Embed Size (px)
Citation preview
CS-3432Electronic Commerce
Lecture – 13Sikandar Shujah Toorhttps://sites.google.com/site/uolcsecom
onmouseover & onmouseout<HTML><HEAD><title>Onmouseover event</title></head><BODY><IMG SRC=moon.jpg WIDTH=200 HEIGHT=100 BORDER=0 NAME=pictureonmouseover="picture.src='moon.jpg';picture.width=500;picture.height=350"onmouseout="picture.src='leopard.jpg';picture.width=600;picture.height=450"></BODY></HTML>
onmouseover & onmouseout
<HTML><BODY><A href=leopard.jpg
onmouseover="picture.src='moon.jpg';picture.width=500;picture.height=300"onmouseout="picture.src='moon.jpg';picture.width=170;picture.height=50"><IMG SRC=moon.jpg WIDTH=200 HEIGHT=100 BORDER=2NAME=picture></A></BODY></HTML>
Anchor
Operators in JavaScript
• + For addition of two numbers and concatenation of two strings• - for subtraction of two numbers• * for multiplication of two numbers• / for division of two numbers• % modulus (calculating the remainder)• ++ increment in number• -- decrement in number
Logical Operators
• && logical and • || logical or• ! logical not• if(x<y&&x<z) { any statement }• if(!false){ statement }
Comparison Operators• == Equal• != not equal• < Less than• <= less than equal• > Greater than• >= Greater than equal
<HTML><HEAD><TITLE>Javascript Example</TITLE><SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">
alert("Thank you for visiting our web site!")</SCRIPT></HEAD><BODY></BODY></HTML>
Java Script Example
Writing on a Page<HTML><HEAD><TITLE>example-writing on the page</TITLE></HEAD><BODY><SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript"><!--document.write("Hello! Thank you for visiting our site.")//--></SCRIPT></BODY></HTML>
Writing on a Page
Functions Definition• Function is a block of code which is
executed when someone calls it• Defined as followsfunction my1stfunction(arg1, arg2, arg3)
{// some code
}•When called, variables and arguments must
be in expected order
Displaying System Date<!DOCTYPE html><html><head><script>function displayDate(){document.getElementById(“systemdt”).innerHTML=Date(); }</script></head><body><h1>My First JavaScript</h1><p id=“systemdt">This is a paragraph.</p><button type="button" onclick="displayDate()">Display Date </button></body></html>
<HTML><script language="JavaScript"><!--function Addit(){
var num1=document.Calform.fst.value;var num2=document.Calform.scnd.value;alert(parseFloat(num1)+parseFloat(num2));
}
function minus(){var num1=document.Calform.fst.value;var num2=document.Calform.scnd.value;alert(parseFloat(num1)-parseFloat(num2));
}//--></script><BODY>Add and Subtract Calculator<FORM name="Calform"><P>1st Number:<INPUT TYPE="TEXT" NAME="fst" maxlength="3"><P>2nd Number:<INPUT TYPE="TEXT" NAME="scnd" maxlength="3"><P><INPUT TYPE="button" NAME="Add" VALUE="Add" onclick="Addit()"><INPUT TYPE="button" NAME="Minus" VALUE="Subtract" onclick="minus()"><INPUT TYPE="RESET" VALUE="Reset"></FORM> </BODY></HTML>
Simple Calculator
Simple Calculator – Add
Simple Calculator – Minus
Loops• Loops executes a block of code repeatedly
until a condition is met• Following types of loops present in JS• For loop
for(intialization;condition;increment){statements}• While loop while(codition){statements}• Do while loop do{statements}while(condition)• Do-while loop executes at least once
For Loop<HTML><HEAD><TITLE>Using the For Loop</TITLE></HEAD><BODY><SCRIPT>for(i=1;i<7;i++)
document.write("<H"+i+">For Loop Example "+i+“ !! </H“+i+“>");
</SCRIPT></BODY></HTML>
For Loop Example
While Loop<HTML><HEAD><TITLE>Using the While Loop</TITLE></HEAD><BODY><SCRIPT><!--var i = 1;while (i < 7){
document.write("<H"+i+">While Loop Example "+i+"!!</H"+i+">"); ++i;}//--></SCRIPT>
</BODY></HTML>
While Loop Example
Do-while Loop<HTML><HEAD><TITLE>Using the While Loop</TITLE></HEAD><BODY><SCRIPT><!--var i = 1; do {
document.write("<H"+i+">Do-While Loop Example "+i+"!!</H"+i+">"); ++i; } while (i < 1);//--></SCRIPT></BODY></HTML>
• Loop executed once although the condition is false from the beginning
Do-while Loop Example
Java Script Objects• Everything in Java Script is an Object which is a combination
of data, properties and methods• Properties are the values associated with the object• Methods are the actions which can be performed on the
object• New objects can be inherited with “new” key word• person = new Object()
• Object Properties can be set / retrieved by using “.” after object name• person.name=“Uzair”;
• Methods can be called by the same “.” after object name• var name = persone.getName();
Some Predefined JS Objects
• Global• Array • String •Math• Date… etc.
Example of Math object<HTML><HEAD><TITLE>Using the Math object</TITLE></HEAD><BODY><H1>Using the Math object </H1><SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript"><!--document.write("Math.PI :" +Math.PI +"<P>");document.write("Math.LN2 :"+Math.LN2+"<P>");document.write("Math.sin(90) :"+Math.sin(90)+"<P>");document.write("Math.random() :"+Math.random()+"<P>");document.write("Math.pow(2,3) :"+Math.pow(2,3)+"<P>");document.write("Math.min(123,133): "+Math.min(123,133)+"<P>");//--></SCRIPT></BODY></HTML>
Math Object Example
Array Object
<HTML><HEAD><TITLE>Using Arrays </TITLE></HEAD><BODY><H1>Using Arrays </H1><SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript"><!--myArray=[0,1,2,3,4,5,6,7,8,9,10];document.write("myArray: first element " +myArray[0]+"<P>");document.write("myArray.toString(): "+myArray.toString()+"<P>");document.write("myArray.join(':'): "+myArray.join(':')+"<P>");document.write("myArray.reverse(): "+myArray.reverse()+"<P>");document.write("myArray.sort(): "+myArray.sort()+"<P>");//--></SCRIPT></BODY></HTML>
Array Object
![2015 - Bob Van Toor - ReflectingAbsenceorHowGroundZeroWasPurgedofItsMate[Retrieved 2015-07-28]](https://img.pdfslide.us/doc/110x75/56d6c0a91a28ab30169b4d34/2015-bob-van-toor-reflectingabsenceorhowgroundzerowaspurgedofitsmateretrieved.jpg)
