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You can call functions anywhere in your script code You can even call a function inside of another function A good rule to follow is to have the function definition come before the function call in the script The easiest way to be sure that your function definition comes before your function call is to place all of your function definitions as close to the beginning of the script as possible Defining a function before calling it is a suggestion for good coding practice, not a strict rule A function can be called anywhere in JavaScript, but the function code must be loaded by the browser before the function will work This is why it is suggested that you define your functions before calling them If you were to call a function that is defined near the bottom of a script, there is a chance it would not load in time to be executed Thus, it is normally best to define a function before it is called

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When adding scripts directly to a Web page rather than using an external file, making sure that variable and function declarations are in the head section often helps to ensure they are available when the script calls them in the body section However, since JavaScript often uses information from the document that may not have loaded yet, this could become problematic On the other hand, having a lot of JavaScript code in the body section can also be troublesome when you need to edit your HTML code (and if the JavaScript code is in the body section it needs to be after the element(s) that have the information JavaScript needs to use to ensure the necessary information is loaded) It is preferable to place all of your code into an external JavaScript file Then, you can decide whether you want to place the script tags in the head section or in the body section If a script needs no information from the document, placing the script tags in the head section works very well As an example, you will create a script that sends an alert message to the viewer as soon as the page is opened in the browser To have a message pop up in a small message box, you use a JavaScript method called windowalert First, you ll learn how to create a JavaScript alert, and then you ll see how to build a function that uses that method and call the function in a script

FIGURE 13-3

Rather than writing something to the screen with the documentwrite() method, you can create a JavaScript alert that pops up in a message box by using the windowalert method Like the documentwrite() method, the windowalert method takes the text string for the alert as a parameter, using this format:

windowalert("alert_text");

In the expanded Site panel, the remote site appears on the left, and the local site appears on the right

The string of text will be displayed in the alert pop-up box For example, suppose that you want to display This is an alert! in the pop-up box You would write the command in your external JavaScript file (we will use the filename js_alertjs for this example) like this:

To disconnect from the remote server, click the Connect button again or choose Site | Disconnect from the Site panel s menu As mentioned, if the remote server is on your local network, you don t need to click the Connect button To call up the structure of the remote site from the collapsed Site panel, choose Remote View from the drop-down menu to the right of the list of sites When you expand the Site panel, the remote site should appear on the left automatically If it doesn t, click the Site Files button

windowalert("This is an alert!");

Now you know how to make the alert pop up, but how can you get it to appear right as the page is opened You can do this by making sure the script is called before the body section of the Web page is loaded By placing the script tags inside the <head> and </head> tags of the document, as shown next, you ensure that it will be executed before the rest of the page is loaded:

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