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Figure 8-4 The run handler, which was implied in Script 8-3, is described explicitly here Now, looking at the script in Figure 8-4, things come into focus a bit The user_name variable was declared in the run handler and therefore not recognized in the say_hello handler You can remedy this problem with a couple of solutions You can either tell the handler what the value is by passing it as a parameter to the say_hello command or make the variable visible to all handlers in the script by declaring it as a property or global variable Up front, the second choice sounds simpler why pass a value as a parameter to multiple handlers when you can just make it directly visible to all handlers One good reason is portability.

This may not seem like a big deal at the start, but later, when you try to take those brilliant handlers you created and use them in a different script, figuring out which global variables or properties are used by the handler may just drive you out of your mind You may also start with code that is part of the run handler, then choose to move it to a handler, and finally, when the script gets too long, choose to port some of the handlers to a separate library Variables make handlers harder to test and debug individually If a handler uses only local variables, it should be easy to call it directly, passing it test data as parameters and checking that the value it returns is correct.

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program can get quite large with all those MOVE blocks being added. This is where the concept of the My Block comes in handy. Take a look at Figure 26-4, and then I ll explain what you are seeing.

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If a handler uses global variables too, you ll also need to assign test data to those before calling the handler and then check that their values are still correct once the handler is finished Perhaps the best reason to avoid gratuitous globals, however, is that they make your scripts harder to read and understand One of the big advantages of handlers is that they allow you to split up a large, complex script into lots of small, simple units that can be understood and worked on independently while ignoring the rest Because a global variable is visible to every part of the script, any part of the script is able to use or change it at any time.

This means to work safely on a piece of code that uses global variables, you must also pay close attention to all the other parts of the script that share this variable that s a lot of extra factors to juggle in your head when you want to concentrate on just one..

Similar to text(text) method is the .html(HTML) method. This method sets the HTML contents of the selected element(s). To set the HTML contents of the h2 element, we would use the following statement: $('h2').html('JavaScript Libraries');

Although these issues aren t so important in small scripts where the code is simple and easy to understand all at once, in a large script with many handlers and lots of global variables, keeping track of all these extra connections and making sure they all interact correctly can be a lot of extra work. Despite a handler needing many variables in some cases, it is almost always better to pass them as arguments rather than declare them as global variables, especially if the reason for it is blatant laziness. I ll discuss the justifiable exceptions to this rule later in the Understanding When Properties Are a Good Idea section.

Although AppleScript handlers are always the same wherever you go, you can specify their parameters in a couple of ways: by position or by label. 17 covers the two methods extensively, but this section contains a primer for passing values by position, which is the simpler way. To pass a value to a handler, you include it in the parentheses following the handler name. Figure 8-5 shows how you can do that.

Figure 8-5. Passing the value of the user_name variable to the say_hello handler What s important to understand is that what you re passing isn t the variable but rather the value of the variable. The user_name variable in the run handler is completely separate from the one in the say_hello handler that is, they re two different variables that just happen to use the same name. The two scripts shown in Script 8-4 and Script 8-5 should help to make this clear. Script 8-4. on run set user_name to "Ben" say_hello(user_name) end run on say_hello(somebody) display dialog ("Hello " & somebody & "!") end say_hello

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