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A pie graph is a particularly useful way of representing relative proportions, or percentages, of a whole. Let s consider the example where you want to display a pie graph showing the geographic proportion of your customer base. NOTe If you want to follow this example, you will have to create a new view object based on the following select statement and add it to the application module:

Notice the Result area in Figure 12-16. Until now, the result record had a single property labeled button returned. Now, it has another property: text returned.

Figure 12-16. The text returned property of the dialog reply record contains a string that is the text the user typed.

Only dialog box commands that include the default answer parameter will have the text returned property in the dialog reply record. Later in the Validating User-Entered Text section, you will learn different ways to validate the text that users enter.

SELECT COUNT(CUSTOMER_ID), CUSTOMERS.NLS_TERRITORY NLS_TERRITORY FROM CUSTOMERS GROUP BY CUSTOMERS.NLS_TERRITORY

A display dialog dialog box will normally remain on the screen until manually dismissed by the user. You can, however, take control of the length of time the dialog box lingers by using the giving up after parameter. Consider the following display dialog command: display dialog "Click this within ten seconds!" giving up after 10 If you clicked the OK button within ten seconds, the dialog box would return this result: {button returned:"OK", gave up:false} Otherwise, the dialog box would automatically close itself, and the result would be as follows: {button returned:"", gave up:true} As you can see, using the giving up after parameter is responsible for the gave up property in the dialog reply record. The value of the gave up property is Boolean, and it is true if the dialog box gave up since no one clicked any button. It s false if the user clicked a button. Script 12-1 shows an example of how you can use the giving up after parameter for speed quizzing. Script 12-1. set dialog_reply to display dialog "5472 57 =" buttons {"56", "76", "96"} giving up after 7 if (gave up of dialog_reply) then set qResponse to "Not fast enough!" else if button returned of dialog_reply is "96" then set qResponse to "You got it!" else set qResponse to "Wrong answer" end if end if display dialog qResponse The preceding script places the dialog reply record in the variable dialog_reply. The script counts on that the dialog reply record will contain a gave up property that will have a Boolean value.

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The nature of asking the user to enter data involves expecting a certain type of data. When the data you expect is a string, such as the user s name, a city, or a company name, you may want to check that the field isn t empty or is a certain length. This is rather easy to do, since AppleScript returns a string as the text returned item in the dialog reply record.

As before, drag and drop the data collection, but this time choose to display it as a pie graph. JDeveloper will prompt for the relevant information to create a binding. In the case of a pie graph, Pie represents the data you want to display, CountCustomerId, and Slices defines how that data set is proportioned, NlsTerritory.

You may, however, run into issues when you expect the user to enter a value that has to be later converted into a valid date or integer or has to be a specially formatted string such as an e-mail address or uniform resource locator (URL) The method I found most effective is to put the dialog box inside an endless repeat loop that won t relent until the user either enters a conforming string or cancels As an example, imagine you want the user to enter a meeting date and that the date, besides being a valid date, has to be in the future What you ll need is a variable that will hold the final date You can start the script by creating the loop and displaying the dialog box: repeat set dialog_reply to display dialog "Enter date" default answer "" --more script here...