QR Code Generator using HTML, CSS, and jQuery

In this article, we will understand how to create a QR Code Generator using HTML, CSS, and jQuery with the help of various examples.

What is a QR Code generator?

QR Code Generator is a tool that is used to generate different types of QR Codes depending on the purpose, as we can create QR Codes to open a website, view a PDF file, listen to music, watch Youtube videos, store image files, connect to a WiFi network, etc. To generate a QR code, we should know the type of content you are using.

Following are the various examples of QR Code Generator using HTML, CSS and jQuery

Example 1:

  <! DOCTYPE html>  <html>  <head>    <meta charset = “UTF-8”>    <meta name = “viewport” content = “width=device-width, initial-scale=1.0”>    <meta http-equiv = “X-UA-Compatible” content = “ie=edge”>    <title> Example of QR Code Generator </title>  <link rel = “stylesheet” href=”https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css” />  <style>  .qr-code {  max-width: 200px;  margin: 10px;  }  body {    background-color: #555;    justify-content: center;    font-family: ‘VT323’, monospace;    font-size: 1.5rem;   color: black;    margin: 20px;     text-align: center;   }  h1 {    font-weight: normal;    font-size: 40px;    font-weight: normal;    text-transform: uppercase;    text-align: center;   }  h3 {   text-align: center;   color: #46a294;   font-size: 20px;   width: 100%;  margin: 15 15;   position: relative;   font-weight: 400;   }  h2 {   text-align: center;   color: #46a294;   font-size: 28px;   width: 100%;   margin: 10px 10;   position: relative;   line-height: 58px;   font-weight: 400;   }  h2:before {   content: ” “;   position: absolute;   left: 50%;   bottom: 0;   width: 100px;   height: 2px;  font-weight: bold;   background-color: #2079df;   margin-left: -50px;   }  button.center-block {    margin-top: 20px;    display: block;    width: 60%;    line-height: 2em;    background: rgba(114,212,202,1);    border-radius: 5px;    border: 0;    border-top: 1px solid #B2ECE6;    box-shadow: 0 0 0 1px #46A294, 0 2px 2px #808389;    color: #FFFFFF;    font-size: 1.5em;    text-align: center;    text-shadow: 0 1px 2px #21756A;  }  button.center-block:hover {   background: linear-gradient(to bottom, rgba(107,198,186,1) 0%,rgba(57,175,154,1) 100%);    }  button.center-block:active {    box-shadow: inset 0 0 5px #000;    background: linear-gradient(to bottom, rgba(57,175,154,1) 0%,rgba(107,198,186,1) 100%);   }  button.center-block:focus {      outline: none;      border-color: green;  }  </style>  </head>  <body>  <h1> Example </h1>  <h2> QR Code Generator </h2>  <div class = “container-fluid”>  <div class = “text-center”>  <img src =  “https://chart.googleapis.com/chart?cht=qr&chl=Hello+World&chs=160×160&chld=L|0”  class = “qr-code img-thumbnail img-responsive” />  </div>  <div class = “form-horizontal”>  <div class = “form-group”>  <label class = “control-label col-sm-2”  for = “content”>  <h3> Content: </h3>  </label>  <div class = “col-sm-10”>  <input type = “text” size = “60”  maxlength = “50” class = “form-control”  id = “content” placeholder = “Enter content” />  </div>  </div>  <div class = “form-group”>  <div class = “col-sm-offset-2 col-sm-10”>  <button type = “button” class =  “center-block” id = “generate”>  Generate  </button>  </div>  </div>  </div>  </div>  <script src =  “https://code.jquery.com/jquery-3.5.1.js”>  </script>  <script>  function htmlEncode(value) {  return $(‘<div/>’).text(value)  .html();  }  $(function () {  $(‘#generate’).click(function () {  let finalURL =  ‘https://chart.googleapis.com/chart?cht=qr&chl=’ +  htmlEncode($(‘#content’).val()) +  ‘&chs=160×160&chld=L|0’  $(‘.qr-code’).attr(‘src’, finalURL);  });  });  </script>  </body>  </html>  

Explanation:

In the above example, we have created a QR code by passing a value in the content box. We have generated a QR code with a defined value in the content box.

Output:

Following is the output of this example.

Example 2:

  <! DOCTYPE html>  <html lang=”en”>  <head>    <meta charset = “UTF-8”>    <meta name = “viewport” content = “width=device-width, initial-scale=1.0”>    <meta http-equiv = “X-UA-Compatible” content = “ie=edge”>    <link href=”https://fonts.googleapis.com/css?family=Major+Mono+Display” rel = “stylesheet”>    <link rel = “stylesheet” href=”https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css”>    <script src = “https://cdnjs.cloudflare.com/ajax/libs/qrcode-generator/1.4.1/qrcode.js”> </script>    <script src = “https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js”> </script>    <script src = “https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js”> </script>    <link rel = “stylesheet” href=”https://use.fontawesome.com/releases/v5.6.1/css/all.css” integrity=”sha384-gfdkjb5BdAXd+lj+gudLWI+BXq4IuLW5IT+brZEZsLFm++aCMlF1V92rMkPaX4PP” crossorigin = “anonymous”>    <script src = “https://cdnjs.cloudflare.com/ajax/libs/jquery.qrcode/1.0/jquery.qrcode.min.js”> </script>    <script src = “https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js”> </script>    <title> QR generator Example </title>  </head>  <style>    #placeHolder {      display: none;    }  button.center-block {    margin-top: 20px;    display: block;    width: 60%;    line-height: 2em;    background: rgba(114,212,202,1);    border-radius: 5px;    border: 0;    border-top: 1px solid #B2ECE6;    box-shadow: 0 0 0 1px #46A294, 0 2px 2px #808389;    color: #FFFFFF;    font-size: 1.5em;    text-align: center;    text-shadow: 0 1px 2px #21756A;  }  button.center-block:hover {   background: linear-gradient(to bottom, rgba(107,198,186,1) 0%,rgba(57,175,154,1) 100%);    }  button.center-block:active {    box-shadow: inset 0 0 5px #000;    background: linear-gradient(to bottom, rgba(57,175,154,1) 0%,rgba(107,198,186,1) 100%);   }  button.center-block:focus {      outline: none;      border-color: green;  }    canvas {  width:200px;    }    #dBtn {      display: none;    }      h1#heading {      font-family: ‘Major Mono Display’, monospace;    }    body {    background-color: #555;    justify-content: center;    font-family: ‘VT323’, monospace;    font-size: 1.5rem;   color: black;    margin: 20px;     text-align: center;   }  h1 {    font-weight: normal;    font-size: 40px;    font-weight: normal;    text-transform: uppercase;    text-align: center;   }  h2 {   text-align: center;   color: #46a294;   font-size: 28px;   width: 100%;   margin: 10px 10;   position: relative;   line-height: 58px;   font-weight: 400;   }  h2:before {   content: ” “;   position: absolute;   left: 50%;   bottom: 0;   width: 100px;   height: 2px;  font-weight: bold;   background-color: #2079df;   margin-left: -50px;   }    </style>  <body>   <h1> Example </h1>  <h2> QR Code Generator </h2>    <div class = “container mx-auto w-75 py-4 border my-4 bg-light”>        <label for = “usr” class = “text-dark”> Enter Text: </label>        <input type = “text” class = “form-control” id = “text” name = “username” placeholder = “Enter Text Here”>        <a href=”../javascript:void(0)” class = “btn btn-primary btn-lg my-4” onclick = “generate();”> Generate </a>    </div>        <div class = “jumbotron mx-auto w-75 border my-4 py-4 text-center” id = “dBtn”>        <div id = “placeHolder”> </div>           <canvas id = “myCanvas”> </canvas>      <br>        <a href=”#” class = “btn btn-danger btn-lg” onclick = “downloadQrCode(this);” download = “QRcode.png” > Download </a>    </div>    <nav class = “navbar navbar-expand-sm bg-dark navbar-dark fixed-bottom p-1 “>       <ul class = “navbar-nav”>       <li class = “nav-item”>        <a class = “nav-link” href=”../javascript:void(0)”> All Rights Reserved 2022 </a>      </li>         </ul>      </nav>  <script>  function generate(){    var typeNumber = 4;    var errorCorrectionLevel = ‘L’;    var qr = qrcode(typeNumber, errorCorrectionLevel);    var inputText = document.getElementById(‘text’).value;    qr.addData(inputText);    qr.make();    document.getElementById(‘placeHolder’).innerHTML = qr.createImgTag();    canvasScreen();  }  downloadQrCode =function (el){    var canvas = document.getElementById(“myCanvas”);    var image = canvas.toDataURL(“image/png”);    el.href = image;  };  function canvasScreen() {    var a = document.getElementsByTagName(“img”)[0];    a.setAttribute(“id”,”qrcode”);      var canvas = document.getElementById(“myCanvas”);    var ctx = canvas.getContext(“2d”);    var img = document.getElementById(“qrcode”);    ctx.drawImage(img,70,0,150,150);  document.getElementById(“dBtn”).style.display = “block”;  }  </script>  </body>  </html>  

Explanation:

In the above example, we created a QR code by passing a value in the content box. With the use of defined value in the content box, we have generated a QR code, and after generating a QR code, we also have a downloading option. We can download a QR code as an image in your system. We can change the name of the image using the following code.

        <a href=”#” class = “btn btn-danger btn-lg” onclick = “downloadQrCode(this);” download = “QRcode.png” > Download </a>  

Output:

Following is the output of this example.

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