JavaScript If...Else Statement

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JavaScript If...Else Statement

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If...Else statement

Conditional statements in JavaScript are used to perform different actions based on different conditions.

Explanation

Conditional statements are used when you want something to happen when a condition is either true or false. You can either use the If or Switch conditional statements. Conditional statements are case sensitive and must be written in lowercase.

If statements are used when you want to check one condition

else if is added after the if statement and allows you to check for another condition.

else is added after the if and else if statement and allows you to do something when all previous conditions fail.

if statement

You should use the if statement if you want to execute some code only if a specified condition is true.

if (condition)
{
code to execute if condition true
}

Example:1

<script type="text/javascript"<

var name = "Vyom";

if (name = "Vyom")
{
document.write("Hello Rajesh");
}
</script<

Example:2

<script type="text/javascript">
//Write a "Good morning" greeting if
//the time is less than 10

var d=new Date()
var time=d.getHours()

if (time<10)
{
document.write("Good morning")
}
</script>

Example:3

<script type="text/javascript">
//Write "Lunch-time!" if the time is 11

var d=new Date()
var time=d.getHours()

if (time==11)
{
document.write("Lunch-time!")
}
</script>

You always use two equals signs(==) next to each other (==)!When we comparing variable .

Notice that there is no ..else.. in this syntax. You just tell the code to execute some code only if the specified condition is true.

If...else Statement

If else statement has the same format as of "if" statement. Only additional thing is that an else part is added to if statement. So if the conditions satisfies the statements inside if part will be executed else the statement inside else part will be executed.

Syntax of if..else statement

if (condition)
{
code to execute if condition true
}

Example:4

<script language="javascript">
var a = "1234abc";
if(a == "adcdefa")
{
document.write(" inside if statement ");
}
else
{
document.write(" inside else part of statement ");
}
</script>

Output

inside else part of statement

In the above example the condition is to check if variable 'a' equals (==) "abcdefa". The condition fails as we have assigned a as "1234abc". So the else part is executed.

Example:5

<script language="javascript">
//If the time is less than 10,
//you will get a "Good morning" greeting.
//Otherwise you will get a "Good day" greeting.

var d = new Date()
var time = d.getHours()

if (time < 10)
{
document.write("Good morning!")
}
else
{
document.write("Good day!")
}
</script>

If...else if...else Statement

You should use the if....else if...else statement if you want to select one of many sets of lines to execute.

Syntax

if (condition)
{
code to execute if condition true
}
else if (condition)
{
code to execute if 2nd condition true
}
else
{
code to execute if above are false
}

Example:6

<script language="javascript">
var name = "Mary";

if (name = "John"){
document.write("Hello John ");
}
else if (name = "Peter")
{
document.write("Hello Peter");
}
else {
document.write("Hello Stranger");
}
</script>

Say Hello John to John, Hello Peter to Peter and Hello Stranger to anyone else.

Example:7

<script language="javascript">
var d = new Date()
var time = d.getHours()
if (time<10)
{
document.write("Good morning")
}
else if (time>10 && time<16)
{
document.write("Good day")
}
else
{
document.write("Hello World!")
}
</script>

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Keywords: javascript tutorials, javascript code, javascript if else operators, javascript if else script type

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