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Bootstrap Interview Questions

An Overview of Bootstrap

Bootstrap is a robust, mobile-first, front-end framework that is used for creating robust websites and apps. The most significant advantage of Bootstrap is that it comes with in-built tools for creating responsive websites as well as interface components. This information is frequently asked in Bootstrap interview questions. Free for using and an open source, its intuitive and powerful structure allows for trendier and quicker website development. Bootstrap is a potent combination of HTML and CSS templates and supports most of the JavaScript extensions.

Using Bootstrap data APIs enable you to create advanced level interface components without writing JavaScript. Supported by most of the popular browsers, Bootstrap is easy and quick to get started even if you have basic knowledge of CSS templates and HTML. Get more knowledge on this if you are preparing for Bootstrap Interview Questions.

Development History of Bootstrap

Called initially as Twitter Blueprint, Bootstrap is the brainchild of Jacob Thornton and Mark Otto at Twitter. The team released the initial version as open source in August 2011. We have recently updated our selection of Bootstrap interview questions and answers for experienced professionals.

Latest Version

The recent version ‎4.2.1 was released in December 2018. Read more all past version and their features if you are preparing for Bootstrap interview questions and answers.

We have an extraordinary collection of various othere pages interview questions and answers pages that helps to crack your front end developer interviews.

Last update: 08 Jun 2019, 30 Questions and Answers

Bootstrap Interview Questions and answers

Looking for a new job? Do not miss to read our Bootstrap Interview Questions and answers. Whether you are a fresher or an experienced, these questions and answers that can help you to crack your interview.

Bootstrap is the set of codes written in HTML, CSS, and Javascript. Bootstrap is an open source framework. Bootstrap framework is used for developing the website and the web applications.

Bootstrap is one of the most essential tools for the front end developers because of bootstrap help in creating complete websites in a short period. With the help of Bootstrap, developers do not have to write long CSS code, and they get more time to design the web pages.

We have covered all levels of bootstrap interview questions - basic and advanced levels.

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  • Bootstrap 3 redesigned the components to use flat design & mobile first approach
  • Bootstrap provides the grid system for defining the layouts. The grid system has 12 columns, and many device sizes like Extra small devices(Phones), Small devices(Ipad, Tablet), Medium Devices(Desktop) and Large Devices(Desktop) and the sizes of each of the devices are pre-defined, and these pre-defined classes take the responsibility of the responsive aspects, therefore, no CSS is required.
  • The layout system of Bootstrap is percentage based which keeps the mobile device support at the forefront.
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<code> the tag is used for displaying the code inline and <pre> the tag is used if the system has to be presented as a standalone block element or if the law has multiple lines. While using the <pre> and <code> tags,unicode variants for the opening and closing tags − < and > should be used.

Example

                                                    

<code><header></code> wrapped as an inline element.

To display the code as a standalone block element use <pre> tag as:

<pre> <article> <h1>The Article Heading</h1> </article> </pre>
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Bootstrap has many predefined button styles, and each button reflects either a message to the user or an action to be performed.

 

The different button styles are:-

  • Primary
  • Success
  • Danger
  • Warning
  • Info

 

Classes for buttons are as follows:-

  • .btn-default
  • .btn-primary
  • .btn-success
  • .btn-info
  • .btn-warning
  • .btn-danger
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Bootstrap Navbar is a navigation bar which is located at the top of the web page.

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Glyphicons are the icon fonts that can be used in the web projects. It gives us 260 glyphicons

from the Glyphicons Halflings set and these Glyphicons can be used in the text, buttons,

toolbars, navigation, forms and many more. Glyphicons are available free of cost for the

Bootstrap projects.

Syntax

Example

                                                    

<span class="glyphicon glyphicon-name"></span>

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Form control in bootstrap automatically recieves the global styling.All the textual <input>,

<textarea>, and <select> elements with class .form-control have a specific width of 100%.

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The bootstrap accordion is a component which organizes the content within the collapsible

items. Bootstrap Accordion shows only one collapsed piece at the same time. For

examples:-FAQ Page, Multiple Choice Questions and the Data tables.

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We can resolve this problem in two ways.

1. We can add $('#myModal').modal({backdrop: 'static', keyboard: false})

OR

2.We cam add data-backdrop="static" data-keyboard="false" in <button data-target="#myModal" data-toggle="modal" data-backdrop="static" data-keyboard="false">

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The latest version of Bootstrap is Bootstrap 4.0.Version 4 released on 19th January 2018.

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Here are some of the feature of Bootstrap

  • Bootstrap offers LESS or SASS files, and it also includes CSS files
  • Bootstrap has ready templates which support new developers in making the website.
  • Bootstrap is an open-source framework
  • Bootstrap provides grid System.
  • Bootstrap has some pre styles components like Dropdowns, Navigation Bar, Labels, and Badges, etc.
  • Bootstrap has many Javascript Plugins.
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There are two types of layouts available in Bootstrap:-

  • Fluid Layout (.container-fluid):-In the Fluid layout, the width is 100 %, this layout changes its width as you are browsing content.
  • Fixed Layout (.container):- In the Fixed layout, the width is adjusted in pixels, it changes in parts (not continuous), and size will be updated at specified intervals.

Both the layouts are responsive, so any of the above two containers can be chosen to create a responsive design website.

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The modal plugin is the small window that is opened over the current page or in other words on the parent window without closing it. This small windows can be called a dialogue box or pop-up window.

If the plugin has to be added individually, then it can be written as modal.js.And when it has to be used as a bootstrap plugin, then bootstrap.js or the minified bootstrap.min.js can be used.

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Bootstrap has inbuilt classes through images can be easily styled like making the image round, circular and effects can also be given to the pictures like thumbnails. in Bootstrap beside styling and giving the effects to the images, images can be made responsive too and for doing that the class .img-responsive is added to the tag.

<img alt="Night sky" class="img-responsive" />

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When your site contains a lot of pages, then pagination comes into the picture. Pagination is the handling of the unordered list on your site

To create basic pagination add the .pagination class

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The Bootstrap grid System has a limit of 12 columns across the entire page. If a developer does not want to use the 12 columns individually then, it can be merged to create a more full column.

Bootstrap Grid system Classes

 

The grid system has the following four classes-

  • xs (for the phones - screens less than 768px wide)
  • sm (for the tablets - screens equal to or greater than 768px wide)
  • md (for the small laptops - screens equal to or greater than 992px wide)
  • lg (for the laptops and the desktops - screens equal to or greater than 1200px wide)
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The basic grid structure used in Bootstrap is:-

Example

                                                    

<div class="container">

<div class="row">

<div class="col-*-*"></div>

<div class="col-*-*"></div>

</div>

</div>

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Its class is a container to enhance an input by adding a button, icon, or text in the frontend. It extended Form Controls.

In Short, using these input groups classes you can easily prepend and append text or buttons.

We have listed some of the most common bootstrap interview questions and answers for experienced developers as well as for freshers.

Example

                                                    

<div class="input-group">

       <span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>

       <input id="email" type="text" class="form-control" name="email" placeholder="Email">

</div>

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The Bootstrap breadcrumb is a navigator that indicates the current web page's location to

the user within the same website or the application. When there are many pages on the

website, then the breadcrumb increases the accessibility.

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Progress bars are used to show the progress of a particular task or the specific action to the user.

Here is the example of creating a progress bar with the vertical gradient:-

Example

                                                    

<div class="progress">

<div class="progress-bar" style="width: 50%;">

<span class="sr-only">50% Complete</span>

</div>

</div>

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