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CD-266 Part VI . Appendixes provided to mail the bug information to a support center e-mail address an example of how to handle the occurrence of a bug in your scripts. Listing 16-10: Controlling Script Errors

Setting Inner Sizes

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Setting Outer Sizes

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As the document loads, it saves the current outer dimensions in global variables. One of the buttons restores the windows to these settings. Two parallel sets of buttons set the inner and outer dimensions to the same pixel values so that you can see the effects on the overall window and document area when a script changes the various properties. Because Navigator 4 displays different-looking buttons in different platforms (as well as other elements), the two buttons contain script instructions to size the window to best display the window contents. Unfortunately, no measure of the active area of a document is available, so that the dimension values were determined by trial and error before being hard-wired into the script. windowObject.innerHeight
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CD-263Appendix F . Examples from Parts III and IV The last statement in the example shows how to use the array syntax (brackets) to refer to a specific frame. All array indexes start with 0 for the first entry. Because the document asks for the name of the first frame (parent.frames[0]), the response is JustAKid1 for both frames. innerHeight innerWidth outerHeight outerWidth NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example In Listing 16-9, a number of buttons let you see the results of setting the innerHeight, innerWidth, outerHeight, and outerWidth properties. Listing 16-9: Setting Window Height and Width Figure 16-5: Property readouts from both frames loaded from Listing 16-7 windowObject.frames
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CD-261Appendix F . Examples from Parts III and IV external.NavigateAndFind( http://www.collegesports.net/scores.html , choice, scores ) } frames NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Listings 16-7 and 16-8 demonstrate how JavaScript treats values of frame references from objects inside a frame. The same document is loaded into each frame. A script in that document extracts info about the current frame and the entire frameset. Figure 16-5 shows the results after loading the HTML document in Listing 16-7. Listing 16-7: Framesetting Document for Listing 16-8 A call to determine the number (length) of frames returns 0 from the point of view of the current frame referenced. That s because each frame here is a window that has no nested frames within it. But add the parent property to the reference, and the scope zooms out to take into account all frames generated by the parent window s document. Listing 16-8: Showing Various Window Properties Continued windowObject.frames
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CD-260 Part VI . Appendixes Listing 16-6 (continued)

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external NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example The first example asks the user if it is okay to add a Web site to the Active Desktop. If Active Desktop is not enabled, the user is given the choice of enabling it at this point. external.AddDesktopComponent( http://www.nytimes.com , website , 200, 100, 400, 400) In the next example, the user is asked to approve the addition of a URL to the Favorites list. The user can follow the normal procedure for filing the item in a folder in the list. external.AddFavorite( http://www.dannyg.com/update6.html , JSBible 4 Support Center ) The final example assumes that a user makes a choice from a SELECT list of items. The onChange event handler of the SELECT list invokes the following function to navigate to a fictitious page and locate listings for a chosen sports team on the page. function locate(list) { var choice = list.options[list.selectedIndex].value windowObject.external
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CD-259Appendix F . Examples from Parts III and IV As the page loads, it stores the current state of each chrome element. One button for each chrome element triggers the toggleBar() function. This function inverts the visible property for the chrome object passed as a parameter to the function. Finally, the Restore button returns visibility to their original settings. Notice that the restore()function is also called by the onUnloadevent handler for the document. Also, if you load this example into NN6, non-fatal script errors occur when the scrollbars are turned on or off. Listing 16-6: Controlling Window Chrome

Toggle Window Bars


Continued windowObject.directories
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CD-258 Part VI . Appendixes dialogLeft dialogTop NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Although usually not a good idea because of the potentially jarring effect on a user, you can reposition a dialog box window that has been resized by script (or by the user if you let the dialog box be resizable). The following statements in a dialog box window document s script recenters the dialog box window. dialogLeft = (screen.availWidth/2) - (parseInt(dialogWidth)/2) + px dialogHeight = (screen.availHeight/2) - (parseInt(dialogHeight)/2) + px Note that the parseInt()functions are used to read the numeric portion of the dialogWidth and dialogHeightproperties so that the values can be used for arithmetic. directories locationbar menubar personalbar scrollbars statusbar toolbar NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example In Listing 16-6, you can experiment with the look of a browser window with any of the chrome elements turned on and off. To run this script, you must either sign the scripts or turn on codebase principals (see Chapter 46). Java must also be enabled to use the signed script statements. windowObject.directories
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CD-257Appendix F . Examples from Parts III and IV dialogArguments NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example See Listing 16-38 for the window.showModalDialog()method to see how arguments can be passed to a dialog box and retrieved via the dialogArgumentsproperty. dialogHeight dialogWidth NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility Example Dialog boxes sometimes provide a button or icon that reveals more details or more complex settings for advanced users. You can create a function that handles the toggle between two sizes. The following function assumes that the document in the dialog box has a button whose label also toggles between Show Details and Hide Details. The button s onClickevent handler invokes the function as toggleDetails(this). function toggleDetails(btn) { if (dialogHeight == 200px ) { dialogHeight = 350px btn.value = Hide Details } else { dialogHeight = 200px btn.value = Show Details } } In practice, you also have to toggle the display style sheet property of the extra material between none and block to make sure that the dialog box does not display scrollbars in the smaller dialog box version. windowObject.dialogHeight
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