JavaScript Tutorial HTML,JavaScript is integrated with browser & this integration enables the programmer to add dynamic interaction to the text, picture, information on the web page. JavaScript is case sensitive language i.e.; state is different from State or STATE (these are three different words for JavaScript). JavaScript is capable of sensing the events like mousing clicking, mousing moving etc. JavaScript files are directly executed when user double clicks on them or opens them in Browser.
Html is providing static web pages but with the developments in internet & World Wide Web the interactive communication became a necessity. The World Wide Web is a heap of pages having information in the form of text, graphics, pictures, sounds etc. Every page is linked to another page on web and the linked page …
HTML,JavaScript is integrated with browser & this integration enables the programmer to add dynamic interaction to the text, picture, information on the web page. JavaScript is case sensitive language i.e.; state is different from State or STATE (these are three different words for JavaScript). JavaScript is capable of sensing the events like mousing clicking, mousing …
No, JavaScript is not java. Java is a complex and much more powerful language like C & C++. While HTML, JavaScript are integrated with browser & this integration enables the programmer to add dynamic interaction to the text, picture, information on the web page. JavaScript is case sensitive language i.e.; state is different from …
HTML coders are not programmer but using JavaScript a html operator can do programming in a very simple way because JavaScript is very simple and easy to learn and understand. JavaScript is capable of making a static page as dynamic page, where the programmer can put variables. JavaScript has the ability to sense the events …
We should have knowledge of HTML before learning JavaScript. A JavaScript program can be typed in heador in body part of the HTML page or it could be attached externally to the web page.
Hardware Requirements Processor: 486 dx4 or above RAM: 16 MB VDU: VGA or SVGA HDD: 1.2 GB or above Software Requirements Operating System: Windows or Linux with browser Text Editor: Any text editor likes notepad or editplus etc.
A JavaScript program can be kept in html page under <script> JavaScript program </script> tag. We can place unlimited number of scripts in the html program in head or body section. Keeping JavaScript in head section If we want that the JavaScript program should be executed when it is called, then we should …
The number type deals with digits, It covers both floating point numbers and integers. Floating point numbers are like – 412.562, 9.2, 0.468 Integer numbers are like : 25, 1258, 968 Initializing number type variables Var age = 25 Var is javascript keyword, age is a variable name, 25 is …
String type deals with a single character or a series of characters enclosed with single quotes or double quotes respectively. Initializing string type variables var sect = ‘a’ var is JavaScript keyword, sect is a variable name, a is value assigned to sect variable, variable sect is of string type because the value …
Boolean type has only two values true and false. These constant values are case-sensitive. Initializing Boolean type variables var present = true var is JavaScript keyword, present is a variable name, true is value assigned to present variable, variable present is of Boolean type because the value assigned to present is of boolean …
Null type has only one value, null. The null value means ‘no data’ or this variable do not have any useful data. Undefined type has one value, undefined, undefined means nothing is stored in this variable. Undefined is not even null. Initializing null type variable var food = null var is JavaScript …
infinity is a property of a number. It represents mathematical infinity. Example Var infi= 1e400*1e350; Var is javascript keyword, infi is a variable name, 1e400 * 1e350 value assigned to infi variable. In the example given below we have used keyword document.write (message ) which is used to print the message or …
If we require many variables of same or different types then a problem of remembering names of variables and many functional problems will arise. Concept of array allows us to store different data type data pieces under the same name in an ordered way. It helps in creating many variables. There is no need of …
Alert box is a dialog box which displays a message in a small window with an OK button, user have to click on the ok button to proceed. Example <html> <head> </head> <body> <script type=”text/JavaScript”> alert(“Hit me to proceed”) document.write(” Have a nice day “); </script > </body> </html> Understanding the program: …
Prompt box is a dialog box which displays a message in a small window with a text box along with two buttons . One OK and other Cancel. Prompt method has ability to return the text kept with the prompt method’s text box , this value can be assigned to some variable and can be …
Confirm box is a dialog box which displays a message in a small window with two buttons. One Ok and other Cancel. This method can be used to get the response of user in positive by clicking on ok and in negative by clicking on cancel. The value returned by the confirm method in case …
Arithmetic operators are used in daily life, like adding , subtracting, multiplying , dividing etc. The arithmetic operators are supported by JavaScript are : Operator Description + Addition – Subtraction * Multiplication / Division % Modulus ++ Increment — Decrement Example <html> <head> </head> <body> <script type=”text/javascript”> var a=40; var b = …
As the name suggest these operators are used to assign values to variables. The right hand value or variable is assigned to the left hand variable. Different assignment operators are listed below with these use. Operator Description Example = This operator is used to assign value of variable/value only at right hand of it …
As the name suggest these operators are used to compare two variable values. The left hand variable is compared with the right hand operator using these operators. The answer returned after use of these expressions is a Boolean value which tell that whether comparisons is true or false. A programmer can program for either situation. …
A string operator joins two string values of two string variables and creates a third string value. String operators concatenates two strings. Even the value is numeric in a string variable it is also concatenated. Like “20” + “30” the answer will be 2030, not 50. Operator Description Example + This operator …