Using JavaScript in web design

Abstract

JavaScript was created to bring a web page to life. Scripts are programs written in JavaScript. Each script is connected directly to HyperText Markup Language (HTML) in any browser and is immediately executed when the web page is loaded. JavaScript scripts are written in plain text that does not require special training, which is why JavaScript is very different from the Java programming language, to which it is very similar. A special interpreter program allows JavaScript to be used not only in the browser but anywhere, and therefore the process of executing script commands is called “interpretation.” The interpreter executes the program’s JavaScript ource code (script) “as is” in browsers. Modern interpreters convert JavaScript to machine code before execution, optimize it, and only then perform it. Because of this, JavaScript is very fast. All known browsers have a JavaScript interpreter built into them, which is why they can execute scripts on the page. However, JavaScript can be used outside of the browser. This is a full-fledged language, with programs that can be run on a server and even on consumer electronic devices, if they have the appropriate interpreter installed. This article presents various JavaScript applications, used by the author, embedded in HTML files that allow a web designer to make a text animation presentation on a web page, to make a slide show, to create a questionnaire with ready-made answers so that the user reading the web page can easily master the necessary material contained in the questionnaire, to conduct an exam with the user on any topic of interest to him or her in a multitask mode with assessments of the exam results and a table of correct answers, place scientific applications on the web page, for example, a table of chemical elements by Mendeleev with printing of all parameters of a chemical element at the request of the user or calculators that the user can use online. The author has managed to build HTML using JavaScript that allows displaying beautiful Java applets accompanied by a banner, designed as a Java applet, contained within a moving window that expands from the left end and moves to the right end at the top of the web page.