Advanced JavaScript by Chuck Easttom

By Chuck Easttom

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The classic example is verifying a user’s form entries. Instead of sending the data as is to the server and validating the data types there, the client handles all the validation and only then sends the data to the server for further processing. Another application for LiveScript (JavaScript) is as the communication glue between HTML documents and Java applets. A scrolling banner, for example, can use information from the user’s customized settings, sent to the applet by LiveScript. This data exchange is transparent to the server and, since there is no server-client communication, there is no response time penalty.

That is the problem with the SRC attribute. When the browser comes across the tag that tells it to interpret JavaScript code in another file, it must first load that file. Such an action is time consuming. Most programmers say that efficiency is not as important as maintainability and clarity. However, with web page development, appearance is everything Chapter 2 Getting Started with JavaScript 16 n Chapter 2 and a slow-loading web site is unlikely to be successful. Always keep in mind that unnecessary HTTP hits to the server should be avoided.

String Literals String literals are delimited by either single or double quotes. You must terminate the string with the same type of quote you used to open it, so "Hi' is not a legal string in JavaScript. Unlike strings in most programming languages and shells, JavaScript does not distinguish between single and double quotes. They serve exactly the same purposes. , you cannot embed variables directly in the string and expect them to be replaced by the value they hold. Perl, for example, features variable interpolation (or variable substitution) because variables can be identified by the preceding $ character.

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