Introduction To Bootstrap

 Bootstrap

• Bootstrap is a powerful mobile-first front-end framework. It is very helpful in faster and easier web development by using HTML, CSS, and JavaScript.
• Bootstrap is open source and there are many Bootstrap sample applications already submitted on GitHub.

Browser Support

• Most of the browsers support Bootstrap framework.

Advantages of Bootstrap

• Easy to get started
• Responsive design
• Cross-browser support
• Easy to customize
• Encourages using LESS
• Supports useful jQuery plugins
• Many custom jQuery plugins available
• Mobile-first

Bootstrap Packages

• Bootstrap has a responsive mobile-first grid that allows us to develop our own design too.
• Bootstrap has some extremely useful jQuery plugins to show Modal, DropDown,Tooltip, and Carousel.

Download Bootstrap

• We can download the latest version of Bootstrap from http://getbootstrap.com.

Bootstrap Grid System

• Bootstrap has a responsive, mobile-first grid.This layout is responsive with mobile devices and laptops.
• Bootstrap Grid System can be appropriately split in up into 12 columns according to the design.

Working of Bootstrap Grid System

• Grid systems are used for creating page layouts through a series of rows and columns.It should be placed within columns, and only columns may be immediate children of rows.

Sample Menu

• We can create responsive menu by using Bootstrap framework.

The below code must be added to the head tag.

<meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

And, the following code must  be added to the body tag.

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Bootstrap Menu Sample</a>
    </div>
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home <span class="sr-only">(current)</span></a></li>
        <li><a href="#">Menu2</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Menu2 <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Sub-Menu1</a></li>
            <li><a href="#">Sub-Menu2</a></li>
            <li><a href="#">Sub-Menu3</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Sub-Menu4</a></li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Sub-Menu5</a></li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</nav>