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$('.roll').click(function(event){ $(this).addClass('active'); event.preventDefault(); }); });
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The preceding HTML file contains a span element of the class roll, which will be filled with images through style rules and jQuery code. We will be using three images in this solution: btn1.bmp, btn2.bmp, and btn3.bmp, shown in Figure 3-18 to 3-20. In the style sheet, the style rule link contains the properties that will be applied to the image when the web page is loaded. It assigns the width and height of 130px and 35px, respectively, to the image. Also the image btn1.bmp is loaded at the background and the value of the background-repeat property is set to no-repeat so as to avoid repetition of the image and make it appear only once. Since we want the button to become larger when the mouse pointer is moved over it, the hover style rule contains the second image: btn2.bmp (shown in Figure 3-18). The rest of the properties in this style rule are the same as those in the link style rule. The third style rule designates the image when the link is visited once, so we use the image named btn3.bmp. The only change between the two images btn1.bmp and btn3.bmp is in the color of the button text. The color of the text on the button in btn3.bmp is set to maroon to represent that its link has been visited. The style sheet also contains a type selector img that has a single property border with its value set to zero to remove the border from the three images that will be displayed. In the jQuery code, the statement $('.roll').addClass('link'); will apply the link style rule to the span element, making the image in btn1.bmp appear on the screen. The statements $('.roll').hover( function(){ $(this).addClass('hover'); }, function(){ $(this).removeClass('hover'); } ); add the hover event to the span element, with two inline functions attached to it. The first function applies the style rule hover to the span element (when the mouse pointer is moved over the image), making btn2.bmp (the enlarged image) appear in place of btn1.bmp. The btn1.bmp image will be hidden by the image in btn2.bmp because the position of the images is set to top left via the background-position property. The second inline function (applied when the mouse pointer is moved away from the image) removes the style rule hover from the image, making it appear as it was previously that is, just like btn1.bmp.
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The statement $(this).addClass('active'); applies the property defined in the active style rule to the image, setting the background image btn3.bmp to appear. This image has the button text set to maroon to make it appear different from the initial image, so as to show that it has been visited already. The statement event.preventDefault(); prevents the browser from navigating to the hyperlinked web site. That is, it makes the hyperlink ignore its default action (which is navigating to the linked web site). As a result, we remain at the same web page even after clicking the image. Initially the image may appear as shown in Figure 3-18.
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Figure 3-18. The usual button that appears in default state When the mouse pointer is moved over the image, the image becomes enlarged, as shown in Figure 3-19.
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Figure 3-19. The button in enlarged state when the mouse moves over it The image changes if we click on the image link, as shown in Figure 3-20.
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Figure 3-20. The color of the button text changes in active state (when it is clicked).
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3-13. Adding and Removing Text in Response to Events
Problem
You have two buttons on the web page with the text Add and Remove, respectively. You want to have certain text be added to the web page when the user selects the Add button, and have the added text removed when the user selects the Remove button.
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