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Interview Questions
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Introduction to JavaScript

JavaScript is used in millions of Web pages to improve the design, validate forms, detect browsers, create cookies, and much more.

JavaScript is the most popular scripting language on the internet, and works in all major browsers, such as Internet Explorer, Mozilla, Firefox, Netscape, and Opera.

JavaScript and memory leaks

Credits: This tutorial is written by Volkan. He runs the site Sarmal.com, a bilingual site featuring all his work, products, services, and up-to-date profile information in English and Turkish.

If you are developing client-side re-usable scripting objects, sooner or later you will find yourself spotting out memory leaks. Chances are that your browser will suck memory like a sponge and you will hardly be able to find a reason why your lovely DHTML navigation's responsiveness decreases severely after visiting a couple of pages within your site.

How to Populate Fields from New Windows Using JavaScript

It isn’t uncommon for users to have difficulty filling out forms on web pages. A lot of the time, they need help with filling out various fields with headings such as: “Where is that number on my check?” “Why do I need to give you my email address?” “What is a URL?” These questions and more are usually answered by clicking a little question mark next to a field, which opens a popup window providing more information and/or an illustration. In this article, I’ll show you how to enhance the functionality of these popup windows by allowing the person to fill out the information there. This will enhance the user experience for a number of reasons:

Welcome To JavaScript for the Total Non-Programmer

This tutorial will take you step by step through the fundamentals of Javascript. You will learn how to write functions, use data from text boxes, create IF-THEN conditionals, program loops, and generally make your web page "smarter."
I teach computer classes for a living to corporate clients of all levels. After 2 years of teaching, I have learned a lot about communication between people of various levels of computer experience. This tutorial assumes that you have no prior programming experience, but that you have created your own HTML pages.

Where to Put the JavaScript

JavaScripts in a page will be executed immediately while the page loads into the browser. This is not always what we want. Sometimes we want to execute a script when a page loads, other times when a user triggers an event.
Scripts in the head section: Scripts to be executed when they are called, or when an event is triggered, go in the head section. When you place a script in the head section, you will ensure that the script is loaded before anyone uses it. 

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