CD-391Appendix F . Examples from Parts III and IV Example If you have a background image file named images/logoBG.gif, a script can set the background via the following statement: document.body.background = images/logoBG.gif To clear the background image: document.body.background = If a background color has been previously set, the color becomes visible after the image disappears. bgColor See aLink. bgProperties NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Both of the following statements change the default behavior of background image scrolling in IE4+: document.body.bgProperties = fixed or document.body.style.backgroundAttachment = fixed The added benefit of using the style sheet version is that it also works in NN6. document.body.bgProperties
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CD-390 Part VI . Appendixes BODY Element Object Properties aLink bgColor link text vLink NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example You can modify Listing 18-1 for use with IE4+ and NN6+ only by using the new property names instead. Replace all references to the documentproperties with their document.body equivalents. For example, the function would be reworked as the following (changes in boldface): function showColorValues() { var result = result += bgColor: + newWindow.document.body.bgColor + n result += vLink: + newWindow.document.body.vLink + n result += link: + newWindow.document.body.link + n document.forms[0].results.value = result } background NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility document.body.background
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CD-389Appendix F . Examples from Parts III and IV Listing 18-19: Scripting the Browser Stop Button

onStop Event Handler

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Click the browser s Stop button (in IE) to stop the script counter.

document.onStop
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CD-388 Part VI . Appendixes Notice that except for NN2, you can easily modify Listing 18-17 to write the results to the same frame as the document containing the field and buttons. Instead of specifying the lower frame parent.frames[1].document.open() parent.frames[1].document.write(msg) parent.frames[1].document.close() the code simply can use document.open() document.write(msg) document.close() This code would replace the form document with the results and not require any frames in the first place. Because the code assembles all of the content for the new document into one variable value, that data survive the one document.write() method. The frameset document (Listing 18-18) creates a blank frame by loading a blank document (Listing 18-18). An alternative I highly recommend is to have the framesetting document fill the frame with a blank document of its own creation. See Blank Frames in Chapter 16 for further details about this technique for NN3+ and IE3+. Event Handlers onStop NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Listing 18-19 provides a simple example of an intentional infinitely looping script. In case you load this page into a browser other than IE5, you can click the Halt Counter button to stop the looping. The Halt Counter button as well as the onStop event handler invoke the same function. document.onStop
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CD-387Appendix F . Examples from Parts III and IV Figure 18-2: Clicking the Write To Below button in the upper frame causes a script to assemble and write HTML for the bottom frame. A second point to note is that this example customizes the content of the document based on user input. This customization makes the experience of working with your Web page feel far more interactive to the user yet you re doing it without any CGI programs running on the server. The third point I want to bring home is that the document created in the separate frame by the document.write() method is a genuine document object. In this example, for instance, the Figure 18-2 shows an example of the frame written by the script. document.write()
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CD-385Appendix F . Examples from Parts III and IV Example The example in Listings 18-16 through 18-18 demonstrates several important points about using the document.write() or document.writeln() methods for writing to another frame. First is the fact that you can write any HTML code to a frame, and the browser accepts it as if the source code came from an HTML file somewhere. In the example, I assemble a complete HTML document, including basic HTML tags for completeness. Listing 18-16: Frameset for document.write() Example Listing 18-17: document.write() Example

Getting Selected Text

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Select some text and see how JavaScript can capture the selection:

ARTICLE I

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

open([ mimeType ] [, replace]) NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example You can see an example of where the document.open() method fits in the scheme of dynamically creating content for another frame in the discussion of the document.write() method, later in this chapter. document.open()
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CD-382 Part VI . Appendixes Example Use The Evaluator to test out the getElementsByName()method. All form elements in the upper part of the page have names associated with them. Enter the following statements into the top text field and observe the results: document.getElementsByName( output ) document.getElementsByName( speed ).length document.getElementsByName( speed )[0].value You can also explore all of the properties of the text field by typing the following expression into the bottom field: document.getElementsByName( speed )[0] getSelection() NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example The document in Listing 18-15 provides a cross-browser (but not IE5/Mac) solution to capturing text that a user selects in the page. Selected text is displayed in the textarea. The script uses browser detection and branching to accommodate the diverse ways of recognizing the event and reading the selected text. Listing 18-15: Capturing a Text Selection