You are previewing Programming the Mobile Web.

Programming the Mobile Web

Cover of Programming the Mobile Web by Maximiliano Firtman Published by O'Reilly Media, Inc.
  1. Programming the Mobile Web
    1. SPECIAL OFFER: Upgrade this ebook with O’Reilly
    2. Preface
      1. Who This Book Is For
      2. Who This Book Is Not For
      3. What You’ll Learn
      4. Other Options
      5. If You Like (or Don’t Like) This Book
      6. Conventions Used in This Book
      7. Using Code Examples
      8. How to Contact Us
      9. Safari® Books Online
      10. Acknowledgments
    3. 1. The Mobile Jungle
      1. Myths of the Mobile Web
      2. The Mobile Ecosystem
      3. Mobile Knowledge
      4. Brands, Models, and Platforms
      5. Technical Information
      6. Market Statistics
    4. 2. Mobile Browsing
      1. The Mobile Browsing Experience
      2. Mobile Web Eras
    5. 3. Architecture and Design
      1. Website Architecture
      2. Design and Usability
    6. 4. Setting Up Your Environment
      1. Setting Up a Development Environment
      2. Production Environment
    7. 5. Markups and Standards
      1. First, the Old Ones
      2. Current Standards
      3. XHTML Mobile Profile and Basic
      4. CSS for Mobile
      5. Confusion
    8. 6. Coding Markup
      1. Heading Structure
      2. The Document Body
      3. Plug-ins and Extensions
    9. 7. CSS for Mobile Browsers
      1. Where to Insert the CSS
      2. Selectors
      3. CSS Techniques
      4. Common Patterns
      5. CSS Sprites
      6. WebKit Extensions
    10. 8. JavaScript Mobile
      1. Supported Technologies
      2. Coding JavaScript for Mobile Browsers
    11. 9. Ajax, RIA, and HTML 5
      1. Ajax Support
      2. JavaScript Libraries
      3. WebKit CSS Extensions
      4. Mobile Rich Internet Applications
      5. HTML 5
    12. 10. Server-Side Browser Detection and Content Delivery
      1. Mobile Detection
      2. Content Delivery
      3. Multimedia and Streaming
      4. Content Adaptation
      5. Mobilizing WordPress and Other CMSs
    13. 11. Geolocation and Maps
      1. Location Techniques
      2. Detecting the Location
      3. Showing a Map
    14. 12. Widgets and Offline Webapps
      1. Mobile Widget Platforms
      2. Standards
      3. Platforms
      4. Widget Design Patterns
    15. 13. Testing, Debugging, and Performance
      1. Testing and Debugging
      2. Performance Optimization
    16. 14. Distribution and Social Web 2.0
      1. Mobile SEO
      2. Mobile Web Statistics
      3. Mobile Web Advertising
      4. Mobile Web Social Features
    17. A. MIME Types for Mobile Content
      1. Markup and Script MIME Types
      2. Image MIME Types
      3. Mobile Content MIME Types
      4. Audio and Video MIME Types
      5. Widget and Webapp MIME Types
    18. Index
    19. About the Author
    20. Colophon
    21. SPECIAL OFFER: Upgrade this ebook with O’Reilly

Coding JavaScript for Mobile Browsers

First of all, let’s see what is happening with basic JavaScript compatibility (variables, functions and basic alert functionality) with mobile browsers. Table 8-1 illustrates the current levels of support on the different platforms.

Table 8-1. JavaScript support compatibility table


JavaScript support



Android browser




Nokia Series 40





Yes from 3.8

Can be disabled by the user or the company; in that case, noscript is executed



Openwave (Myriad)

Not available in Openwave; yes in Myriad Browser V7

Internet Explorer


Motorola Internet Browser


Opera Mobile


Opera Mini

Yes, but everything after the onload script will be executed on the server, generating a postback


As Openwave does not support JavaScript and Myriad 7 is not commonly found on mobile devices today (making testing difficult), Openwave/Myriad will be left out of the following JavaScript-related tables.

We need to pay special attention to proxied browsers, like Opera Mini. Remember that these browsers render our websites on their servers and send compressed and compiled content to the clients. The clients aren’t really browsers capable of rendering an XHTML file or JavaScript code.


For old non-JavaScript mobile browsers or for browsers with JavaScript disabled, we can use the noscript tag. Only those browsers will display its content.

When we talk about mobile JavaScript, we are talking about the same code you already ...

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