barcode generator in c# web application AN ANIMATED SLIDESHOW in Font

Generate QR Code in Font AN ANIMATED SLIDESHOW

CHAPTER 10 AN ANIMATED SLIDESHOW
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var list = document.getElementById("linklist"); insertAfter(slideshow,list); The finished prepareSlideshow function looks like this: function prepareSlideshow() { // Make sure the browser understands the DOM methods if (!document.getElementsByTagName) return false; if (!document.getElementById) return false; // Make sure the elements exist if (!document.getElementById("linklist")) return false; var slideshow = document.createElement("div"); slideshow.setAttribute("id","slideshow"); var preview = document.createElement("img"); preview.setAttribute("src","images/topics.gif"); preview.setAttribute("alt","building blocks of web design"); preview.setAttribute("id","preview"); slideshow.appendChild(preview); var list = document.getElementById("linklist"); insertAfter(slideshow,list); // Get all the links in the list var links = list.getElementsByTagName("a"); // Attach the animation behavior to the mouseover event links[0].onmouseover = function() { moveElement("preview",-100,0,10); } links[1].onmouseover = function() { moveElement("preview",-200,0,10); } links[2].onmouseover = function() { moveElement("preview",-300,0,10); } } addLoadEvent(prepareSlideshow); Now we need to make some changes to list.html. We can remove the markup with the "slideshow" div and the "preview" image. We also need to include one more set of <script> tags to reference the insertAfter.js file. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Web Design</title> <link rel="stylesheet" href="styles/layout.css" media="screen" /> </head> <body> <h1>Web Design</h1> <p>These are the things you should know.</p> <ol id="linklist"> <li> <a href="structure.html">Structure</a> </li> <li>
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CHAPTER 10 AN ANIMATED SLIDESHOW
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<a href="presentation.html">Presentation</a> </li> <li> <a href="behavior.html">Behavior</a> </li> </ol> <script src="scripts/addLoadEvent.js"></script> <script src="scripts/insertAfter.js"></script> <script src="scripts/moveElement.js"></script> <script src="scripts/prepareSlideshow.js"></script> </body> </html> Write the insertAfter function to a file called insertAfter.js and place it in the scripts folder: function insertAfter(newElement,targetElement) { var parent = targetElement.parentNode; if (parent.lastChild == targetElement) { parent.appendChild(newElement); } else { parent.insertBefore(newElement,targetElement.nextSibling); } } The other file we need to update is the style sheet, layout.css. Remove this line from prepareSlideshow.js: preview.style.position = "absolute"; Now place that declaration in the style sheet, where it belongs: #slideshow { width: 100px; height: 100px; position: relative; overflow: hidden; } #preview { position: absolute; } Now refresh list.html in a web browser. You will see no difference in functionality. Everything is behaving just as before. The difference is that now there is better separation of structural, presentational, and behavioral elements. If you view the same page with JavaScript disabled, the slideshow image simply doesn t appear. Functionally, the JavaScript slideshow is working very well. With JavaScript enabled, the slideshow adds some nice visual feedback, responding to the user s actions. With JavaScript disabled, the functionality degrades gracefully. If you wanted to visually associate the list of links more closely with the slideshow, you could do that by editing layout.css. You could float the two elements side by side. You could also place a border around the slideshow if you wanted it to stand out more.
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CHAPTER 10 AN ANIMATED SLIDESHOW
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What s next
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This chapter began with a definition of animation: changing an element s position over time. Using a combination of CSS-DOM and JavaScript s setTimeout function, it s quite easy to create a simple animation. The difficulty with animation isn t technical; it s practical. You can create a lot of cool effects with animation, but there aren t many situations where it s useful or helpful to the user to move elements around. The JavaScript slideshow example in this chapter is a notable exception. It took some work to get it to work smoothly and degrade gracefully, but the final result is worth it. You now have a reusable function that you can use whenever you want to create a slideshow or some other practical use of animation. The next chapter focuses on the latest incarnation of HTML: HTML5. You ll learn how to take advantage of the new features it offers.
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C H A P T E R 11
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HTML5
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What this chapter covers: What HTML5 is How you can use it today A brief introduction to a number of new HTML5 features including canvas, audio, video and forms
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I began this book with an over-the-shoulder look at the history of JavaScript and the emergence of a standardized Document Object Model. Today, the emergence of HTML5 is blurring the lines between the DOM, style, and behavior, so let's take a look at what's new and where things are headed in the future.
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