How can I check someones age?

**decibel** · 02-01-2006 04:39 PM

Hi, using js validation, if a user enters a birth date with drop down boxes, how can i check to see if he is over 13 years old, thanks in advance.

these are my drop down boxed (php page)

PHP Code:


Enter Birth Date<br />

        <select name="user_bd_mon">

        <option value=''></option>

        <option value='1'>January</option>

        <option value='2'>February</option>

        <option value='3'>March</option>

        <option value='4l'>April</option>

        <option value='5'>May</option>

        <option value='6'>June</option>

        <option value='7'>July</option>

        <option value='8'>August</option>

        <option value='9'>September</option>

        <option value='10'>October</option>

        <option value='11'>November</option>

        <option value='12'>December</option>

        </select>&nbsp;

        <select name="user_bd_day">

        <option value=''></option>

        <?php for($d = 1; $d <= 31; $d++){ ?>

        <option value="<?php echo $d; ?>"><?php echo $d; ?></option>

        <?php } ?>

        </select>&nbsp;

            <select name="user_bd_year">

            <option value=''></option>

        <?php for($y = date("Y"); $y >= 1970; $y--){ ?>

        <option value="<?php echo $y; ?>"><?php echo $y; ?></option>

        <?php } ?>

        </select>

**Ultimater** · 02-01-2006 04:49 PM

Do a search for "age calculator javascript"
http://javascript.internet.com/math-...alculator.html
http://html_help4u.tripod.com/agecalc.html

**James Gatka** · 02-01-2006 06:32 PM

decibel:

Test this as a .php document. I did and it works in IE and Firefox.

Code:

<html>
<head>
<script type="text/javascript">
		
	var isToday = "";

	function setDateLimit(isForm,isList,nDays){
		
		var prevLimit = isForm[isList].length;
		var currLimit = nDays;
		if (currLimit < prevLimit)
			{isForm[isList].length = currLimit}
		else {
		      nOptions = currLimit-prevLimit
		      for (i=1; i<nOptions+1; i++)
			{
			 var isText = (prevLimit+i).toString();
			 insertDates(isForm[isList],isText,isText);
			}
		     }
		isForm[isList].selectedIndex = 0;
		checkLeap(isForm,isList);
	}
	
	function insertDates(isList,isValue,isText){

		var nOption = document.createElement('option'); 
		var isData = document.createTextNode(isText); 
		nOption.setAttribute('value',isValue); 
		nOption.appendChild(isData); 
		isList.appendChild(nOption); 
	}

	function checkLeap(isForm,isList){

		var isYear = isForm.startYears.value;
		if (isYear % 4 == 0 && isForm['startMonths'].value == '28')
			{
			 nOption = document.createElement('option'); 
			 isData = document.createTextNode('29'); 
			 nOption.setAttribute('value','29'); 
			 nOption.appendChild(isData); 
			 isForm[isList].appendChild(nOption);
			}
	}

	function resetBoth(isForm,isMonths,isDates){

		isForm[isMonths].selectedIndex = 0;
		isForm[isDates].options.length = 0;
		for (i=1; i<32; i++)
			{
			 insertDates(isForm[isDates],i,i)
			}
	}

	function clipDates(isForm,isMonth,isList){

		var nDates = isForm[isMonth].value;
		if (nDates == '30')
			{isForm[isList].options.length = 30}
		if (nDates == '28')
			{isForm[isList].options.length = 28}
		if (isForm.startYears.value % 4 == 0 && isForm[isMonth].value == '28')
			{
			 var nOption = document.createElement('option'); 
			 var isData = document.createTextNode('29'); 
			 nOption.setAttribute('value','29'); 
			 nOption.appendChild(isData); 
			 isForm[isList].appendChild(nOption); 
			}
	}

	function setUp(){

		isToday = new Date();
		var nStart = isToday.getMonth()+1+"/"+isToday.getDate()+"/"+isToday.getFullYear();
		var isStart = nStart.split("/");
		document.forms[0].startMonths.selectedIndex = isStart[0]-1;
		document.forms[0].startDates.selectedIndex = isStart[1]-1;
		var yearOffset = (1970-isStart[2])*-1;
		document.forms[0].startYears.selectedIndex = yearOffset;
		clipDates(document.forms[0],'startMonths','startDates');
		document.forms[0].birthDate.value = nStart;
	}

	function insertSlashDate(isForm){

		var startStr = isForm.startMonths.selectedIndex+1+"/";
		startStr += isForm.startDates.value+"/";
		startStr += isForm.startYears.value;
		startStr = startStr.replace(/^(\d{1}\/)/,"0$1").replace(/(\d{2}\/)(\d{1}\/)/,"$10$2")
		isForm.birthDate.value = startStr;
	}

	function validate(nForm){

		var birthDay = new Date(nForm.birthDate.value);
		var age = isToday.getFullYear()-birthDay.getFullYear();
		var currYrbDay = new Date(isToday.getFullYear(),birthDay.getMonth(),birthDay.getDate())
		if (currYrbDay > isToday && age > 0){age--}
		if (age < 13){alert('Access denied');return false}
		alert(nForm.birthDate.value);
	}

	onload=setUp;

</script>
</head>
<body>
<br>
<form onsubmit="return validate(this)">
<Table align='center' cellspacing='0' cellpadding='5' style='font-size:12pt;border:solid black 1px;background-color:lightyellow'>
<Thead><TH colspan='4' bgcolor='moccasin'> Submit your birthday </TH></Thead>

<td>
<?php

$months = array (0 => 'January','February','March','April','May','June','July','August','September','October','November','December');
$dayLimit = array('31','28','31','30','31','30','31','31','30','31','30','31'); 

?>
<select name='startMonths' onchange="setDateLimit(this.form,'startDates',this.value);insertSlashDate(this.form)">
<?php
foreach ($months as $key => $value) {
  echo "<option value='$dayLimit[$key]'>$value</option>\n";
}
?>
</select>
</td>

<td>
<? $days = range (1, 31) ?>
<select name='startDates' onchange="insertSlashDate(this.form)"> 
<?php 
foreach ($days as $value) {
  echo "<option value=\"$value\"> $value</option>\n";
}
?>
</select>
</td>

<td>
<?php $years = range (1970, 2010) ?>
<select name='startYears' onchange="resetBoth(this.form,'startMonths','startDates');insertSlashDate(this.form)"> 
<?php 
foreach ($years as $value) {
  echo "<option value=\"$value\"> $value</option>\n";
}
?>
</select>
</td>
</tr>
<tr>
<td colspan='3' align='middle'>
<input type='submit' value="Submit">
</td>
</tr>

</table>
<input type='hidden' name='birthDate'>
</form>

</body>
</html>

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