What is the scope of the Java scripting language

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The scripting language JavaScript was developed to be able to display dynamic HTML documents in the web browser. The processing of JS code is mostly done directlyt in the user's web browser. With the Programming language Java JavaScript doesn't have much in common, however.

History of JavaScript development

The scripting language was originally developed by Netscape under the Designation LiveScript developed. The aim of the Netscape developers was to make dynamic HTML content displayable directly in the user's web browser. The use of JavaScript should give developers the opportunity to static HTML documents Enriching it with dynamic elements, interpreting user actions and reacting accordingly, changing website content dynamically and generating and displaying content on demand.
The Java programming language experienced an unprecedented soaring in the second half of the 1990s and was used by many developers to interactive desktop and web applications to program. As a result of a collaboration with the IT giant Sun Microsystems, which introduced the Java programming language to the general public in 1995, Netscape decided to name their new language, based on the Sun Microsystems programming language, JavaScript. However, these are shared both languages ​​have almost nothing in common.

Netscape released JS in 1995. It was an integral part of the Netscape Navigator web browser, which was very popular at the time. Benefited by the rapid spread of the internet in the late 1990s-Years, JS spreads very quickly. Over the years, the scripting language has been continuously developed and implemented new functions and features addedso that JS is nowadays one of the basic languages ​​of the World Wide Web alongside PHP (LINK) and Python (LINK).

Scripting language is very dynamic and extremely flexible

The independence of specific web browsers has contributed significantly to the success of JavaScript. The scripting language itself is srather dynamic and extremely flexible. It has object-oriented properties and provides support for different programming paradigmssuch as procedural, object-oriented, or functional paradigms. Nowadays, thanks to Node.js, JavaScript can not only be client-side in the context of a web browser but also directly on a web server (Apache or nginx).

Which projects can you realize with JavaScript?

Many different projects and functions can be implemented by using JS.

In the following, we will go into common areas of application of JavaScript:
- dynamic changes to website content
- Creation of interactive menus
- Update of HTML elements and data without reloading the entire website
- Modification of texts or graphics through actions of the user

Differentiation from the Java scripting language

Although JavaScript and Java have a similar names however, the two programming languages ​​only share few similarities. Java is an object-oriented, full-fledged programming language that offers a much larger range of functions and a set of commands than JavaScript. Experts see Javaas a derivative of C ++ at.
JavaScript, on the other hand, is a scripting languagewhich basically cannot be run alone. JS scripts require a runtime environment such as the web browser or Node.js in order to be executed. JavaScript was originally intended to be used only in the browser. In the meantime, however, JS scripts can also be executed directly on the web server independently of the browser.

Security aspects

With the possibilities that JavaScript brings with it, there are just as many security-critical aspects when executing JS scripts. Many of these problems are effectively solved by the so-called "sandbox principle". All command lines are executed by the browser in an isolated area and only have access to the Web browser resources and not the entire computer.
So will access to the file system through the sandbox prevented. In addition, modern web browsers such as Chrome or Firefox run every website, web application or domain that is accessed in isolation from one another. This complicates the Data exchange between the individual entitieswhich minimizes the risk of so-called "cross-site scripting attacks".

JavaScript in the context of search engine optimization

Search engines usually do not analyze the JS code. Search engine crawlers cannot take advantage of dynamic interaction. A crawler visits the website like a visitor who has JavaScript explicitly deactivated in the web browser. As a result, a web crawler cannot reach websites written in JavaScript. This has negative consequences for the search engine ranking of the affected website.

Further problems at JS

It happens again and again that website operators try to get JS code for to abuse one's own interests. For example multiple pop-up windows without the consent of the user opened automatically. Other functions that can be used to abuse the JS code are:
- unwanted changes to the browser window
- camouflaging dodgy links and internet addresses
- the deliberate deactivation of context menus for saving and copying web content

/ by Daniel FaustKeywords:Java, Java Script, JavaScript, JS, Netscape, scripting language