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Mastering Bootstrap 4

You're reading from   Mastering Bootstrap 4 Master the latest version of Bootstrap 4 to build highly customized responsive web apps

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Product type Paperback
Published in Feb 2018
Publisher Packt
ISBN-13 9781788834902
Length 354 pages
Edition 2nd Edition
Languages
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Author (1):
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Benjamin Jakobus Benjamin Jakobus
Author Profile Icon Benjamin Jakobus
Benjamin Jakobus
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Table of Contents (13) Chapters Close

Preface 1. Revving Up Bootstrap FREE CHAPTER 2. Making a Style Statement 3. Building the Layout 4. On Navigation, Footers, Alerts, and Content 5. Speeding Up Development Using Third-Party Plugins 6. Customizing Your Plugins 7. Advanced Third-Party Plugins 8. Utilities 9. List Groups and Accordions 10. Optimizing Your Website 11. Integrating with AngularJS and React 12. Other Books You May Enjoy

Browser detection

Do you remember, the hypothetical example from Chapter 4, On Navigation, Footers, Alerts, and Content, where MyPhoto only supports browsers above certain versions? We added a Bootstrap alert to our page, which notified visitors that their browser is not supported. Up until now, however, we had no way to actually identify which browser or browser version a MyPhoto visitor was using. Lacking any logic to hide or display the alert, the alert was visible regardless of whether or not the user's browser was actually supported by our website. Now the time has come for us to implement this missing logic.

Web browsers identify themselves by specifying their name and version information using a special field called User-Agent, which is part of the HTTP Request Header (refer to figure 5.1). JavaScript allows users to access this field using the window.navigator property...

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