- JavaScript Basics
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- JS var Vs let Vs const
- JS Operators
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- JS Data Types
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- JS Conditional Statements
- JS Conditional Statement
- JS if Statement
- JS if...else Statement
- JS switch Statement
- JS Loops
- JS for Loop
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- JS do...while Loop
- JS break Statement
- JS continue Statement
- JS break Vs. continue
- JavaScript Popup Boxes
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- JavaScript Functions
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- JavaScript Events
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- JavaScript Arrays
- JS Array
- JS Find Length of Array
- JS Add Elements at Beginning
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- JS Remove First Element
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- JS Get First Index
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- JS Reverse an Array
- JS Sort an Array
- JS Concatenate Arrays
- JS join()
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- JS from()
- JS Check if Value Exists
- JS Check if Array
- JS Slice an Array
- JS splice()
- JS find()
- JS findIndex()
- JS entries()
- JS every()
- JS fill()
- JS filter()
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- JS map()
- JavaScript Strings
- JS String
- JS Length of String
- JS Convert to Lowercase
- JS Convert to Uppercase
- JS String Concatenation
- JS search()
- JS indexOf()
- JS search() Vs. indexOf()
- JS match()
- JS match() Vs. search()
- JS replace()
- JS toString()
- JS String()
- JS includes()
- JS substr()
- JS Slice String
- JS charAt()
- JS repeat()
- JS split()
- JS charCodeAt()
- JS fromCharCode()
- JS startsWith()
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- JS trim()
- JS lastIndexOf()
- JavaScript Objects
- JS Objects
- JS Boolean Object
- JavaScript Math/Number
- JS Math Object
- JS Math.abs()
- JS Math.max()
- JS Math.min()
- JS Math.pow()
- JS Math.sqrt()
- JS Math.cbrt()
- JS Math.round()
- JS Math.ceil()
- JS Math.floor()
- JS Math.trunc
- JS toFixed()
- JS toPrecision()
- JS Math.random()
- JS Math.sign()
- JS Number.isInteger()
- JS NaN
- JS Number()
- JS parseInt()
- JS parseFloat()
- JavaScript Date and Time
- JS Date and Time
- JS Date()
- JS getFullYear()
- JS getMonth()
- JS getDate()
- JS getDay()
- JS getHours()
- JS getMinutes()
- JS getSeconds()
- JS getMilliseconds()
- JS getTime()
- JS getUTCFullYear()
- JS getUTCMonth()
- JS getUTCDate()
- JS getUTCDay()
- JS getUTCHours()
- JS getUTCMinutes()
- JS getUTCSeconds()
- JS getUTCMilliseconds()
- JS toDateString()
- JS toLocaleDateString()
- JS toLocaleTimeString()
- JS toLocaleString()
- JS toUTCString()
- JS getTimezoneOffset()
- JS toISOString()
- JavaScript Browser Objects
- JS Browser Objects
- JS Window Object
- JS Navigator Object
- JS History Object
- JS Screen Object
- JS Location Object
- JavaScript Document Object
- JS Document Object Collection
- JS Document Object Properties
- JS Document Object Methods
- JS Document Object with Forms
- JavaScript DOM
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- JS DOM Nodes
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- JavaScript Regular Expression
- JS Regular Expression
- JS RegEx .
- JS RegEx \w and \W
- JS RegEx \d and \D
- JS RegEx \s and \S
- JS RegEx \b and \B
- JS RegEx \0
- JS RegEx \n
- JS RegEx \xxx
- JS RegEx \xdd
- JS RegEx Quantifiers
- JS RegEx test()
- JS RegEx lastIndex
- JS RegEx source
- JavaScript Advance
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- JS Form Validation
- JS Validations
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- JS try-catch throw finally
- JS onerror Event
- JS Multimedia
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- JS Image Map
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- JS innerHTML
- JS getElementById()
- JS getElementsByClassName()
- JS getElementsByName()
- JS getElementsByTagName()
- JS querySelector()
- JS querySelectorAll()
- JS document.write()
- JS console.log()
- JS instanceof
- JavaScript Programs
- JavaScript Programs
JavaScript Conditional Statements
Conditional (decision making) statements in JavaScript, are used to perform action based on the condition. For example:
HTML with JavaScript Code
<!DOCTYPE html> <html> <body> <p id="xyz"></p> <script> let x = 10; if(x%2 == 0) document.getElementById("xyz").innerHTML = "Even number"; else document.getElementById("xyz").innerHTML = "Odd number"; </script> </body> </html>
Output
That is, in above example, if the condition x%2 == 0 evaluates to be true, then the statement of if block will be executed, otherwise the statement of else block will be executed.
List of Conditional Statements in JavaScript
JavaScript Conditional Statements Example
HTML with JavaScript Code
<!DOCTYPE html> <html> <body> <button onclick="greet()">Greeting</button> <p id="myPara"></p> <script> function greet() { let tn, g; tn = new Date().getHours(); if(tn<9 && tn>4) g = "Good Morning"; else if(tn>15 && tn<21) g = "Good Evening"; else g = "Have a Good Day"; document.getElementById("myPara").innerHTML = g; } </script> </body> </html>
Output
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