JavaScript If…Else
JavaScript Tutorial » JavaScript If…Else
JavaScript Conditional Statements
There are several conditional statements in JavaScript
1. if statement,
2. if...else statement,
3. if...else if....else statement,
4. switch...case statement
if Statement - example
if statement is used to execute a block of code only if the specified condition is true.
// Code to be executed
}
<script>
var now = new Date();
var dayOfWeek = now.getDay(); // Sunday - Saturday : 0 - 6
if(dayOfWeek == 5) {
alert("Have a nice weekend!");
}
</script>
if...else Statement - example
if...else statement allows you to execute one block of code if the specified condition is evaluates to true and another block of code if it is evaluates to false.
// Code to be executed if condition is true
} else {
// Code to be executed if condition is false
}
<script>
var now = new Date();
var dayOfWeek = now.getDay(); // Sunday - Saturday : 0 - 6
if(dayOfWeek == 3) {
alert("Have a nice weekend!");
} else {
alert("Have a nice day!");
}
</script>
Have a nice day!
if...else if...else Statement, example
The if...else if...else a special statement that is used to combine multiple if...else statements.
// Code to be executed if condition1 is true
} else if(condition2) {
// Code to be executed if the condition1 is false and condition2 is true
} else {
// Code to be executed if both condition1 and condition2 are false
}
<script>
var now = new Date();
var dayOfWeek = now.getDay(); // Sunday - Saturday : 0 - 6
if(dayOfWeek == 5) {
alert("Have a nice weekend!");
} else if(dayOfWeek == 0) {
alert("Have a nice Sunday!");
} else {
alert("Have a nice day!");
}
</script>
JavaScript If…Else string contains, or, undefined, not null, and, not, checkbox is checked, has class, shortheand: online, if, example, ternary, condition, inline, alternative, break, ejemplo
JavaScript If…Else - javascript tutorial
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