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padding:5px 5px 10px 5px; list-style-type:none; background:#A8D7E2; } #accordion ul.accordion-content li{ padding:1px 0px; display:block; margin:0; padding:2px 5px; } #accordion ul.accordion-content li a{ color:#D16C3A; }
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4. After the page loads, ensure that only the first menu element and content element are displayed. The following jQuery statement hides all of the instances of accordioncontent (content element) that are not the first element by using a combination of the not() method and :first filter.
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$( .accordion-content ).not( :first ).hide();
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The .not() method filters any elements or selectors that are matched using the selector that precedes it. This can be in the form of a filter, as seen in this example, or you can pass it a specific element, such as seen in the example in the next step: 5. After you ve hidden all of the instances of accordion-content that are not the first element, create another statement to apply the show effect to only the first accordioncontent element:
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$( .accordion-content:first ).show();
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6. To create an active or selected menu item, I added a class to the CSS file called headeractive. Apply this class to the first accordion-header element using the following statement:
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$( .accordion-header:first ).addClass( header-active );
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I have also added icons to the accordion menu and use the empty span tags to place the icons on the header. I have set up a class called icon-active that shows a down arrow graphic notifying the user of which content section is open. When the icon-active class is not applied, a right arrow graphic is displayed using the span tag. Use the :first filter to select the first accordion-header element, and then chain a find method to search for the span tag and add the class icon-active.
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$( .accordion-header:first ).find( span ).addClass( icon-active );
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7. Now begins the fun stuff: making the accordion react to a user input. Attach a click event to the accordion-header menu element.
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$( .accordion-header ).click(function () { });
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8. The first statement that gets added to the click event handler function is to make sure any item already clicked retracts and any active classes are removed. You can do this by selecting any visible instance of accordion-content and applying the slideUp effect to it. Then use the prev method to go back up the DOM tree one element, which in this case is the accordion-header, and remove the class header-active from it.
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$( .accordion-header ).click(function () { $( .accordion-content:visible ).slideUp( slow ).prev(). removeClass( header-active ); });
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The prev() method allows you to search the DOM for the previous sibling and you can take it a step further by passing a selector string ( .active ) into the method as an argument. 9. Add a statement to guarantee that any visible icon-active element is hidden by removing the class icon-active.
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$( .accordion-header ).click(function () { $( .accordion-content:visible ).slideUp( slow ).prev(). removeClass( header-active ); $( .icon-active:visible ).removeClass( icon-active ); });
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Note: An important thing to remember is that the addClass(), removeClass(), and hasClass() methods do not require the period to be included when passing class names into them. This is often overlooked and can create errors in your jQuery scripts; however, the is(), filter(), and not() methods do require that the period be included before the class name. 10. Add a statement that selects the header that was clicked using the this keyword and add the class header-active. Then choose the next element using the next() method and slide it down slowly. 146
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$( .accordion-header ).click(function () { $( .accordion-content:visible ).slideUp( slow ).prev(). removeClass( header-active ); $( .icon-active:visible ).removeClass( icon-active ); $(this).addClass( header-active ).next().slideDown( slow ); });
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The next() method is the opposite of the prev() method. Instead of the previous sibling, this method returns the next sibling. 11. The final statement that is added inside of the click event handler function uses the this keyword in conjunction with the find method to add the class iconactive to the span tag found within the accordion-header element.
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$( .accordion-header ).click(function () { $( .accordion-content:visible ).slideUp( slow ).prev(). removeClass( header-active ); $( .icon-active:visible ).removeClass( icon-active ); $(this).addClass( header-active ).next().slideDown( slow ); $(this).find( span ).addClass( icon-active ); });
If you work with a Web site or application that adds menu and content elements dynamically to the accordion, just make sure to switch the click event attachment method from bind to live. Otherwise, the click event won t register new elements that are added to the DOM after the page has loaded. After pulling all of the HTML, CSS, and jQuery together and loading your page in a browser, you should see the accordion in full swing, as shown in Figure 6-9.