IT Job Careers: September 2013

Monday, September 30, 2013

JavaScript External Functions Linking To HTML Page

Filename: functions.js
====================================
// JavaScript Document

// Function With no Arguments and no return type
    function line1() // called function
    {
        document.write("<br/>**********################***********<br/>");
    }

    // Function With Arguments and no return type
    function line(s, n) // called function
    {
        document.write("<br/>");
        for(i=0; i<n; i++) {
            document.write(s);
        }
        document.write("<br/>");
    }

// Function With both Arguments and return type
    function clac(x, s, y) // called function
    {
        switch(s)
        {
        case '+': return(x+y); break;
        case '-': return(x-y); break;
        case '*': return(x*y); break;
        case '/': return(x/y); break;
        case '%': return(x%y); break;

        }
    }

===========================
File Name: Ext-jsfun-htmlpage.html

<head>
<script src="functions.js" type="text/javascript">
</script>
</head>
<body>
    <script>
    line1();
    res=clac(5, '*', 80);   // calling function
    document.write("<br/>Res="+ res);
    line('$', 50);
    document.write("<br/>ANs=" + clac(52, '/', 3));
    </script>

</body>

Output:

**********################***********

Res=400
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

ANs=17.333333333333332

JavaScript Function With Both Arguments And Rreturn Type

<head>
<script>
// Function With both Arguments and return type
    function clac(x, s, y) // called function
    {
        switch(s)
        {
        case '+': return(x+y); break;
        case '-': return(x-y); break;
        case '*': return(x*y); break;
        case '/': return(x/y); break;
        case '%': return(x%y); break;

        }
    }
</script>
</head>
<body>
    <script>
    line1();
    res=clac(5, '*', 80);   // calling function
    document.write("<br/>Res="+ res);
    line('$', 50);
    document.write("<br/>ANs=" + clac(52, '/', 3));
    </script>
</body>

output:

Res=400
ANs=17.333333333333332

JavaScript Function With Arguments and no Return Type

<head>
<script>
// Function With Arguments and no return type
    function line(s, n) // called function
    {
        document.write("<br/>");
        for(i=0; i<n; i++) {
            document.write(s);
        }
        document.write("<br/>");
    }
</script>
</head>
<body>
    <script>
    line('*', 80);   // calling function
    </script>
    <h2>Welcome to JS</h2>
    <script>
    line('$', 50);
    </script>
</body>

outpou:-

******************************************************

Welcome to JS

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

JavaScript Function With no Arguments and no Return Type

<head>
<script>
// Function With no Arguments and no return type
    function line() // called function
    {
        document.write("<br/>**********################***********<br/>");
    }
</script>
</head>
<body>
    <script>
    line();   // calling function
    </script>
    <h2>Welcome to JS</h2>
    <script>
    line();
    </script>
</body>

Output:

**********################***********

Welcome to JS

**********################***********

JavaScript Functions And Its Types

JavaScript Function: A function is used to group a set of statements then we can call no.of times any where in the project files. Functions are mainly used for re-usability.

Functions Are Mainly Two Types:

Pre Defined/ Bulletin Functions
User Defined/ Derived Functions

Pre Defined/ Bulletin Functions : Those functions which are defined by the system. We can use directly with out calling function definition.

Types of Pre Defined Functions:

Number Function
Math Functions
String Functions
Date and Time Functions
Input and Output Functions
Array Functions
DOM Functions

User Defined/ Derived Functions: Those functions which are defined by the User. We can use directly by calling function definition which is defined by user.

Types of User Defined Functions:

Function with no arguments and no return type
Function with arguments and no return type
Function with both arguments and with return type

Friday, September 27, 2013

JavaScript Multi-Dimensional Array With Example

Multi Dimensional Array:

Two/Multi-Dimensional Array is nothing but an Array in another Array

In an array each element is assigned with another array and so on....
i.e 2D Array, 3D Array, .....

Example:

<script>
var a = new Array(1234, "Kumar", "MGR", 35000);    // 1D Array
var b = new Array(1534, "Ravi", "Acc", 25000);     // 1D Array
var c = new Array(1643, "Hari", "HR", 15000);       // 1D Array
var emp = new Array(a, b, c); // 2D Arry

document.write("<br/>emp Array length: " + emp.length);

// To print All emp array elements
for(i=0; i<emp.length; i++)
{
    document.write("<br/>");
        for(j=0; j<emp[i].length; j++)
        document.write(emp[i][j] + "   ");
}

// To print All emp array elements in the Table
document.write('<table align="center" border="5" width="400" ><tr><th>E.No</th><th>EName</th><th>Job</th><th>Sal</th></tr>');

for(i=0; i<emp.length; i++)
{
    document.write("<tr>");
        for(j=0; j<emp[i].length; j++) {
        document.write("<td>"+ emp[i][j] + "</td>");
        }
    document.write("</tr>");
}

document.write("</table>");
</script>

Output:

emp Array length: 3
1234 Kumar MGR 35000
1534 Ravi Acc 25000
1643 Hari HR 15000

E.No	EName	Job	Sal
1234	Kumar	MGR	35000
1534	Ravi	Acc	25000
1643	Hari	HR	15000

Tuesday, September 10, 2013

JavaScript Associative Array WIth Example

JavaScript Associative Array: An array with Index/Keys as String. In Each array element we can store two values. In index one value and in array of index another value.

Example:
<script>

a=new Array(4);
a['rno']=1234;
a['name']="Raju";
a['job']="Manager";
a['sal']=35000;

document.write(a['name']); // Raju

// To Print All Associative Array Elements

for(i in a) {
document.write("<br/>" + i + " =========> " + a[i]);
}

</script>

output:

Raju
rno =========> 1234
name =========> Raju
job =========> Manager
sal =========> 35000

JavaScript Numeric Array With Example

JavaScript Numeric Array: An array with index/keys as sequence numbers.

Syntax1:
a = new Array(123, "hello", 78.96);

Syntax2:
a = new Array();
a[0]=123;
a[1]="hello";
a[2]=78.96;

document.write(a); // 123, hello, 78.96

To find Array Length:

document.write(a.length); // 3

To print all Array elements:

for(i=0; i<a.length; i++)
{
document.write("<br/>" + a[i] );
}

output:-
123
hello
78.96

JavaScript Arrays And Its Types

Array: In JavaScript an Array is a collection of Heterogeneous Elements. So all type of values can be store in one array.

There are 3 types of Arrays in Javascript:

1. Numeric Array

2. Associative Array

3. Multi-Dimensional Array

Tuesday, September 3, 2013

JavaScript Alert Function With Example

Alert() :- To display alert message in the dialogue.

Example for alert

<html>

<head>

</head>

<body>

a = 10;

alert('Value of a is ' + a);

</script>

</body>

</html>

Pages

Monday, September 30, 2013

Welcome to JS

Welcome to JS

Friday, September 27, 2013

Tuesday, September 10, 2013

Tuesday, September 3, 2013