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JS BASICS JAVA SCRIPT SCRIPTING
The document provides an introduction to JavaScript including definitions of scripting, client-side scripting, and server-side scripting. It discusses how JavaScript code can be placed in HTML files using <script> tags and describes common JavaScript elements like variables, data types, operators, and code structure.
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JS BASICS JAVA SCRIPT SCRIPTING
- 1.UNIT – IIIJAVASCRIPTArulkumar V P
- 2.Introduction: Scripting• Scripting:Scripting is an easy way of automating the processwhich is needed to be done step-by-step by a user.• Scripting languages: do not require the compilation step andare rather interpreted. For example, normally, a C program needsto be compiled before running whereas normally, a scriptinglanguage like JavaScript or PHP need not be compiled.• Applications of Scripting Languages :1.To automate certain tasks in a program2.Extracting information from a data set3.Less code intensive as compared to traditional programminglanguages
- 3.Introduction: Types ofScripting• Client scripting can be defined as a code that is present ina client’s HTML page.• It is usually attached to the browser in a language that iscompatible with the browser.• The browser then downloads that code temporarily andprocesses it without the server. If additional information isrequired, a request is raised and sent to the server.• Client-side programming languages are :1) Javascript2) VBScript3) HTML4) CSS5) AJAX6) jQuery etc.
- 4.Introduction: Types ofScripting• Server-side scripting is a method of designing websitesso that the process or user request is run on theoriginating server.• Server-side scripts provide an interface to the user andlimit access to proprietary data and help keep control ofthe script source code.• which produce a response customized for each user's(client's) request to the website.• Server-side programming languages are :ASP .NET, PHP, C++, Java and JSP, Python, Ruby on Rails, R
- 5.Introduction: Types ofScriptingCLIENT SIDE SCRIPTING SERVER SIDE SCRIPTINGSource code is visible to user. Source code is not visible to userbecause its output of server side isa HTML page.It usually depends on browserand it’s version.In this any server side technologycan be use and it does not dependon client.It runs on user’s computer. It runs on web server.There are many advantages linkwith this like faster. responsetimes, a more interactiveapplication.The primary advantage is its abilityto highly customize, responserequirements, access rights basedon user.
- 6.Introduction: Types ofScriptingCLIENT SIDE SCRIPTING SERVER SIDE SCRIPTINGIt does not provide security fordata.It provides more security for data.It is a technique use in webdevelopment in which scriptsruns on clients browser.It is a technique that uses scriptson web server to produce aresponse that is customized foreach clients request.HTML, CSS, javascript andVBScriptASP, PHP, Python, Java and Ruby
- 7.Introduction: JavaScript• JavaScriptis the most popular scripting language on theinternet, and works in all major browsers, such as InternetExplorer, Firefox, Chrome, Opera, and Safari.• What is JavaScript?• JavaScript is a scripting language• JavaScript is usually embedded directly into HTML pages• JavaScript was designed to add interactivity to HTML pages• JavaScript is an interpreted language (means that scriptsexecute without preliminary compilation)
- 8.Introduction: JavaScript• Everyonecan use JavaScript without purchasing a license.• JavaScript is Netscape's cross-platform, object-orientedscripting language.• Core JavaScript contains a core set of objects, such asArray, Date, and Math, and• A core set of language elements such as operators,control structures, and statements. Core JavaScript canbe extended for a variety of purposes by supplementing itwith additional objects.
- 9.Introduction: JavaScriptWhat cana JavaScript do? (Applications)• JavaScript gives HTML designers a programming toolHTML authors are normally not programmers, but JavaScriptis a scripting language with a very simple syntax! Almostanyone can put small "snippets" of code into their HTMLpages• JavaScript can put dynamic text into an HTML page - AJavaScript statement like this:document.write("<h1>" + name + "</h1>") can write avariable text into an HTML page• JavaScript can react to events - A JavaScript can be set toexecute when something happens, like when a page hasfinished loading or when a user clicks on an HTML element.
- 10.Introduction: JavaScriptWhat cana JavaScript do?• JavaScript can be used to validate data - A JavaScriptcan be used to validate form data before it is submittedto a server. This saves the server from extra processing• JavaScript can be used to create cookies - A JavaScriptcan be used to store and retrieve information on thevisitor's computer• JavaScript can read and write HTML elements - AJavaScript can read and change the content of an HTMLelement
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