With advancements in the world of digital marketing or web development, businesses tend to adopt measures that help them reach potential customers. Typically, businesses hire senior developers to create responsive websites that can target mobile customers as well as desktop customers. These Bootstrap interview questions will help you ace any interview for a developer role.
Bootstrap is one of the most popular open source projects on GitHub. Here are some reasons why developers love using Bootstrap in their web development projects:
1. It’s easy to learn and use
When learning Bootstrap, you follow the rules set by other developers. You have to follow certain conventions, which makes learning Bootstrap easy. The Bootstrap framework is easy to learn, use, and customize. Anyone can use Bootstrap for web development, regardless of their level of CSS/HTML or JavaScript expertise.
2. It comes with a powerful grid system
Bootstrap’s grid system is one of the most important aspects of the framework as it provides a solid foundation on which to build your website. The grid system is responsive, meaning it adjusts to different screen sizes and devices. It also uses various CSS classes, which are useful for further customizing the website layout.
3. Mobile-first
The most important thing about Bootstrap is that it is mobile-first, meaning the design is optimized for mobile devices. Mobile first means you start with the smallest screen and work your way up from there. Why is this important? Because people are using their phones more than ever. Did you know that nearly 83% of web traffic in India comes from mobile devices? As a web developer, you should not create websites that 83% of users cannot view.
4. Save time
When you use Bootstrap in your web development projects, you don’t have to build a website from scratch. Instead, you start with a framework that contains all the basic elements needed for any type of website (navigation menus, modal windows, etc.). This makes building websites much faster by limiting the time spent on tasks like styling buttons or adding input fields to forms.
5. It has a huge community
Bootstrap has a strong community behind it and continues to grow as more and more designers and developers use this framework for their projects. Because the community is growing, you have thousands of tutorials and articles to learn from. The Bootstrap community also supports you, which means if you get stuck or have questions, other developers will be able to help you.
6. Customizable
Bootstrap is easily customizable. You can adapt it to your needs and use it to create a unique website that will display perfectly on any device, regardless of screen size or resolution.
Bootstrap Interview Questions and Answers
1: Which of the following is a JavaScript framework/library?
2: What is the purpose of CSS in web development?
3: What does CRUD stand for in web development?
4: Which of the following is a popular CSS framework?
5: Which technology is commonly used for asynchronous communication between the client and server?
Ever wondered how much you really know? It's time to put your brain to the test!
Q1. What is Bootstrap?
Bootstrap is a web development platform based on a front-end framework. It is used to create exceptionally responsive designs using HTML and CSS. These templates are used for forms, tables, buttons, typography, templates, tables, navigation, carousels, and images. Bootstrap also has Javascript plugins that are optional. Bootstrap is mainly preferred for developing mobile web applications.
Q2. Explain why Bootstrap is preferred for website development.
Bootstrap has better features than other web development platforms. It offers wide browser support for almost all popular browsers like Opera, Chrome, Firefox, Safari, etc. If you are familiar with CSS and HTML, web development is easy with Bootstrap. Additionally, it supports mobile apps using responsive design and can adjust CSS based on device, screen size, etc. Instead of creating multiple files, it creates just one file, thus reducing the developer’s work.
Q3. What are the main components of Bootstrap?
The main components of Bootstrap include:
CSS: It includes various CSS files
Scaffolding: It provides the basic structure with grid system, link styles and background.
Layout Elements: This section provides a list of layout elements
JavaScript Plugins: It contains many jQuery and JavaScript plugins
Customization: To have your own version of the framework, you can customize the its components
Q4. List some of the features of Bootstrap.
Some of the features of Bootstrap are:
It is open source for use
Bootstrap is compatible with all browsers
It has a responsive design
Easy to use and fast
Q5. What is a class loader in Bootstrap?
A class loader is a part of JRE or Java Runtime Environment that loads Java classes into the Java virtual environment. A class loader also performs the process of converting a named class into its binary equivalent.
Q6. What is Contextual classes of table in Bootstrap?
Class
Description
.active
Applies the hover color to a particular row or cell
.success
Indicates a successful or positive action
.warning
Identifies a warning that might need attention
.danger
Indicates a dangerous or potentially negative action
Q7. How many types of layout are available in Bootstrap?
There are two main layouts for Bootstrap:
FlexibleLayout – This layout is needed to create an app that is 100% wider and covers the entire width of the screen.
FixedLayout – It is only used for standard screens (940px).
Both layouts can be used to create a responsive design.
Q8. What is the Bootstrap grid system?
Bootstrap has a dynamically movable fluid grid system that scales up to 12 columns as the size of the device or viewport increases. It includes predefined classes for simple layout options as well as powerful mixins to create more semantic layouts.
Q9. Give an example of a basic grid structure in Bootstrap.
here is an example of a basic grid structure:
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<divclass= "container">
<divclass= "row">
<divclass= "col-*-*"></div>
<divclass= "col-*-*"></div>
</div>
<divclass= "row">...</div>
</div>
<divclass= "container">....
Q10. Why do we use Jumbotron in Bootstrap?
Jumbotron is used to highlight content in bootstrap. It can be a slogan or it can be a title. This increases the size of the title and makes room for the landing page content. To implement Jumbotron in Bootstrap you should use:
Create a container<div> with class .jumbotron
For example, use <div class=”container”> if you don’t want the Jumbotron to reach the edge of the screen.
Q11. What are the two codes used to display code in Bootstrap?
There are two easy ways to display code in Bootstrap:
<code>Tag: This tag is used to display code inline.
<pre>Tag : If you have code with multiple lines or even a block element, you can display it using this code.
Q12. Explain the typography and links in Bootstrap.
Bootstrap defines the basic global display (background), typography, and link styles.
Basic Global Display − It sets the background color: #fff; on element.
Typography − This uses the @font-family-base, @font-size-base and @line-height-base attributes as a typographic base
LinkStyle − It sets the overall color of the link via @link -color attribute and apply link underline only on hover: .
Q13. What is progress bar in bootstrap?
Progress bar is used with HTML tag style in HTML element using <progress> keyword. In bootstrap we use html5 <progress> with css classes which have special functionality in bootstrap which is designed only for progress bar.
Q14. How to make images responsive?
Bootstrap allows you to make responsive images by adding .img-responsive class to the <img> tag.
This class applies to max-width: 100%; and height: cars; to the image so that it matches the parent element perfectly.
Q15. What is the difference between Bootstrap and Foundation?
Bootstrap
Foundation
Bootstrap offers an unlimited number of UI elements
Bootstraps uses pixels
It encourages to design for both desktop and mobile
Bootstrap support LESS as its preprocessor
In Foundation UI element options are very limited in numbers
Foundation use REMs
Foundation encourages to design mobile first
It supports Sass and Compass as its preprocessor
Q16. What are the steps for creating basic or vertical forms?
Steps to create a basic or vertical form include:
Add the role form to the parent <form> element
Wrap the label and control into one <div> with the .form-group class. This is necessary to achieve optimal spacing
Add the .form-control class to all texturl<input> , <textarea> , and <select>
Q17. What is Bootstrap element collapsing?
Bootstrap’s collapsible elements allow you to collapse any particular element without writing JavaScript or concertina markup. To apply collapsible elements in bootstrap, you need to add data-toggle=”collapse” to the controller element with data-target or href to automatically assign control to the collapsible element.
Additionally, you can use .collapse(options), .collapse(“show”) or .collapse(“hide”) for the same purpose.
Q18. Explain the list types supported by Bootstrap.
Bootstrap supports three types of lists such as:
Ordered List – An ordered list is a list in some sequential order and preceded by numbers.
Unordered List – An unordered list is a list that has no particular order and is traditionally stylized with bullets. If you don’t want bullets to appear, you can remove the style using the .list-unstyled class.
Definition List – In this type of list, each list item can consist of both the <dt> and the <dd> elements. <dt> stands for definition term. Subsequently, the <dd> is the definition of the <dt>.
Q19. What are media objects in Bootstrap and what are their types?
Media objects in Bootstrap help you place media objects such as images, videos, or audio to the left or right of a content block. Media items can be created using the .media class and the source specified using the .media-object class.
Media objects are of two types. The two types of multimedia objects are: .media .media-list
Q20. Explaining how to use the carousel plugin in Bootstrap.
Carousel plugin in bootstrap is used to create sliders in your web pages or websites. There are several carousel plugins used in bootstrap to display large content in small space by adding sliders.
For example: .carousel(options), .carousel(‘pause’), .carousel(cycle’), .carousel(‘prev’), .carousel(‘next’).
Q21. How can you create Nav elements in Bootstrap?
Bootstrap offers many different options for styling navigation elements. They all use the same markup and base .nav class. You must complete the following steps to create tabular or tabular navigation:
Start with a basic unordered list with the .nav base class
Add the .nav-tabs class
Q22. What is Glyicon? How to use them?
Glyphicons is an icon font that can be used in your web projects. Glyphicons Halflings are not free and require a license. However, their creator has made them freely available for Bootstrap projects.
To use the icons, simply use the following code almost anywhere in your code.
Leave space between the icon and the text for proper padding.
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<spanclass= "glyphicon glyphicon-search"></span>
Q23. What are the steps to create basic or vertical forms?
These are the steps involved in creating vertical or basic forms:
At first, a role form can be added to the parent <form> element.
Then, you have to add appropriate spacing by wrapping labels and control in <div> and using the function ‘class .form-group’.
At last, apply the function ‘class .form-control’ to different elements such as text url <input> , <textarea> and <select>
Q24. What do you mean by Bootstrap well?
Bootstrap is nothing but a container that makes the content appear to be swallowed. Sometimes it can also give a well effect on the website. So the developer can create a well and can also wrap the content in the well using <div> the class .well. The content will appear as you want.
Q25. What are the input groups in Bootstrap?
Input groups are extended form controls. You can easily add text or buttons to text inputs using input groups.
Additionally, you can add common elements to user input.
For example, you can add a dollar sign, @ for Twitter usernames, or anything else that might be common to your app’s interface.
To prepend or append elements to a .form-control you need to do the following:
Wrap it in a <div> with class .input-group
In the second step, place your extra content inside a <span> with class .input-group-addon.
After that place this <span> either before or after the <input> element.
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Bootstrap speeds up layout creation by providing a large number of templates and pre-built solutions. Other benefits include:
Ease of use
One of the key reasons why Bootstrap is so popular is its simple and easy-to-use file structure. However, this requires a basic grasp of HTML, CSS, and JS. Additionally, Bootstrap is simple, easy to learn and use; Someone with good Bootstrap skills can style an entire web application.
In contrast, this does not apply to CSS, which is easy to learn at a basic level but difficult to master. Designing a complex web application using CSS is not a simple task, even if you are good at it; therefore, time and effort are required, which Bootstrap reduces significantly.
Great starting point
Considering Bootstrap as a starting point or quickly putting together a simple and functional layout or design isn’t bad. This way, the developer can focus on developing other features of the website.
Browser Compatibility
Bootstrap meets the requirements of making your website accessible. It also helps you rank high in search results because it is compatible with the latest versions of popular browsers.
Responsiveness
Nowadays, most people use their phones to browse the web. Therefore, implementing mobile responsive designs is easier with Bootstrap than with CSS. With its amazing responsive grid system, Bootstrap makes creating responsive layouts simple by applying a number of predefined classes.
Encourages consistency
Bootstrap was developed to eliminate inconsistency problems between front-end and back-end developers. It eliminates the use of libraries that are always different between developers, leading to stability and consistency in project components.
Consistent UI
Bootstrap makes it easy to design consistent layouts and predict the appearance and behavior of Bootstrap style components. Multiple developers can collaborate and design without conflicting user interfaces within a single framework.
Customizability
Bootstrap allows developers to override standard classes to make websites look more special.
You can change the color palette of UI elements to match your brand colors or use one of the many pre-made templates.
Bloated code can cause slower site load times when using pre-built components and templates from Bootstrap. This can be minimized by customizing your Bootstrap installation to include only the necessary components.
Similar-looking websites
Bootstrap websites can look similar due to pre-made templates and their overuse because they are open source. Additionally, customizing the look and feel of layers requires good CSS knowledge.
Upskilling is not recommended.
Developers improve their CSS skills by actively using and applying them in web development projects.
Unfortunately, Bootstrap provides predefined CSS classes that discourage hard work, skill improvement, or knowledge development.
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