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We use the toggleClass() method for applying hover class to and removing the hover class from the buttons. Let s have a look at this first.
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toggleClass()
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This method removes the class if it is already applied to the selected element and applies the class if it is not already applied to the element. .toggleClass(class) Here class is the class that we want to apply (if it is not already applied) and remove (if it is already applied) on the selected element. We can see in the jQuery code that we have used toggleClass() to apply and remove the CSS class hover from the buttons with the occurrence of the click event. That is, when the click event occurs for the first time on a button, the style properties present in the hover class will be applied to the button, changing its background color to cyan and its foreground color to blue, as shown in Figure 3-17. When the button is clicked again that is, when the click event occurs again on the same button the CSS class hover will be removed from the button, giving it the same appearance as it had at the beginning (shown in Figure 3-16). We can have the same output on application of another method, known as toggle().
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toggle()
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This method attaches two event-handling functions to the selected element. The first event-handling function is executed with every even occurrence of the event, and the second event-handling function is executed with every odd occurrence of the event, with the count starting at zero. In other words, the first
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CHAPTER 3 EVENT HANDLING
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time the event occurs on the element, the first event-handling function will be executed (because the count starts at zero) and when the event occurs for the second time on the element, the second eventhandling function will be executed that is, with every subsequent event, the event-handling functions will cycle. .toggle(handler1, handler2) We can have the same effect of application and removal of the hover CSS class (with every click event) as we had in the preceding jQuery code by using the toggle() method. Let s have a look at the following jQuery code: $(document).ready(function() { $('.buttons').toggle( function(){ $(this).addClass('hover'); }, function(){ $(this).removeClass('hover'); } ); }); We can see that in the toggle() method, we have used two event-handling functions; the first one applies the hover CSS class to the elements of the buttons class (that is, on the Bold and Italic buttons), and the second one removes the CSS class from the buttons. Hence, when we click on either button, the hover class will be applied to it, changing its background and foreground colors as shown in Figure 3-17. When the click event occurs on the same button again, the hover class will be removed from it, making it appear as a simple button (without any foreground or background color applied) as it was at the beginning, as shown in Figure 3-16.
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3-12. Creating Image-Based Rollovers
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Problem
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You want to create an image-based rollover. Image rollovers are those that change shape when the mouse is moved over an image that designates a hyperlink to some web site.The image also changes if it is clicked once, to designate that it has already been visited.
Solution
Let s make an HTML file that contains a hyperlink element: <body> <a href="abc.com"><span class="roll"></span></a> </body>
CHAPTER 3 EVENT HANDLING
In the style sheet we will write style rules called link, hover, and active. The style sheet also contains a type selector img, the properties of which will be automatically applied to the img element without using jQuery code. The style sheet file may appear as shown here: .link{ display:block; width:170px; height:55px; background-image:url(btn1.bmp); background-repeat:no-repeat; background-position: top left; } .hover{ display:block; width:200px; height:70px; background-image:url(btn2.bmp); background-repeat:no-repeat; background-position: top left; } .active{ display:block; width:170px; height:55px; background-image:url(btn3.bmp); background-repeat:no-repeat; background-position: top left; } img{ border:0; } The jQuery code to apply the style rules defined in the style sheet to the empty span element of the class roll is as shown here: $(document).ready(function() { $('.roll').addClass('link'); $('.roll').hover( function(){ $(this).addClass('hover'); }, function(){ $(this).removeClass('hover'); } );
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