Getting started with Vue.JS – Step by Step

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Vue.JS is no. 1 trending Frontend technology on Github. I have been programming in Vue.JS for more than a year now.

In this post, I will guide you on how to get started with Vue.JS

What exactly is VueJS

In simplest words, Vue.JS is a frontend library to build Javascript applications. It helps you to build the frontend of web-apps. You can build a wide range of apps using Vue.JS from your next side-project to an enterprise-grade app using Vue.JS.

Prerequisites

Before getting started with Vue.JS, you should have Node.JS and NPM installed on your machine. Also, you should know the basics of HTML, CSS, and Javascript to get started with Vue.JS.

You don’t need to be a Javascript Ninja before jumping on to Vue.

First Vue App

Vue is designed to be incrementally adoptable. It means you can use it in any frontend app you have currently.

Step 1: Write HTML Markup

Write a basic HTML page where you want to attach the Vue Instance (Vue Instance is essentially a Vue App)

step_1-for-Vue-HTML-Markup.png

Step 2: Add Vue.JS from CDN

Now you need to include Vue.JS from CDN.

You just include this line inside the head tag.

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

Step 3: Add Vue Instance

The next step is to initiate a Vue Instance using the new Vue. Here is how you do it.

step-3-Initiate-Vue-Instance.png

Here you see the Vue constructor takes an object as a parameter. We have passed 2 properties to that object:

  1. el: HTML id of the element where you want to inject the Vue App.

  2. data: JSON Object which can be used as the Model/Data of the app. This is optional.

Step 4: Check 2-way data binding.

If you are from Angular Background or React.JS background, then you might be familiar with the concept.

If you are not, then in simple words, 2-way data binding is the way there is communication between the model (data object) and the view template (HTML element with id app)

Now, let’s add a property called message to the data object and print it in paragraph tag inside the HTML.

You can access the data’s properties using double curly braces syntax (i.e. {{message}} to access data.message).

Please check this code

step-4-2-way-data-binding-in-Vue.JS.png

You’ll probably see output like this

first-vue-app.png

It means, everything is set up and your first Vue app is working.

Please reach out to me if you are stuck somewhere.

Make sure you follow the steps closely.

Step 5: Add Input element and v-model

Now let’s try to make things a little more interesting. Let’s add an input field and bind that with message property. Here’s what you need to add in place of an earlier paragraph tag.

<div id="app">
    <p> {{message}}</p>
      <input type="text" v-model="message" placeholder="Type something.." />
</div>

Here I have created a simple div and made it as a root of the Vue app (by assigning it id=” app”).

Also, I have added the message in a `

' tag.

Then I have added an input field of type text.

The most interesting addition is the v-model. This is the way to bind the value of input property with the model object (data object).

Here is the new complete code:

step-5-Bind-Input-field-with-v-model.png

Now try and change the value of the text field.

Here is my output.

v-bind-output.png

Getting Started using CLI

Once you are up and running with some basic syntax of VueJS. You can start the real-world projects using Vue’s Official CLI. In this section, you will be introduced to some more advanced

Here are the steps you would need to follow.

Step 1: Install Vue CLI

This is straight from Vue CLI’s official document.

npm install -g @vue/cli @vue/cli-service-global

# or
yarn global add @vue/cli @vue/cli-service-global

Step 2: Create a Vue Project

Once you have vue-cli installed then you can run the following command to initiate the brand new Vue project

vue create my-first-app

This will ask you a series of questions about your config choices. You can choose default for now.

Next, it will ask you to choose a dependency manager. You can pick either of the 2. Both are good, but I prefer npm.

npm-or-yarn.png

After this, vue-cli will initiate and install the dependencies.

Step 3: Run the project

Next just cd into the directory and run the project. You will get these instructions on CLI as well.

cd my-first-app && npm run serve

After the build completes you can view your starter project in your browser at URL localhost:8080

Step 4: Inspect the bootstrapped code

Next, I would suggest you open this directory in your favorite code editor. Mine is Visual Studio Code 🙂

I insist you understand the code of the following files.

i) public/index.html

ii) src/main.js

iii) src/App.vue

iv) src/components/HelloWorld.vue

Just play with the code and try to understand the basic structure. I would write more posts on this.

Conclusion

I have written this post for a complete newbie by removing most of the complexities. If you face any issue till now then please comment or leave me a Tweet @MohitSehgl

Happy Coding. Keep Shining 🙂

Originally posted on Appsyoda.com

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