Javascript Programming Tutorials, Guides & Best Practices

$('#exampleTable').DataTable({
    "responsive": true,
    "processing": true,
    "serverSide": true,
    "ajax": {
        "url": "{{ route('fetchUserData') }}",
        "type": "GET",
        "error": function(xhr, status, errorThrown) {
            console.error("Error during AJAX request: ", errorThrown);
        },
        "dataSrc": function(response) {
            console.info("Data received from server: ", response);
            if (response.records && response.records.length) {
                console.info("Data entries loaded:");
                response.records.forEach(function(record) {
                    console.log(record);
                });
                return response.records;
            } else {
                console.warn("No records found.");
                return [];
            }
        }
    },
    "columns": [
        { "data": "username" },
        { "data": "points" },
        { "data": "followers" },
        { "data": "referrals" }
    ],
    "language": {
        "emptyTable": "No records to display" // Custom message for empty table
    },
    "initComplete": function() {
        $('div.dataTables_length select').addClass('form-select mt-1 w-full');
        $('div.dataTables_filter input').addClass('form-input block w-full mt-1');
    },
    "drawCallback": function() {
        $('table').addClass('min-w-full bg-gray-50');
        $('thead').addClass('bg-blue-100');
        $('thead th').addClass('py-3 px-5 text-left text-xs font-semibold text-gray-700 uppercase tracking-wide');
        $('tbody tr').addClass('border-t border-gray-300');
        $('tbody td').addClass('py-3 px-5 text-sm text-gray-800');
    }
});

This JavaScript code initializes a DataTables instance on an HTML table with the ID #exampleTable. It enhances the table with various features like responsiveness, server-side processing, AJAX data fetching, and custom styling.

When working with AJAX, it’s important to handle errors properly. Both XMLHttpRequest and Fetch API provide mechanisms to catch and handle errors.

fetch('https://jsonplaceholder.typicode.com/invalid-url')
    .then(response => {
        if (!response.ok) {
            throw new Error('Network response was not ok');
        }
        return response.json();
    })
    .then(data => {
        console.log(data);
    })
    .catch(error => {
        console.error('There was a problem with the fetch operation:', error);
    });

async function processData() {
    try {
        const data = await fetchData();
        console.log(data);
    } catch (error) {
        console.error('Error:', error); // Output: Error: Error fetching data!
    }
}

processData();

The Event Loop is a core concept in JavaScript that allows the language to perform non-blocking I/O operations despite being single-threaded. Understanding how the Event Loop works is crucial for mastering asynchronous programming.

You can easily send query parameters with your GET requests using Axios.

axios.get('https://jsonplaceholder.typicode.com/posts', {
    params: {
      userId: 1
    }
  })
  .then(response => {
    console.log('Posts by user 1:', response.data);
  })
  .catch(error => {
    console.error('Error fetching posts:', error);
  });

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