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6-7. Scrolling an Image Vertically
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You have several images, one below the other, which you want to scroll down the browser window slowly. When all of an image disappears, you want it to reappear from the top border of the browser window and continue scrolling downward.
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Let s make an HTML file to define all five images that we want to scroll, in the form of a hyperlink. If we click on any image, it will navigate us to the target web site that displays the complete information about the image. Here we assume the target web site as some hypothetical web site. The HTML file should appear as shown here: <body> <div id="scroller"> <a href="http://example.com" ><img src="image1.jpg" width=150px height=150px /></a> <a href="http://example.com"><img src="image2.jpg" width=150px height=150px /></a> <a href="http://example.com"><img src="image3.jpg" width=150px height=150px /></a> <a href="http://example.com" ><img src="image4.jpg" width=150px height=150px /></a> <a href="http://example.com" ><img src="image5.jpg" width=150px height=150px /></a> </div> </body>
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All the anchor elements are enclosed within the div element of ID : scroller so as to apply the style properties defined in the ID selector #scroller to all the anchor elements and images. The ID selector is defined in the external style sheet style.css. Also, all the images are assigned an identical width and height of 150px to give them a uniform appearance. The style sheet style.css may appear as shown here: style.css #scroller { position: relative; height: 760px; width: 150px; } #scroller a img { border:0; } The jQuery code for making the images scroll is shown here: $(document).ready(function() { var $wrapper=$('#scroller'); $wrapper.css({overflow: 'hidden'}); var animator = function(imgblock) { imgblock.animate( {bottom:"-" + imgblock.height() + "px"}, 5000, function() { $(this).css({ bottom:imgblock.height()}); animator($(this)); } ); } animator($wrapper); });
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We can see in the style.css file that the ID selector #scroller contains a position property set to relative a necessary condition to make the image scroll (images scroll by assigning them some position relative to their current location). The height and width are set to 760px and 150px, respectively. The height of 760px is required to display all five images of height 150px each (one below the other), plus some distance between them. Also, the style sheet contains a type selector #scroller a img to apply the style properties to the img element nested inside the anchor element, which in turn is enclosed with an HTML element of ID scroller. That is, the style property with value 0 will be applied to the img elements to make the borders of the images invisible. Now in the jQuery code itself, we see that all the contents in the div element of ID scroller are retrieved and stored in a variable wrapper. That is, all the images are now contained in the wrapper variable. Using the .css() method, we apply the overflow property set to hidden to the wrapper variable (to the block of images) so as to make the images that scroll down the browser window invisible. Also, a function named animator is defined, which is invoked by the statement animator($wrapper);
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CHAPTER 6 VISUAL EFFECTS
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This statement invokes the animator function, and the wrapper variable containing the block of images is passed to it that will be assigned to its parameter imgblock. In the animator function itself, the code animates the image block toward the bottom of the browser window and stops it at the height of 760px from the bottom of the browser window. Since 760px is the total height of the image block, the whole image block will disappear. The image block will scroll down slowly, as we have defined the duration of animation as 5000 milliseconds. In the callback function of the animate method (that is invoked when the animate method is over), we make use of the .css() method to make the image block appear at the distance of 760px from the bottom border of the browser window, making the whole block visible. After that the animator function is recursively called to invoke itself to make the image block again scroll down toward the bottom of the browser window, and the process is repeated. The part of the image block visible while scrolling may appear as in Figure 6-12.
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