What Is JavaScript? A scripting language based on an object-orientated programming philosophy.
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1 What Is JavaScript? A scripting language based on an object-orientated programming philosophy. Each object has certain attributes. Some are like adjectives: properties. For example, an object might have a, a size, and a text value. Some are like verbs: methods. For example, an object might be able to display a text message, record information, or create an alert box. What Is a Scripting Language? Scripts are a set of directions to a computer. JavaScript and VBScript are two of the most common scripting languages in use today. A program such as a web browser translates the text script into computer commands. What is the Difference between Java and JavaScript? Java is a compiled language written and then packaged into a self-executing file. To create an application with a compiled language, you typically need a special programming tool or development environment. With JavaScript, you can write a script with a text editor (Notepad, SimpleText, etc.). A script is just plain ASCII text. What Makes Up JavaScript? JavaScript contains several elements: Objects. Objects are building blocks of the script. JavaScript contains pre-defined objects, and you can create your own: document form, etc. An object has properties ("adjectives"):. ("goeshere"); An object has methods ("verbs"): document.write ("Hello!"); Operators. Operators can assign, compare, compute, and evaluate values. Operators combined with objects and variables form expressions. =, +, *, <, etc.
2 if {bears > 1 && bears < 4) then.alert ("You can probably survive this attack."}; Variables. Variables are containers that hold data. The current value in a variable can be calculated, output, passed along to other variables, etc. You can declare a variable at the beginning of a page and use it throughout the document, or you can declare a variable at the beginning of a function for just that particular function. var user = prompt ("Enter your user", "") Functions. They combine a series of statements under one and perform an action. function postmessage() {alert("are you ready?");} Events and Event Handlers. Events and event handlers respond to certain events (from the user/browser). <body onload = "postmessage()"> Arrays. Sets of variables that are saved under the same. var pages = new makearray("select a Page", "CDPL", "L571 syllabus", "IBM", "ESPN", "IU"); Where Do You Insert a Script? Depending on the use, you insert your scripts within an HTML page... Within an HTML document, marked by the <script> tag. Within an HTML tag as an event and event handler. Within an anchor tag to call a JavaScript function.
3 Hierarchy Objects Object Properties Methods Event Handlers defaultstatus frames er parent scroll self status top alert confirm prompt cleartimeout settimeout onload onunload onblur onfocus frame defaultstatus frames er parent scroll self status top alert confirm prompt cleartimeout settimeout location hash host host href path por protocol search reload replace history length forward go back navigator appcodename appname appversion mimetypes plugins useragent javaenabled document alinkcolor anchors applets area bgcolor cookie fgcolor forms clear write writeln
4 image form text images lastmodified linkcolor links location referrer title vlinkcolor border complete height hspace lowsrc src vspace width action elements encoding FileUpload method target defaultvalue type value none submit reset select onsubmit onreset onblur oncharge onfocus onselect Built-in Objects Object Properties Methods Event Handlers array length join reverse sort xx date none getdate getday gethours getminutes getmonth getseconds gettime gettimezoneoff set getyear parse
5 string length prototype prototype setdate sethours setminutes setmonth setseconds settime setyear togmtstring tolocalestring UTC anchor big blink bold charat fixed fontcolor fontsize indexof italics lastindexof link small split strike sub substring sup tolowercase touppercase Window
Javascript Hierarchy Objects Object Properties Methods Event Handlers. onload onunload onblur onfocus
Javascript Hierarchy Objects Object Properties Methods Event Handlers Window Frame Location History defaultstatus frames opener parent scroll self status top window defaultstatus frames opener parent scroll
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