Common mistakes to avoid while working with Vue.js for Beginners

Common mistakes to avoid while working with Vue.js for Beginners

In this article, I’d like to share a few common issues that you may have to deal with when working with Vue.js. Some of these issues may seem obvious, but I figured that sharing my experience might help someone.

Include template compiler

My first issue was a pretty basic one. The first thing to do in order to use Vue.js is to import it. If you follow the official guide and use an inline template for your component, you will get a blank page.

import Vue from 'vue';
var vm = new Vue({
  el: '#vm',
  template: '<div>Hello World</div>',
});

boilerplate.js

Note that this issue doesn’t occur when you define templates with the render function or SFC (Single File Component).

Actually, there are many Vue builds. The default build exported by the NPM package is the runtime-only build. It doesn’t bring the template compiler.

For some background information, the template compiler works exactly like JSX for React. It replaces template strings with function calls to create a Virtual DOM node.

// #1: import full build in JavaScript file
import Vue from 'vue/dist/vue.js';

// OR #2: make an alias in webpack configuration
config.resolve: {
  alias: { vue: 'vue/dist/vue.js' }
}

// OR #3: use render function directly
var vm = new Vue({
  el: '#vm',
  render: function(createElement) {
    return createElement('div', 'Hello world');
  }
});

template-compiler.js

With SFCs, this issue does not occur. Both vue-loader and vueify are tools used to handle SFCs. They generates plain JavaScript components using the render function to define the template.

To use string templates in components, use a full Vue.js build.

In summary, to fix this issue, specify the correct build during import, or make an alias for Vue in your bundler configuration.

You should note that using string templates reduces your app performance, because the compilation occurs at runtime.

There are many more ways to define a component template, so check out this article. Also, I recommend using the render function in Vue instance.

Keep property’s reactivity

If you use React, you probably know its reactivity relies on calling the setState function to update the value of properties.

Reactivity with Vue.js is a bit different. It’s based on proxying the component properties. Getter and setter functions will be overridden and will notify updates to the Virtual DOM.

var vm = new Vue({
  el: '#vm',
  template: `<div>{{ item.count }}<input type="button" value="Click" @click="updateCount"/></div>`,
  data: {
    item: {}
  },
  beforeMount () {
    this.$data.item.count = 0;
  },
  methods: {
    updateCount () {
      // JavaScript object is updated but
      // the component template is not rendered again
      this.$data.item.count++;
    }
  }
});

broken-reactivity.js

In the code snippet above, the Vue instance has a property called item (defined in data). This property contains an empty literal object.

During the component initialization, Vue creates a proxy under the get and set functions attached to the item property. Thus, the framework will watch value changes and eventually react.

However, the count property isn’t reactive, because it wasn’t declared at initialization time.

Actually, proxifying only occurs at component initialization time, and thebeforeMount lifecycle function triggers later.

Besides, the item setter isn’t called during count definition. So the proxy won’t trigger and the count property will have no watch.

beforeMount () {
  // #1: Call parent setter
  // item setter is called so proxifying is propaged
  this.$data.item = {
    count: 0
  };
  
  // OR #2: explicitly ask for watching
  // item.count got its getter and setter proxyfied
  this.$set(this.$data.item, 'count', 0);
  
  // "Short-hand" for:
  Vue.set(this.$data.item, 'count', 0);
}

fixed-reactivity.js

If you keep the item.count affectation in beforeMount, calling Vue.set later won’t create a watch.

The exact same issue also occurs with arrays when using direct affection on unknown indexes. In such cases, you should prefer array proxifyed functions such as push and slice.

Also, you can read this article from the Vue.js Developer’s website.

Be careful with SFC exports

You can use Vue regularly in JavaScript files, but you can also use Single File Components. It helps to gather JavaScript, HTML, and CSS code in a single file.

With SFCs, the component code is the script tag of a .vue file. Still written in JavaScript, it has to export the component.

There are many ways to export a variable/component. Often, we use either direct, named, or default exports. Named exports will prevent users from renaming the component. It will also be eligible for tree-shaking.

/* File: user.vue */
<template>
  <div>{{ user.name }}</div>
</template>

<script>
  const User = {
    data: () => ({
      user: {
        name: 'John Doe'
      }
    })
  };
  export User; // Not work
  export default User; // Works
</script>

/* File: app.js */
import {User} from 'user.vue'; // Not work
import User from 'user.vue'; // Works (".vue" is required)

sfc-export.js

Using named exports is not compatible with SFCs, be mindful about this!

In summary, exporting a named variable by default might be a good idea. This way, you will get more explicit debug messages.

Don’t mix SFC components

Putting code, template, and style together is a good idea. Besides, depending on your constraints and opinions, you may want to keep the separation of concerns.

As described in the Vue documentation, it’s compatible with SFC.

Afterward, one idea came to my mind. Use the same JavaScript code and include it in different templates. You may point it as a bad practice, but it keeps things simple.

For instance, a component can have both read-only and read-write mode and keep the same implementation.

/* File: user.js */
const User = {
  data: () => ({
    user: {
      name: 'John Doe'
    }
  })
};
export default User;

/* File: user-read-only.vue */
<template><div>{{ user.name }}</div></template>
<script src="./user.js"></script>

/* File: user-read-write.vue */
<template><input v-model="user.name"/></template>
<script src="./user.js"></script>

sfc-mix.js

In this snippet, both read-only and read-write templates use the same JavaScript user component.

Once you import both components, you will figure out that it doesn’t work as expected.

// The last import wins
import UserReadWrite from './user-read-write.vue';
import UserReadOnly from './user-read-only.vue';

Vue.component('UserReadOnly', UserReadOnly);
Vue.component('UserReadWrite', UserReadWrite);

// Renders two times a UserReadOnly
var vm = new Vue({
  el: '#vm',
  template: `<div><UserReadOnly/><UserReadWrite/></div>`
});

sfc-mix-import.js

The component defined in user.js can only be used in a single SFC. Otherwise, the last imported SFC which uses it will override the previous.

SFCs allow splitting code in separate files. But you can’t import thoses files in multiple Vue components.

To make it simple, don’t reuse JavaScript component code in multiple SFC components. The separate code feature is a handy syntax, not a design pattern.

Thanks for reading, hope my experience has been useful to make you avoid the mistakes I made.

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What are the differences between the various JavaScript frameworks? E.g. Vue.js, Angular.js, React.js

What are the differences? Do they each have specific use contexts?

What are the differences? Do they each have specific use contexts?

Ember.js vs Vue.js - Which is JavaScript Framework Works Better for You

Ember.js vs Vue.js - Which is JavaScript Framework Works Better for You

In this article we will discuss full details and comparison of both Ember.js and Vue.js

JavaScript was initially created to work for web applications. But today they have become the favorite of mobile app developers. Most of the developers prefer to work with frameworks based on JavaScript. It simplifies coding. You can use JavaScript with almost any framework.

The use of a particular framework will decide how easy and fast it is to create the app. So, you must choose the best one suited for the app that you are planning to build. You must make a wise choice so that you benefit in the end. Among the crowded market, two of the frameworks stand out. We will make a comparison between Ember.js and Vue.js.

Why Do You Select A Particular Framework?

Before we start comparing the two frameworks, we should understand the factors that lead to the choice of a framework. Each developer chooses a framework before he or she goes to work on an app. Let us see the reasons for the selection.

● The codes must be easy to understand and transparent.

● The framework should give the maximum power with the least amount of coding.

● The framework should provide a well laid out structure to work on.

● Does the framework support an in-built router or an external plug-in router?

● The framework should be able to transfer more data on a full page-load so that it becomes a single-page app. A single-page app is more beneficial for the application.

● In single page architectures if there is a need for users to share links to sub-screens within the interface, then the framework should have the capacity to route based on the URL.

● A tighter template option can help in enabling two-way binding.

● The framework should not conflict any third-party library.

● Testing the codes inside the framework should be easy.

● The framework should provide the HTTP client service for AJAX calls

● The documentation is essential. It should be complete and up-to-date.

● The framework should be compatible with the latest version of the browser.

● The framework has to fulfill the above conditions for easy construction of the app. You must ensure that the framework you choose meets the conditions.

Vue.js Explained

Developers are always looking at new frameworks to build their apps. The main requirements are speed and low cost. The framework should be easy to use by even new developers. You should be able to use it at low cost. Other considerations are about simple coding, proper documentation, etc.

Vue.js combines a lot of good when it comes to software language for web app development. The architecture of Vue.js is easy to put in use. The apps developed using Vue.js are easy to integrate with new apps.

Vue.js is a very lightweight framework. It makes it fast to download. It is also much faster than other frameworks. The single-file component nature of the framework is also beneficial. The size has made it very popular.

You can further decrease weight. With Vue.js you can separate the template-to-virtual DOM and compiler. You can only deploy the minified and zipped interpreter which is only 12 KB. You can compile the templates in your machine.

Another significant advantage of Vue.js is that it can integrate easily with existing applications created with JavaScript. It will make it easy for using this framework to make changes to applications already present.

Vue.js also integrates easily with other front-end libraries. You can plug in another library and make up for any deficiency in this framework. This feature makes this tool a versatile one.

Vue.js uses the method of rendering on the streaming-side server. You can render your component and get a readable stream. You can then send this to the HTTP server. It makes the server highly responsive. Your users will get the rendered content very quickly.

Vue.js is very SEO friendly. As the framework supports server-side rendering, the views are rendered directly on the server. The search engines list these.

But the most important thing for you is the ease with which you can learn Vue.js. The structure is elementary. Even new developers will find it easy to use it to build their apps. This framework helps in developing both small and large templates. It helps to save a lot of time.

You can go back and check your errors very easily. You can travel back and inspect all the states apart from testing your components. It is another important feature as far as any developer is concerned.

Vue.js also has very detailed documentation. It helps in writing your applications very quickly. You can build a web page or app with the basic knowledge of HTML or JavaScript.

● Vue.js has pure architecture. It helps in integration with other apps

● Vue.js is lightweight and fast. It can be made lighter by deploying only the interpreter

● You can separate the compiler and the template-to-virtual DOM.

● Due to smooth integration, you can use this to make changes to existing apps

● To make up for any shortfall, you can plug-in any library and makeup.

● As Vue.js uses streaming-side server rendering, your users can get quick responses.

● The server-side rendering also helps in being ranked higher by search engines.

● It has a simple structure. Easy to use for any new developer

● You can go back and check and correct your errors.

● You can check all the existing states.

● Detail documentation also helps build the web page or application very quickly.

Ember.js Decoded

Ember.js is an MVVM model framework. It is open-source software. This platform is mostly used for creating complex multi-page applications. It maintains up-to-date features without discarding any of the old features.

With this framework, you have to follow the architecture of the framework strictly. The JS framework is very tightly organized. It reduces the flexibility that other frameworks might offer.

There is a very refined and developed control system for its platforms and tools. You can integrate it with the new version with the tools provided. There is strict guidance about avoiding outdated APIs.

You can understand Ember’s APIs easily. They are also easy to work. You can make use of highly complex functionalities simply and straightforwardly.

The performance is better as similar jobs are processed together. It creates batches of similar bindings and DOM updates to improve the performance. It means that the browser needs to process them in one go. It will avoid recomputing for each task, wasting a lot of time.

You can write the codes in a simple manner and modules. You can use any of Ember’s APIs. It is possible due to the presence of Promises everywhere.

Ember comes with a well-written guide. The API is recorded in a useful manner. It is a front-end framework that is loaded. Ember has a router, pipeline, services, etc. of its own.

The basis for views, controllers, models, and framework is the Ember Object Model. All components come from the same objects. The framework is firm and steady. The reason is that all elements have similar jobs and characteristics.

Ember has made the general application, organization, and structure clear so that you don’t make any mistakes. You will have no chance to complicate the application unnecessarily. If you have to go out of the defined limits, you will have to force your way out.

The language used for templating in Embers is Handlebars. This language helps Embers to keep its logic out of view. The clean syntax of Handlebars makes it easy for you to read and understand the templates. Handlebar templates are faster to load.

Another advantage you gain from Handlebar is that you don’t have to update your template every time you add or remove data from the page. It will be done automatically by the language itself.

A community that is continually improving the framework supports Ember. They are updating the framework with the latest technology. They also make sure that backward compatibility is possible.

● Ember.js is an open-source MVVM model framework suitable for complex multiple-page applications.

● It offers both the latest and old features.

● It has a very tightly structured framework which doesn’t offer much flexibility

● A very refined control system helps you to integrate with new versions without any problem.

● There is strict guidance about avoiding outdated API versions.

● Ember’s APIs help you to use complex functionalities in a simple manner

● There is no recomputing for each task as the framework allows the browser to do similar functions together.

● Promises allow you to write modular and straightforward code using any API of Ember.js.

● Ember.js is a fully loaded, front-end framework.

● The framework is stable because all components have the same functionalities and properties.

● It has well-defined limitations which will prevent your complicating your application

● Handlebars, the language used by Ember.js allows you to read and understand templates easily. It also helps to load the templates faster.

● Handlebars will ensure to update the template every time you add or remove data.

● Ember.js has an active community that updates the framework regularly and facilitates backward compatibility.

A Comparison Between Ember.js And Vue.js

This article intends to compare the features of both frameworks. Let us see how the characteristics of these frameworks compare. It will help you to make use of the right framework for your web application.

When you need a modern engine for an old application, it is Vue.js which will help you. It combines the best properties of other frameworks. Vue.js is a developing framework. A ready-to-use library of interface elements does not exist. However, many third-party libraries can help you.

Ember.js offers you a well-organized and trustworthy framework. When the development team is big, this is the framework that suits best. It allows everyone to understand the written code and contribute to a common project. The technology will be up-to-date, and the platform will be stable.

Vue.js can help you use the syntax of different kinds. It helps in writing the codes with ease. It is also an SEO friendly framework. Ember is a fully loaded front-end framework and can help you develop the applications very fast. But it is not suitable for developing small projects.

It is not easy to say this is better than that. It will depend on what kind of project you have undertaken. Both have their pluses and minuses. The below table will help in a better comparison.

Final Thoughts

It is not easy to conclude as to which is better. It all depends on the application that you want to develop. Both frameworks are developing. Both are getting updates. Both the communities are working on the frameworks.

While Vue.js is more comfortable for writing codes, Ember is a full-stack framework allowing the development of apps very fast. It is suitable for big projects. It is too complicated to be used for smaller projects.

We hope you had a great time reading this article. If you’ve any questions or suggestions related to this blog, then feel free to ask them in the comment section. Thank You.!