To read the data from a selected JSON file using an control in ASP.NET using jQuery, you can follow these steps:

 

To read the data from a selected JSON file using an <input type="file"> control in ASP.NET using jQuery, you can follow these steps:

1. 1. Create the HTML structure with the file input and a button to trigger the file reading:

<input type="file" id="file" /> <button id="readFile">Read File</button>

2. Add a script block that handles the file reading when the "Read File" button is clicked:

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

<script>

  $(document).ready(function() {

    $('#readFile').on('click', function() {

      // Get the file selected in the input control

      var file = $('#file')[0].files[0];

      if (file) {

        var reader = new FileReader();

        reader.onload = function(event) {

          var fileData = event.target.result;

          try {

            // Parse the JSON data from the file

            var jsonData = JSON.parse(fileData);

            // Now you have the JSON data in the 'jsonData' variable

            // You can process it as needed, e.g., display it on the page, send it to the server, etc.

            console.log(jsonData); // Display the JSON data in the browser console

          } catch (error) {

            console.error('Error parsing JSON data:', error);

          }

        };

        reader.readAsText(file);

      } else {

        alert('Please select a JSON file.');

      }

    });

  });

</script>

In this example, when the "Read File" button is clicked, the script reads the selected file using the FileReader API and then parses the JSON data from the file. The parsed JSON data is available in the jsonData variable, which you can process as needed.

Note that this code is intended to run on a client-side web application and doesn't involve server-side processing in ASP.NET. If you need to send the JSON data to the server for further processing, you can make an AJAX request to an ASP.NET endpoint with the parsed JSON data.