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CHAPTER 9 Browser Windows
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</head> <body> <FORM action="http://wwwjimkeoghcom" method="post"> <P> <INPUT name="GoToTop" value="Go To Top" type="button" onclick="Top()"/> </P> </FORM> </body> </html>
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Opening Multiple Windows at Once
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Some web sites bombard you with windows as soon as you enter the site New windows pop up all over the screen This is a nasty and annoying feature, because most users probably don t know how to get out of this maze Nevertheless, the following example shows you how to open multiple windows onscreen This example displays ve new windows when the Windows Gone Wild button is clicked, which is at least better than those annoying web sites that launch a battery of windows when the onload event occurs (Figure 9-4)
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Figure 9-4
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A JavaScript can be used to open multiple windows
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The Windows Gone Wild button calls the Launch() JavaScript function, which uses a for loop to execute the open() method ve times to open ve empty windows Notice that the rst parameter of the open() method is empty because we want to display blank windows You can, of course, insert a URL for the content you want to display in the window
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Open Multiple Windows</title> <script language="Javascript" type="text/javascript"> <!-function Launch() { for (i=0; i < 5;i++) { Win = windowopen('','win'+i,'width=50,height=50') } } --> </script> </head> <body> <FORM action="http://wwwjimkeoghcom" method="post"> <P> <INPUT name="WindowsGoneWild" value="Windows Gone Wild" type="button" onclick="Launch()"/> </P> </FORM> </body> </html>
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You can place dynamic content into a new window by using the document write() method to write HTML tags to the new window Though these sorts of script are a little tricky to write, you ll develop the knack for doing this after studying the next example
CHAPTER 9 Browser Windows
This example displays a button that, when clicked, calls the Window() JavaScript function that creates a new window and writes HTML tags to the new window The HTML tags are passed a string to the MyWindowdocument write() method MyWindow is referenced to the new window object that was created by the open() method The document is the document object contained within the new window The write() method is a method of the document object Anything written by the write() method appears in the new window Remember that when the browser sees an HTML tag, the browser interprets it according to HTML rules Look carefully, and you ll notice that the string passed to all the write() methods contains HTML tags that display a form in the new window The form consists of an input text box, where the customer is expected to enter a name Also on the form is a Submit Query button that, when clicked, sends the customer name to the server CGI application for processing (Figure 9-5) The most ef cient way to create dynamic content is rst to create the content as a web page that is, write the HTML tags as if the content were being written for your home page Once you are satis ed with the content, place double quotation marks around each line to create a string; then pass each string to the write() method after the new window is opened
Figure 9-5
Dynamic content of a new window can be created by a JavaScript
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Note that some HTML tags contain a forward slash (/), which has a particular meaning to the browser You ll need to precede these with a backslash (\), which tells the browser to ignore the special meaning
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Changing Content of Window</title> <script language="Javascript" type="text/javascript"> <!-function Window() { MyWindow = windowopen ('', 'myWin', 'height=250, width=250') MyWindowdocumentwrite('<html>') MyWindowdocumentwrite('<head>') MyWindowdocumentwrite ('<title> Writing Content<\/title>') MyWindowdocumentwrite('<\/head>') MyWindowdocumentwrite('<body>') MyWindowdocumentwrite ('<FORM action="http://wwwjimkeoghcom" method="post">') MyWindowdocumentwrite('<P>') MyWindowdocumentwrite 'Customer:<INPUT name="FirstName" type="text" \/>') MyWindowdocumentwrite('<BR>') MyWindowdocumentwrite ('<INPUT name="submit" type="submit" \/>') MyWindowdocumentwrite('<\/P>') MyWindowdocumentwrite('<\/FORM>') MyWindowdocumentwrite('<\/body>') MyWindowdocumentwrite('<\/html>') MyWindowfocus() } --> </script> </head> <body> <FORM action="http://wwwjimkeoghcom" method="post"> <P> <INPUT name="OpenWindow" value="Open Window" type="button" onclick="Window()"/>
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