How can I validate the age on a date input field? If someone is 18 or older, they will be valid. Otherwise, an error message should be displayed. Can you help me with this?
How can I validate the age on a date input field? If someone is 18 or older, they will be valid. Otherwise, an error message should be displayed. Can you help me with this?
This script takes a birthdate input and stores it in a constant variable called b18. It then adds 18 years to the birthdate and compares it with the current date to determine if the person is at least 18 years old.
// const b contains birth date to be tested
document.querySelector("input").addEventListener("input",function(){
const b=new Date(this.value);
const b18=new Date(b.getTime());
b18.setYear(b.getFullYear()+18);
// alternatively you could calculate that "critical birthdate",
// 18 years ago, that makes you an adult today:
const d18=new Date();
d18.setYear(d18.getFullYear()-18);
console.log(new Date()>b18,d18>b);
})<input type ="date" value="2003-08-29">Here is an example of how to achieve this:
<input id="age" type="number" />
let age = document.getElementById('age');
let minAge = 21;
age.onchange = () => {
if(!age.value >= minAge){
age.style.border = "1px solid red";
} else if(age.value >= minAge) {
age.style.border = "1px solid green";
}
}
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