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3: Designing Pages with Frames in Java
3: Designing Pages with Frames
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Understanding frames Creating frames and framesets Modifying frame and frameset properties Targeting frames with links Adding noframes content Creating floating frames
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ack in the early days of the Internet, the most common use of frames was to ease navigation and reduce page loading wait times for site visitors using dialup modem connections The idea behind frames is this: The browser window is divided into several panes, or frames, that each display different HTML pages, independent of the content in the other frames Furthermore, by specifying the target frame within your hyperlinks, you can control which frame a new page opens in when a user clicks a link Suppose, for instance, a user visits a Web site comprised of a three part frameset with company information in the top frame, some navigation buttons in the left frame, and information pertinent to the Web site s products or services, such as contact information, in the main frame With this type of frameset, a visitor can click a link in the navigation frame, and the linked page opens in the main frame of the frameset Today many people visiting Web sites have high-speed connections, such as DSL, cable, T-1, or broadband With these faster types of Internet access, frames are no longer necessary as a navigation or layout tool Today, the recommended practice is to create page layouts using layers (see Book IV, 1) and CSS (see Book III, 1) In addition, frames have coding, printer, browser, and SEO issues, including problems with bookmarking pages and effective search engine optimization Nevertheless, they re still used every once in a long while, so you should know how to use them, especially in the event that you inherit a site that was built with them
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This chapter provides you with an overview of frames, including how to create and modify framesets, set attributes for frames and framesets, set the target attribute of links to display pages in specific frames, add noframes content for visitors using browsers without frame support, and insert floating frames on a page
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Frames enable you to divide a browser window into multiple panes, which are called frames Each frame contains a unique Web page that displays independently of the pages in the other frames in the browser window Then, with regular HTML, you can control the contents of each framed area separately For example, when a visitor clicks a link, you can have some frames on the page remain static while the content in another frame changes In the code, a page that defines the frame divisions or layout is called a frameset The frameset itself doesn t display any content in the browser window (except when you use the <noframes> tag, as described at the end of this chapter) Rather, the frameset provides formatting and layout instructions to the browser on how to display the pages inside the frames In other words, the frameset is merely a container in which other documents display You can use frames to format your entire Web site or just a particular section or page of a site When using frames as the layout format for your entire Web site, you typically save the frameset file as indexhtml so the page loads in the browser window when people visit the URL When the frameset page loads, the browser collects and displays the pages inside the individual frames You can divide frames vertically and horizontally into as many frame rows and columns as you need to achieve your layout For example, in Figure 3-1, the browser window is divided into three frames with static company information in the top frame, static navigation links in the left frame, and general information in the main frame When a visitor clicks a link in the navigation area, a new page displays in the main frame In the code, <frameset> tags replace the <body> tags, and the <frame> tags further define divisions in the frameset, as in the following sample code:
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<frameset rows= 80,* cols= * frameborder= NO border= 0 framespacing= 0 > <frame src= tophtml name= topFrame scrolling= NO noresize title= topFrame > <frameset cols= 80,* frameborder= NO border= 0 framespacing= 0 > <frame src= lefthtml name= leftFrame scrolling= NO noresize title= leftFrame > <frame src= mainhtml name= mainFrame title= mainFrame > </frameset> </frameset>
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