Download Safari Books Online apps: Apple iOS | Android

Entire Site

Safari Books Online

    Free Trial

    Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.


    Copyright
    Introduction
    Acknowledgments
    About the Authors
    Ch. 1. New Structural Elements in HTML5
    Ch. 2. Grouping, Text-Level, and Redefined Semantics
    Ch. 3. Browser Handling in HTML5
    Ch. 4. New Layout and Style Techniques with CSS3
    Ch. 5. HTML5 Web Forms
    Validation
    HTML 4 Input Types
    Beginner Recipe: Creating a Form to Collect Contact Information
    Beginner Recipe: Creating a Search Form with input type="search"
    Beginner Recipe: Creating Calendar and Time Controls
    Beginner Recipe: Creating a Number Picker
    Beginner Recipe: Creating a Slider (Without the Need for JavaScript)
    Beginner Recipe: Creating a Color Picker
    Beginner Recipe: Displaying Results with the output Element
    Beginner Recipe: Using Form Placeholder Text
    Beginner Recipe: Creating an Autocomplete Feature with list and datalist
    Beginner Recipe: Tracking the Completion of a Task with the progress Element
    Beginner Recipe: Measuring with the meter Element
    Beginner Recipe: Jumping to a form Element When the Page Loads
    Beginner Recipe: Allowing Multiple Entries
    Beginner Recipe: Basic Validation with the required Attribute
    Intermediate Recipe: Writing Your Own Validation Rule
    Beginner Recipe: Limiting User Input
    Intermediate Recipe: Customizing and Styling the Form
    Error Messages
    Advanced Recipe: Putting It All Together to Make a Sign-Up Form
    Summary
    Ch. 6. Drawing with Canvas
    Ch. 7. Embedding Video with HTML5
    Ch. 8. Embedding Audio with HTML5
    Ch. 9. Changing Browser History
    Ch. 10. Location Awareness with the Geolocation API
    Ch. 11. Client-Side Storage
    Ch. 12. Communication and Threading
    Ch. 13. Browser Experience in HTML5
    Ch. 14. Working with Local Files
    Ch. 15. Integrating Device Data
    Recipes
    Index
    • Create BookmarkCreate Bookmark
    • Create Note or TagCreate Note or Tag
    • DownloadDownload
    • PrintPrint
    Share this Page URL
    Help

    Chapter 5. HTML5 Web Forms > Beginner Recipe: Basic Validation with the require...

    Beginner Recipe: Basic Validation with the required Attribute

    The required attribute has been used in many examples in this chapter. If the attribute has been used, the browser will not attempt to submit the form if the required fields are empty. In browsers that support this attribute, if required fields are empty, an error will be shown, as shown in Figure 5.22.

    Figure 5.22. Error message for an incomplete required field in Opera 11



      

    You are currently reading a PREVIEW of this book.

                                                                                            

    Get instant access to over
    $1 million worth of books and videos.

      

    Start a Free Trial