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Creating a fixed menu system

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Figure 4-8 illustrates a very common type of Web page one with a menu on the left and a number of stories or topics in the main area Something is interesting about this particular design The button list on the left refers to specific segments of the page When you click one of these buttons (say, the Gamma button), the appropriate part of the page is called up, as shown in Figure 4-9

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Figure 4-8: At first glance, this is yet another two-column layout

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Figure 4-9: The page scrolls to the Gamma content, but the menu stays put!

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Normally, when you scroll down the page, things on the top of the page (like the menu) disappear In this case, the menu stays on the screen, even though the part of the page where it was originally placed is now off the screen Gamma isn t necessarily moved to the top of the page Linking to an element ensures that it s visible but doesn t guarantee where it will appear You can achieve this effect using a combination of positioning techniques

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Setting up the XHTML

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The HTML for the fixed menu page is simple (as you d expect by now):

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<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1 0 Strict//EN http://www w3 org/TR/xhtml1/DTD/xhtml1-strict dtd > <html lang= EN dir= ltr xmlns= http://www w3 org/1999/xhtml > <head> <meta http-equiv= content-type content= text/xml; charset=utf-8 /> <title>fixedRelativehtml</title> <link rel = stylesheet type = text/css href = fixedRelativecss /> </head> <body> <h1>Fixed Position</h1> <div id = menu > <ul> <li><a href = #alpha >Alpha</a></li> <li><a href = #beta >Beta</a></li> <li><a href = #gamma >Gamma</a></li> <li><a href = #delta >Delta</a></li> </ul> </div> <div class = content id = alpha > <h2>Alpha</h2> </div> <div class = content id = beta > <h2>Beta</h2> </div> <div class = content id = gamma > <h2>Gamma</h2> </div> <div class = content id = delta > <h2>Delta</h2> </div> </body> </html>

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The XHTML has only a few noteworthy characteristics: It has a menu The div named menu contains a list of links (like most menus) The menu has internal links A menu can contain links to external documents or (like this one) links inside the current document The <a href = #alpha >Alpha</a> code means create a link to the element in this page with the ID alpha The page has a series of content divs Most of the page s content appears in one of the several divs with the content class This class indicates all these divs will share some formatting The content divs have separate IDs Although all the content divs are part of the same class, each has its own ID This allows the menu to select individual items (and would also allow individual styling, if desired) As normal for this type of code, I left out the filler paragraphs from the code listing

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Setting the CSS values

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The interesting work happens in CSS Here s an overview of the code:

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/* fixedRelativecss */ body { background-color: #fff9bf; } h1 { text-align: center; } #menu { position: fixed; width: 18%; } #menu li { list-style-type: none; margin-left: -2em; text-align: center; } #menu a{ display: block; border: 2px gray outset; text-decoration: none; color: black; } #menu a:hover{ color: white; background-color: black;

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border: 2px gray inset; } #menu h2 { text-align: center; } content { position: relative; left: 20%; width: 80%; } content h2 { border-top: 3px black double; }

Most of the CSS is familiar if you ve looked over the other chapters in this minibook I changed the menu list to make it look like a set of buttons, and I added some basic formatting to the headings and borders The interesting thing here is how I positioned various elements Here s how you build a fixed menu:

Book III 4 in Java Maker PDF417 in Java Book III 4

Book III 4 in Java

Maker PDF417 in Java Book III 4