(this.delta);
    }
  },
  watch: {
    money(newVal, oldVal) {
      console.log("Money changed", newVal, oldVal);
    }
  }
};
</script>

#vue #vue.js #api #vue.js 3 #programming

Top VueJS App Development Company in USA

AppClues Infotech is the best & most reliable VueJS App Development Company in USA that builds high-quality and top-notch mobile apps with advanced methodology. The company is focused on providing innovative & technology-oriented solutions as per your specific business needs.

The organization’s VueJS developers have high experience and we have the capability of handling small to big projects. Being one of the leading mobile app development company in USA we are using the latest programming languages and technologies for their clients.

Key Elements:

· Total year of experience - 8+

· Employees Strength - 120+

· Hourly Rate - $25 – $45 / hr

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· Successfully launched projects - 450+

VueJS Development Services by AppClues Infotech

· Custom VueJS Development

· Portal Development Solutions

· Web Application Development

· VueJS Plugin Development

· VueJS Ecommerce Development

· SPA (Single Page App) Development

· VueJS Migration

Why Hire VueJS Developers from AppClues Infotech?

· Agile & Adaptive Development

· 8+ Years of Average Experience

· 100% Transparency

· Guaranteed Bug-free VueJS Solution

· Flexible Engagement Models

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· Immediate Technical Support

If you have any project ideas for VueJS app development then share your requirements with AppClues Infotech to get the best solution for your dream projects.

For more info:
Share Yoru Requirements: https://www.appcluesinfotech.com/contact-us/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910
**

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