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if...else Statement (JavaScript)

JavaScript - Internet Explorer 10

Conditionally executes a group of statements, depending on the value of an expression.

if (condition1) {
    statement1
}
[else if (condition2) {
    statement2
}]
[else {
    statement3] 
}]

Parameters

condition1: Required. A Boolean expression. If condition1 is null or undefined, condition1 is treated as false.
statement1: Optional. The statement to be executed if condition1 is true. Can be a compound statement.
condition2: The condition to be evaluated.
statement2: Optional. The statement to be executed if condition2 is true. Can be a compound statement.
statement3: If both condition1 and condition2 are false, this statement is executed.

Example

The following code shows how to use if, if else, and else.

It is good practice to enclose statement1 and statement2 in braces ({}) for clarity and to avoid inadvertent errors.

JavaScript

var z = 3;
if (x == 5) {
    z = 10;
}
else if (x == 10) {
    z = 15;
}
else {
    z = 20;
}

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Also supported in Windows Store apps. See Version Information.

Reference

Conditional (Ternary) Operator (?:) (JavaScript)

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