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CHAPTER 3 EVENT HANDLING
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$('#moviesbutton').click(function(){ $('.movies').show('slow'); $('.books').hide(); $('.music').hide(); }); $('#musicbutton').click(function(){ $('.music').show('slow'); $('.books').hide(); $('.movies').hide(); }); });
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In the HTML file, we can see that the text Books, Movies, and Music is enclosed in the span element of the class buttons so that the properties defined in the class selector buttons defined in the style sheet can be automatically applied to it. The class selector buttons contains the properties to give the shape of the button to this text. Also, we see that the buttons are assigned the unique IDs of booksbutton, moviesbutton, and musicbutton so that we can attach click events to them individually and write code for hiding the old text (information from an earlier button click) and for displaying the information related to the clicked button. In the jQuery code, we start by hiding the text of the paragraphs of class books, movies, and music that is, only the buttons will be visible initially when the web page is loaded. We then link the click event to the HTML element of id booksbutton that is, to the Books button. When the Books button is clicked, the contents of the paragraph of the class books becomes visible slowly giving it an animation effect (it contains the information related to books) and the contents of the paragraph of the classes movies and music are made invisible, hence displaying only the information for the button that is clicked on the screen. Initially only the three buttons Books, Movies, and Music will be displayed, as shown in Figure 3-32.
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Figure 3-32. Thee buttons: Books, Movies, and Music When the Books button is clicked, it will display the information related to it; that is, the paragraph of the class books will be displayed as shown in Figure 3-33.
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Figure 3-33. Information related to books is displayed when Books button is clicked Similarly, if the Movies button is clicked, it will hide the information related to the books or music and will make the information related to movies (that is, the paragraph of class movies) appear slowly on the screen with an animation effect, as shown in Figure 3-34.
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Figure 3-34. The information related to movies is displayed when the Movies button is clicked
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Adding a Mouseover Event
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Instead of applying click events to the buttons, we can also attach the mouseover event to them. The mouseover event will make the appropriate information appear when the mouse pointer enters the button (there is no need to click the button). The jQuery code for attaching the mouseover event may appear as follows: $(document).ready(function() { $('.books').hide(); $('.movies').hide(); $('.music').hide(); $('#booksbutton').mouseover(function(){ $('.books').show('slow'); $('.movies').hide(); $('.music').hide(); }); $('#moviesbutton').mouseover(function(){ $('.movies').show('slow'); $('.books').hide(); $('.music').hide(); });
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CHAPTER 3 EVENT HANDLING
$('#musicbutton').mouseover(function(){ $('.music').show('slow'); $('.books').hide(); $('.movies').hide(); }); });
3-19. Replacing Text with a Sliding Effect
Problem
You want one piece of text to be replaced by another; the first piece is slowly made invisible while the other appears gradually.
Solution
In this solution, we will be applying CSS styles directly to the elements using css() instead of picking them from the style sheet (see Recipe 3-6 for details of css()). Let s assume we have an HTML file that has two paragraph elements that are distinguished from each other by assigning them the IDs message1 and message2, respectively. <body> <p id="message1">jQuery is an open source project</p> <p id="message2">Manipulating DOM using jQuery</p> </body> Here is the jQuery code for applying the sliding effect: $(document).ready(function() { $('p#message1').css({'border': '2px solid', 'text-align': 'center','fontweight':'bold'}).hide(); $('p#message2').css({'backgroundColor': '#f00','color':'#fff','text-align': 'center', 'font-weight':'bold'}).click( function(){ $(this).slideUp('slow'); $('p#message1').slideDown('slow'); } ); });
How It Works
To the paragraph of id message1, we assign a solid border of 2px thickness, align its text at the center of the browser window, and set it to appear in bold. The background color of the paragraph of id message2 is set to red, and the foreground color of the text is set to white and is aligned at the center of the browser window.
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