Q.1 What is JavaScript?
ANSWER: JavaScript is a general-purpose programming language designed to let programmers of all skill levels control the behavior of software objects. The language is used
most widely today in Web browsers whose software objects tend to represent a variety of HTML elements in a document and the document itself. But the language can
be--and is--used with other kinds of objects in other environments. For example, Adobe Acrobat Forms uses JavaScript as its underlying scripting language to glue
together objects that are unique to the forms generated by Adobe Acrobat. Therefore, it is important to distinguish JavaScript, the language, from the objects it can
communicate with in any particular environment. When used for Web documents, the scripts go directly inside the HTML documents and are downloaded to the browser with
the rest of the HTML tags and content.
ANSWER: JavaScript is a platform-independent,event-driven, interpreted client-side scripting and programming language developed by Netscape Communications Corp. and Sun
Microsystems.
Q.2 How is JavaScript different from Java?
ANSWER:JavaScript was developed by Brendan Eich of Netscape; Java was developed at Sun Microsystems. While the two languages share some common syntax, they were developed
independently of each other and for different audiences. Java is a full-fledged programming language tailored for network computing; it includes hundreds of its own
objects, including objects for creating user interfaces that appear in Java applets (in Web browsers) or standalone Java applications. In contrast, JavaScript relies
on whatever environment it's operating in for the user interface, such as a Web document's form elements.
JavaScript was initially called LiveScript at Netscape while it was under development. A licensing deal between Netscape and Sun at the last minute let Netscape plug
the "Java" name into the name of its scripting language. Programmers use entirely different tools for Java and JavaScript. It is also not uncommon for a programmer of
one language to be ignorant of the other. The two languages don't rely on each other and are intended for different purposes. In some ways, the "Java" name on
JavaScript has confused the world's understanding of the differences between the two. On the other hand, JavaScript is much easier to learn than Java and can offer a
gentle introduction for newcomers who want to graduate to Java and the kinds of applications you can develop with it.
Q.3 What’s relationship between JavaScript and ECMAScript?
ANSWER: ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3.
Q.4 How do you submit a form using Javascript?
ANSWER: Use document.forms[0].submit();
(0 refers to the index of the form – if you have more than one form in a page, then the first one has the index 0, second has index 1 and so on).
