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JavaScript If …. Else Statement

Functions

The JavaScript if-else statement is used to execute the code whether

condition is true or false. There are three forms of if statement in JavaScript.

If Statement

If else statement

If else If statement

Explanation

If statement:

The if statement is the fundamental control statement that allows

JavaScript to make decisions and execute statements conditionally.

If else statement:

The 'if...else' statement is the next form of control statement that allows

JavaScript to execute statements in a more controlled way.

If...else If... statement:

The if...else if... statement is an advanced form of if…else that allows

JavaScript to make a correct decision out of several conditions.

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Tag

if statement:

if(Condition) {

Statement….; //Condition is true, Statement is executed

}

If else statement:

if(Condition) {

Statement….; //Condition is true, Statement is executed

}

else {

Statement…;//Condition is false, else statement is executed

}

if...else if... statement:

if (condition 1) {

statement…// Condition 1 is true, Statement is executed

}

Else if (condition 2) {

Statement…// Condition 2 is true, Statement is executed

}

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Else if (condition 3) {

Statement…// Condition 3 is true, Statement is executed

}

Else {

Statement..//No condition is true, this else statement is

executed

}

Sample Code (if statement)

if statement:

<html>

<body>

<script type="text/javascript">

var age=18;

if( age >15){

document.write("<b>Qualifies for Vote

in WikiTechy </b>");}

</script>

</body>

</html>

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If else statement:

<html>

<body>


var age=15;

if( age >18){

document.write("<b>Qualifies for Vote in WikiTechy </b>");

}

Else {

document.write("<b>Not Qualifies for Vote in WikiTechy </b>");

}

</script>

</body>

</html>

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Code Explanation:

if...else if... statement:

<html>

<body>


var book = "Datastructure";

if( book == "OOPS" ){

document.write("<b>OOPS Book</b>");

}

else if( book == "JAVA" ){

document.write("<b>JAVA Book</b>");

}

else if( book == "Datastructure" ){

document.write("<b>Datastructure Book</b>");

}

else{

document.write("<b>Unknown Book</b>");

} </script>

</body>

</html>

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Code Explanation

Age is Variable which is pass to if condition

document. Write which used to print the html data

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Age is Variable which is pass to if condition


document. Write in else condition is true to print the html data

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Book is Variable which is pass to if condition


Sample Output (if-statement)

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Sample Output (If Else):

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Sample Output (if Else if):

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Output:

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