New PDF release: Actions and Events

By Paul Grice

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We'll be covering strings in more depth in Chapter 4 and looking at advanced string handling in Chapter 8. One thing you'll find yourself doing again and again in JavaScript is joining two strings together to make one string—a process that's termed concatenation. For example, we may want to concatenate the two strings "Hello " and "Paul" to make the string "Hello Paul". So how do we concatenate? Easy! We use the + operator. Recall that when applied to numbers, the + operator adds them up, but when used in the context of two strings, it joins them together.

Finally, if you have IE 4 installed and no script debugger, you'll see a plain dialog box pop up like that shown in Figure 2-10. Figure 2-10 Chapter 2: Data Types and Variables 33 34 Chapter 2: Data Types and Variables For the rest of the book, I'll show error dialog messages for Internet Explorer 6. Bear in mind, though, that it doesn't matter what your dialog box looks like, so long as you're getting an indication that an error has occurred and what caused it. Using Data—Calculations and Basic String Manipulation Now that we've seen how to cope with errors, we can get back to the main subject of this chapter: data and how to use it.

Make sure Navigator is not running. If it is, it may overwrite your changes when you edit the preferences file. 2. js using a text editor such as NotePad. The preference file is in the user's own directory under the Netscape\Users directory. js in \Users\ User name is either one you chose or sometimes it's just called default. Just in case things go wrong, it might be a good idea to save a backup version of the file elsewhere, before changing it. 3. js file. open_on_error", true); 4.

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Actions and Events by Paul Grice


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