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| 1 | +// Get the elements from the DOM |
| 2 | +const birthdayInput = document.getElementById("birthday"); |
| 3 | +const calculateButton = document.getElementById("calculate"); |
| 4 | +const resultElement = document.getElementById("result"); |
| 5 | + |
| 6 | +// Add click event listener to the calculate button |
| 7 | +calculateButton.addEventListener("click", calculateAge); |
| 8 | + |
| 9 | +// Function to calculate the age |
| 10 | + |
| 11 | +function calculateAge() { |
| 12 | + // Get the value from the input |
| 13 | + const birthday = birthdayInput.value; |
| 14 | + |
| 15 | + // Check if the value is empty |
| 16 | + if (birthday === "") { |
| 17 | + // If the value is empty, show an alert |
| 18 | + alert("Please enter your birthday"); |
| 19 | + } else { |
| 20 | + // If the value is not empty, calculate the age |
| 21 | + const age = getAge(birthday); |
| 22 | + |
| 23 | + // Show the result |
| 24 | + resultElement.innerHTML = `Your age is ${age} ${ |
| 25 | + age > 1 ? "years" : "year" // Check if the age is more than 1 |
| 26 | + } old`; |
| 27 | + } |
| 28 | +} |
| 29 | + |
| 30 | +// Function to calculate the age |
| 31 | +function getAge(birthDay) { |
| 32 | + // Get the current date |
| 33 | + const currentDate = new Date(); |
| 34 | + |
| 35 | + // Get the birthday date |
| 36 | + const birthdayDate = new Date(birthDay); |
| 37 | + |
| 38 | + // Calculate the age |
| 39 | + const age = currentDate.getFullYear() - birthdayDate.getFullYear(); |
| 40 | + |
| 41 | + const month = currentDate.getMonth() - birthdayDate.getMonth(); |
| 42 | + if ( |
| 43 | + month < 0 || |
| 44 | + (month === 0 && currentDate.getDate() < birthdayDate.getDate()) |
| 45 | + ) { |
| 46 | + age--; |
| 47 | + } |
| 48 | + |
| 49 | + // Return the age |
| 50 | + return age; |
| 51 | +} |
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