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This FAQ is part of the Code Style Help and FAQ section. Join our premium content service for full access all FAQ answers.
A: Believe it or not, the DOM1 visibility menus scripts couldn't be much simpler. It may help to ignore the menu and bullet object constructors and the for(...) loops that build the menus to start with. All the menu points are constructed the same way and do exactly the same thing except they have different link text and anchors.
The event handler functions are the more important part of this demonstration: menuOver(MenuID), stayOpen(MenuID), menuOut(MenuID) and hideNow(). You could hard code HTML with the same structure as one of the Javascript-built menus and it would work the same way. The menus are generated with Javascript to save non-Javascript browsers from displaying this markup.
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A: Yes, the external style sheet and script references shown in this example can be repeated in any number of pages.
<link rel="stylesheet" type="text/css" href="/styles/javascript/dom/visibility-HorizontalMenus.css" title="Standard" /> <script type="text/javascript" src="/scripts/dom/css/visibility-HorizontalMenuWriter.js"> </script>
These are the key parts, and any number of pages can refer to these files. If you want to include the noscript content too, you could use the server side include mechanisms of your Web server.
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A: This demonstration is compatible with the XHTML 1.0 strict DTD, it was not designed to be compatible with XHTML 1.1 or tested with this DTD. However, there is little practical difference and the menus could readily be adapted to this format, see XHTML 1.1 technical changes.
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A: Safari release 85 and 94 and onwards work with the Code Style DOM1 visibility menus.
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A: This is a known limitation of many browsers' rendering of forms and so-called "replaced" elements such as applets and objects. In short, there is nothing that can be done about it and the only way to work around this problem is not to position these elements where dynamic content may overlay them. See Positioned Elements and OS Controls, Applets and Plug-ins from Web Reference for further background.
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A: The problem you see is specific to the Opera Web browser, where the hidden, positioned div elements are effectively masking the body of the document. The body has a lower z-index value, so these layers are "above" it. This problem only seems to affect Opera and the only immediate solution is to ensure that no links are placed in this zone.
One solution is to move the absolute position of the menus outside the display area of the canvas when they are not visible. This should stop them from blocking other elements.
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A: Yes, you may, provided you pay a small fee and publish your version of the menu system under the same Creative Commons attribution share-alike terms. Please use the help form below to notify your intention and make a £25.00 donation. We can also customise this menu system to your requirements for an agreed fee.
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#LinkBar and individual #Link styles?
A: The #LinkBar and #MenuBar divisions are really just containers for the links that trigger the menus and the menus themselves. They are absolutely positioned so that all the links and all the menus can be aligned collectively, rather than positioning every link and menu individually.
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What's the difference between the #LinkBar and individual #Link styles?
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float declaration?
A: The explicit float: none; declaration on the menu lists should have no effect and could be removed from this stylesheet.
/*
Must override float on the menu divs.
*/
#Menu1 UL, #Menu2 UL, #Menu3 UL,
#Menu4 UL, #Menu5 UL{
float: none;
margin: 0em 0em 0em 1em;
padding: 0.2em 0em 0.5em 0em;
font-family: "times new roman",
serif;
}
During the development of the DOM1 visibility menus a new browser release (not noted, but perhaps an early build of Mozilla) would apparently inherit the float: left; property of the parent #MenuBar division, bunching the list elements tightly up to the left. This is incorrect behaviour, so the declaration is strictly redundant and could be removed.
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@import styles override the primary stylesheet?
A: The imported stylesheet may be overridden by any style rules that follow the @import rule, not vice versa. The W3C CSS recommendations say that any @import rules must be placed before any other rules in a stylesheet. (Early versions of Internet Explorer did not hold to this recommendation, and render @import styles at the end of a stylesheet, by the way.)
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How do @import styles override the primary stylesheet?
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A: It is generally preferable that any link does have an a:hover selector associated with it, so that it does highlight when a user selects it. This mouseover effect is not necessarily a default mode of Web browsers, so it is not critical in usability terms. However, the use of this CSS selector gives direct visual feedback that should help distinguish active page elements from static content. For dynamic menus, the hover effect is less critical still, because the display of the sub-menus themselves is a very direct visual cue that active content is present.
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How can I remove the mouseover highlight on the menu titles?
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