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AppleScript: A Beginner s Guide
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3 Add a repeat while loop that runs as long as the value of the employee_code variable
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is an empty string, as shown in boldface here:
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set employee_code to "" repeat while employee_code is "" end repeat
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4 Inside the repeat while loop, add the statement for displaying the dialog box and
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assigning the text property of its result to the employee_code variable, as shown in boldface here:
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set employee_code to "" repeat while employee_code is "" display dialog "Please enter your employee code:" default answer "" with title "Employee Code" set employee_code to the text returned of the result end repeat
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5 Press z-R or click the Run button on the toolbar to run the script When the Employee
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Code dialog box appears, click the OK button without entering text AppleScript immediately displays the dialog box again
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6 This time, type one or more characters in the text-entry box, and then click the OK
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button The dialog box closes and doesn t reappear
7 Save the script under a name of your choice
Repeating Actions Until a Condition Becomes True
The last way of controlling loops in AppleScript is by repeating the loop as long as a specified condition is false and stopping when the condition becomes true This type of loop is called repeat until, and it s similar to the repeat while loop; often, you can achieve the same effect with both types of loops by structuring the condition differently The repeat until loop looks like this:
repeat until condition actions end repeat
9: Repeating Actions in Your Scripts
The following example uses a repeat until loop to close Finder windows until only one is left open:
tell the application "Finder" repeat until (count of Finder windows) is not greater than 1 close the back Finder window end repeat end tell
As with the repeat while loop, if the condition evaluates as true on the first check, the code inside the loop doesn t run at all
Try This
Using a repeat until Loop
In this example, you change the repeat while loop you created in the previous Try This example into a repeat until loop Follow these steps:
1 Open the script you created in the previous Try This example 2 Press z-SHIFT-S or choose File | Save As to display the Save As dialog box Save the
script under a different name The script looks like this:
set employee_code to "" repeat while employee_code is "" display dialog "Please enter your employee code:" default answer "" with title "Employee Code" set employee_code to the text returned of the result end repeat
3 Edit the repeat while employee_code is " " statement to make it a repeat until
statement The changes appear in boldface here; the rest of the script remains the same
repeat until employee_code is not ""
4 Press z-R or click the Run button on the toolbar to run the script You ll find it behaves
in the same way as before
5 Save the changes to the script
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Debugging and Handling Errors
AppleScript: A Beginner s Guide
Key Skills & Concepts
Understanding AppleScript errors Suppressing an error with a try block Creating an error handler Finding out which errors you need Making your scripts resistant to errors
n the best of all possible worlds, you ll write perfect code that always runs smoothly under ideal conditions But in the real world, your code will run into pitfalls and speed bumps as it executes, so it needs to be able to handle errors that occur The easiest way to handle an error is to suppress it by using a try block, but what you ll usually want to do is add error-handling code to your scripts An error handler enables a script to handle errors gracefully, no matter whether they re built-in AppleScript errors or custom errors that you cook up yourself First, though, you need to know what happens when an error occurs Let s start there
Understanding What Happens When an Error Occurs
When an error occurs, the script crashes For example, if you tell an application to do something impossible, such as to open a file that doesn t exist, it returns an error Figure 10-1 shows an example of a typical error message The message TextEdit got an error: Can t get document 1 Invalid index is intelligible enough if you know what the script is trying to do, which is to perform an action on the front document TextEdit can t get (return) document 1 because the index number is invalid in other words, there s no front document in TextEdit at the moment But when a user of the script runs into the error, the message will probably mean little to him or her ( an index of invalids ), and will be about as welcome as a fly in the soup AppleScript makes an exception to a script crashing when an error occurs When the user clicks the Cancel button in a dialog box, AppleScript returns a special error, error 128, which doesn t raise an error dialog box Instead, when error 128 occurs, AppleScript quietly stops running the script
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