Ferris  Overweg

Ferris Overweg

1572681570

What problems are Vue.js scoped slots trying to solve?

When scoped slots were first introduced to Vue.js I found them quite challenging to fully understand, not so much the syntax but mostly around when and why I would use them.

This is because with scoped slots it’s more important to learn the concept over the syntax, so with this in mind lets dig deeper into scoped slots, we’ll start with regular slots to make sure we are all on the same page, and then move onto the problems that scoped slots are trying to solve.

This article covers the new scoped slot syntax using v-slot which was introduced in version 2.6.0, the older syntax using the slot and slot-scope attributes is now deprecated but is currently still available in the framework at the time of posting.

I will cover the older syntax at the end of this article since it is still widely used by many developers and there are plenty of instances of it in the wild.

What are regular slots?

Let’s quickly cover slots and how we use them in Vue, a regular slot is simply a way of passing data into a component, if you know how to use props already then the idea of passing data down into another component should seem pretty familiar, lets look at these two different approaches.

Using props to pass data into a component looks like this from the consumers point of view.

<Comment content="Im too old to play Mario Maker 2">

Props are great but when you need to pass data into a component that is something other than text or an object, then props tend to become less useful, mostly because passing in html through a prop would quickly turn into an awful sticky mess.

Instead, if we wanted to pass in some html for semantic and styling purposes, then we might use a regular slot in the following way.

<template>
  <div id="app">
    <Comment>
      <span class="text-center text-green-400">
        Making levels in Mario Maker 2 is Addictive!
      </span>
    </Comment>
  </div>
</template>

<script>
import Comment from './components/Comment'

export default {
  name: 'app',
  components: {
    Comment
  }
}
</script>

In this example above you can see that we are using the regular default slot to pass in not only the text, but we’re also passing in an extra wrapping span tag with some tailwindcss styles applied.

The content between the opening and closing tags is what will be passed down into the child and will replace the <slot></slot> tags inside the component.

The biggest advantage of slots in this scenario is that the consumer of the component can choose how to style the text since they are also responsible for passing in the wrapping span.

Defining a component with a slot in Vue.js is really simple, let’s take a quick look at how we would define this really simple example component now that we’ve seen how to use it.

<template>
  <div>
    <div>the following comment was left</div>
    <slot></slot>
  </div>
</template>

<script>
export default {
  name: 'Comment',
}
</script>

I know in this example that the output is largely redundant and pointless, but I am keeping things as simple as possible here just to try and explain the concept and not get bogged down with pages of html or components.

This works great, but we have a problem with the scoping, when we pass anything down into the child component from the parent it is evaluated in the parent, so if we wanted to access a value that was stored in the child component state, then we would be unable to since we would be evaluating all expressions in the parent component only.

I appreciate that may sound a little confusing, so let’s look at another example to see this problem occurring.

What problems are scoped slots trying to solve?

Lets define the problem with a few examples that we can build on, firstly lets create a component for listing out some data that we may have fetched from an API, some kind of <product-listing> component.

<template>
  <div class="products">
    <h1>A List of Nintendo Games</h1>
    <div>
      <div v-for="product in products" :key="product.id">
        <span class="product_name">{{ product.name }}</span>
        <span class="product_price">{{ product.price }}</span>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: "Mario Maker 2", rating: 4, price: 40000 },
        { id: 2, name: "Breath of the Wild", rating: 5, price: 60000 },
        { id: 3, name: "Tetris 99", rating: 4, price: 8000 }
      ]
    }
  }
}
</script>

Next, lets take a look at the code that would consume this component and how we might use it to display a basic list of Nintendo games.

<template>
  <div id="app">
    <product-listing></product-listing>
  </div>
</template>

<script>
import ProductListing from './components/ProductListing'

export default {
  name: 'app',
  components: {
    ProductListing
  }
}
</script>

This works okay (ish), however the main problem with this is that we have no way to change what information the child component displays or how it renders it in the browser.

For example, we might decide that as a consumer of this component we want to display the rating of the game, we don’t want to change the actual component itself as this behaviour might not always be necessary.

This is where we might reach for a normal slot, lets refactor this example and pass in what we want to display and replace the current static layout with a <slot>

<template>
  <div class="products">
    <h1>A List of Nintendo Games</h1>
    <div>
      <div v-for="product in products" :key="product.id">
        <slot></slot>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: "Mario Maker 2", rating: 4, price: 40000 },
        { id: 2, name: "Breath of the Wild", rating: 5, price: 60000 },
        { id: 3, name: "Tetris 99", rating: 4, price: 8000 }
      ]
    }
  }
}
</script>

Notice how we have removed the content for the product listing and replaced it with a slot that we want to just drop in, we then might try to consume this component like so.

<template>
  <div id="app">
    <product-listing>
      <span class="product_name">{{ product.name }}</span>
      <span class="product_rating">{{ product.rating }}</span>
      <span class="product_price">{{ product.price }}</span>
    </product-listing>
  </div>
</template>

<script>
import ProductListing from './components/ProductListing'

export default {
  name: 'app',
  components: {
    ProductListing
  }
}
</script>

When we then call this component from the parent you can see that we are passing in the span tags as well as the data we want to display, notice how we are passing in an extra piece of data we want to display here, the product rating.

As good as this looks, sadly it won’t work, if we take a look inside the chrome development tools we will see an error which reads something like this.

Property or method “product” is not defined on the instance but referenced during render.

This is image title

The problem here is that in the parent, we are trying to pass down the name, rating and price which are all stored on the product and the parent knows nothing about the data of product because this is scoped to the child component only.

What we need is a way to make the scope of our child component available to our parent component in-between the opening and closing <product-listing> tags, and that is exactly what scoped slots provide.

How to use scoped slots

Lets take a look at the refactored code to make use of scoped slots to get around the problem outlined above, firstly our component needs to make something in it’s current scope available to it’s parent, in our case this is a product.

<template>
  <div class="products">
    <h1>A List of Nintendo Games</h1>
    <div>
      <div v-for="product in products" :key="product.id">
        <slot :product="product"></slot>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: "Mario Maker 2", rating: 4, price: 40000 },
        { id: 2, name: "Breath of the Wild", rating: 5, price: 60000 },
        { id: 3, name: "Tetris 99", rating: 4, price: 8000 }
      ]
    }
  }
}
</script>

The line of most significance here is where we define the actual slot, you’ll notice that we have now bound the product to the actual slot tag making it available for our parent to use.

<slot :product="product"></slot>

This one simple line is essentially offering up something out of the child scope into the parent component if it wishes to use it.

If we want our parent to be able to take advantage of this offering from the child, then we can use the v-slot attribute, lets take a look at our refactored example of the parent.

<template>
  <div id="app">
    <product-listing>
      <template v-slot:default="slotProps">
        <span class="product_name">{{ slotProps.product.name }}</span>
        <span class="product_rating">{{ slotProps.product.rating }}</span>
        <span class="product_price">{{ slotProps.product.price }}</span>
      </template>
    </product-listing>
  </div>
</template>

<script>
  import ProductListing from './components/ProductListing'

  export default {
    name: 'app',
    components: {
      ProductListing
    }
  }
</script>

In the parent the most significant change is the content that we are passing down to the <product-listing> component, we are now using a template tag which will contain the content and the product on the slotScope

One point to note is that template tags are not rendered in the browser but the content will be, we are now accepting the scope that was offered to us from the child component.

<template v-slot:default="slotProps">
  <span class="product_name">{{ slotProps.product.name }}</span>
  <span class="product_rating">{{ slotProps.product.rating }}</span>
  <span class="product_price">{{ slotProps.product.price }}</span>
</template>

An interesting point to notice here is what the actual scoped content looks like that is offered back to the parent, if we take a look inside slotProps we will see the following :-

{
  "product": {
    "id": 1,
    "name": "Mario Maker 2",
    "rating": 4,
    "price": 40000
  }
}

Knowing this we can use JavaScript’s destructuring to allow us to just use the product variable name directly and remove the need for showing slotProps everywhere, let’s take a look at the final finished example.

<template>
  <div class="products">
    <h1>A List of Nintendo Games</h1>
    <div>
      <div v-for="product in products" :key="product.id">
        <slot :product="product"></slot>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: "Mario Maker 2", rating: 4, price: 40000 },
        { id: 2, name: "Breath of the Wild", rating: 5, price: 60000 },
        { id: 3, name: "Tetris 99", rating: 4, price: 8000 }
      ]
    }
  }
}
</script>
<template>
  <div id="app">
    <product-listing>
      <template v-slot:default="{ product }">
        <span class="product_name">{{ product.name }}</span>
        <span class="product_rating">{{ product.rating }}</span>
        <span class="product_price">{{ product.price }}</span>
      </template>
    </product-listing>
  </div>
</template>

<script>
import ProductListing from './components/ProductListing'

export default {
  name: 'app',
  components: {
    ProductListing
  }
}
</script>

As you can see, in the parent we are now using destructuring to remove that unsightly slotProps naming we had previously.

This concludes the example and hopefully you can see exactly how we used scoped slots to pass the product up to the parent which we can then use to pass in via a slot.

Why are scoped slots a source of confusion?

On reflection, scope slots were definitely the most difficult concept for me to grasp at the time of learning, I think the difficulty comes from the fact that we are passing scopes up to the parent whilst passing content back down after that scope data has been evaluated in the parent.

The constant back and forth between parent and child just feels a bit odd and it definitely bends the mind a little when learning these concepts.

However, don’t be deterred from learning these and getting them solidified in your brain, they are in my mind one of the most important concepts of Vue.js and make the entire framework much more powerful.

The deprecated syntax of scoped slots

As I mentioned at the top of this article, the syntax we have covered is the new 2.6.0 syntax, however the older syntax is used regularly, infact I am working on a freelance project at the moment which uses scoped slots heavily throughout, and at the moment they are using the old syntax, so lets quickly see that in action.

<template>
  <div class="products">
    <h1>A List of Nintendo Games</h1>
    <div>
      <div v-for="product in products" :key="product.id">
        <slot :product="product"></slot>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      products: [
        { id: 1, name: "Mario Maker 2", rating: 4, price: 40000 },
        { id: 2, name: "Breath of the Wild", rating: 5, price: 60000 },
        { id: 3, name: "Tetris 99", rating: 4, price: 8000 }
      ]
    }
  }
}
</script>
<template>
  <div id="app">
    <product-listing>
      <template slot-scope="{ product }">
        <span class="product_name">{{ product.name }}</span>
        <span class="product_rating">{{ product.rating }}</span>
        <span class="product_price">{{ product.price }}</span>
      </template>
    </product-listing>
  </div>
</template>

<script>
import ProductListing from './components/ProductListing'

export default {
  name: 'app',
  components: {
    ProductListing
  }
}
</script>

As you can see, the component is the same, however we are using the slightly more verbose slot-scope attribute on a template tag.

For more information around the reasoning for this change, take a look at the RFC which outlines the details of why it was changed.

Conclusion

This post has been very code heavy, and as I mentioned earlier, scoped slots were easily the most tricky part of learning the framework, but in later blog posts I will show you some examples of some very powerful patterns which utilise scoped slots and you’ll see even more examples of how just important they are.

Thank for reading! If you liked this post, share it with all of your programming buddies!

#Vuejs #JavaScript #Frontend #Scoped Slots #Components

What is GEEK

Buddha Community

What problems are Vue.js scoped slots trying to solve?
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

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

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

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

· Location - New York, USA

· 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

· On-Time Project Delivery

· 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
**

#top vue.js development company #vue.js app development company #best vue js development company #hire top vue js developers #hire top vue.js developers in usa #vue js development company usa

Vincent Lab

Vincent Lab

1605176864

How to do Problem Solving as a Developer

In this video, I will be talking about problem-solving as a developer.

#problem solving skills #problem solving how to #problem solving strategies #problem solving #developer