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Bootstrap 4 - Environment Setup


You can start using Bootstrap 4 in your website by including it from CDN(Content Delivery Network) or downloading from getbootstrap.com.

Using CDN

<!-- Compiled and Minified Bootstrap CSS -->
<link rel = "stylesheet" 
   href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
   integrity = "sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" 
   crossorigin = "anonymous">

<!-- jQuery Library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js" 
   integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" 
   crossorigin = "anonymous">
</script>

<!-- Popper -->
<script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" 
   integrity = "sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" 
   crossorigin = "anonymous">
</script>

<!-- Compiled and Minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" 
   integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" 
   crossorigin = "anonymous">
</script>
Include the CDN versions of jQuery and Popper.js (Bootstrap 4 uses jQuery and Popper.js to make use of JavaScript components such as modals, tooltips, popovers etc) before the minified Bootstrap JavaScript, if you are using the compiled version of JavaScript. There are following require jQuery
  • Used for closable alerts

  • Toggle the states by using buttons and checkboxes/radio buttons and collapse for toggling content

  • Carousel for slides, controls, and indicators

  • Dropdowns (uses the Popper.js for perfect positioning)

  • Open and close the Modals

  • For collapsing the Navbar

  • Tooltips and popovers (uses the Popper.js for perfect positioning)

Creating First Web Page with Bootstrap 4

there are following example of simple web page of Bootstrap 4
<html lang = "en">
    <head>
        <!-- Meta tags -->
        <meta charset = "utf-8">
        <meta name = "viewport" content = "width=device-width, initial-scale = 1, shrink-to-fit = no">

        <!-- Bootstrap CSS -->
        <link rel = "stylesheet"
        href = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
            integrity =" sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
            crossorigin = "anonymous">

        <title>Bootstrap 4 Example</title>
    </head>

    <body>
        <h2>Hello, world!!! Welcome to Welookups...</h2>

        <!-- jQuery first, then Popper.js, then Bootstrap JS -->
        <script src = "https://code.jquery.com/jquery-3.3.1.slim.min.js"
            integrity = "sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
            crossorigin = "anonymous">
        </script>

        <script src = "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
            integrity = "sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
            crossorigin = "anonymous">
        </script>

        <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
            integrity = "sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
            crossorigin = "anonymous">
        </script>

    </body>
</html>
Try it Yourself »

It will produce the following result −

Output

Hello, world!!! Welcome to Welookups..