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CHAPTER 11 HTML5
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Note You'll notice that I used the addEventListener method to attach the events to the video. addEventListener is the proper DOM method to use for attaching event handlers to objects. In earlier chapter we avoided addEventListener and used the HTML-DOM on prefixed properties such as onclick because Internet Explorer (up to version 8) used an alternate attachEvent method. Internet Explorer 9, which supports <video> and is required for this chapter, also supports the proper addEventListener method so it's safe to use in this example.
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To style the controls, add the following to the player.css file. You can alter the appearance however you like using CSS: .video-wrapper { overflow: hidden; } .video-wrapper .controls { position: absolute; height:30px; width:30px; margin: auto; background: rgba(0,0,0,0.5); } .video-wrapper button { display: block; width: 100%; height: 100%; border: 0; cursor: pointer; font-size: 17px; color: #fff; background: transparent; } .video-wrapper button[paused] { font-size: 12px; } When the page finishes loading, the window.load event runs the createVideoControls function, and the result is a very crude video control interface that allows you to play and pause the video.
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CHAPTER 11 HTML5
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Obviously this simple example is a very minimal set of video controls. You'll probably want to add a scrubbing bar with a play position indicator, various time stamps, or other special controls using the video's other properties and events. The choice of controls to create is now up to you. I suggest you look at the rest of the video-related properties available in the HTML5 video specification (http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#video) and a working example at http://www.w3.org/2010/05/video/mediaevents.html. Also check out The Definitive Guide to HTML5 Video, by Silvia Pfeiffer (Apress, 2011) to learn more about the <video> element and see what else you can do with it.
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The last of the HTML5 elements we'll experiment with is the form. Forms are a staple of every web page, but until the advent of HTML5, the selection of input types was a little sparse. Text, radio controls, and checkboxes were great for simple forms, but more often than not DOM scripting had to fill a void when more interaction was necessary. If you wanted something like a date input, it was up to you to create the necessary JavaScript and the appropriate interface. Thankfully, HTML5 introduces a number of new elements, input types, and attributes to fill these holes but, as usual, your DOM scripting talents aren't going to go to waste anytime soon. The new input types are email for email address specific inputs url for URL-specific inputs date and time for calendar inputs number for numeric inputs range for sliders search for search boxes
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CHAPTER 11 HTML5
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They offer a number of advantages over the stuffy old type="text". Because you re explicitly telling the browser the type of data you're expecting, the browser can offer better input control, such as altering the keyboard input on a mobile device. Here, we see that mobile Safari on the iPhone shows one keyboard for text and a modified keyboard targeted at email addresses:
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Likewise, new attributes include these: autocomplete to incorporate a list of suggested completions for text autofocus to automatically focus an element of the form form to allow you to group form elements placed outside of the <form> tags min, max, and step for ranges and numbers pattern to define a regular expression that is used to validate the value of the input placeholder for temporary initial hints in a text field required to indicate the field is required
CHAPTER 11 HTML5
These attributes let the browser take over control of many tasks that were formerly the responsibility of DOM scripts, such as presenting autocomplete suggestions and form validation. In all cases, however, we need to account for situations where some browsers don't understand newer types and attributes. You can jump right in today with new input types because they're backward-compatible sort of. For an HTML5 input such as email: <input type="email" /> an older browser will default the type back to text and present the standard text input we're all familiar with. That's great for email or maybe search types but not so great for a range slider. In this case the user interface would be a text box instead of the slider you want, as shown here with Safari and Internet Explorer.
To accommodate incompatible browsers, you need to fall back to another solution using feature detection. The Modernizr library, presented earlier in the chapter, provides simple compatibility checks. To check whether an input type is supported, use the inputtypes.type property: If ( !Modernizr.inputtypes.date ) { // Apply a date picker script } or, to check for support of specific attributes, you can use the input.attribute property: if ( !Modernizr.input.placeholder ){ // Apply a placeholder hint script } If you're not using Modernizr, you can use the following inputSupportsType function to check if a browser supports a specific input type: function inputSupportsType(type) { if (!document.createElement) return false; var input = document.createElement('input'); input.setAttribute('type',type); if (input.type == 'text' && type != 'text') { return false; } else { return true; } } To use the inputSupportsType function, apply the same logic as the Modernizr example: If ( !inputSupportsType('date') ) { // Apply a date picker script }
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