Peter Lubbers - Pro HTML 5 Programming

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186 CHAPTER 7 ■ USING THE <strong>HTML</strong>5 FORMS API As always, the source code for the demo files we show here is available in the code/forms folder. Therefore, we’ll spend less attention on the CSS and peripheral markup, and more on the core of the page itself. That being said, let’s start with a look at the finished page shown in Figure 7-4, then break it down into sections to tackle one-by-one. Figure 7-4. Example page with race signup form This signup page demonstrates many of the elements and APIs we’ve explored in this chapter, including validation. Although the actual display may look somewhat different on your browser, it should degrade gracefully even if the browser does not support a particular feature. On to the code! The header, navigation, and footer have all been seen before on our previous examples. The page now contains a element. Runner: Tel #:
placeholder="(xxx) xxx-xxx"> E-mail: DOB: CHAPTER 7 ■ USING THE <strong>HTML</strong>5 FORMS API In this first section, we see the markup for the four primary inputs: name, phone, email, and birthday. For each, we’ve set a with descriptive text and tied it to the actual control using the for attribute. We’ve also set placeholder text to show a description to the user of just what type of content belongs there. For the runner name text field, we’ve made it a required value by setting the required attribute. This will cause form validation to kick in with a valueMissing constraint if nothing is entered. On the phone input, we’ve declared it to be of type tel. Your browser may or may not display this field differently or provide optimized keyboards. Similarly, the e-mail field has been marked of type e-mail. Any specific handling is up to the browser. Some browsers will throw a typeMismatch constraint if they detect that the entered value is not a valid email. Finally, the date-of-birth field is declared as type date. Not many browsers support this yet, but when they do, they will automatically render a date picking control on this input. T-shirt Size: Small Medium Large Shirt style: In our next section, we set out the controls to be used to T-shirt selection. The first few controls are a standard set of radio buttons for selecting a shirt size. The next section is more interesting. Here, we exercise the list attribute and its corresponding element. In the , we declare a set of types that should be displayed for this list with distinct values and labels, representing the types of T-shirts available based on veteran status. Although this list is quite simple, the same technique can be used for lengthy lists of dynamic elements. Expectations: Confidence: 187
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THE EXPERT’S VOICE ® IN WEB DEVE
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■ ■ ■ Pro HTML5 Programming P
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For my beautiful wife, Vittoria, an
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Contents ■Foreword ..............
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■ CONTENTS Implementing Canvas Se
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■ CONTENTS Summary ..............
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■ CONTENTS Setting and Retrieving
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Foreword In June 2004, representati
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About the Technical Reviewer � Pa
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Introduction HTML5 is brand new. In
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C H A P T E R 1 ■ ■ ■ Overvie
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CHAPTER 1 ■ OVERVIEW OF HTML5 wit
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Interoperability Simplification CHA
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• MathML • Microdata • Server
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Figure 1-1. A page rendered in stan
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Table 1-2. New sectioning HTML5 ele
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CHAPTER 1 ■ OVERVIEW OF HTML5 Wit
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article { background-color: #eee; d
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Figure 1-2. An HTML5 page with all
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CHAPTER 1 ■ OVERVIEW OF HTML5 The
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Figure 1-3. Developer Tools view in
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CHAPTER 1 ■ OVERVIEW OF HTML5 All
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26 CHAPTER 2 ■ USING THE HTML5 CA
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C H A P T E R 3 ■ ■ ■ Working
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Audio and Video Codecs CHAPTER 3
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Table 3-1. Browser support for HTML
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MEDIA FOR EVERYONE CHAPTER 3 ■ WO
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CHAPTER 3 ■ WORKING WITH HTML5 AU
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Table 3-4 shows a few of the read-o
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find the actual frame since the vid
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LOSING VIEWERS IN THE OF AN EYE CH
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C H A P T E R 4 ■ ■ ■ Using t
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A device can use any of the followi
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Table 4-4. Pros and cons of cell ph
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Figure 4-1. HTML5 Geolocation brows
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CHAPTER 4 ■ USING THE HTML5 GEOLO
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Listing 4-6. The Haversine formula
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Listing 4-9. Adding the loadDemo()
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THE EASIEST WAY TO TRAVEL CHAPTER 4
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var deltaLatitude = toRadians(latit
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Practical Extras CHAPTER 4 ■ USIN
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Show Me on a Google Map CHAPTER 4
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C H A P T E R 5 ■ ■ ■ Using t
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CHAPTER 5 ■ USING THE COMMUNICATI
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var defaultTitle = "Portal [http://
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Send Notification CHAPTER 5 ■ U
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Figure 5-4. Difference between clie
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“SEEMINGLY ARBITRARY” TIMES CHA
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crossOriginRequest.upload.onprogres
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236 CHAPTER 9 ■ USING THE HTML5 W
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244 CHAPTER 10 ■ CREATING HTML5 O
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C H A P T E R 11 ■ ■ ■ The Fu
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Figure 11-1. Quake II 3D Shaders CH
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CHAPTER 11 ■ THE FUTURE OF HTML5
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270 ■ INDEX unsupported, 68 using
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274 ■ INDEX Web SQL database supp
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276 ■ INDEX HTML5 page CSS file f
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278 ■ INDEX media elements. See a
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280 ■ INDEX building application
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284 ■ INDEX stopping Web Workers,
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Peter Lubbers - Pro HTML 5 Programming

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