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

Creating QR-Code in Font AN ANIMATED SLIDESHOW

CHAPTER 10 AN ANIMATED SLIDESHOW
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} var xpos = parseInt(elem.style.left); var ypos = parseInt(elem.style.top); var dist = 0; if (xpos == final_x && ypos == final_y) { return true; } if (xpos < final_x) { dist = Math.ceil((final_x - xpos)/10); xpos = xpos + dist; } if (xpos > final_x) { dist = Math.ceil((xpos - final_x)/10); xpos = xpos - dist; } if (ypos < final_y) { dist = Math.ceil((final_y - ypos)/10); ypos = ypos + dist; } if (ypos > final_y) { dist = Math.ceil((ypos - final_y)/10); ypos = ypos - dist; } elem.style.left = xpos + "px"; elem.style.top = ypos + "px"; var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"; elem.movement = setTimeout(repeat,interval); } Save these changes to moveElement.js. Reload list.html to see the difference.
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The animation now feels much smoother and snappier. When you first hover over a link, the image jumps quite a distance. As the image approaches its final destination, it eases into place.
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CHAPTER 10 AN ANIMATED SLIDESHOW
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The markup, the CSS, and the JavaScript all come together to create this slideshow effect. Everything is working fine, but there s always room for some small tweaks.
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Adding a safety check
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The moveElement function is working really well now. There s just one thing that bothers me. There is an assumption being made near the start of the function: var xpos = parseInt(elem.style.left); var ypos = parseInt(elem.style.top); It s assuming that the element elem has a left style property and a top style property. We should really check to make sure that this is the case. If the left or top properties haven t been set, we have a couple of options. We could simply exit the function there and then: if (!elem.style.left || !elem.style.top) { return false; } If JavaScript can t read those properties, then the function stops without throwing up an error message. Another solution is to apply default left and top properties in the moveElement function. If either property hasn t been set, we can give them a default value of "0px": if (!elem.style.left) { elem.style.left = "0px"; } if (!elem.style.top) { elem.style.top = "0px"; } The moveElement function now looks like this: function moveElement(elementID,final_x,final_y,interval) { if (!document.getElementById) return false; if (!document.getElementById(elementID)) return false; var elem = document.getElementById(elementID); if (elem.movement) { clearTimeout(elem.movement); } if (!elem.style.left) { elem.style.left = "0px"; } if (!elem.style.top) { elem.style.top = "0px"; } var xpos = parseInt(elem.style.left); var ypos = parseInt(elem.style.top); var dist = 0; if (xpos == final_x && ypos == final_y) { return true; } if (xpos < final_x) { dist = Math.ceil((final_x - xpos)/10);
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CHAPTER 10 AN ANIMATED SLIDESHOW
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xpos = xpos + dist; } if (xpos > final_x) { dist = Math.ceil((xpos - final_x)/10); xpos = xpos - dist; } if (ypos < final_y) { dist = Math.ceil((final_y - ypos)/10); ypos = ypos + dist; } if (ypos > final_y) { dist = Math.ceil((ypos - final_y)/10); ypos = ypos - dist; } elem.style.left = xpos + "px"; elem.style.top = ypos + "px"; var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"; elem.movement = setTimeout(repeat,interval); } With that safety check in place, we no longer need to explicitly set the position of the "preview" element. Right now, we re doing that in the prepareSlideshow function. Remove these lines: preview.style.left = "0px"; preview.style.top = "0px"; While we re at it, let s overhaul the prepareSlideshow function.
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Generating markup
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The list.html document contains some markup that exists just for the JavaScript slideshow: <div id="slideshow"> <img src="images/topics.gif" alt="building blocks of web design" id="preview" /> </div> If the user doesn t have JavaScript enabled, this content is somewhat superfluous. The div and the img element are there purely for the slideshow effect. Instead of hard-coding these elements into the document, it makes sense to use JavaScript to generate them. Let s do that in prepareSlideshow.js. First, create the div element: var slideshow = document.createElement("div"); slideshow.setAttribute("id","slideshow"); Next, create the img element: var preview = document.createElement("img"); preview.setAttribute("src","images/topics.gif"); preview.setAttribute("alt","building blocks of web design"); preview.setAttribute("id","preview"); Place the img inside the div: slideshow.appendChild(preview); Finally, we want these newly created elements to appear directly after the list of links. For this, we ll use the insertAfter function from 7:
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