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You have some news in the form of text to be displayed to the visitor of your web site. You want the news to scroll upward in an invisible window. When the news is completely scrolled up, you want it to appear again at the bottom of the window and continue scrolling upward. We will be writing the solution of this problem using two methods: first we ll use the .animate() method and then we ll use the .css() method.
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Let s start out with an HTML file to display the news in the form of a paragraph element. The paragraph element is enclosed within the div element of ID scroller. The HTML file should appear as shown here: <body> <div id="scroller"> <p>Styles make the formatting job much easier and more more efficient. To give an attractive look to web sites, styles are heavily used. A person must have a good knowledge of HTML and CSS and a bit of JavaScript. jQuery is a powerful JavaScript library that allows us to add dynamic elements to our web sites. Not only is it easy to learn, but it s easy to implement too. jQuery is an open source project that provides a wide range of features with cross-platform compatibility. jQuery has hundreds of plug-ins to extend its features. jQuery helps in increasing interactions with a web site. </div> </body> The idea of defining the div element is to apply certain style properties to it automatically via the ID selector #scroller to define the size of the news window within which the news will scroll. This ID selector #scroller is defined in the style sheet style.css. Also, the style sheet contains the type selector #scroller p that contains the style properties to be applied to the text of the paragraph element representing the news text. The style sheet style.css file may appear as shown here:
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style.css #scroller { height: 250px; width: 230px; overflow:hidden; position: relative; margin:auto; border:2px solid ; padding:10px; } #scroller p {font-weight:bold;position:relative;} The jQuery code to make the news scroll is shown here: $(document).ready(function() { var $wrapper=$('#scroller p'); $wrapper.css({top:0}); var animator = function(imgblock) { imgblock.animate( {top:-350}, 5000, function() { imgblock.css({top:250}); animator($(this)); } ); } animator($wrapper); });
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The ID selector #scroller contains the properties height and width set to 250px and 230px, respectively, to define the height and width of the news window (within which we want the news text to scroll). By setting the value hidden to the overflow property, we make the text that falls outside the height of the news box become invisible. The value of the position property is set to relative it is a necessary condition for any text or image to scroll, as scrolling happens on positioning an element relative to its current position. The margin property is set to auto to make the news scroller appear at the center of the width of the browser window. The border property will create a solid border of 2px thickness around the news text, and the padding property is set to 10px to define some spacing between the text and the news box s border. The type selector #scroller p contains the font-weight property set to bold to make the paragraph text appear in bold, and the position property is set to relative to make the paragraph text scroll. In the jQuery code itself, you can see that the whole of the paragraph text that is enclosed in the div element of ID scroller is retrieved and is stored in the variable $wrapper. The text is initially set to appear at the distance of 0px from the top border of the window; that is, the upper region of the text is made visible. The overflow text (that goes beyond the height of the news box) will not be visible. An animator function is defined and all the paragraph text (stored in the variable $wrapper) is passed to this function and is assigned to its imgblock parameter. The imgblock that is, all the paragraph text is set to animate toward the top boundary of the window and is set to stop at the distance of 350px from the
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