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function update_alert(){ windowalert("Welcome! This site is updated daily!"); } This function just calls the previous function function call_alert() { update_alert(); } call_alert(); This calls the call_alert() function to get things started

Notice that the update_alert() function is where all the real action happens Everything else is a function call The call_alert() function does nothing more than call the update_alert() function so that it is executed Finally, you see the command that starts the entire sequence, which is the call to the call_alert() function Since this is the first JavaScript statement outside a function, it is executed first When it is executed, it just calls the update_alert() function, which does the work of displaying the alert

FIGURE 13-4

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Most browsers would execute the preceding example without a problem even if you defined the update_alert() function after you called it However, there is a chance that some older browsers may not be as lenient and will want the function defined before it is called Also, if the function definition is too far down in the code to be loaded in time, it will not work correctly Thus, it is normally best to define a function before it is called

Dreamweaver synchronizes the files and adds the note Updated to the Status column for each file Click the Save Log button to save a copy of the synchronization report or click Close to close the dialog box (see Figure 13-5)

Now suppose that you want to create three functions to perform three tasks To make sure that they occur in the correct sequence, you can call them in order from within another function Here is an example of this technique with three functions that call alerts for various purposes:

function update_alert() { This function pops up windowalert("Welcome! This site is updated daily!"); an alert when called } function section_alert() { This function also pops windowalert("Please visit the picture section!"); up an alert when called } function links_alert() { This function also pops up windowalert("Also, check out my links page!"); an alert when called } function get_messages() { update_alert(); This function calls the other three section_alert(); functions into action when called links_alert(); } get_messages(); Calling the get_messages() function starts the process

FIGURE 13-5

The code begins by defining the three functions to show each alert Then it defines the get_messages() function, which just calls the previous three functions Of course, the get_ messages() function must be called to actually put this into action This call happens as the first statement outside of a function Of course, creating a script that pops up message after message is not something you typically want to do Although the example demonstrates the correct use of function calls, a script that does this would likely annoy your viewers! You ll see examples of practical uses of functions in later chapters

After you synchronize the files of your site, you can save a copy of the synchronization report by clicking the Save Log button

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The previous example used three different functions to show three alerts Although it works, it would be nice if you did not need to write a new function for each alert You can avoid doing this by using parameters You can create a function to be used multiple times to do the same thing, but with the new information from the parameters each time As mentioned earlier in the chapter, variables are commonly used as parameters However, you can also use a value as a parameter You ll learn about the different types of variable parameters first, and then take a look at value parameters If you want to send the values of certain variables to the function, you must first declare the variables and then be sure that they have the values you need before you send them Here, the scope of a variable becomes important The scope of a variable determines where it is and is not valid JavaScript has global and local variables

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