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QR Code Generator using HTML, CSS and jQuery

  • Last Updated : 03 Aug, 2021

A QR code generator is an application that stores any required textual data into a QR code which can be later scanned with a QR code scanner to reveal the stored information. This QR Code can be used anywhere, for example, on a poster or website to allow users to get additional information. This application will allow the user to type in the data required and save it a PNG or SVG image of the QR code. 

Approach: To generate the QR code, we will use the Google Charts API. Using jQuery, the QR code image to be displayed is updated according to the image returned by the API.

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The API endpoint that would be used is given below.

https://chart.googleapis.com/chart?chs=150×150&cht=qr&chl=Hello%20world



Explanation of the URL:

  • The root URL for Google Chart Infographics is https://chart.googleapis.com/chart. This can be specified with the required parameters to ger the desired output.
  • The chs parameter denotes the size of the QR code image in pixels.
  • The cht parameter denotes the type of the image to be created. The value “qr” will be used to generate a QR Code.
  • The chl parameter denotes the text or URL data to be encoded in the QR code.

Example:

HTML




<!DOCTYPE html>
<html>
  
<head>
  <!-- Include Bootstrap for styling -->
  <link rel="stylesheet" href=
  
  <style>
    .qr-code {
      max-width: 200px;
      margin: 10px;
    }
  </style>
  
  <title>QR Code Generator</title>
</head>
  
<body>
  <div class="container-fluid">
    <div class="text-center">
  
      <!-- Get a Placeholder image initially,
       this will change according to the
       data entered later -->
      <img src=
        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">
          Content:
        </label>
        <div class="col-sm-10">
  
          <!-- Input box to enter the 
              required data -->
          <input type="text" size="60" 
            maxlength="60" class="form-control"
            id="content" placeholder="Enter content" />
        </div>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
  
          <!-- Button to generate QR Code for
           the entered data -->
          <button type="button" class=
            "btn btn-default" id="generate">
            Generate
          </button>
        </div>
      </div>
    </div>
  </div>
  <script src=
  </script>
  
  <script>
    // Function to HTML encode the text
    // This creates a new hidden element,
    // inserts the given text into it 
    // and outputs it out as HTML
    function htmlEncode(value) {
      return $('<div/>').text(value)
        .html();
    }
  
    $(function () {
  
      // Specify an onclick function
      // for the generate button
      $('#generate').click(function () {
  
        // Generate the link that would be
        // used to generate the QR Code
        // with the given data 
        let finalURL =
          htmlEncode($('#content').val()) +
          '&chs=160x160&chld=L|0'
  
        // Replace the src of the image with
        // the QR code image
        $('.qr-code').attr('src', finalURL);
      });
    });
  </script>
</body>
  
</html>

Output:

jQuery is an open source JavaScript library that simplifies the interactions between an HTML/CSS document, It is widely famous with it’s philosophy of “Write less, do more”.
You can learn jQuery from the ground up by following this jQuery Tutorial and jQuery Examples.




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