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lighter the value; so the values 255, 255, 255 whiten the canvas and thereby erase existing images from the canvas Next, a filled rectangle is drawn on the screen The color of the filled rectangle is white, and drawing the rectangle has the effect of erasing images from the canvas The first two parameters of the fillRect() method are the coordinates of the upper-left corner of the rectangle The last two parameters are the width and height of the rectangle You ll learn more about drawing rectangles later in this chapter Once the canvas is erased, the color is set to red, and then the drawString() method, which actually paints text on the canvas, is called There are four parameters to the drawString() method The first parameter is the string of text that will be painted on

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Add Interactive Elements to a Web Site As a team, review the presidential Web site you created in 9 (see page 273) Look for opportunities to add interactivity

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e = -(payPerYear * numYears); b = (intRate / payPerYear) + 10; denom = 10 - Mathpow(b, e); return numer / denom; } }

} catch (Exception error) { alert = new Alert("Error Closing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } if (RecordStorelistRecordStores() != null) { try { RecordStoredeleteRecordStore("myRecordStore"); recordEnumerationdestroy(); } catch (Exception error) { alert = new Alert("Error Removing", errortoString(), null, AlertTypeWARNING); alertsetTimeout(AlertFOREVER); displaysetCurrent(alert); } } } } }

Select two types of interactive elements to add to the site These elements may include: Rollover buttons Update information Forms Jump menus Use a web diagram like the one below to brainstorm which elements you will add and the purpose that each element will serve on the Web page

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The first thing to notice about RegPayS is that it has only two methods: doGet( ) and compute( ) The compute( ) method is the same as that used by the applet The doGet( ) method is defined by the HttpServlet class, which RegPayS extends This method is called by the server when the servlet must respond to a GET request Notice that it is passed a reference to the HttpServletRequest and HttpServletResponse objects associated with the request From the request parameter, the servlet obtains the arguments associated with the request It does this by calling getParameter( ) The parameter is returned in its string form Thus, a numeric value must be manually converted into its binary format If no parameter is available, a null is returned From the response object, the servlet obtains a stream to which response information can be written The response is then returned to the browser by outputting to that stream Prior to obtaining a PrintWriter to the response stream, the output type should be set to text/html by calling setContentType( ) RegPayS can be called with or without parameters If called without parameters, the servlet responds with the necessary HTML to display an empty loan calculator form Otherwise, if called with all needed parameters, RegPayS calculates the loan payment and redisplays the form, with the payment field filled in Figure 32-7 shows the RegPayS servlet in action

FIGURE 32-7

Listing 8-10 The JAD file for Listing 8-9

After you have decided which elements to include: 1 Use the Dreamweaver tools that you have learned about in this chapter to add the interactive elements to the site 2 Test each element in at least two Web browsers Do they work the same way in both browsers If they work differently, describe the differences

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