Unlocking Vue.js: Your Guide from Installation to Advanced State Management

How Vue.js Application Renders?

Vue.js utilizes virtual DOM, which is a memory-based replica of the actual DOM. This virtual representation stays synchronized with the real DOM, ensuring efficient and optimized rendering of the user interface.

Related read: React Virtual Dom vs. Real Dom

Here is the rendering pipeline:

1. Compile: Vue.js components are compiled into a render function, which then generates virtual DOM trees.

2. Mount: The runtime render function is responsible for executing the rendering process. It operates by traversing the virtual DOM and creating corresponding nodes in the actual DOM based on its structure and properties.

3. Patch: The runtime render function is responsible for walking through the new DOM tree and comparing it to the old one. It identifies any updates or new nodes in the DOM and applies them accordingly.

Template Syntax in Vue.js

Vue.js utilizes a template syntax based on HTML, which provides a seamless integration between HTML and JavaScript. The templates are diligently compiled by Vue, resulting in the generation of remarkably optimized JavaScript code. This proficiently enhances the performance of the application. Below are various approaches available for the template syntax;

Text Interpolation

Text interpolation in Vue.js is achieved by using double curly braces “{{ }}”. You can place variables or data inside these braces to dynamically display their values in the HTML template. For example, if you have a variable ‘message’ in your Vue component, you can display it in the template as ‘{{ message }}’, and Vue will automatically update the content whenever the ‘message’ changes.

Raw HTML

Vue.js allows you to render raw HTML content using the ‘v-html’ directive. This is useful when you want to inject HTML from a data property or computed property into your template. Be careful when using ‘v-html’ as it can pose security issues if the content comes from untrusted sources.

Attribute Bindings

Vue enables you to bind HTML attributes to data properties or expressions using directives like ‘v-bind’ or simply ‘:’ followed by the attribute name. This is handy for dynamically setting attributes like ‘src’, ‘href’, ‘class’, and more. For instance, to bind the ‘href’ attribute of a link to a variable ‘linkUrl’, you would use ‘v-bind:hrf= “linkUrl” or the shorthand ‘:href: “linkUrl”’.

Using JavaScript Expression

Vue.js templates allow you to use JavaScript expressions within double curly braces ‘{{ }}’. These expressions can include simple operations, calculations, and function calls. For example, you can do something like ‘{{ count * 2}}’ to display the result of ‘count’ multiplied by 2 in your template.

Directives

Vue.js provides a set of custom directives prefixed with ‘v-’ that you can use to add special behavior to your HTML elements. For example, ‘v-for’ is used for rendering lists, ‘v-if’ for conditional rendering, ‘v-on’ or ‘@’ for event handling, and ‘v-model’ for two-way data binding to form elements. Directives improve the abilities of your templates and allow you to create dynamic and interactive web applications.

Reactivity Fundamentals

ref() Example

import { ref } from 'vue'
const count = ref(0)

console.log(count) // {value : 0}
console.log(count.value) // 0

console.value++
console.log(count.value) // 1

setup() Example

<script>
import { ref } from 'vue'

export default {
setup() {
const count = ref(0)

// expose to template and other options API hooks
return {
count
}
},

mounted() {
console.log(this.count) // 0
}
}
</script>

<template>
<button @click="count++">{{ count }}</button>
</template>

What is State Management?

State management is an imperative aspect of software development, encompassing the meticulous handling of data that accurately represents the state of a software application at any given instance. This concept holds the utmost significance, particularly in the realm of intricate applications such as web applications, mobile apps, and desktop software. The effectiveness of state management directly contributes to the creation of robust, easily maintainable, and highly scalable applications.

Simple State Management with Reactivity API

The most effective approach for sharing the state is to generate a reactive object by utilizing the reactive () method. Subsequently, proceed to import the aforementioned object into numerous components.

DEMO

Watch our enlightening Vue.js video to level up your knowledge ⬇️