How to build a real-time editable data table in Vue.js

How to build a real-time editable data table in Vue.js

Read along as we build a real-time editable data table with Kendo UI for Vue and Hamoni Sync. Building responsive Vue apps just got bette

In data-driven applications, a data table is used to display data in a tabular format with the ability to edit and delete records in place. When you’re working with Vue, there are different open-sourced components that can be used to easily add a data table to your application.

Many applications today have real-time features, and you may wonder how you can synchronize editing and deleting data in real-time. There are three options for this:

  1. Use WebSocket API. This is not a good option if some of your users are using browsers that don’t yet support WebSocket.
  2. Use a library that abstracts away these cross-browser differences with a fallback mechanism, such as Socket.IO, SignalR, and SockJS. With this option, you’d have to manage the server that handles a large number of open connections and deal with scaling.
  3. Use a service that provides a library that does the same thing as the previous option, but manages the server and scales appropriately. This is a preferable option for companies and teams that are adopting (or have adopted) the serverless approach.

I’ll show you how to build a real-time editable data table in Vue.js using Hamoni Sync as the real-time state synchronisation service. The picture below shows what we’ll build:

To follow along, you’ll need to have some basic knowledge of Vue. If you have no knowledge of Vue, you can read my previous post to get up to speed with Vue.js. You’ll also need the following tools:

  1. Node.js & npm (follow the link to download an installer for your OS)
  2. Vue CLI to scaffold a new Vue project. If you don’t have this, run npm install -g [[email protected]](/cdn-cgi/l/email-protection) from the command line to install it.

Set up the project

We’ll set up the project using the Vue CLI and a template from Vuetify. Open the command line and run the command vue init vuetifyjs/simple realtime-datatable-vue. You'll get asked for a name and an author, so accept the default value by hitting enter for each prompt. This will scaffold a new Vue project with a single index.html file.

This file contains script references to Vue and Vuetify. Vuetify is a Material Design Component for Vue.js. It has a v-data-table component with features for sorting, searching, pagination, inline-editing, header tooltips, and row selection.

Add the data table component

Open the file index.html with your text editor (or IDE). Replace the content on line 50 with the following:

<div>    <v-dialog v-model="dialog" max-width="500px">    <v-btn slot="activator" color="primary" dark class="mb-2">New Item</v-btn>    <v-card>        <v-card-title>        <span class="headline">{{ formTitle }}</span>        </v-card-title>        <v-card-text>        <v-container grid-list-md>            <v-layout wrap>            <v-flex xs12 sm6 md4>                <v-text-field v-model="editedItem.name" label="Dessert name"></v-text-field>            </v-flex>            <v-flex xs12 sm6 md4>                <v-text-field v-model="editedItem.calories" label="Calories"></v-text-field>            </v-flex>            <v-flex xs12 sm6 md4>                <v-text-field v-model="editedItem.fat" label="Fat (g)"></v-text-field>            </v-flex>            <v-flex xs12 sm6 md4>                <v-text-field v-model="editedItem.carbs" label="Carbs (g)"></v-text-field>            </v-flex>            <v-flex xs12 sm6 md4>                <v-text-field v-model="editedItem.protein" label="Protein (g)"></v-text-field>            </v-flex>            </v-layout>        </v-container>        </v-card-text>        <v-card-actions>        <v-spacer></v-spacer>        <v-btn color="blue darken-1" flat @click.native="close">Cancel</v-btn>        <v-btn color="blue darken-1" flat @click.native="save">Save</v-btn>        </v-card-actions>    </v-card>    </v-dialog>    <v-data-table :headers="headers" :items="desserts" hide-actions class="elevation-1">    <template slot="items" slot-scope="props">        <td>{{ props.item.name }}</td>        <td class="text-xs-right">{{ props.item.calories }}</td>        <td class="text-xs-right">{{ props.item.fat }}</td>        <td class="text-xs-right">{{ props.item.carbs }}</td>        <td class="text-xs-right">{{ props.item.protein }}</td>        <td class="justify-center layout px-0">        <v-btn icon class="mx-0" @click="editItem(props.item)">            <v-icon color="teal">edit</v-icon>        </v-btn>        <v-btn icon class="mx-0" @click="deleteItem(props.item)">            <v-icon color="pink">delete</v-icon>        </v-btn>        </td>    </template>    </v-data-table></div>

The code above adds a v-dialog component for displaying a dialog to collect data for new records or edit an existing record. Also, it adds the v-data-table which renders the table. We need to define the data and methods used by these components. After line 126, add the following code to the data properties:

dialog: false,headers: [    {        text: 'Dessert (100g serving)',        align: 'left',        sortable: false,        value: 'name'    },    { text: 'Calories', value: 'calories' },    { text: 'Fat (g)', value: 'fat' },    { text: 'Carbs (g)', value: 'carbs' },    { text: 'Protein (g)', value: 'protein' },    { text: 'Actions', value: 'name', sortable: false }],desserts: [],editedIndex: -1,editedItem: {    name: '',    calories: 0,    fat: 0,    carbs: 0,    protein: 0},defaultItem: {    name: '',    calories: 0,    fat: 0,    carbs: 0,    protein: 0},listPrimitive: null

The desserts data property will hold the data to be displayed in the table. The editedItem property will hold values for the record being edited, and the editedIndex will hold the index of the record being edited.

Add the following properties after the data property definition, after line 189:

computed: {    formTitle() {        return this.editedIndex === -1 ? 'New Item' : 'Edit Item'    }},
watch: {    dialog(val) {        val || this.close()    }},

We added a computed and watch property. The computed property defines formTitle which gives the dialog component a title based on the value of editedIndex. The watch property watches dialog for when its value changes. If the value changes to false, it calls the function close() which will be defined later.

Add Hamoni Sync

At this junction we need to add Hamoni Sync. It is used to synchronise the application state, and handles conflict resolution to avoid one user overriding another user’s data. To use Hamoni Sync, you’ll have to sign up for an account and application ID. Follow these steps to create an application in Hamoni.

  1. Register and login to the Hamoni dashboard.
  2. Enter your preferred application name in the text field and click the create button. This should create the app and display it in the application list section.
  3. Click the button “Show Account ID” to see your account ID.

Below the script reference to Vuetify on line 139, add a reference to Hamoni Sync:

<script src="https://unpkg.com/[email protected]/hamoni.dev.js"><;/script>

Then we need to initialise Hamoni Sync once the Vue component is mounted. Add a mounted property below the watch property:

mounted: function () {    let hamoni = new Hamoni("ACCOUNT_ID", "APP_ID");
    hamoni.connect().then(() => {        hamoni          .get("vue-table")          .then(primitive => {            this.listPrimitive = primitive            this.desserts = [...primitive.getAll()]            this.subscribeToUpdate()          }).catch(error => {              if (error === "Error getting state from server") {                this.initialise(hamoni);              }              else {                 alert(error);              }          })    }).catch(alert)},

From the code above, we initialize Hamoni Sync with an account and application ID. Replace the string placeholders with the account and application ID from the dashboard. Then it is connected to the Hamoni server by calling hamoni.connect() which returns a promise.

Once connected, we call hamoni.get() with the name of the state stored in Hamoni. In order to retrieve a state from Hamoni, it needs to have been created, otherwise it'll return an error. What I've done here is handle this error within the catch block, such that it calls another function to initialize the state in Hamoni Sync.

If the call to get an application state succeeds, it returns an object which will be used to modify data contained in that state. This object is referred to as a Sync primitive. There are three types of Sync primitives:

  1. Value Primitive: This kind of state holds simple information represented with datatypes like string, boolean or numbers. It is best suited for cases such as unread message count, toggles, etc.
  2. Object Primitive: Object state represents states that can be modelled as a JavaScript object. An example usage could be storing the score of a game.
  3. List Primitive: This holds a list of state objects. A state object is a JavaScript object. You can update an item based on its index in the list.

We’ve used a list primitive for this example. We call primitive.getAll() to get the state and pass it to desserts. After that, it calls the function subscribeToUpdate(). This function will be used to subscribe to state change events from Hamoni Sync.

Add the following code after the mounted property on line 215:

methods: {  initialise(hamoni) {    hamoni.createList("vue-table", [      {        name: 'Frozen Yogurt',        calories: 159,        fat: 6.0,        carbs: 24,        protein: 4.0      },      {        name: 'Ice cream sandwich',        calories: 237,        fat: 9.0,        carbs: 37,        protein: 4.3      },      {        name: 'Eclair',        calories: 262,        fat: 16.0,        carbs: 23,        protein: 6.0      }    ]).then(primitive => {      this.listPrimitive = primitive      this.desserts = this.listPrimitive.getAll()      this.subscribeToUpdate();    }).catch(alert)  },
  subscribeToUpdate() {    this.listPrimitive.onItemAdded(item => {      this.desserts.push(item.value)    })
    this.listPrimitive.onItemUpdated(item => {      //update the item at item.index      this.desserts.splice(item.index, 1, item.value);    })
    this.listPrimitive.onItemDeleted(item => {      //remove the item at item.index      this.desserts.splice(item.index, 1);    })  },
  editItem(item) {    this.editedIndex = this.desserts.indexOf(item)    this.editedItem = Object.assign({}, item)    this.dialog = true  },
  deleteItem(item) {    const index = this.desserts.indexOf(item)    confirm('Are you sure you want to delete this item?') && this.listPrimitive.delete(index)  },
  close() {    this.dialog = false    setTimeout(() => {      this.editedItem = Object.assign({}, this.defaultItem)      this.editedIndex = -1    }, 300)  },
  save() {    if (this.editedIndex > -1) {      this.listPrimitive.update(this.editedIndex, this.editedItem)    } else {      this.listPrimitive.push(this.editedItem)    }
    this.close()  }}

The code above defines the functions we’ve been referencing thus far.

The initialise() function creates the list primitive with name as vue-table.

The subscribeToUpdate() functions contain code to handle when an item is added, updated, or deleted from the list primitive.

The deleteItem()function removes an item from the list primitive by calling listPrimitive.delete(index) with the index of the item to delete.

The save() function calls listPrimitive.push(editedItem) to add a new item to the list primitive, and calls listPrimitive.update(editedIndex, editedItem) to update the record at a certain index.

This is all the code that’s needed to achieve our objective of a real-time editable data table. Open the index.html file in your browser and the application is ready to use!

That’s A Wrap!

We’ve built a real-time editable data table in Vue.js. Hamoni Sync makes it easy to add real-time functionality. Both Vuetify and Hamoni Sync have npm packages if you’re working with a build system and using single file components. You can find the source code on GitHub.

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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.!