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Thread: Age checker, neem to fill in day and month mandatory

  1. #1
    Join Date
    Aug 2010
    Location
    Tetouán, Morocco
    Posts
    8

    Question Age checker, neem to fill in day and month mandatory

    Hi there, Ive got the following problem:

    Code:
    Code:
    	<script language="javascript">
    		function checkAge()
    		{
    			/* the minumum age you want to allow in */
    			var min_age = 16;
    
    			/* change "age_form" to whatever your form has for a name="..." */
    			var year = parseInt(document.forms["age_form"]["year"].value);
    			var month = parseInt(document.forms["age_form"]["month"].value) - 1;
    			var day = parseInt(document.forms["age_form"]["day"].value);
    
    			var theirDate = new Date((year + min_age), month, day);
    			var today = new Date;
    			 
    			
    			if ( (today.getTime() - theirDate.getTime()) < 0) {
    				alert("Youre too young!");
    				return false;
    			}
    			else {
    				return true;
    			}
    		}
    	</script>
    This code above works, and when submitted the form, it checks the age for the minimum of 16. As you can see.

    Ive got a problem that it doesnt look at the days / month given.
    Default the list is set at a value of 00.

    I would like to add some additional JS code to check if the day and month have been given.
    If not given. An alert box popup with a message will be displayed.

    How would be that be achieved? Any advice is more than welcome since im a JS noob. Thanks!

  2. #2
    Join Date
    Dec 2005
    Location
    FL
    Posts
    7,389

    Lightbulb

    Try this change...
    Code:
    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="utf-8" />
    <title> Untitled </title>
    <script type="text/javascript">
    
    </script>
    
    <style type="text/css">
    
    </style>
    </head>
    <body>
    <form name="age_form" action="" method="post" onsubmit="return false">
     <select name="month" id="month"></select>
     <select name="day" id="day"></select>
     <select name="year" id="year"></select>
     <button onclick="checkAge()">Check Age</button>
    </form>
    
    <script type="text/javascript">
    function checkAge() {
    /* the minumum age you want to allow in */
      var min_age = 16;
    
    /* change "age_form" to whatever your form has for a name="..." */
      var year = parseInt(document.age_form.year.value);
      var month = parseInt(document.age_form.month.value) - 1;
      var day = parseInt(document.age_form.day.value);
    
      var theirDate = new Date((year + min_age), month, day);
      var today = new Date();
    			
      if ( (today - theirDate)< 0) {
        alert("You're too young!");
        return false;
      } else {
        return true;
      }
    }
    Array.prototype.applySelect = function(IDS) {
      var tarr = [];
      tarr.push('<option value="">'+this[0]+'</option>');
      for (var i=1; i<this.length; i++) {tarr.push('<option value="'+this[i]+'">'+this[i]+'</option>'); }
      document.getElementById(IDS).innerHTML = tarr.join('\n');
      return;
    }
    
    var now = new Date();
    window.onload = function() {
      ['Month','1','2','3','4','5','6','7','8','9','10','11','12'].applySelect('month');
      var tarr = [];
      tarr.push('Day');  for (var i=1; i<32; i++) { tarr[i] = i; }  
      tarr.applySelect('day');
      tarr = [];
      tarr.push('Year');  
      var yr = now.getFullYear();
      for (var i=0; i<21; i++) { tarr.push(yr-i); }  
      tarr.push((yr-21).toString()+' or before');
      tarr.applySelect('year');
    }
    </script>
    
    </body>
    </html>

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