Vue JS QR Code Reader

Summary

In this tutorial, Martin guides viewers on creating a QR code reader using Vue.js. The tutorial utilizes Bit for building, which is considered faster and more effective. Martin demonstrates how to clone a repository, install necessary node modules, and start a server. He then shows how to install a Vue QR code reader library and integrate it into the Vue component. The process includes writing Tailwind CSS for styling, handling errors, and using events like 'init' and 'decode' for functionality. The video also covers how to display error messages and decoded strings from the QR code. Additionally, Martin explains how to redirect users to URLs obtained from scanned QR codes and how to toggle the flashlight feature. The tutorial concludes with a call to action for viewers to explore the documentation for more features and to like and subscribe for more informative content.

Takeaways

• 🎓 **Vue.js Tutorial**: The video is a tutorial on creating a QR code reader using Vue.js.
• 🛠️ **Tool Preference**: The presenter prefers using Bit for building, considering it faster and more effective, but also mentions Vue CLI as an alternative.
• 📚 **Clone Repository**: The first step is to clone a repository using a provided URL, which can be done through the terminal with `git clone`.
• 💻 **Visual Studio Code**: The presenter uses Visual Studio Code (VS Code) as the text editor, which is recommended for viewers to download if they don't already have it.
• 📦 **Node Modules Installation**: After cloning, the presenter installs node modules from the package.json file using `npm install`.
• 🚀 **Server Start**: The development server is started with `npm run dev` to test if the setup works.
• 📱 **QR Code Reader Library**: A QR code reader library is installed, with specific instructions given for different versions of Vue.
• 🖼️ **Styling with Tailwind CSS**: Tailwind CSS is used for styling the application to improve its visual appearance.
• 🔍 **Error Handling**: The video demonstrates how to handle errors by using the `init` event and displaying error messages to the user.
• 🔗 **QR Code Decoding**: The QR code reader component is used to scan codes, with a `decode` event to capture and display the decoded string from the QR code.
• ↪️ **Redirecting URLs**: The decoded URL from the QR code can be used to redirect the user to a different page.
• 🔦 **Flashlight Feature**: The presenter shows how to toggle the flashlight (torch) on and off using the QR code reader's properties.

Q & A

What is the main topic of the tutorial?

The main topic of the tutorial is how to create a QR code reader using Vue.js.

Which text editor does Martin use for this tutorial?

Martin uses Visual Studio Code as his text editor for this tutorial.

How does one clone the repository for the tutorial?

To clone the repository, one needs to use the 'git clone' command followed by the URL of the repository.

What command is used to install the node modules?

The command used to install node modules is 'npm install'.

How do you start the server for testing?

The server is started for testing by typing 'npm run dev' or 'npm run development'.

Which library does Martin recommend for QR code reading functionality?

Martin recommends using a QR code reader library, the name of which he provides in the description.

What is the purpose of using the 'init' event?

The 'init' event is used to handle errors that may occur before the QR code reader component is loaded.

How can one display errors from the QR code reader component?

Errors can be displayed by creating a new variable for the error and then displaying it in the template using Vue.js syntax.

What event is used to get the decoded string from the QR code?

The 'decode' event is used to get the decoded string information from the QR code.

How can the decoded string from a QR code be used?

The decoded string can be used for various purposes, such as redirecting to a URL obtained from the QR code.

What property can be used to control the flashlight of the QR code reader?

The 'torch' property can be used to control the flashlight, with true for turning it on and false for turning it off.

How can viewers find more information or tutorials like this?

Viewers can find more information or similar tutorials by checking the documentation and subscribing to the channel for more content.

Outlines

00:00

😀 Introduction to Vue.js QR Code Reader Tutorial

In this tutorial, Martin introduces viewers to creating a QR code reader using Vue.js. He opts for Vite over Vue CLI for faster and more efficient development. The process begins with cloning a repository, installing necessary node modules, and setting up the server. Martin also guides on installing a QR code reader library, handling errors, and writing the initial code to integrate the QR code reader into the Vue component.

05:01

📚 Setting Up the QR Code Reader Component

The second paragraph delves into the technical setup of the QR code reader component. It covers appending the QR code stream component, displaying it within the template, and handling initialization events to manage potential errors. Martin demonstrates how to create a method for the 'init' event to catch and display errors, enhancing the user interface with error messages when the QR reader fails to load.

10:02

🔍 Scanning and Decoding QR Codes

In the third paragraph, Martin shifts the focus to the practical use of the QR code reader by addressing how to scan and decode QR codes. He explains the use of the 'decode' event to capture information from the QR code, creating a variable to store the decoded string, and updating the user interface to display it. Additionally, he touches on functionalities like redirecting to URLs extracted from QR codes and manipulating the flashlight for better scanning conditions.

15:07

💡 Flashlight Feature and Final Thoughts

The final paragraph covers the flashlight feature of the QR code reader, allowing users to toggle the torch on and off. Martin refers to the documentation for the necessary properties and demonstrates how to implement the flashlight functionality with a simple button click event. He concludes the tutorial by encouraging viewers to explore the documentation further and to like and subscribe for more content, wishing everyone a nice day.

Keywords

💡Vue.js

Vue.js is an open-source JavaScript framework for building user interfaces and single-page applications. It is designed to be incrementally adoptable and is used in the video to create a QR code reader application. Vue.js is central to the video's theme as it is the primary technology for the project.

💡QR Code Reader

A QR code reader is a software component that can scan and interpret QR codes, which are two-dimensional barcodes. In the video, the QR code reader is the main feature being developed using Vue.js and other libraries. It is used to demonstrate how to integrate such a feature into a web application.

💡Tailwind CSS

Tailwind CSS is a utility-first CSS framework for rapidly building custom user interfaces. It is used in the video to style the QR code reader application, providing a clean and responsive design. Tailwind CSS is significant for the video's content as it enhances the visual presentation of the application.

💡npm

npm stands for Node Package Manager, a package manager for the JavaScript programming language, designed to simplify the installation, sharing, and management of JavaScript libraries and tools. In the video, npm is used to install dependencies like Vue.js and the QR code reader library, which are necessary for the application's functionality.

💡Git Clone

Git Clone is a command used to copy a repository from a remote server to a local machine. In the video, Martin uses 'git clone' to download the source code for the tutorial from a URL, which is essential for setting up the development environment.

💡Visual Studio Code

Visual Studio Code is a free, open-source source-code editor developed by Microsoft. It supports various programming languages and is used in the video as the text editor for writing and editing the code for the QR code reader application. It is an example of the development tooling used in the video.

💡Package.json

Package.json is a configuration file in which you can specify information about your project and the dependencies it requires. In the video, the package.json file is used to list the project's dependencies, which are installed using npm install, a key step in the setup process.

💡Webcam

A webcam is a digital video camera that captures and sends images to a computer. In the context of the video, the webcam is used as the input device for the QR code reader to scan the QR codes. The video demonstrates how to handle webcam access and errors related to it.

💡Event Handling

Event handling is a programming concept where you listen for and respond to events, such as user actions or system notifications. In the video, event handling is used to manage the initialization of the QR code reader and to capture decoded information from scanned QR codes, which is a critical part of the application's functionality.

💡Redirection

Redirection in web development refers to the process of sending a user from one URL to another. In the video, after a QR code is scanned and its content is a URL, the application uses redirection to navigate the user to the URL obtained from the QR code, demonstrating a practical application of QR code scanning.

💡Flashlight (Torch)

The flashlight, also known as a torch, is a feature of many devices that produces light. In the context of the video, the flashlight is mentioned as a property that can be toggled on or off to assist in scanning QR codes in low-light conditions. This feature enhances the usability of the QR code reader in different environments.

Highlights

This tutorial shows how to create a QR code reader using Vue.js, which can be a useful tool for various applications.

Bit is used for building the project, as it is faster and more effective than other tools like Vue CLI.

The tutorial uses Vue 3 and Tailwind CSS for styling, which are modern and popular choices in the Vue ecosystem.

The project is cloned from a GitHub repository using the provided URL.

Visual Studio Code is recommended as the text editor for this tutorial, which can be downloaded for free.

Node modules are installed from the package.json file using npm install.

The server is started with npm run dev to test the application.

A QR code reader library is installed using npm install, with different commands depending on the Vue version.

The QR code reader component is imported and used in the Vue component.

The init event is used to handle errors before the component is loaded.

Errors are displayed in the template using a data property.

The decode event is used to get the decoded string from the QR code.

The decoded string is displayed in the template and can be used for further processing, like redirecting to a URL.

The torch property is used to enable or disable the flashlight on the device.

A button is added to toggle the flashlight on and off.

The tutorial provides a solid foundation for building a QR code reader with Vue.js, with room for further customization and features.

The Vue QR code reader can be expanded with additional functionality, as outlined in the documentation.

The tutorial is a helpful resource for learning how to integrate and use a QR code reader in a Vue.js application.

Transcripts

hello guys my name is martin and in this

tutorial i will show you how to create

cure reader using vue.js and in this

tutorial i will use meat for building

you can also use

view clear but i think bit is much

faster and much effective for building

and they will use youtube version but i

will show you how to create curator

using second version and tailwind css

i will use this package

for saving your time and saving my time

if you already installed

view clear or lead you can just skip to

this time

and

let's begin

first of all

we need to clone

this get i will leave this url in

description

and

we need to click code and

copy this url i will open my text editor

for text editing i use

i am using visual studio code

you can

download it for free

just type in google visual studio code

download

and what i need to do i need to open

folder

and

find

that folder

okay which name is tutorial okay

select folder

okay

in terminal i just

type

npm

oh sorry guys git clone

and paste url

wait a little bit

okay it's already downloaded now i need

to open

this folder

that we

cloned

yeah

now we need to install

node modules from our

package.json file by typing npm install

okay it's already installed

for testing

we need to start our server by typing

npm run dev

and pm run development okay

as you can see it's loading and i think

it's working

yeah it's working as you can see you can

click next page back home

and what we need to do now we need to

install a view qr code reader library

i will leave this url in description

uh we need to copy this name oh sorry

view

free

care reader

okay i think this one

yeah i need to copy this

name

and just open my text editor

and

type npm install

and paste that name if you're using

second version second version of view

you need to type without free like that

but i'm using a third version i will

type like that

okay it's already installed

now guys we need to write some code

i will go to this folder in

and i'll put my code in home page

i will delete this

and

this

now it looks very clean

i will write some

tailwind code to

a better look

like that

i just made

some padding from

left and right

now we need to

write some code

now we need to import our qr

code reader to this component

and how we can do that

we will use qr code stream component

and just

write some javascript

okay

import

the name of component and from view

of

new

qr code reader if you're using secondary

version

you need to write without free like i

said before when you was installing this

library

now we need to append this component and

our components

components

and qr

code stream

now what we need to do we need to

display this component in our view in

our template and

we need to find the name of component

okay

qr code stream

like that

and i just compile the the c3s ctrl s

and

let's see what's happening

okay nothing happened as you can see

i will inspect why it's like that

and we got some errors yeah we got some

error uh could not start with your

source uh this is because i'm using my

webcam

but we need to

display some errors

that will save what's problem that

reader is not loading

how we can do that

we need to call event

and

events we can find in

api reference

okay

okay we see events we have decode

we will use this event later

detect and this sorry i don't

i'm not we'll use this event

in it now we need to

use init event

okay

for using event we need to

put this symbol and write in it

equals

and

you need to write method name i will

name it on init

and we need to create method in our

methods

which name will be on init

as we write

before and we will get some information

promise

and it is called then

before

this component is loaded

okay

we need to get some error names

okay

as you can see we have this try and

catch error we can just copy that

for saving your time and saving my time

okay

just

some better look

okay

now we have t servers

and what we need to do we need to

display these errors first of all we

need to create

a new variable

and our data

okay

return

and

which name will be error

and i will we have empty string right

now

we need to

set

up for our error some value okay we need

to

do like oh sorry guys

i will make it in smarter way

okay

this

error

equals

like that

okay like that

now we have our error

and we need to display it in our

template

okay we can just put it in our paragraph

and type error

okay

let's

compile this

server

and let's try again nothing happened

why we didn't got any errors

let's see our console

unexpected reserved word

really

okay somewhere i made a mistake

error

on init

data error

components

fine

on init

okay

like

that i think

it will work

okay let's try again

okay it's working

but we got some error maybe camera is

already in use yeah as you can see i'm

using i am using my camera

and i need to turn off for

this qr code that view

okay let's try again

restart

and

now my camera is loaded as you can see

let's try qr code

i need to find my qr code

in my phone

okay somewhere

okay i found it

now let's try to scan it as you can see

it's scanning but nothing

happening

uh we need to use uh

one more event

uh which name is decode

equals and our method name will be on

the code

and i will copy that name

and we will

get some

information

we will get a

decoded string

information from our qr code

and

i need to create

one more variable

which name will be

decoded string

okay i will empty string

like that and i will set value for this

decoded string to

decoded string from

qr code component and let's say

let's try is working or not

okay nothing happening because i didn't

display

this

on the decoded

variable

in template

let's try to put it in our paragraph uh

decoded string let's try again just save

okay as you can see it's already working

i'll restart this and now as you can see

we got some url from

our qr code

what we can do with this url we can

redirect it to other page like other

if you want to redirect you can just

type window

location

replace

and just

use

the coded string

and i will commend this line knowing i

don't need it

and let's try again

okay as you can see it's redirecting and

we are redirected to

this url

and what we can do more with

with this component we

can

we can use

flashlight we can turn off and turn on

flashlight

i need to go to documentation and as you

can see we have properties yeah we need

to use properties we have track property

and we have camera property to turn on

okay to change camera

and

and we have torch property we will use

torch property for

flashlight to turn on and turn off

if we type

we need to pass a boolean true or false

false means flashlight off and true

means

flashlight on

now what we need to do we need to

write

that property

torch equals

i'll name it

torch

okay need to create torch variable

torch equals false right now i will

leave it false

flashlight off and i

i will make button for

turn off or turn on flashlight

button

we call event click

and on click we can

change torch to

negative

torch

if torch is

true

will be changed to false or if torches

false will be changed to true

okay

let's try

okay

this is not home page

okay

yeah

i

didn't put any name for button

any variable

okay how we can name it um to

turn

turn on

off

flash

light

okay like that

and let's try again

as you can see nothing happening because

i don't have flashlight in my computer

if you will use your phone it will

work

yeah guys

this is everything what you can do

you also can see more

things in

this documentation

and

if you want to see more

tutorials like this you can click

like and subscribe

and have a nice day