Advanced JavaScript, Third Edition by Chuck Easttom

By Chuck Easttom

Complicated JavaScript 3rd variation offers an in-depth exam of an important good points of JavaScript. starting with an outline of JavaScript, the booklet fast strikes into extra complex gains wanted for advanced but strong JavaScript scripts, equivalent to items, arrays, and date and time capabilities. also, a variety of positive aspects of JavaScript which are crucial for contemporary websites are mentioned, together with manipulating the prestige bar, growing dynamic calendars, and dealing with types, photos, and the rfile item version. quite a few examples illustrate how you can enforce numerous concepts. issues coated: the way to increase your web content with LED symptoms, banners, and pictures enforcing cookies to shop and retrieve details The constitution of the record item version and the way it may be used to view, entry, and alter an HTML rfile security features to guard deepest info whereas utilizing the web

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To attract visitors, you can enhance a web page with JavaScript in many different ways. We have introduced a few client-side JavaScript scripts in this section. Although client-side JavaScript is by far the most important and useful, there are many other implementations of the language. For example, you can use JavaScript for server-side applications using the LiveWire compiler. Server-side JavaScript is actually an alternative to traditional CGI programming via Perl and C++. JavaScript is a very convenient language; thus, it is Chapter 1 Introduction to JavaScript 10 n Chapter 1 used alongside many other languages and for various purposes.

However, when your code has multiple operations in a single line, it is usually a good idea to use parentheses to clarify what you want to occur: 3 * 4/2 + 1 can be ambiguous, whereas 3 * ((4/2) + 1) is very clear. C, C++, and Java programmers will already be familiar with the increment and decrement operators. The increment operator is formed by placing two plus signs after a variable, such as this: var somenumber somenumber++ This line of code increments the value of somenumber by one. Had we written: somenumber-- it would have decreased the value by one.

All of these are part of that Document Object Model. Furthermore, JavaScript can be used to trap user-initiated events such as button clicks, link navigation, and other actions that the user explicitly or implicitly initiates. You can create a distinct script for each event, enabling a smooth, logical interaction with the user. What Can JavaScript Do? In this section we take a look at a few interesting effects and programs created entirely with JavaScript. At this point we will only focus on client-side JavaScript that is embedded in or referenced by an HTML document.

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