Calculate Age from Date of Birth

Good Morning,

I would like to have the field "appAge" be auto-calculated based on the date given in "appDOB" which has a mask of mm/dd/yyyy. I could use some help getting it to format

You can preview the form located at http://mwforms.miworksmo.org/wiareg.

I would like to know the best course of action to take with this, as I have been able to calculate the appropriate age with a simple PHP page, which the code looks like this for:

<?php
/**
 * Simple PHP age Calculator
 * 
 * Calculate and returns age based on the date provided by the user.
 * @param   date of birth('Format:mm-dd-yyyy').
 * @return  age based on date of birth
 */
function ageCalculator($dob){
	if(!empty($dob)){
		$birthdate = new DateTime($dob);
		$today   = new DateTime('today');
		$age = $birthdate->diff($today)->y;
		return $age;
	}else{
		return 0;
	}
}
$dob = '1975-12-22';
echo ageCalculator($dob);
?>

Because I am still learning this on the fly, I could use some help and recommendations...

Thank You.

Hi moorear,

I'm not clear - do you want to do this using JavaScript while the form is displayed? If so please see this StackOverFlow answer

In PHP after the form submits your code looks fine.

Bob

I would like the field to be set as soon as the appDOB changes, so that I can enable/disable other fields based on the age of the job seeker.

I am unsure how to put this into the form, where to put it, etc...

Hi moorear,

I just tested this and it seems to work OK. the getAge function is take exactly from the link I posted earlier. Here i have two inputs a datepicker with the id='appDOB' and a text input with the id='age'. You should probably set the age input to be readonly, and the datepicker to start in year view and block future dates.

jQuery(document).ready(function(jQ){
  jQ('#appDOB').on('change', function() {
    var age, dob;
    dob = jQ('#appDOB').val();
    age = getAge(dob);
    jQ('#age').val(age);
  });

  function getAge(dateString) {
    var today = new Date();
    var birthDate = new Date(dateString);
    var age = today.getFullYear() - birthDate.getFullYear();
    var m = today.getMonth() - birthDate.getMonth();
    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    return age;
}
});

Bob

Hi GreyHead,
I try to insert this script but it doesn't work😟 the text area "AGE" says Nan. why?

Hi ilsroma,

What is the format of the dates in your form? I suspect that may be the problem here as the script worked in my tests

Bob