Validate Age Field For Free

Types of Data Validation Data Type Check. A data type check confirms that the data entered has the correct data type. ... Code Check. A code check ensures that a field is selected from a valid list of values or follows certain formatting rules. ... Range Check. ... Format Check. ... Consistency Check. ... Uniqueness Check.

To validate if a string is a valid date input, you need to call the Date() constructor and pass the string as its argument. Note that the Date() constructor requires you to pass a date in the format of YYYY/MM/DD or MM/DD/YYYY . If you pass a date in DD/MM/YYYY format, the contructor also returns an Invalid Date .

HTML <div class="form-field form-field--birthdate"> <label for="birth-date">Birth Date (mm/dd/yyyy)</label> <input class="month" type="text" maxlength="2" name="birth_month" required> <input class="day" type="text" maxlength="2" name="birth_day" required>

JS $('.birthdate-click'). click(function(e) { e. preventDefault(); $month = $('.month'). val(); $day = $('.day'). val(); $year = $('.year'). val(); if (ageValidation(18, $month, $day, $year)) { alert('sorry not old enough'); } else alert('old enough');

Using onkeyup event of the textbox we can show the message " enter age between 1 to 100 " when entering age more than 100. If you use on keyup you will get the alert after each digit entered.

How to validate that user is 18 or older from date of birth? Based on the user birthday input we can calculate in JavaScript is this user 18 or older by using this function: function underAgeValidate(birthday){ // it will accept two types of format yyyy-mm-dd and yyyy/mm/dd var optimizedBirthday = birthday.

Inside the ?<script>? tag: Invoke the ready function as ?$(function ()?. Next, access the button with the help of its ?id? and attach the ?click? event using the ?on()? method. ... Check condition, if the age is greater than ?50? or less than ?1? it will invoke the ?alert()? method to show the alert box on the screen: